Civil Engineering Concrete Technology Quiz (or) MCQ

1 .

What is Concrete Technology?

A)

Concrete Technology deals with the study of bricks

B)

Concrete Technology is the study of building materials

C)

Concrete Technology deals with the study of properties of concrete

D)

None of the above

Correct Answer : Concrete Technology deals with the study of properties of concrete

Explanation : Concrete Technology is concerned with the study of concrete characteristics and their practical applications. Concrete is most often utilized as the foundation for most projects in the construction sector.

2 .

Who is the father of concrete technology?

A)

Joseph Aspdin

B)

William Aspdin

C)

Royston Saint John

D)

None of the above

Correct Answer : William Aspdin

Explanation : William Aspdin (September 23, 1815 – April 11, 1864), a pioneer of the Portland cement industry, was an English cement maker.

He is often credited with inventing “modern” Portland cement. His father Joseph Aspdin has patented the method of cement manufacturing.

3 .

What is concrete?

A)

A mixture of homogenous materials

B)

A mixture of material and hydrogen

C)

A mixture of cement and hydrogen sulphide

D)

A mixture of cement, water, and aggregates

Correct Answer : A mixture of cement, water, and aggregates

Explanation : Concrete is a hardening building material made up of cement, fine aggregates (sand), and coarse aggregates combined with water. It is a significant building material that is utilized widely in the construction of buildings, bridges, highways, and dams.

4 .

For the construction of the retaining structures, the type of concrete mix to be used, is_______.

A)

1 : 2 :4

B)

1 : 3 : 6

C)

1 : 4 : 8

D)

1 : 1 1/2 : 3

Correct Answer : 1 : 1 1/2 : 3

5 .

An ideal ware house, is provided________.

A)

water proof roof

B)

water proof masonry walls

C)

few windows which remain generally closed

D)

All of the above

Correct Answer : All of the above

Explanation : * water proof roof
* water proof masonry walls
* few windows which remain generally closed
* 15 cm thick concrete floor laid on a dry course of soling

6 .

If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is,____

A)

25%

B)

30%

C)

35%

D)

40%

Correct Answer : 25%

7 .

Why concrete technology is needed?

A)

Concrete technology is needed to address properties of concrete

B)

Concrete technology is needed to build a building

C)

Concrete technology is needed to produce building materials

D)

None of the above

Correct Answer : Concrete technology is needed to address properties of concrete

Explanation : Concrete technology covers all elements of concrete, from mix design to batching, mixing, transporting, putting, consolidating, finishing, and curing, and gives guidance on all aspects of concrete from mix design to batching, mixing, transporting, placing, consolidating, finishing, and curing.

8 .

The aggregate containing moisture in pores and having its suface dry, is known as______.

A)

dry aggregates

B)

moist aggregates

C)

saturated surface dry aggregate

D)

very dry aggregates

Correct Answer : saturated surface dry aggregate

9 .

To hydrate 500kg of cement full water needed, is____.

A)

140 kg

B)

130 kg

C)

120 kg

D)

110 kg

Correct Answer : 130 kg

10 .

Separation of coarse aggregates from mortar during transportation, is known____.

A)

shrinkage

B)

creeping

C)

segregation

D)

bleeding

Correct Answer : segregation

11 .

Concrete technology is useful for civil engineers because it allows them to ________

A)

conduct various concrete tests

B)

know how to appropriately stock the materials needed for concrete

C)

familiarise them with the fundamental principles of concrete

D)

All of the above

Correct Answer : All of the above

Explanation : Concrete technology in civil engineering helps to know how to appropriately stock the materials needed for concrete, conduct various concrete tests and familiarise them with the fundamental principles of concrete.

12 .

Which type of concrete is classified based on the design of concrete?

A)

Plain Cement Concrete

B)

Reinforced Cement Concrete

C)

Pre-stressed Concrete

D)

All of the above

Correct Answer : All of the above

Explanation : There are Three Types of Classification based on the design of concrete :

* Plain Cement Concrete
* Reinforced Cement Concrete
* Pre-stressed Concrete

13 .

What are Plasticizers?

A)

Which reduces water for workability

B)

Which oxidizes water for workability

C)

Which adds water for workability

D)

Which decreases workability at the same water content

Correct Answer : Which reduces water for workability

Explanation : Organic compounds, or mixtures of organic and inorganic chemicals, that allow for a lower water content for given workability, or provide better workability for the same water content.

14 .

Which of the following is used to test the Standard consistency of cement?

A)

Soundness meter

B)

Vicat apparatus

C)

Duff Abrams apparatus

D)

Le Chatalier apparatus

Correct Answer : Vicat apparatus

Explanation : The standard consistency of a cement paste is described as that which allows the vicat’s plunger to penetrate to a depth of 5 to 7mm from the vicat mould’s bottom.

15 .

According to IS : 382-1963, a good aggregate should be_______.

A)

hard and durable

B)

chemically inert

C)

sufficiently strong

D)

All of the above

Correct Answer : All of the above

16 .

The 28 days cube strength of mass concrete using aggregates of maximum size 5 cm for gravity dams should be

A)

below 200 kg/cmÂ²

B)

between 150 to 300 kg/cmÂ²

C)

between 150 to 500 kg/cmÂ²

D)

between 350 to 600 kg/cmÂ²

Correct Answer : below 200 kg/cmÂ²

17 .

Under normal conditions using an ordinary cement, the period of removal of the form work, is :

A)

7 days for beam soffits

B)

14 days for bottom slabs of spans 4.6 m and more

C)

21 days for bottom beams over 6 m spans

D)

All of the above

Correct Answer : All of the above

Explanation : * 7 days for beam soffits
* 14 days for bottom slabs of spans 4.6 m and more
* 21 days for bottom beams over 6 m spans
* 2 days for vertical sides of columns

18 .

How many basic types of concrete are there?

A)

24 types

B)

22 types

C)

21 types

D)

20 types

Correct Answer : 24 types

Explanation : Depending on the kind of construction, there are typically twenty-four distinct types of concrete used in the building and construction business.

19 .

What is the full form of HRM in concrete technology?

A)

Human Reserve Management

B)

Human Resource Management

C)

Humidity and Resource Management

D)

None of the above

Correct Answer : Human Resource Management

Explanation : In concrete technology, HRM is abbreviated as Human Resource Management.

20 .

What are the ingredients of concrete?

A)

Admixtures

B)

Fine aggregate

C)

Binding material

D)

All of the above

Correct Answer : Binding material

Explanation : The binding material binds fine and coarse aggregate. Fine aggregates fill the space in the coarse aggregate. Admixtures affect the setting time of cement.

21 .

The commercial name of white and coloured cement in India, is______.

A)

snowcem

B)

colocrete

C)

rainbow cement

D)

All of the above

Correct Answer : All of the above

22 .

According to the recommendations of IS : 456-1978, the expansion joints

A)

are provided where plane changes abruptly

B)

are supported on separate columns

C)

are provided to ensure minimum resistance

D)

All of the above

Correct Answer : All of the above

Explanation : * are provided where plane changes abruptly
* are supported on separate columns
* are provided to ensure minimum resistance
* do not carry reinforcement across them

23 .

High strength concrete is defined purely on the basis of __________.

A)

Compressive strength

B)

Tensile strength

C)

Poor Aggregrates

D)

Good Aggregrates

Correct Answer : Compressive strength

Explanation : High strength concrete is defined purely on the basis of its compressive strengths.

24 .

What happens when chalk is used?

A)

It must be sieved and fed into a rotating dish known as a granulator

B)

It must be finely broken up and dispersed in water in a wash mill

C)

It must be blasted, then crushed, usually in two smaller crushers

D)

Crushed raw materials are put into a grinding mill, where they are dried and reduced to a fine powder

Correct Answer : It must be finely broken up and dispersed in water in a wash mill

Explanation : Chalk is finely broken up and disseminated in water in a wash mill when it is utilized. In a similar manner, the clay is broken up and combined with water, usually in a wash mill.

25 .

Concrete is unsuitable for compaction by a vibrator if it is

A)

dry

B)

plastic

C)

earth moist

D)

semi-plastic

Correct Answer : plastic

26 .

Inert material of a cement concrete mix, is_____.

A)

water

B)

cement

C)

aggregate

D)

None of the above

Correct Answer : aggregate

27 .

If P, Y and Z are the weights of cement, fine aggregates and coarse aggregates respetively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch, is obtained by the equation_______.

A)

0.5P + 0.3Y + 0.01Z = W/C x P

B)

0.4P + 0.2Y + 0.01Z = W/C x P

C)

0.3P + 0.1Y + 0.01Z = W/C x P

D)

0.1P + 0.3Y + 0.1Z = W/C x P

Correct Answer : 0.3P + 0.1Y + 0.01Z = W/C x P

28 .

For the construction of thin R.C.C. structures, the type of cement to be avoided, is__________.

A)

blast furnace slag cement

B)

rapid hardening cement

C)

ordinary Portland cement

D)

sulphate resisting cement

Correct Answer : blast furnace slag cement

29 .

For given water content, workability decreases if the concrete aggregates contain an excess of

A)

thin particles

B)

flat particles

C)

flaky paticles

D)

All of the above

Correct Answer : All of the above

Explanation : * thin particles
* flat particles
* flaky paticles
* elongated particles

30 .

What is the objective of concrete technology?

A)

To find the material strength

B)

Calculate the amount of cement required

C)

To define and understand concepts related to Cement

D)

To define and understand concepts related to Concrete technology

Correct Answer : To define and understand concepts related to Concrete technology

Explanation : To identify and comprehend ideas connected to concrete technology, which includes the various types and properties of concrete as well as various adhesive materials and their critical application in the construction of safe and cost-effective structures.

31 .

For a compressive strength of 3000 psi, the lightweight cement content is ____ pounds per cubic yard.

A)

730-750

B)

440-560

C)

430-560

D)

400-590

Correct Answer : 440-560

Explanation : Compressive strengths of 3000 psi requires 440-560 pounds per cubic yard, while compressive strengths of 2500 psi requires 400-510 pounds per cubic yard.

32 .

Pick up the correct statement from the following :

A)

Angular and rough aggregates reduce the workability of the concrete

B)

Large size aggregates increase the workability due to lesser surface area

C)

The slump of the concrete mix decreases due to an increase in temperature

D)

All of the above

Correct Answer : All of the above

Explanation : * Angular and rough aggregates reduce the workability of the concrete
* Large size aggregates increase the workability due to lesser surface area
* The slump of the concrete mix decreases due to an increase in temperature
* An increase in water content must be accompanied by an increase in cement content

33 .

Grading of sand causes great variation in______.

A)

strength of concrete

B)

durability of concrete

C)

workability of concrete

D)

All of the above

Correct Answer : All of the above

Explanation : * strength of concrete
* durability of concrete
* workability of concrete
* handing and placing of concrete

34 .

For a compressive strength of 4000 psi, the light weight cement content is ________ pounds per cubic yard.

A)

740-840

B)

630-750

C)

530-660

D)

440-560

Correct Answer : 530-660

Explanation : The lightweight cement content for compressive strengths is 4000 psi is 530-660 pounds per cubic yard, whereas compressive strengths of 2500 psi are 400-510 pounds per cubic yard.

35 .

Which of the following is not a type of Non-destructive testing?

A)

Ultrasonic test

B)

Visual testing

C)

Compression testing

D)

Eddy current testing

Correct Answer : Ultrasonic test

Explanation : Destructive testing, such as compression testing, is a sort of destructive testing. This test is performed to assess how metals react when compressed. Non-destructive testing includes methods such as visual inspection, ultrasonic inspection, and eddy current testing.

36 .

Sands of zone I are________.

A)

fine

B)

coarse

C)

medium

D)

medium to fine

Correct Answer : coarse

37 .

Vicat apparatus is used for

A)

fineness test

B)

consistency test

C)

test for setting time

D)

test for tensile strength

Correct Answer : consistency test

38 .

M10 grade of concrete approximates________.

A)

1 : 3 : 6 mix

B)

1 : 1 : 2 mix

C)

1 : 2 : 4 mix

D)

1 : 1.5 : 3 mix

Correct Answer : 1 : 3 : 6 mix

39 .

For ensuring quality of concrete, use_________

A)

coarse aggregates

B)

two sized aggregate

C)

graded aggregates

D)

single sized aggegates

Correct Answer : graded aggregates

40 .

What is the importance of the Standard Consistency Test?

A)

It is used to determine the quality of cement

B)

It is used to determine the quality of aggregates

C)

It is used to determine the quality of water

D)

None of the above

Correct Answer : It is used to determine the quality of water

Explanation : This test is used to assess how much water is needed to make a standard or typical consistency cement paste. This test also helps to determine soundness, compressive strengths and setting time of the cement.

41 .

Hydration of cement is chemical reaction of cement with __________.

A)

water

B)

base

C)

acid

D)

salt and acid

Correct Answer : water

Explanation : As water comes into contact with cement particles, hydration reactions immediately starts at the surface of the particles. It is an exothermic reaction i.e., heat is released during the process. The resultant product of this reaction is hardened cement.

42 .

For the construction of R.C.C. slabs, columns, beams, walls, etc. the grade of concrete mix used, is____.

A)

1 : 1 : 2

B)

1 : 2 : 4

C)

1 : 3 : 6

D)

1 : 4 : 8

Correct Answer : 1 : 2 : 4

43 .

The type of aggregates of same nominal size, which contain less voids when compacted, are________.

A)

flaky

B)

irregular

C)

rounded spherical

D)

None of the above

Correct Answer : rounded spherical

44 .

Shrinkage in concrete can be reduced by using______.

A)

proper concrete mix

B)

low water cement ratio

C)

less cement in the concrete

D)

All of the above

Correct Answer : All of the above

Explanation : * proper concrete mix
* low water cement ratio
* less cement in the concrete
* presaturated aggregates

45 .

Ordinary concrete is not used for concrete grade

A)

M 150

B)

M 200

C)

M 250

D)

M 400

Correct Answer : M 400

46 .

Which of the following region absorbs less radiation and transmits more during radiography test for concrete?

A)

High density region

B)

Low density region

C)

Low and high density regions adsorb

D)

Low and high density regions absorb and transmit same amount of radiation

Correct Answer : Low density region

Explanation : In radiography test internal flaws are detected using short wavelength electromagnetic radiations such as X-rays and rays. The component to be tested is put in the direction of radiations generated by X-rays or rays in this approach.

47 .

Which of the following property of a substance that resists abrasion or scratching that causes penetration or indentation?

A)

Hardness

B)

Strength

C)

Toughness

D)

Stiffness

Correct Answer : Hardness

Explanation : Hardness is the property of a material that resists penetration or indentation by abrasion or scratching.

48 .

The lower water cement ratio in concrete, introduces_______.

A)

improved frost resistance

B)

smaller creep and shrinkage

C)

greater density and smaller permeability

D)

All of the above

Correct Answer : All of the above

Explanation : * improved frost resistance
* smaller creep and shrinkage
* greater density and smaller permeability
* greater wear resistance and improved bond strength

49 .

The cement becomes useless if its absorbed moisture content exceeds____.

A)

3%

B)

4%

C)

5%

D)

None of the above

Correct Answer : 5%

50 .

Pick up the incorrect statement from the following :

A)

Tricalcium silicate (Câ‚ƒS) hydrates rapidly

B)

Tricalcium silicate (Câ‚ƒS) develops early strength

C)

Tricalcium silicate (Câ‚ƒS) generates more heat of hydration

D)

Tricalcium silicate (Câ‚ƒS) has more resistance to sulphate attack

Correct Answer : Tricalcium silicate (Câ‚ƒS) has more resistance to sulphate attack

51 .

Permissible compressive strength of M 200 concrete grade is________.

A)

250 kg/cmÂ²

B)

200 kg/cmÂ²

C)

150 kg/cmÂ²

D)

100 kg/cmÂ²

Correct Answer : 200 kg/cmÂ²

52 .

According to I.S. : 456, the number of grades of concrete mixes, is_____.

A)

7

B)

6

C)

5

D)

4

Correct Answer : 7

53 .

The mixture of different ingredients of cement, is burnt at_______.

A)

1000Â°C

B)

1200Â°C

C)

1400Â°C

D)

1600Â°C

Correct Answer : 1400Â°C

54 .

Which of the following cement is used in sewage and water treatment plants?

A)

Low Heat Cement

B)

Quick Setting Cement

C)

Sulphate Resisting Cement

D)

Rapid Hardening Cement

Correct Answer : Sulphate Resisting Cement

Explanation : Sulphate resistance is excellent in cement with composition. This type of cement is utilized in the construction of foundations on soils with high sulphate levels in the subsoil.

55 .

Which of the following cement is used for interior and exterior decorative works?

A)

Low Heat Cement

B)

Colored Cement

C)

High Alumina Cement

D)

Rapid Hardening Cement

Correct Answer : Colored Cement

Explanation : Colored cement is made by mixing 5-10% mineral pigments into Portland cement during the grinding process. The color added to the cement can fade but the cement retains its workability and durability.

56 .

For the construction of cement con-certe dams, the maximum permissible size of the aggregates, is____.

A)

40 mm

B)

50 mm

C)

60 mm

D)

70 mm

Correct Answer : 40 mm

57 .

1.S. Sieve Nos. 10 mm and 4.75 mm are geneally used for grading of_______.

A)

fine aggregates

B)

coarse aggregates

C)

Both (A) and (B)

D)

Neither (A) nor (B)

Correct Answer : Both (A) and (B)

58 .

Addition of pozzolana to ordinary port land cement, causes________.

A)

increase in shrinkage

B)

reduction bleeding

C)

decrease in early strength

D)

All of the above

Correct Answer : All of the above

Explanation : * increase in shrinkage
* reduction bleeding
* decrease in early strength
* reduction in chemical action with sulphates

59 .

Too wet concrete may cause________.

A)

segregation

B)

lower density

C)

weakness of concrete

D)

All of the above

Correct Answer : All of the above

60 .

Which of the following is a discontinuity that occurs during the casting of molten metal and is caused by splashing, surging, or interrupted pouring?

A)

Burst

B)

Cold shut

C)

Flaking

D)

Blow hole

Correct Answer : Cold shut

Explanation : Cold shut refers to a discontinuity in molten metal casting that can be generated by splashing, surging, halted pouring, or the meeting of two streams of metal coming from separate directions.

61 .

Which of the following stress can Plain cement concrete endure?

A)

Shear stress

B)

Tensile stress

C)

Compressive stress

D)

Tensile, compressive, and shear stresses

Correct Answer : Compressive stress

Explanation : Plain cement concrete is strong in taking compressive stress but weak in tensile stress. It consists of water, cement, coarse aggregate, and fine aggregate.

62 .

Placing of concrete should preferably be done at a temperature of_______.

A)

10Â°C

B)

20Â°C

C)

23Â°C

D)

27 Â± 2Â°C

Correct Answer : 27 Â± 2Â°C

63 .

The aggregate impact value of the aggregate used in_______.

A)

road pavement concrete is less than 30

B)

runway concrete is less than 30

C)

building concrete is less than 45

D)

All of the above

Correct Answer : All of the above

64 .

In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for______.

A)

25 times

B)

30 times

C)

40 times

D)

50 times

Correct Answer : 25 times

65 .

If the average compressive strength is 4000 kg/cmÂ² and standard deviation is 500, the co-efficient of variation is_____.

A)

10%

B)

12.5%

C)

15%

D)

18.5%

Correct Answer : 12.5%

66 .

For preparing ordinary concrete, the quantity of water used, is________.

A)

5% by weight of aggregates plus 20% of weight of cement

B)

10% by weight of aggregates plus 10% of weight of cement

C)

5% by weight of aggregates plus 30% of weight of cement

D)

30% by weight of aggregates plus 10% of weight of cement

Correct Answer : 5% by weight of aggregates plus 30% of weight of cement

67 .

The risk of segregation is more for__________.

A)

wetter mix

B)

coarser grading

C)

larger proportion of maximum size aggregate

D)

All of the above

Correct Answer : All of the above

68 .

After casting, an ordinary cement concrete on drying______.

A)

mix

B)

shrinks

C)

expands

D)

None of the above

Correct Answer : shrinks

69 .

Which of the following ratio is also known as water-cement ratio?

A)

Weight of water to the weight of cement

B)

Weight of water to the weight of aggregates

C)

Volume of cement to the volume of cement

D)

Density of cement to the Density of cement

Correct Answer : Weight of water to the weight of cement

Explanation : The water–cement ratio is the weight of water in a concrete mix divided by the weight of cement. The strength of concrete is proportional to the Cement water ratio and inversely proportional to the w/c ratio.

70 .

How many layers of concrete are needed to fill a slump cone?

A)

3 equal layers by volume

B)

3 equal layers by height

C)

5 layers

D)

5 layers by volume

Correct Answer : 3 equal layers by volume

Explanation : 3 equal layers by volume are placed. Fill the mold to a height of 12 inches in the shape of a frustum of a cone with a bottom diameter of 8 inches and a top diameter of 4 inches. Then, instead of filling it in three equal levels by height, fill it in three equal layers by volume.

71 .

For preparing a test-specimen, it is necessary_________.

A)

to mix coarse aggregates

B)

to mix cement and fine aggregate by dry hand

C)

to mix water to the cement, fine aggregates and coarse aggregates

D)

All of the above

Correct Answer : All of the above

Explanation : * to mix coarse aggregates
* to mix cement and fine aggregate by dry hand
* to mix water to the cement, fine aggregates and coarse aggregates
* to oil inner surface of the mould and the base plate, before placing concrete

72 .

Addition of pozzolana to cement causes_________.

A)

reduction in bleeding

B)

reduction in permeability

C)

loss of heat of hydration

D)

All of the above

Correct Answer : All of the above

Explanation : * reduction in bleeding
* reduction in permeability
* loss of heat of hydration
* increase in curing time

73 .

You are asked to construct a massive dam, the type of cement you will use, is__________.

A)

white cement

B)

blast furnace slag cement

C)

low heat cement

D)

ordinary Portland cement

Correct Answer : low heat cement

74 .

What is equivalent flexural strength?

A)

The value of mean equivalent flexural strength adjusted to mean flexural strength

B)

The stress value produced when Pe,n is utilized in the equation of modulus of rupture to represent the average flexural strength in the post-peak zone up to a specific deflection of L/n

C)

The stress is derived when the peak load value is included in the rupture modulus equation

D)

The load value, which represents the average load-carrying capacity in the post-peak region up to a deflection of L/n

Correct Answer : The stress value produced when Pe,n is utilized in the equation of modulus of rupture to represent the average flexural strength in the post-peak zone up to a specific deflection of L/n

Explanation : Equivalent flexural strength is the stress value that represents the average flexural strength in the post-peak zone up to a certain deflection of L/n obtained when Pe,n is employed in the equation of modulus of rupture.

75 .

A)

Inversely proportional

B)

Equal

C)

Similar

D)

Directly proportional

Correct Answer : Inversely proportional

Explanation : Creep increases as the cement ratio rises. In other words, it’s possible to say that creep is inversely related to concrete strength.

76 .

The maximum percentage of chemical ingredient of cement is that of______.

A)

lime

B)

aluminium

C)

silica

D)

magnesium oxide

Correct Answer : lime

77 .

Sand generally contains salt if it is obtained from :

A)

nala beds

B)

sea beds

C)

river beds

D)

All of the above

Correct Answer : sea beds

78 .

The impurity of mixing water which affects the setting time and strength of concrete, is______.

A)

calcium chorides

B)

sodium sulphates

C)

calcium bicarbonates

D)

sodium carbonates and bicarbonates

Correct Answer : sodium carbonates and bicarbonates

79 .

Di-calcium silicate (Câ‚‚S)

A)

hardens rapidly

B)

hydrates rapidly

C)

generates less heat of hydration

D)

provides less ultimate strength to cement

Correct Answer : generates less heat of hydration

80 .

The dimensions of a 35 litre forma for measuring aggregates by volume, are :

A)

length 30 cm, breadth 25 cm, height 30 cm

B)

length 27 cm, breadth 27 cm, height 48 cm

C)

length 39 cm, breadth 25 cm, height 32 cm

D)

length 220 cm, breadth 25 cm, height 40 cm

Correct Answer : length 27 cm, breadth 27 cm, height 48 cm

81 .

The shuttering of a hall measuring 4 m x 5 m, can be removed after_______.

A)

5 days

B)

7 days

C)

10 days

D)

14 days

Correct Answer : 7 days

82 .

Hydration of cement is due to chemical action of water with_________.

A)

Tricalcium silicate and dicalcium silicate

B)

Dicalcium silicate and tricalcium aluminate

C)

Tricalcium aluminate and tricalcium alumino ferrite

D)

All of the above

Correct Answer : All of the above

83 .

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between________.

A)

1400Â° and 1500Â°C

B)

1300Â° and 1400Â°C

C)

1200Â° and 1300Â°C

D)

1100Â° and 1200Â°C

Correct Answer : 1400Â° and 1500Â°C

84 .

What is the total percentage of aggregates in concrete in terms of volume?

A)

60-75%

B)

65-80%

C)

90%

D)

40%

Correct Answer : 60-75%

Explanation : Aggregates are split into two groups, accounting for 60-75 percent of the total volume of concrete. Gravels, crushed stone, Natural gravel, and sand, etc. are the aggregates of the concrete.

85 .

Crushed stone, gravel, and ordinary sand are examples of which type of cement aggregate?

A)

Normal-weight aggregate

B)

Lightweight aggregate

C)

Heavy-weight aggregate

D)

Both Normal-weight and Heavy-weight aggregate

Correct Answer : Normal-weight aggregate

Explanation : Normal weight aggregates include crushed stone, gravel, and regular sand. They’re widely utilized in the production of regular and asphalt concrete, and highway sub-base.

86 .

For concreting tunnel linings, tran-portation of concrete is done by_______.

A)

pans

B)

pumps

C)

containers

D)

wheel borrows

Correct Answer : pumps

87 .

The operation of removing humps and hollows of uniform concrete surface, is known as_______.

A)

floating

B)

screeding

C)

finishing

D)

trowelling

Correct Answer : screeding

88 .

The produce impermeable concrete_________.

A)

thorough mixing of concrete is required

B)

proper compaction of concrete is required

C)

proper curing of concrete is required

D)

All of the above

Correct Answer : All of the above

Explanation : * thorough mixing of concrete is required
* proper compaction of concrete is required
* proper curing of concrete is required
* properly graded and non-porous aggregates are requied

89 .

Water required per bag of cement, is_____

A)

21 kg

B)

28 kg

C)

35 kg

D)

60 kg

Correct Answer : 35 kg

90 .

For construction of structures in sea water, the cement generally preferred to, is__________.

A)

Portland-pozzolana cement

B)

quick setting cement

C)

rapid hardening cement

D)

low heat Portland cement

Correct Answer : Portland-pozzolana cement

91 .

The form work is usually removed after ________ for walls, columns, and the vertical faces of all structural components.

A)

72 hours

B)

56 hours

C)

24 hours

D)

24 to 48 hours

Correct Answer : 24 to 48 hours

Explanation : In all circumstances, 3/7 of the aforesaid period will suffice for rapid hardening cement, with the exception of vertical sides of slabs, beams, and columns, which should be held for 24 hours.

92 .

Which of the following increases the workability of concrete?

A)

Increasing fine aggregates

B)

Increasing size of aggregates

C)

Increasing flaky aggregates

D)

Decreasing size of aggregates

Correct Answer : Increasing size of aggregates

Explanation : Workability should be obtained by the use of a well-graded aggregate that has the largest maximum particle size possible. Along with aggregate admixtures and air entrainment also increases the workability.

93 .

On a grading curve, the gap grading is represented by_________.

A)

a vertical line

B)

N.W. inclined line

C)

a horizontal line

D)

N.E. inclined line

Correct Answer : a horizontal line

94 .

Bulking of sand is_________.

A)

mixing of lime with sand

B)

swelling of sand when wetted

C)

maximum water with sand

D)

mixing of different sizes of sand particles

Correct Answer : swelling of sand when wetted

95 .

If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is_______.

A)

15 kg

B)

14 kg

C)

12 kg

D)

10 kg

Correct Answer : 12 kg

96 .

The entrained air in concrete________.

A)

increases workability

B)

increases strength

C)

decreases workability

D)

decreases resistance to weathering

Correct Answer : increases workability

97 .

The standard sand now a days used in India, is obtained from_______.

A)

Jullundur (Punjab)

B)

Jaipur (Rajasthan)

C)

Vijayawada (Andhra Pradesh)

D)

Ennore (Madras)

Correct Answer : Ennore (Madras)

98 .

The maximum amount of dust which may be permitted in aggregates is___________.

A)

5% of the total aggregates for low workability with a coarse grading

B)

10% of the total aggregates for low workability with a fine grading

C)

20% of the total aggregates for a mix having high workability with fine grading

D)

All of the above

Correct Answer : All of the above

99 .

What is the relation between the Coefficient of thermal expansion of concrete and the coefficient of thermal expansion in aggregates?

A)

Equal

B)

Directly proportional

C)

More than

D)

Inversely proportional

Correct Answer : Directly proportional

Explanation : The coefficient of thermal expansion refers to either expansion or contraction of a material with temperature. The coefficient of thermal expansion rises in tandem with aggregates’ coefficient of thermal expansion, and vice versa.

100 .

What happens if mineral oil is present in mixing for concrete?

A)

Improves strength

B)

Reduces strength

C)

Gives more slump

D)

Gives a smooth surface

Correct Answer : Improves strength

Explanation : Mineral oil, when used in mixing, enhances the strength of the by up to 2%.

101 .

The void ratio of________.

A)

graded coarse aggregate is roughly 0.040

B)

fine aggregate is roughly 0.45

C)

single size coarse aggregate is roughly 0.45

D)

All of the above

Correct Answer : All of the above

102 .

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is________.

A)

rounded aggregate

B)

flaky aggregate

C)

angular aggregate

D)

irregular aggregate

Correct Answer : rounded aggregate

103 .

Cement used for normal concrete construction, is obtained by burning a mixture of_______.

A)

silicious and catcareous materials

B)

argilaceous and calcareous materials

C)

silicious and argillaceous materials

D)

silicious, argillaceous and calcareous materials

Correct Answer : silicious, argillaceous and calcareous materials

104 .

Higher workability of concrete is required if the structure is

A)

thick and reinfored

B)

made with cement concrete

C)

thick and heavily reinfored

D)

thin and heavily reinforced

Correct Answer : thick and heavily reinfored

105 .

Setting time of cement increases by adding________.

A)

gypsum

B)

sodium oxide

C)

calcium chloride

D)

hydrogen peroxide

Correct Answer : gypsum

106 .

_______ is not use to make Portland Cement (PC).

A)

Sand

B)

Calcareous Rocks

C)

Argillaceous Rocks

D)

Argillocalcareous Rocks

Correct Answer : Sand

Explanation : Sand is mixed with Cement to make concrete instead of making cement. Materials which we get from these 3 rocks are useful to make healty PC.

107 .

What is the percentage of CLINKER in PC?

A)

2-3%

B)

2-6%

C)

3-5%

D)

4-6%

Correct Answer : 2-6%

Explanation : Portland cement is made by mixing substances containing CaCO3 with substances containing SiO2, Al2O3, Fe2O3 and heating them to a clinker which is subsequently ground to powder and mixed with 2-6 % gypsum.

108 .

An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. seive No. 9, more than______.

A)

20%

B)

15%

C)

10%

D)

5%

Correct Answer : 10%

109 .

The top diameter, bottom diameter and the height of a slump mould are :

A)

20 cm, 30 cm, 10 cm

B)

20 cm, 10 cm, 30 cm

C)

10 cm, 30 cm, 20 cm

D)

10 cm, 20 cm, 30 cm

Correct Answer : 10 cm, 20 cm, 30 cm

110 .

What is dry process?

A)

Grinding and mixing of the raw materials in their wet state

B)

Grinding and mixing of the raw materials in their dry state

C)

Grinding and mixing of the raw materials in their medium state

D)

Grinding and mixing of the raw materials in their super dry state

Correct Answer : Grinding and mixing of the raw materials in their dry state

Explanation : Grinding and mixing of the raw materials in their dry state is known as dry process and grinding and mixing of the raw materials in their wet state is known as wet process.

111 .

The raw materials is so hard (solid) that they _________ disintegrate by water.

A)

do

B)

may be

C)

do not

D)

may or may not

Correct Answer : do not

Explanation : The raw materials is so hard that they do not differentiate by water because the water might freeze in the mixture.

112 .

The bulk density of aggregates does not depend upon :

A)

size and shape of the container

B)

grading of aggregates

C)

size and shape of aggregates

D)

specific gravity of aggregates

Correct Answer : size and shape of the container

113 .

While compacting the concrete by a mechanical vibrator, the slump should not exceed______.

A)

2.5 cm

B)

5.0 cm

C)

7.5 cm

D)

10 cm

Correct Answer : 5.0 cm

114 .

Construction joints are provided______.

A)

where B.M. and S.F. are small

B)

at 18 m apart in huge structures

C)

where the member is supported by other member

D)

All of the above

Correct Answer : All of the above

115 .

An aggregate is said to be flaky if its least dimension is less than_______.

A)

1/5th of mean dimension

B)

2/5th of mean dimension

C)

3/5th of mean dimension

D)

4/5th of mean dimension

Correct Answer : 3/5th of mean dimension

116 .

The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning________.

A)

1 : 2 : 4

B)

1 : 3 : 6

C)

1 : 2 : 8

D)

1 : 4 : 10

Correct Answer : 1 : 4 : 10

117 .

The ratio of the length to breadth of a wooden float, is

A)

8.5

B)

7.5

C)

6.5

D)

5.5

Correct Answer : 7.5

118 .

If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is______.

A)

7.40

B)

7.45

C)

7.30

D)

7.35

Correct Answer : 7.40

119 .

Curing a concrete for long period ensures better_________.

A)

strength

B)

volume stability

C)

water resistance

D)

All of the above

Correct Answer : All of the above

120 .

For the construction of cement concrete floor, the maximum permissible size of aggregate, is______.

A)

6 mm

B)

8 mm

C)

10 mm

D)

12 mm

Correct Answer : 10 mm

121 .

1.S.I. has specified the full strength of concrete after__________.

A)

14 days

B)

21 days

C)

28 days

D)

35 days

Correct Answer : 28 days

122 .

For given workability the grading requiring the least amount of water is one that gives_________.

A)

least weight for the given cement and aggregates

B)

greatest surface area for the given cement and aggregates

C)

greatest weight for the given cement and aggregates

D)

least surface area for the given cement and aggregates

Correct Answer : greatest surface area for the given cement and aggregates

123 .

The minimum percentage of chemical ingredient of cement is that of_____.

A)

lime

B)

silica

C)

iron oxide

D)

magnesium oxide

Correct Answer : magnesium oxide

124 .

Horizontal construction joints in concrete walls are generally provided at_______

A)

floor level

B)

soffit level

C)

window sill level

D)

All of the above

Correct Answer : All of the above

125 .

What is wet process?

A)

Grinding and mixing of the raw materials in their wet state

B)

Grinding and mixing of the raw materials in their dry state

C)

Grinding and mixing of the raw materials in their medium state

D)

Grinding and mixing of the raw materials in their overheated state

Correct Answer : Grinding and mixing of the raw materials in their wet state

Explanation : Grinding and mixing of the raw materials in their wet state is called wet process and grinding and mixing of the raw materials in their dry state is called dry process.

126 .

What is the moisture content in slurry for wet process?

A)

12%

B)

35-50%

C)

40-45%

D)

100%

Correct Answer : 35-50%

Explanation : The moisture content in slurry for wet process is 35-50%. 12% is the moisture content for dry process.

127 .

The slurry with the desired lime content passes into the _____

A)

Clinker

B)

Cement silo

C)

Rotary kiln

D)

Slurry tank

Correct Answer : Rotary kiln

Explanation : The slurry with the desired lime content passes into the rotary kiln up to 8 m in diameter and length 230m.

128 .

Percentage of pozzolanic material containing clay upto 80% used for the manufacture of pozzolana cement, is____.

A)

30%

B)

40%

C)

50%

D)

60%

Correct Answer : 30%

129 .

For batching 1:3:6 concrete mix by volume, the ingredients required per bag of 50 kg cement, are :

A)

70 kg of sand and 140 litres of aggregates

B)

70 litres of sand and 120 litres of aggregates

C)

105 litres of sand and 140 litres of aggregates

D)

105 litres of sand and 210 litres of aggregates

Correct Answer : 105 litres of sand and 210 litres of aggregates

130 .

What is hydration of cement?

A)

Chemical reaction of cement with base

B)

Chemical reaction of cement with acid

C)

Chemical reaction of cement with salt, and acid

D)

Chemical reaction of cement with water

Correct Answer : Chemical reaction of cement with water

Explanation : As water comes into contact with cement particles, hydration reactions immediately starts at the surface of the particles.

131 .

As the hydration proceeds the deposits of hydrated products on the original cement grains makes the diffusion of water to unhydrated nucleus ________

A)

Average

B)

Easy

C)

Very easy

D)

Very difficult

Correct Answer : Very difficult

Explanation : It is difficult thus the rate of hydration decreases with time & as result hydration may take several years.

132 .

The development of first 28 days strength is on account of the hydration of______.

A)

Câ‚‚S

B)

Câ‚ƒS

C)

Câ‚ƒA

D)

Câ‚„AF

Correct Answer : Câ‚ƒS

Explanation : Higher Câ‚ƒS→higher early strength-higher heat generation (roads, cold environments). Higher CS→lower early strength-lower heat generation (dams).

133 .

If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is

A)

2200 bags

B)

2400 bags

C)

2700 bags

D)

3000 bags

Correct Answer : 2700 bags

134 .

Strength of concrete with passage of time_______.

A)

increases

B)

decreases

C)

fluctuates

D)

remains constant

Correct Answer : increases

135 .

What is the diameter and length of the kiln respectively?

A)

6m and 200m

B)

6m and 6m

C)

200m and 6m

D)

200m and 200m

Correct Answer : 6m and 200m

Explanation : They are produced in a range of sizes and units with diameters up to 6 m and lengths up to 200 m have been made.

136 .

What is the range of CaCOâ‚ƒ in Argillocalcareous Rocks?

A)

<45%

B)

40-75%

C)

75%

D)

>75%

Correct Answer : 40-75%

Explaination : It is the standard value for in Argillocalcareous Rocks (40-75% CaCOâ‚ƒ such as clayey limestone, clayey marl).

137 .

What is the diameter of Clinker for making of Portland Cement?

A)

.3-4 m

B)

.3-4 cm

C)

.15-5 m

D)

.15-5 cm

Correct Answer : .15-5 cm

Explanation : As the materials pass through the kiln their temperature is rised upto 1300-1600 °C. The process of heating is named as “burning”. The output is known as “clinker” which is 0.15-5 cm in diameter.

138 .

Workability of concrete mix with low water cement ratio is determined by_______.

A)

slump test

B)

tensile strength test

C)

compaction factor test

D)

flexural strength test

Correct Answer : compaction factor test

139 .

The bulk density of aggregates, is generally expressed as_______.

A)

g/cmÂ³

B)

kg/litre

C)

kg/cubic metre

D)

tonnes/cubic metre

Correct Answer : kg/litre

140 .

The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is______.

A)

150 kg/cmÂ²

B)

200 kg/cmÂ²

C)

250 kg/cmÂ²

D)

300 kg/cmÂ²

Correct Answer : 150 kg/cmÂ²

141 .

Allowable shear strength of concrete, depends upon_______.

A)

shear strength

B)

tensile strength

C)

compressive strength

D)

None of the above

Correct Answer : shear strength

142 .

The blended meal is sieved and fed into a rotating dish called a ________.

A)

Kiln

B)

Clinker

C)

Granulator

D)

Raw meal

Correct Answer : Granulator

Explanation : The blended meal is sieved and fed into a rotating dish called a granulator, water weighing about 12% of the meal being added at the same time.

143 .

What is the moisture content in slurry for dry process?

A)

12%

B)

35-50%

C)

40-45%

D)

100%

Correct Answer : 12%

Explanation : 12% is the moisture content in slurry for dry process. The moisture content in slurry for wet process is 35-50%.

144 .

The process of proper and accurate measurement of concrete ingredients for uniformity of proportion, is known________.

A)

mixing

B)

batching

C)

curing

D)

grading

Correct Answer : batching

145 .

Pick up the correct proportions of chemical ingredients of cement__________.

A)

Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

B)

Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3

C)

Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3

D)

Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3

Correct Answer : Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3

146 .

Transport of concrete by pumps, is done for a distance of_______.

A)

100 m

B)

200 m

C)

300 m

D)

400 m

Correct Answer : 400 m

147 .

Slump test is done for_______.

A)

concrete

B)

lime

C)

clay

D)

sand

Correct Answer : concrete

148 .

For a concrete mix 1:3:6 and water cement ratio 0.6 both by weight, the quantity of water required per bag, is_______.

A)

10 kg

B)

12 kg

C)

14 kg

D)

16 kg

Correct Answer : 14 kg

149 .

The concrete mix which causes difficulty in obtaining a smooth finish, possess______.

A)

bleeding

B)

harshness

C)

segregation

D)

internal friction

Correct Answer : harshness

150 .

Le-Chatelier's apparatus is used for testing_______.

A)

hardness of cement

B)

soundness of cement

C)

strength of cement

D)

durability of cement

Correct Answer : soundness of cement

151 .

If a grading curve is horizontal bet-wen the portions of 20 mm I.S. Sieve and 4.75 mm I.S. Sieve, the graded aggregates do not contain_______.

A)

10 mm particles

B)

20 mm particles

C)

4.75 mm particles

D)

All of the above

Correct Answer : All of the above

152 .

The size of fine aggregates does not exceed________.

A)

3.00 mm

B)

3.75 mm

C)

4.75 mm

D)

5.75 mm

Correct Answer : 4.75 mm

153 .

In the wet process, the kiln is _______

A)

Vertical

B)

Slightly inclined with vertical

C)

Horizontal

D)

Slightly inclined with horizontal

Correct Answer : Slightly inclined with vertical

Explanation : The kiln is slightly inclined with horizontal so that the slurry coming from slurry tank can free fall with the gravity into the next process.

154 .

In the wet process of cement manufacturing raw material is heated to about _______

A)

650-900 Â°C

B)

900-1300 Â°C

C)

900-1050 Â°C

D)

1300-1450 Â°C

Correct Answer : 1300-1450 Â°C

Explanation : At 1300-1450 °C partial (20–30%) melting takes place, and belite reacts with calcium oxide to form alite.

155 .

The process of hardening the concrete by keeping its surface moist is known____.

A)

curing

B)

wetting

C)

placing

D)

compacting

Correct Answer : curing

156 .

The grade of concrete not recommended by I.S. : 456, is_______.

A)

M 200

B)

M 300

C)

M 400

D)

M 500

Correct Answer : M 500

157 .

Which compound is liberates higher heat?

A)

Câ‚‚S

B)

Câ‚ƒS

C)

Câ‚ƒA

D)

Câ‚„AF

Correct Answer : Câ‚ƒS

Explanation : Câ‚ƒS having a faster rate of reaction accompanied by greater heat generation developes early strength of the paste.

158 .

Which compound is liberates lower heat?

A)

Câ‚‚S

B)

Câ‚ƒS

C)

Câ‚ƒA

D)

Câ‚„AF

Correct Answer : Câ‚‚S

Explanation : Câ‚‚S hydrates & hardens slowly so results in less heat generation & developes most of the ultimate strength.

159 .

Which compound may lead to a rapid stiffening of the paste with a large amount of the heat generation?

A)

Câ‚‚S

B)

Câ‚ƒS

C)

Câ‚ƒA

D)

Câ‚„AF

Correct Answer : Câ‚ƒA

Explanation : Câ‚ƒA is characteristically fast reacting with water & may lead to a rapid stiffening of the paste with a large amount of the heat generation (Flash-Set)-(Quick-Set).

160 .

Ordinary Portland cement is manufactured from_____

A)

pozzolana

B)

gypsum and lime

C)

lime stone and clay

D)

lime, pozzolana and clay

Correct Answer : gypsum and lime

161 .

A flaky aggregate is said to be elongated if its length is______.

A)

equal to the mean size

B)

twice the mean size

C)

thrice the mean size

D)

four times the mean size

Correct Answer : twice the mean size

162 .

To prevent segregation, the maximum height for placing concrete, is_______.

A)

100 cm

B)

125 cm

C)

150 cm

D)

200 cm

Correct Answer : 150 cm

163 .

What is the composition of making the Mortar?

A)

P.C. + Water

B)

P.C. + Water + Sand

C)

Water + Sand + Gravel

D)

P.C. + Water + Sand + Gravel

Correct Answer : P.C. + Water + Sand

Explanation : Mortar is a mixture of 3 materials i.e. cement, water and sand (P.C. + sand + water = Mortar), used in building for holding bricks or stones together.

164 .

The most useless aggregate is one whose surface texture is

A)

glassy

B)

smooth

C)

granular

D)

honey combed and porous

Correct Answer : glassy

165 .

To obtain a very high strength concrete, use very fine grained_______.

A)

Granite

B)

Barite

C)

Magnetite

D)

Volcanic scoria

Correct Answer : Granite

166 .

If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is_______.

A)

15, 900 litres

B)

16, 900 litres

C)

17, 900 litres

D)

18, 900 litres

Correct Answer : 18, 900 litres

167 .

The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as_______.

A)

rapid hardening Portland cement

B)

low-heat Portland cement

C)

Portland pozzolana cement

D)

Portland blast slag cement

Correct Answer : low-heat Portland cement

168 .

What is the diameter of hard pellets?

A)

10mm

B)

12mm

C)

15mm

D)

18mm

Correct Answer : 15mm

Explanation : Hard pellets about 15 mm in diameter are formed. The pellets are baked hard in a pre-heating grate by means of hot gases from the kiln.

169 .

What is the percentage of cement produced in dry process?

A)

85%

B)

80%

C)

75%

D)

70%

Correct Answer : 75%

Explanation : In this process, calcareous material and argillaceous material are ground separately to fine powder in the absence of water and then are mixed together in the desired proportions. Dehydration zone requires a somewhat shorter distance than the wet process.

170 .

The high strength of rapid hardening cement at early stage, is due to its______.

A)

increased lime cement

B)

finer grinding

C)

burning at high temperature

D)

higher content of tricalcium

Correct Answer : increased lime cement

171 .

Vicat's apparatus is used for______.

A)

soundness test

B)

consistency test

C)

fineness test

D)

compressive strength test

Correct Answer : consistency test

172 .

M 150 grade of concrete approximates_______.

A)

1 : 2 : 4 mix

B)

1 : 1 :2 mix

C)

1 : 3 : 6 mix

D)

1 : 1.5 : 3 mix

Correct Answer : 1 : 2 : 4 mix

173 .

The rock which is not calcareous, is :

A)

macl

B)

chalk

C)

lime stone

D)

laterite

Correct Answer : laterite

174 .

An aggregate is known as cyclopean aggregate if its size is more than_________.

A)

30 mm

B)

60 mm

C)

75 mm

D)

90 mm

Correct Answer : 75 mm

175 .

Particles of 0.002 mm size are that of_____.

A)

clay

B)

sand

C)

gravel

D)

None of the above

Correct Answer : clay

176 .

C.R.R.I. charts are used to obtain a relatioship between strength of concrete and_____.

A)

workability

B)

water cement ratio

C)

fineness modulus

D)

grading of aggregate

Correct Answer : water cement ratio

177 .

Workability of concrete for a given water content is good if the aggregates, are_______.

A)

angular aggregate

B)

flaky aggregates

C)

rounded aggregate

D)

irregular aggregate

Correct Answer : rounded aggregate

178 .

For compacting plain concrete road surface of thickness less than 20 cm, we use________.

A)

screed vibrator

B)

form vibrator

C)

internal vibrator

D)

None of the above

Correct Answer : screed vibrator

179 .

Specified compressive strengh of concrete is obtained from cube tests at the end of______.

A)

7 days

B)

14 days

C)

21 days

D)

28 days

Correct Answer : 28 days

180 .

The percentage of the aggregate of F.M. 2.6 to be combined with coarse aggregate of F.M. 6.8 for obtaining the aggregates of F.M. 5.4, is____.

A)

60%

B)

50%

C)

40%

D)

30%

Correct Answer : 50%

181 .

How many principal thermal properties are there for aggregates?

A)

1

B)

2

C)

3

D)

4

Correct Answer : 3

Explanation : There are 3 principal thermal properties for aggregates :

* coefficient of thermal expansion.
* specific heat.
* thermal conductivity.

182 .

If the coefficient of thermal expansion of coarse aggregates and cement paste differs too much, then what happen?

A)

No change

B)

A small change in pressure may introduce

C)

A small change in temperature may introduce

D)

A large change in temperature may introduce

Correct Answer : A large change in temperature may introduce

Explanation : If it happens then a large change in temperature may introduce differential movement which may break the bond between the aggregates and the paste.

183 .

For majority of aggregates, the coefficient of thermal expansion lies between approximately _________

A)

5.4 * 10â»â¶ and 12.6 * 10â»â¶ per Â°C

B)

5.4 * 10â»â¶ and 10.8 * 10â»â¶ per Â°C

C)

10.8 * 10â»â¶ and 16.2 * 10â»â¶ per Â°C

D)

10.8 * 10â»â¶ and 12.6 * 10â»â¶ per Â°C

Correct Answer : 5.4 * 10â»â¶ and 12.6 * 10â»â¶ per Â°C

Explanation : The coefficient of thermal expansion lies between approximately 5.4 * 10â»â¶ and 12.6 * 10â»â¶ per °C.

184 .

For hydrated Portland cement, the coefficient of thermal expansion lies between approximately ________

A)

5.4 * 10â»â¶ and 12.6 * 10â»â¶ per Â°C

B)

5.4 * 10â»â¶ and 10.8 * 10â»â¶ per Â°C

C)

10.8 * 10â»â¶ and 16.2 * 10â»â¶ per Â°C

D)

10.8 * 10â»â¶ and 12.6 * 10â»â¶ per Â°C

Correct Answer : 10.8 * 10â»â¶ and 16.2 * 10â»â¶ per Â°C

Explanation : The coefficient of thermal expansion for hydrated Portland cement lies between approximately 10.8 * 10â»â¶ and 16.2 * 10â»â¶ per °C.

185 .

The linear thermal coefficient of expansion lies between approximately _______

A)

5.4 * 10â»â¶ and 12.6 * 10â»â¶ per Â°C

B)

5.8 * 10â»â¶ and 14 * 10â»â¶ per Â°C

C)

10.8 * 10â»â¶ and 16.2 * 10â»â¶ per Â°C

D)

10.8 * 10â»â¶ and 12.6 * 10â»â¶ per Â°C

Correct Answer : 5.8 * 10â»â¶ and 14 * 10â»â¶ per Â°C

Explanation : The linear thermal coefficient of expansion lies between approximately 5.8 * 10â»â¶ and 14 * 10â»â¶ per °C depending upon the type of aggregates.

186 .

If the various concrete ingredients i.e. cement, sand and aggregates are in the ratio of 1:3:6, the grade of concrete, is_________.

A)

M 100

B)

M 150

C)

M 200

D)

M 250

Correct Answer : M 100

187 .

The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than_________.

A)

90 minutes

B)

75 minutes

C)

60 minutes

D)

30 minutes

Correct Answer : 30 minutes

188 .

Sand requiring a high water cement ratio, belongs to______.

A)

Zone I

B)

Zone II

C)

Zone III

D)

Zone IV

Correct Answer : Zone I

189 .

According to geological origin, aggregates is/are classified into __________ types.

A)

1

B)

2

C)

3

D)

4

Correct Answer : 2

Explanation : There are 2 types of aggregates based on geological origin. They are natural aggregates and artificial aggregates.

190 .

According to size, aggregates is/are classified into __________ types.

A)

1

B)

2

C)

3

D)

4

Correct Answer : 4

Explanation : There are 4 types of aggregates based on size. They are :

* fine aggregates,
* coarse aggregates,
* all in aggregates
* single size aggregates

191 .

Aggregate crushed before the application of full load of _______

A)

20ton

B)

30ton

C)

40ton

D)

None of the above

Correct Answer : 40ton

Explanation : Aggregate crushed before the application of full load of 40ton, the weaker material become compacted, so that the amount of crushing in later stage of the test is reduced.

192 .

According to Water-Cement Ratio Law, the strength of workable plastic concrete________.

A)

depends upon the amount of water used in the mix

B)

does not depend upon the quality of cement mixed with aggregates

C)

does not depend upon the quanity of cement mixed with aggregates

D)

All of the above

Correct Answer : All of the above

193 .

Saw dust can be rendered chemically inert by boiling it in water containing_________.

A)

ferrous sulphate

B)

nitric acid

C)

sulphuric acid

D)

potassium chloride

Correct Answer : ferrous sulphate

194 .

If the engineer-in-charge approves, the 10 cm cubes may be used for the work test of concrete provided maximum nominal size of aggregate, does not exceed_____.

A)

25 cm

B)

20 cm

C)

15 cm

D)

10 cm

Correct Answer : 20 cm

195 .

The diameter of the Vicat plunger is 10 mm and its length varies from_____.

A)

20 mm to 30 mm

B)

30 mm to 40 mm

C)

40 mm to 50 mm

D)

50 mm to 60 mm

Correct Answer : 40 mm to 50 mm

196 .

Separation of water or water sand cement from a freshly concrete, is known_______.

A)

flooding

B)

bleeding

C)

creeping

D)

segregation

Correct Answer : bleeding

197 .

The unit weight of heavy weight concrete varies from __________ kg/mÂ³

A)

1000

B)

1400

C)

2000

D)

2400

Correct Answer : 2400

Explanation : The unit weight of heavy weight concrete varies from 2400 kg/m³ with sp.gr range from 4.0 to 4.6. (eg: mineral ore sand barite).

198 .

S.I. unit of bulk density is?

A)

kg/l

B)

g/ml

C)

kg/ml

D)

None of the above

Correct Answer : kg/l

199 .

The average specific gravity of natural aggregate is?

A)

1

B)

1.5

C)

2.7

D)

3

Correct Answer : 2.7

Explanation : The average specific gravity of majority of natural aggregates lies between 2.6 and 2.8.

200 .

Pick up the most appropriate statement from the following.

A)

Sp. Gr. = a-b/c

B)

Sp. Gr. = c/a-b

C)

Sp. Gr. = (a-b)/c

D)

Sp. Gr. = c/(a-b)

Correct Answer : Sp. Gr. = c/(a-b)

Explanation : Specific gravity is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.

201 .

Internal friction between the ingredients of concrete, is decreased by using

A)

rich mix

B)

less water

C)

fine aggregates

D)

more water and coarse aggregates

Correct Answer : more water and coarse aggregates

202 .

For road pavements, the cement generally used, is_________.

A)

low heat cement

B)

rapid hardening cement

C)

ordinary Portland cement

D)

blast furnace slag cement

Correct Answer : rapid hardening cement

203 .

What do you mean by bulking?

A)

Fine aggregate shows completely realistic volume

B)

The state of setting someone or something apart from others

C)

The volume increase of fine aggregate due to presence of moisture content in it

D)

The moisture present in aggregate forms a film around each particle

Correct Answer : The volume increase of fine aggregate due to presence of moisture content in it

Explanation : The volume increase of fine aggregate due to presence of moisture content is known as bulking. Fine sand bulks more as compared to coarse sand.

204 .

If h = height of sand when moist and h1 is the height when saturated then what is the percentage of bulking?

A)

{(h-h1)/h1}*100

B)

{(h-h1)/h}*100

C)

{(h1-h)/h}*100

D)

{(h1-h)/h1}*100

Correct Answer : {(h-h1)/h1}*100

Explanation : It is the formula to calculate the percentage of bulking. Percentage in bulking = {(h-h1)/h1}*100.

205 .

What is bulking of coarse aggregates?

A)

Negligible

B)

More than sand

C)

Less than sand

D)

Equal than sand

Correct Answer : Negligible

Explanation : Bulking is indirectly proportional to the particle size of the aggregates. Size of coarse aggregates is more hence negligible bulking.

206 .

The internal dimensions of a ware house are 15 m x 5.6 m, and the maximum height of piles is 2.70 m, the maximum number of bags to be stored in two piles, are_________.

A)

4000 bags

B)

3000 bags

C)

2500 bags

D)

2000 bags

Correct Answer : 3000 bags

207 .

The maximum thickness of concrete floor of a cement warehouse, is_____.

A)

10 cm

B)

15 cm

C)

20 cm

D)

25 cm

Correct Answer : 25 cm

208 .

The compaction of concrete, improves_____.

A)

density

B)

strength

C)

durability

D)

All of the above

Correct Answer : All of the above

209 .

The light weight aggregates are obtained from_____.

A)

igneous rocks

B)

sedimentary rocks

C)

volcanic source

D)

metamorphic rocks

Correct Answer : volcanic source

210 .

If the depth of moist sand in a cylinder is 15 cm and the depth of the sand when fully inundated with water is 12 cm, the bulking of the moist sand, is_____.

A)

25%

B)

20%

C)

15%

D)

12%

Correct Answer : 25%

211 .

A maximum value of ___ percent is allowed for WBM base course in Indian conditions.

A)

50

B)

40

C)

35

D)

25

Correct Answer : 40

Explanation : A maximum value of 40% age is allowed for WBM base course in Indian conditions.

212 .

The loss in weight should not exceed _________ percent when tested with sodium sulphate and _________ percent with magnesium sulphate solution.

A)

12, 18

B)

10, 15

C)

15, 10

D)

18, 12

Correct Answer : 12, 18

Explanation : The loss in weight should not exceed 12 percent when tested with sodium sulphate and 18 percent with magnesium sulphate solution.

213 .

The thermal conductivity of the aggregates is _______

A)

The ability to insulate the heat

B)

Is a measure of its heat capacity

C)

The ability to conduct the heat

D)

Same as thermal conductivity

Correct Answer : The ability to conduct the heat

Explanation : Thermal conductivity is the ability of the aggregates to conduct the heat.

214 .

An aggregate which passes through 25 mm I.S. sieve and is retained on 20 mm sieve, is said to be flaky if its least dimension is less than_____.

A)

18.5 mm

B)

16.5 mm

C)

15.5 mm

D)

13.5 mm

Correct Answer : 13.5 mm

215 .

Expansion joints are provided if the length of concrete structures exceeds_______.

A)

35 m

B)

45 m

C)

25 m

D)

15 m

Correct Answer : 45 m

216 .

If the slump of a concrete mix is 60 mm, its workability is______.

A)

very low

B)

low

C)

medium

D)

high

Correct Answer : medium

217 .

Log Angles machine is used to test the aggregate for________.

A)

impact value

B)

water absorption

C)

crushing strength

D)

abrasion resistance

Correct Answer : abrasion resistance

218 .

If fineness modulus of sand is 2.5, it is graded as________.

A)

fine sand

B)

medium sand

C)

coarse sand

D)

very coarse sand

Correct Answer : fine sand

219 .

Pozzolana cement is used with confidence for construction of________.

A)

dams

B)

abutments

C)

massive foundations

D)

All of the above

Correct Answer : All of the above

220 .

Efflorescence in cement is caused due to an excess of_______.

A)

silica

B)

alkalis

C)

alumina

D)

iron oxide

Correct Answer : alkalis

221 .

The datum temperature for maturity by Plowman, is________.

A)

23Â°C

B)

0Â°

C)

- 5.6Â°C

D)

- 11.7Â°C

Correct Answer : - 11.7Â°C

222 .

The vegetable oil if present in mixing for concrete _____

A)

Reduces strength

B)

Gives more slump

C)

Improves strength

D)

Gives a smooth surface

Correct Answer : Reduces strength

Explanation : If vegetable oil is present in mixing of concrete then it will reduces the strength due to more lubrication.

223 .

The mineral oil if present in mixing for concrete ______

A)

Gives more slump

B)

Reduces strength

C)

Improves strength

D)

Gives a smooth surface

Correct Answer : Improves strength

Explanation : The mineral oil if present in mixing for concrete increases strength for the concentration up to 2%.

224 .

To neutralize 200 ml of sample should not require more than 10 ml of __________ normal HCI using methyl orange.

A)

1

B)

.1

C)

10

D)

.01

Correct Answer : .1

Explanation : To neutralize 200 ml of sample should not require more than 10 ml of 0.1 normal HCI using methyl orange as an indicator and .1 and .01 is very slow process.

225 .

What is the permissible limits for construction of organic matter in water?

A)

200mg/l

B)

500mg/l

C)

2000mg/l

D)

3000mg/l

Correct Answer : 200mg/l

Explanation : 200mg/l is the standard value for the permissible limits for construction of organic matter in water.

226 .

What is the permissible limits for construction of inorganic matter in water?

A)

200mg/l

B)

500mg/l

C)

2000mg/l

D)

3000mg/l

Correct Answer : 3000mg/l

Explanation : 3000mg/l is the standard value for the permissible limits for construction of inorganic matter in water.

227 .

What is the permissible limits for construction of suspended matter in water?

A)

200mg/l

B)

500mg/l

C)

2000mg/l

D)

3000mg/l

Correct Answer : 2000mg/l

Explanation : 2000mg/l is the standard value for the permissible limits for construction of suspended matter in water.

228 .

What is the permissible limits for construction of chlorides in water for RCC work?

A)

200mg/l

B)

500mg/l

C)

1000mg/l

D)

2000mg/l

Correct Answer : 1000mg/l

Explanation : 1000mg/l is the standard value for the permissible limits for construction of chlorides in water for RCC work.

229 .

What is the permissible limits for construction of chlorides in water for PCC work?

A)

200mg/l

B)

500mg/l

C)

1000mg/l

D)

2000mg/l

Correct Answer : 2000mg/l

Explanation : 2000mg/l is the standard value for the permissible limits for construction of chlorides in water for PCC work.

230 .

What is the permissible limits for construction of sulphates in water?

A)

200mg/l

B)

500mg/l

C)

1000mg/l

D)

2000mg/l

Correct Answer : 500mg/l

Explanation : 500mg/l is the standard value for the permissible limits for construction of sulphates in water.

231 .

What is the maximum limit (ppm) for chlorides in water?

A)

500

B)

1000

C)

1500

D)

2000

Correct Answer : 500

Explanation : It is the standard value of maximum limit (ppm) for chlorides in water for construction.

232 .

What is the maximum limit (ppm) for SO3 in water?

A)

500

B)

1000

C)

1500

D)

2000

Correct Answer : 1000

Explanation : It is the standard value of maximum limit (ppm) for Sulphur trioxide in water for construction.

233 .

What is the maximum limit (ppm) for turbidity in water?

A)

500

B)

1000

C)

1500

D)

2000

Correct Answer : 1500

Explanation : It is the standard value of maximum limit (ppm) for turbidity in water for construction.

234 .

What is the maximum limit (ppm) for Alkali Carbonates and Bicarbonates in the water?

A)

500

B)

1000

C)

1500

D)

2000

Correct Answer : 1000

Explanation : It is the standard value of maximum limit (ppm) for Alkali Carbonates and Bicarbonates in water for construction.

235 .

What is water proofing admixtures?

A)

Water fair material

B)

Water absorption material

C)

Water adsorption material

D)

Water repellent materials

Correct Answer : Water repellent materials

Explanation : Water proofing admixtures are available in powder, paste or liquid form and may consist of pore filling or water repellent materials.

236 .

Which one is not a chemically active pore filling material?

A)

Zinc

B)

Chalk

C)

Aluminium

D)

Silicate of soda

Correct Answer : Chalk

Explanation : Chemically active pore filling materials: silicate of soda, aluminium, zinc sulphates and calcium chloride.

237 .

Chemically inactive pore fillers __________ the workability.

A)

Improve

B)

Increase

C)

Decrease

D)

Donâ€™t affect

Correct Answer : Improve

Explanation : Chemically inactive pore fillers improve the workability and to facilitate the reduction of water for given workability and to make dense concrete which is basically impervious.

238 .

Entrapped air normally exists in the form of relatively __________ air voids.

A)

Small

B)

Medium

C)

Large

D)

Absent

Correct Answer : Large

Explanation : Entrapped air normally exists in the form of relatively large air voids, which are not dispersed uniformly throughout the mix, entrained air exists in the form of minute disconnected bubbles well distributed throughout the mix.

239 .

Workability of concrete can be improved by ________

A)

More sand

B)

More cement

C)

More fine aggregates

D)

Fineness of coarse aggregate

Correct Answer : More cement

Explanation : Workability of concrete can be improved by more cement and water with proper water cement ratio.

240 .

Workability of concrete is inversely proportional to _______

A)

Time of transit

B)

Aggregates cement ratio

C)

Grading of the aggregates

D)

Water cement ratio

Correct Answer : Water cement ratio

Explanation : Workability of concrete is inversely proportional to the Water cement ratio because if the amount of w/c ratio increases, workability decreases.

241 .

A compaction factor of .85 for a cement concrete sample indicates ___________

A)

Low workability

B)

Good workability

C)

Medium workability

D)

Very good workability

Correct Answer : Low workability

Explanation : Roads vibrated by hand-operated machines. At the more workable end of this group, concrete may be manually compacted in roads using aggregate of rounded or irregular shape.

242 .

Why Shape and texture of aggregates is a must?

A)

Smooth surfaces give poor workability

B)

Smooth surfaces give better workability

C)

Rough surfaces give poor workability

D)

Rough surfaces give better workability

Correct Answer : Smooth surfaces give better workability

Explanation : The use of smooth and rounded, rather than irregularly shaped aggregate also increases workability.

243 .

What could be the possible answer among the following for compressive strength of high strength concrete?

A)

10MPa

B)

20MPa

C)

30MPa

D)

40MPa

Correct Answer : 40MPa

Explanation : High strength of concrete has the compressive strength greater or equal to 40MPa.

244 .

Which type of aggregates are used to produce 70MPa compressive strength?

A)

Fine

B)

Flaky

C)

Coarse

D)

All in one

Correct Answer : Coarse

Explanation : To produce 70 MPa compressive strength, coarse aggregates are being used in HSC.

245 .

Maximum size of aggregates are used to produce 70MPa compressive strength is ________

A)

10-20 mm

B)

20-30 mm

C)

30-40 mm

D)

40-50 mm

Correct Answer : 20-30 mm

Explanation : Maximum size of aggregates is 20-30 mm are used to produce 70MPa compressive strength.

246 .

Use of HSC in column _______

A)

Decrease the no of steel required in the same column

B)

Increase the no of steel required in the same column

C)

Increase the no of steel required in the different column

D)

Decrease the no of steel required in the different column

Correct Answer : Decrease the no of steel required in the same column

247 .

Ultra-High Performance Concrete (UHPC), also known as ______

A)

Reactive powder concrete

B)

NPC

C)

Active powder concrete

D)

High Strength concrete

Correct Answer : Reactive powder concrete

Explanation : Ultra-High Performance Concrete (UHPC), also known as reactive powder concrete (RPC), is a high-strength, ductile material.

248 .

The material used for UHPC provides compressive strengths up to ________

A)

17000 psi

B)

20000 psi

C)

25000 psi

D)

29000 psi

Correct Answer : 29000 psi

Explanation : The material provides compressive strengths of up to 29000 pounds per square inch.

249 .

Range of modulus of elasticity for UHPC ________

A)

30-35 GPa

B)

35-40 GPa

C)

45-50 GPa

D)

40-45 GPa

Correct Answer : 45-50 GPa

Explanation : 45-50 GPa or 6500 to 7300 ksi is the range of modulus of elasticity for ultra-high performance concrete.

250 .

Clay minerals are found in most ____

A)

Igneous Environment

B)

Sedimentary environment

C)

Metamorphic environment

D)

In all environment

Correct Answer : Sedimentary environment

Explanation : Clay minerals are common in sedimentary formations and seismic measurements are our main tools for studying sub-surface lithology.

251 .

Theoretical value for bulk modulus of clay __________

A)

200 GPa

B)

100-150 GPa

C)

20 and 50 GPa

D)

30 and 40 GPa

Correct Answer : 20 and 50 GPa

252 .

The grain density of the clay powders was measured using _______

A)

Pycnometer

B)

Cylindrical cavity

C)

Helium porosimeter

D)

Hydrostatic pressure

Correct Answer : Pycnometer

Explanation : The grain density of the clay powders was measured using a pycnometer.

253 .

For the cold-pressed aggregate samples, porosity, bulk and grain densities were measured with __________

A)

Pycnometer

B)

Cylindrical cavity

C)

Hydrostatic pressure

D)

Helium porosimeter

Correct Answer : Helium porosimeter

Explanation : For the cold-pressed aggregate samples, porosity, bulk and grain densities were measured at room P–T conditions with a helium porosimeter.

254 .

IS 456 of 2000 gives the modulus of elasticity as _______

A)

Ec = 5000 fckÂ²

B)

Ec = 5000 fckâ‹…âµ

C)

Ec = 5000 fckÂ³

D)

Ec = 5000 fckâ…“

Correct Answer : Ec = 5000 fckâ‹…âµ

Explanation : IS 456 of 2000 gives the modulus of elasticity as Ec = 5000 fck⋅âµ where Ec is the modulus of elasticity in N/mm²

255 .

What are elastic strains?

A)

It is the time-dependent deformation that occurs on the prolonged application of stress

B)

These deformations occur either on loss of moisture from the concrete on cooling of concrete

C)

These are the instantaneous deformations that occur when an external stress is first applied

D)

Any one or combinations of the above types of deformations in a hardened concrete leads to cracking

Correct Answer : These are the instantaneous deformations that occur when an external stress is first applied

Explanation : Elastic strain in concrete, as defined above, depends on the externally applied stress and the modulus of elasticity of concrete.

256 .

Static modulus of elasticity of concrete has been related to its ________

A)

Applied force

B)

Tensile strength

C)

External strength

D)

Compressive strength

Correct Answer : Compressive strength

Explanation : Static modulus of elasticity of concrete has been related to its compressive strength by the various Standards.

257 .

How many types of shrinkages, caused due to loss of water?

A)

1

B)

2

C)

3

D)

4

Correct Answer : 3

Explanation : There are 3 types of shrinkage that are caused due to loss of water i.e. plastic, drying and autogenous.

258 .

How many types of shrinkages, caused due to cooling and carbonation?

A)

1

B)

2

C)

3

D)

4

Correct Answer : 2

Explanation : There are 2 types of shrinkage which are caused due to cooling and carbonation.

259 .

Durability of concrete is proportional to _________

A)

Cement aggregate ratio

B)

Sand content

C)

Aggregate ratio

D)

Water cement ratio

Correct Answer : Cement aggregate ratio

Explanation : Volume chances due to difference in thermal properties of the aggregates and cement paste.

260 .

Strength of concrete show an increase with _________

A)

Increase in rate of loading

B)

Decrease in rate of loading

C)

Unaffected by rate of loading

D)

Depends on application of load

Correct Answer : Increase in rate of loading

Explanation : Strength of concrete is directly proportional to the nature of the loading.

261 .

Strength of concrete increase with _________

A)

Decrease in curing time

B)

Decrease with w/c ratio

C)

Increase with w/c ratio

D)

Decrease in size of aggregates

Correct Answer : Decrease with w/c ratio

Explanation : As mentioned above that Strength of concrete is inversely proportional to w/c ratio.

262 .

Approximate ratio of the strength of the cement conc of 7 days to that of 28 days (2/3)?

A)

1.15

B)

1

C)

.85

D)

.75

Correct Answer : .75

Explanation : After the lab broke the seven-day cylinders, the cylinder from the pier with added water broke at 1980 psi. The other seven-day cylinders were as high as 2620 psi.

263 .

Approximate ratio of direct tensile strength to flexural strength is ________

A)

.5

B)

.05

C)

.25

D)

.33

Correct Answer : .5

Explanation : Approximate ratio of direct tensile strength to flexural strength is .5 according to the formula.

264 .

The _________ compressive strength required from structural consideration.

A)

Maximum

B)

Nominal

C)

Minimum

D)

None of the above

Correct Answer : Minimum

Explanation : Option C can be eliminated easily because we need atleast some compressive strength. The minimum compressive strength required from structural consideration.

265 .

The adequate workability necessary for _________ compaction with the compacting equipment available.

A)

Full

B)

Half

C)

Double

D)

Quarter

Correct Answer : Double

Explanation : Option C can be eliminated easily because double compaction is not possible. The adequate workability necessary for full compaction with the compacting equipment available.

266 .

What C31 test under the Standard ASTM test method?

A)

Test Method for Slump of Hydraulic Cement Concrete

B)

Test Method for Making and Curing Concrete Test Specimens in the Field

C)

Test Method for Compressive Strength of Cylindrical Specimen

D)

Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete

Correct Answer : Test Method for Making and Curing Concrete Test Specimens in the Field

Explanation : According to Standard ASTM test methods to evaluate field-placed concrete C31 test is for Test Method for Making and Curing Concrete Test Specimens in the Field.

267 .

What C39 test under the Standard ASTM test method?

A)

Test Method for Compressive Strength of Cylindrical Specimen

B)

Test Method for Slump of Hydraulic Cement Concrete

C)

Test Method for Making and Curing Concrete Test Specimens in the Field

D)

Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete

Correct Answer : Test Method for Compressive Strength of Cylindrical Specimen

Explanation : According to Standard ASTM test methods to evaluate field-placed concrete C39 test is for Test Method for Compressive Strength of Cylindrical Specimen.

268 .

What C138 test under the Standard ASTM test method?

A)

Test Method for Slump of Hydraulic Cement Concrete

B)

Test Method for Compressive Strength of Cylindrical Specimen

C)

Test Method for Making and Curing Concrete Test Specimens in the Field

D)

Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete

Correct Answer : Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete

Explanation : According to Standard ASTM test methods to evaluate field-placed concrete C138 test is for Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete.

269 .

Quality control helps to ____________ the risks of overdesign that ___________ the overall cost.

A)

Maximize, Increase

B)

Minimize, Increase

C)

Maximize, Decrease

D)

Minimize, Decrease

Correct Answer : Minimize, Decrease

Explanation : Quality control helps to minimize the risks of overdesign that reduces the overall cost.

270 .

__________ cost of maintenance of the structure __________ construction due to quality works.

A)

Maximize, after

B)

Minimize, before

C)

Minimize, after

D)

Maximize, before

Correct Answer : Minimize, after

Explanation : Minimize the cost of repair and maintenance of the structure after construction due to quality works.

271 .

It __________ job-site concrete handling, and testing procedures to __________ potential liability to the company.

A)

Improve, Increase

B)

Improve, Decrease

C)

Ruin, Decrease

D)

Ruin, Increase

Correct Answer : Improve, Decrease

Explanation : It improves job-site concrete handling, curing, sampling and testing procedures to reduce potential liability to the company.

272 .

What is the amount of mixing water used to make LWC?

A)

2/3

B)

1/2

C)

1/3

D)

1/4

Correct Answer : 2/3

Explanation : The general practice for structural light-weight concrete is to mix the aggregate and about 2/3 of the mixing water for a period upto one minute prior to the addition of cement and the balance mixing water.

273 .

The light-weight concrete is prepared by ________

A)

Mixing Al in the concrete

B)

Mixing Fe in the concrete

C)

Using coke-breeze, slag as aggregate in the concrete

D)

Mixing Portland cement with sawdust in specified proportion in the concrete

Correct Answer : Using coke-breeze, slag as aggregate in the concrete

Explanation : The light-weight concrete is prepared by using coke-breeze, cinder or slag as aggregate in the concrete.

274 .

How can we prevent cracks in concrete structures?

A)

Due to heavy load

B)

Settlement of structure

C)

High water cement ratio

D)

Low w/c ratio

Correct Answer : Low w/c ratio

Explanation : Low w/c ratio will directly affect the quality of concrete. A lower water cement ratio leads to high strength in concrete therefore lesser cracks.

275 .

Which can be the possible option for cracking in the building?

A)

Gain of water

B)

Low w/c ratio

C)

Due to light load

D)

Temperature difference

Correct Answer : Temperature difference

Explanation : Concrete expands and shrinks when the temperature changes which directly leads to cracking in the building.

276 .

Plastic shrinkage cracking occurs in ________ hours after placing.

A)

0.5

B)

5

C)

10

D)

24

Correct Answer : 5

Explanation : Plastic shrinkage concrete occurs within 1 hours and 8 hours after placing, when subjected to a very rapid loss of moisture.

277 .

Reduction in the volume due to shrinkage causes _______

A)

Volumetric strain

B)

W/c ratio

C)

Low volume

D)

Volumetric stress

Correct Answer : Volumetric strain

278 .

Volumetric strain is equal to ___ times the linear strain.

A)

1

B)

2

C)

3

D)

4

Correct Answer : 3

Explanation : Volumetric strain is equal to 3 times the linear strain in freshly hardened concrete.

279 .

In practice, shrinkage is measured simply as a ________

A)

Linear strain

B)

Linear stress

C)

Volumetric strain

D)

Volumetric stress

Correct Answer : Linear strain

Explanation : In practice, shrinkage is measured simply as a linear strain in freshly hardened concrete.

280 .

________ has designated the concrete mixes into a number of grades as M10, M15.

A)

IS 456-2010

B)

IS 456-2000

C)

IS 465-2000

D)

IS 513-1999

Correct Answer : IS 456-2000

Explanation : IS 456-2000 has designated the concrete mixes into a number of grades as M10, M15, M20, M25, M30, M35 and M40.

281 .

What C143 test under the Standard ASTM test method?

A)

Test Method for Slump of Hydraulic Cement Concrete

B)

Test Method for Compressive Strength of Cylindrical Specimen

C)

Test Method for Making and Curing Concrete Test Specimens in the Field

D)

Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete

Correct Answer : Test Method for Slump of Hydraulic Cement Concrete

Explanation : According to Standard ASTM test methods to evaluate field-placed concrete C143 test is for Test Method for Slump of Hydraulic Cement Concrete.

282 .

What C172 test under the Standard ASTM test method?

A)

Test Method for Temperature of Freshly Mixed Portland-Cement Concrete

B)

Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

C)

Test Method for Sampling Freshly Mixed Concrete

D)

Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method

Correct Answer : Test Method for Sampling Freshly Mixed Concrete

Explanation : According to Standard ASTM test methods to evaluate field-placed concrete C172 test is for Test Method for Sampling Freshly Mixed Concrete.

283 .

What C173 test under the Standard ASTM test method?

A)

Test Method for Sampling Freshly Mixed Concrete

B)

Test Method for Temperature of Freshly Mixed Portland-Cement Concrete

C)

Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

D)

Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method

Correct Answer : Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method

Explanation : According to Standard ASTM test methods to evaluate field-placed concrete C173 test is for Air Content of Freshly Mixed Concrete by the Volumetric Method.

284 .

What is the approx. mix proportion for M10?

A)

1:3:6

B)

1:2:4

C)

1:1:2

D)

1:1.5:3

Correct Answer : 1:3:6

Explanation : According to IS 456-2000 code, the approximate value of mix proportion for grade M10 is 1:3:6.

285 .

What is the approx. mix proportion for M15?

A)

1:3:6

B)

1:2:4

C)

1:1:2

D)

1:1.5:3

Correct Answer : 1:2:4

Explanation : According to IS 456-2000 code, the approximate value of mix proportion for grade M15 is 1:2:4.

286 .

What is the approx. mix proportion for M20?

A)

1:3:6

B)

1:2:4

C)

1:1:2

D)

1:1.5:3

Correct Answer : 1:1.5:3

Explanation : According to IS 456-2000 code, the approximate value of mix proportion for grade M20 is 1:1.5:3.

287 .

What is the approx. mix proportion for M25?

A)

1:3:6

B)

1:2:4

C)

1:1:2

D)

1:1.5:3

Correct Answer : 1:1:2

Explanation : According to IS 456-2000 code, the approximate value of mix proportion for grade M25 is 1:1:2.

288 .

What C 231 test under the Standard ASTM test method?

A)

Test Method for Sampling Freshly Mixed Concrete

B)

Test Method for Temperature of Freshly Mixed Portland-Cement Concrete

C)

Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

D)

Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method

Correct Answer : Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

Explanation : According to Standard ASTM test methods to evaluate field-placed concrete C231 test is for Air Content of Freshly Mixed Concrete by the Pressure Method.

289 .

What C 1064 test under the Standard ASTM test method?

A)

Test Method for Temperature of Freshly Mixed Portland-Cement Concrete

B)

Test Method for Sampling Freshly Mixed Concrete

C)

Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

D)

Test Method for Air Content of Freshly Mixed Concrete by the Volumetric Method

Correct Answer : Test Method for Temperature of Freshly Mixed Portland-Cement Concrete

Explanation : According to Standard ASTM test methods to evaluate field-placed concrete C1064 test is for Temperature of Freshly Mixed Portland-Cement Concrete.

290 .

__________ quality construction ___________ the wastage of materials.

A)

Bad, reduce

B)

Good, reduce

C)

Bad, Decrease

D)

Good, increase

Correct Answer : Good, reduce

Explanation : Good quality construction reduces the wastage of materials, smooth function of the team and keeps the construction cost within the limit.

291 .

Air contents should be _________ % by volume.

A)

1-2

B)

2-3

C)

3-4

D)

4-5

Correct Answer : 3-4

Explanation : This type of cement was first of all developed in U.S.A. It is recommended that air contents should be 03-04 % by volume.

292 .

Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by __________

A)

IS 456-2010

B)

IS 456-2000

C)

IS 465-2000

D)

IS 513-1999

Correct Answer : IS 456-2000

Explanation : Option can be eliminated because there is no such code. Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by IS 456:2000.

293 .

Which of the following compound is used for fine polishing?

A)

Nitric oxide

B)

Iron oxide

C)

Silicon carbide

D)

Aluminum oxide

Correct Answer : Aluminum oxide

Explanation : Powder form of aluminum oxide is used for fine polishing process. It is surface treatment process.