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Mechanical Engineering : Strength of Materials - Quiz(MCQ)
1 .
The bending moment at the free end of a cantilever beam is
A)
zero
B)
minimum
C)
maximum
D)
None of the above

Correct Answer :   zero

2 .
The hoop stress in a thick cylindrical shell is maximum at the inner radius.
A)
True
B)
False
C)
Can not say
D)
None of the above

Correct Answer :   True

3 .
The shear force diagram fora cantilever beam of length l and carrying a gradually varying load from zero at free end and w per unit length at the fixed end is a
A)
inclined line
B)
vertical straight line
C)
parabolic curve
D)
horizontal straight line

Correct Answer :   parabolic curve

4 .
When one plate overlaps the other and the two plates are riveted together with two rows of rivets, the joint is known as
A)
single riveted lap joint
B)
double riveted lap joint
C)
double riveted single cover butt joint
D)
double riveted double cover butt joint

Correct Answer :   double riveted lap joint

5 .
The strength of the un-riveted or solid plate per pitch length is
A)
(p - d)t.σt
B)
Ï€/2 x d2 x Ï„
C)
d.t.σc
D)
p.t.σt

Correct Answer :   p.t.σt

6 .
For long columns, thevalue of buckling load is __________ crushing load.
A)
equal to
B)
less than
C)
more than
D)
None of the above

Correct Answer :   less than

7 .
For the beam shown in the below figure, the shear force diagram between A and B is
A)
a vertical line
B)
an inclined line
C)
a parabolic curve
D)
a horizontal line

Correct Answer :   a parabolic curve

8 .
In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress across the thickness of a cylinder is
A)
maximum at the inner surface and minimum at the outer surface
B)
maximum at the outer surface and zero at the inner surface
C)
maximum at the inner surface and zero at the outer surface
D)
maximum at the outer surface and minimum at the inner surface

Correct Answer :   maximum at the inner surface and minimum at the outer surface

9 .
The bending moment diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, will be
A)
a vertical line
B)
an inclined line
C)
a parabolic curve
D)
a horizontal line

Correct Answer :   a parabolic curve

10 .
In case of an over-reinforced beam, the depth of actual neutral axis is the same as that of the critical neutral axis.
A)
True
B)
False
C)
Can not say
D)
None of the above

Correct Answer :   False

11 .
The thickness of a thin cylindrical shell with hemispherical ends is __________ that of spherical ends.
A)
equal to
B)
less than
C)
more than
D)
None of the above

Correct Answer :   more than

12 .
The assumption made in Euler's column theory is that
A)
the column material obeys Hooke's law
B)
the failure of column occurs due to buckling alone
C)
the length of column is very large as compared to its cross-sectional dimensions
D)
All of the above

Correct Answer :   All of the above

13 .
When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as __________ double cover butt joint.
A)
double riveted
B)
single riveted
C)
Can not Say
D)
None of the above

Correct Answer :   double riveted

14 .
Whenever a material is loaded within elastic limit, stress is__________strain.
A)
directly proportional to
B)
equal to
C)
inversely proportional to
D)
None of the above

Correct Answer :   directly proportional to

15 .
In a beam of uniform strength, the bending stress developed is constant and is equal to the allowable stress at every section of the beam.
A)
True
B)
False
C)
Can not say
D)
None of the above

Correct Answer :   True

16 .
The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is __________ at the fixed end.
A)
wl
B)
wl/2
C)
wl/4
D)
wl²/2

Correct Answer :   wl²/2

17 .
Two shafts 'A' and 'B' are made of same material. The shaft 'A' is of diameter D and shaft 'B' is of diameter D/2. The strength of shaft 'B' is __________ as that of shaft 'A'
A)
one-fourth
B)
one-eighth
C)
one-half
D)
four times

Correct Answer :   one-eighth

18 .
A body is subjected to a direct tensile stress (σ) in one plane. The shear stress is maximum at a section inclined at __________ to the normal of the section.
A)
45° and 90°
B)
45° and 135°
C)
30° and 135°
D)
60° and 150°

Correct Answer :   45° and 135°

19 .
The bending moment on a section is maximum where shear force is
A)
zero
B)
minimum
C)
maximum
D)
changing sign

Correct Answer :   changing sign

20 .
In a stress-strain diagram for mild steel, as shown in the below figure, the point A represents
A)
elastic limit
B)
breaking point
C)
lower yield point
D)
upper yield-point

Correct Answer :   elastic limit

21 .
The tensile test is carried on __________ materials.
A)
brittle
B)
plastic
C)
ductile
D)
malleable

Correct Answer :   ductile

22 .
The maximum shear stress in a thin cylindrical shell subjected to internal pressure p is
A)
pd/t
B)
pd/2t
C)
pd/4t
D)
pd/8t

Correct Answer :   pd/8t

23 .
When a shaft, is subjected to torsion, the shear stress induced in the shaft varies from
A)
zero at the centre to maximum at the circumference
B)
maximum at the centre to zero at the circumference
C)
minimum at the centre to maximum at the circumference
D)
maximum at the centre to minimum at the circumference

Correct Answer :   zero at the centre to maximum at the circumference

24 .
The maximum bending moment for a simply supported beam with a gradually varying load from zero at both ends and w per metre at the centre, lies at the centre of a beam.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

25 .
A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum shear stress will be
A)
400 MPa
B)
500 MPa
C)
900 MPa
D)
1400 MPa

Correct Answer :   500 MPa

26 .
A shaft of diameter D is subjected to a twisting moment (T) and a bending moment (M). If the maximum bending stress is equal to maximum shear stress developed, then M is equal to
A)
T
B)
2T
C)
4T
D)
T/2

Correct Answer :   T/2

27 .
Young's modulus may be defined as the ratio of
A)
shear stress to shear strain
B)
linear stress to lateral strain
C)
linear stress to linear strain
D)
lateral strain to linear strain

Correct Answer :   linear stress to linear strain

28 .
In the below figure, __________ represents glass.
A)
curve A
B)
curve B
C)
curve C
D)
curve D

Correct Answer :   curve C

29 .
Which of the following statement is correct?
A)
The size of hole drilled in riveting plates is less than the actual size of rivet.
B)
Rivets are generally specified by its shank diameter.
C)
The centre to centre distance between two consecutive rivets in a row is called margin.
D)
Tearing of plates can be avoided by taking the pitch of rivets equal to 1.5 times the diameter of rivet hole.

Correct Answer :   Rivets are generally specified by its shank diameter.

30 .
A pressure vessel is said to be a thin shell when the ratio of wall thickness of the vessel to its diameter is __________ 1/10.
A)
less than
B)
equal to
C)
greater than
D)
None of the above

Correct Answer :   less than

31 .
A tensile test is performed on a mild steel round bar. Its diameter after fracture will
A)
increase
B)
decrease
C)
remain same
D)
depend upon rate of loading

Correct Answer :   decrease

32 .
Two closely coiled helical springs 'A' and 'B' are equal in all respects but the diameter of wire of spring 'A' is double that of spring 'B' The stiffness of spring 'B' will be __________ that of spring 'A'
A)
one-half
B)
one-fourth
C)
one-eighth
D)
one-sixteenth

Correct Answer :   one-sixteenth

33 .
The strain energy stored in a body, when suddenly loaded, is __________ the strain energy stored when same load is applied gradually.
A)
equal to
B)
one-half
C)
twice
D)
four times

Correct Answer :   four times

34 .
The shear force at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre, is
A)
zero
B)
wl/2
C)
wl/4
D)
wl²/2

Correct Answer :   zero

35 .
According to Unwin's formula, the relation between diameter of rivet hole (d) and thickness of plate (t) is given by (where d and t are in mm)
A)
d = t
B)
d = 2t
C)
d = 6 √t
D)
d = 1.6 √t

Correct Answer :   d = 6 √t

36 .
Compression members always tend to buckle in the direction of the
A)
axis of load
B)
least radius of gyration
C)
minimum cross section
D)
perpendicular to the axis of load

Correct Answer :   least radius of gyration

37 .
The maximum tangential stress in a thick cylindrical shell is always __________ the internal pressure acting on the shell.
A)
equal to
B)
less than
C)
greater than
D)
None of the above

Correct Answer :   greater than

38 .
A thin spherical shell of diameter (d) and thickness (t) is subjected to an internal pressure (p). The stress in the shell material is
A)
pd/t
B)
pd/2t
C)
pd/4t
D)
pd/8t

Correct Answer :   pd/4t

39 .
Rivets are generally specified by
A)
shank diameter
B)
overall length
C)
diameter of head
D)
thickness of plates to be joined

Correct Answer :   shank diameter

40 .
Principle plane is a plane on which the shear stress is
A)
zero
B)
minimum
C)
maximum
D)
None of the above

Correct Answer :   zero

41 .
The lower layer of the beam as shown in the below figure, will be
A)
in tension
B)
in compression
C)
neither in tension nor in compression
D)
None of the above

Correct Answer :   in tension

42 .
When a body is subjected to a direct tensile stress (σ) in one plane, then normal stress on an oblique section of the body inclined at an angle θ to the normal of the section is
A)
σ sin θ
B)
σ cos² θ
C)
σ cos θ
D)
σ sin² θ

Correct Answer :   σ cos² θ

43 .
The columns whose slenderness ratio is less than 80, are known as
A)
long columns
B)
weak columns
C)
short columns
D)
medium columns

Correct Answer :   short columns

44 .
Within elastic limit, shear stress is __________ shear strain.
A)
equal to
B)
less than
C)
directly proportional to
D)
inversely proportional to

Correct Answer :   directly proportional to

45 .
Modular ratio of the two materials is the ratio of
A)
their modulus of rigidities
B)
shear stress to shear strain
C)
linear stress to linear strain
D)
their modulus of elasticities

Correct Answer :   their modulus of elasticities

46 .
When a beam is subjected to a bending moment, the strain in a layer is __________ the distance from the neutral axis.
A)
equal to
B)
independent of
C)
directly proportional to
D)
inversely proportional to

Correct Answer :   directly proportional to

47 .
The thermal or temperature stress is a function of
A)
modulus of elasticity
B)
increase in temperature
C)
coefficient of linear expansion
D)
All of the above

Correct Answer :   All of the above

48 .
The breaking stress is __________ the ultimate stress.
A)
equal to
B)
less than
C)
greater than
D)
None of the above

Correct Answer :   less than

49 .
A bolt is made to pass through a tube and both of them are tightly fitted with the help of washers and nuts. If the nut is tightened, then
A)
bolt is Under tension and tube is under compression
B)
bolt arid tube are under tension
C)
bolt and tube are under compression
D)
bolt is under compression and tube is under tension

Correct Answer :   bolt is Under tension and tube is under compression

50 .
The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (σx and σy) acting at a body across two mutually perpendicular planes. The resultant stress is given by
A)
OC
B)
OP
C)
OQ
D)
PQ

Correct Answer :   OP

51 .
A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The minimum normal stress will be
A)
400 MPa
B)
500 MPa
C)
900 MPa
D)
1400 MPa

Correct Answer :   400 MPa

52 .
Which of the following statement is correct?
A)
The strain is expressed in mm.
B)
The stress is the pressure per unit area.
C)
Hook's law holds good upto the breaking point.
D)
Stress is directly proportional to strain within elastic limit.

Correct Answer :   Stress is directly proportional to strain within elastic limit.

53 .
The volumetric strain is the ratio of the
A)
original volume to the change in volume
B)
original thickness to the change in thickness
C)
change in volume to the original volume
D)
change in thickness to the original thickness

Correct Answer :   change in volume to the original volume

54 .
A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum shear stress will be
A)
-100 MPa
B)
250 MPa
C)
300 MPa
D)
400 MPa

Correct Answer :   250 MPa

55 .
In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress is always a tensile stress where as the radial stress is a compressive stress
A)
Correct
B)
Incorrect
C)
Can not say
D)
None of the above

Correct Answer :   Correct

56 .
A column that fails due to direct stress, is called
A)
short column
B)
long column
C)
weak column
D)
medium column

Correct Answer :   short column

57 .
The thermal stress __________ upon the cross-sectional area of the bar.
A)
depends
B)
does not depend
C)
Can not say
D)
None of the above

Correct Answer :   does not depend

58 .
A thin cylindrical shell of diameter (d) length (l) and thickness (t) is subjected to an internal pressure (p). The longitudinal stress in the shell is
A)
pd/t
B)
pd/2t
C)
pd/4t
D)
pd/6t

Correct Answer :   pd/4t

59 .
A beam encastered at both the ends is called
A)
fixed beam
B)
cantilever beam
C)
continuous beam
D)
simply supported beam

Correct Answer :   fixed beam

60 .
If the section modulus of a beam is increased, the bending stress in the beam will
A)
increase
B)
decrease
C)
not change
D)
None of the above

Correct Answer :   decrease

61 .
The limit of eccentricity for no tensile conditions for a column of circular section of diameter (d) is
A)
d/4
B)
d/8
C)
d/12
D)
d/16

Correct Answer :   d/8

62 .
The bending moment at the ends of a simply supported beam will be zero.
A)
YEs
B)
No
C)
Can not say
D)
None of the above

Correct Answer :   Yes

63 .
The bending moment of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length is __________ at the free end.
A)
wl
B)
wl/2
C)
wl/4
D)
zero

Correct Answer :   zero

64 .
The ultimate tensile stress for mild steel is __________ the ultimate compressive stress.
A)
equal to
B)
less than
C)
more than
D)
None of the above

Correct Answer :   more than

65 .
The direct stress induced in a long column is __________ as compared to bending stress.
A)
less
B)
same
C)
more
D)
negligible

Correct Answer :   negligible

66 .
The shear force of a cantilever beam of length l carrying a uniformly distributed load of w per unit length is __________ at the free end.
A)
zero
B)
wl
C)
wl/2
D)
wl/4

Correct Answer :   zero

67 .
Hook's law holds good up to
A)
yield point
B)
elastic limit
C)
plastic limit
D)
breaking point

Correct Answer :   elastic limit

68 .
The shear force at the ends of a simply supported beam carrying a uniformly distributed load of w per unit length is
A)
zero at its both ends
B)
wl at one end and - wl at the other end
C)
wl/2 at one end and - wl/2 at the other end
D)
wl²/2 at one end and - wl²/2 at the other end

Correct Answer :   wl/2 at one end and - wl/2 at the other end

69 .
The maximum shear stress is __________ the algebraic difference of maximum and minimum normal stresses.
A)
twice
B)
one-half
C)
equal to
D)
one-fourth

Correct Answer :   one-half

70 .
In a watch, the spring is used to store strain energy. This energy is released
A)
to run the watch
B)
to stop the watch
C)
to change the time
D)
All of the above

Correct Answer :   to run the watch

71 .
A flitched beam is used to
A)
change the shape of the beam
B)
effect the saving in material
C)
increase the cross-section of the beam
D)
equalise the strength in tension and compression

Correct Answer :   equalise the strength in tension and compression

72 .
The ratio of the lateral strain to the linear strain is called
A)
bulk modulus
B)
Poisson's ratio
C)
modulus of rigidity
D)
modulus of elasticity

Correct Answer :   Poisson's ratio

73 .
A closely-coiled helical spring of stiffness k is cut into (n) equal parts. The stiffness in each part of the spring will be
A)
nk
B)
nk²
C)
n√k
D)
k√n

Correct Answer :   nk

74 .
Which of the following statement is correct?
A)
The proof resilience per unit volume of a material is known as modulus of resilience.
B)
The maximum strain energy which can be stored in a body is termed as proof resilience.
C)
The energy stored in a body, when strained within elastic limit is known as strain energy.
D)
All of the above

Correct Answer :   All of the above

75 .
If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is
A)
0.20
B)
0.30
C)
0.50
D)
0.80

Correct Answer :   0.50

76 .
The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam 'B' will be __________ as compared to beam A.
A)
same
B)
double
C)
four times
D)
six times

Correct Answer :   double

77 .
In a simple bending of beams, the stress in the beam varies
A)
elliptically
B)
parabolically
C)
linearly
D)
hyperbolically

Correct Answer :   linearly

78 .
The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called
A)
elastic limit
B)
ultimate point
C)
breaking point
D)
yield point

Correct Answer :   yield point

79 .
If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to (where M = Bending moment)
A)
M
B)
√M
C)
M²
D)
M³

Correct Answer :   M

80 .
A concentrated load is one which
A)
acts at a point on a beam
B)
varies uniformly over the whole length of a beam
C)
spreads uniformly over the whole length of a beam
D)
spreads non-uniformly over the whole length of a beam

Correct Answer :   acts at a point on a beam

81 .
The bending stress in a beam is __________ section modulus.
A)
directly proportional to
B)
inversely proportional to
C)
Can not say
D)
None of the above

Correct Answer :   inversely proportional to

82 .
When shear force at a point is zero, then bending moment is __________ at that point.
A)
zero
B)
minimum
C)
maximum
D)
infinity

Correct Answer :   maximum

83 .
When a bar is cooled to - 5°C, it will develop
A)
tensile stress
B)
shear stress
C)
compressive stress
D)
None of the above

Correct Answer :   tensile stress

84 .
Factor of safety is defined as the ratio of
A)
working stress to ultimate stress
B)
breaking stress to ultimate stress
C)
ultimate stress to breaking stress
D)
ultimate stress to working stress

Correct Answer :   ultimate stress to working stress

85 .
The value of equivalent length is taken to be half of the actual length of a column with one end fixed and the other end free.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Disagree

86 .
The shear force diagram of a cantilever beam of length l and carrying a uniformly distributed load of w per unit length will be
A)
a rectangle
B)
an issoscles triangle
C)
an equilateral triangle
D)
a right angled triangle

Correct Answer :   a right angled triangle

87 .
Whenever some external system of forces acts on a body, it undergoes some deformation. As the body undergoes some deformation, it sets up some resistance to the deformation. This resistance per unit area to deformation, is called
A)
strain
B)
pressure
C)
stress
D)
modulus of elasticity

Correct Answer :   stress

88 .
Two solid shafts 'A' and 'B' are made of the same material. The shaft 'A' is of 50 mm diameter and shaft 'B' is of 100 mm diameter. The strength of shaft 'B' is __________ as that of shaft A.
A)
double
B)
one-half
C)
four times
D)
eight times

Correct Answer :   eight times

89 .
In calculating the strength of a riveted joint in tearing, shearing and crushing, the
A)
actual diameter of rivet is used
B)
mean diameter of hole drilled and rivet is used
C)
actual diameter of hole drilled for rivet is used
D)
smaller of the rivet diameter and hole diameter is used

Correct Answer :   actual diameter of hole drilled for rivet is used

90 .
Fatigue test is carried out for
A)
stresses varying between two limits of unequal value but of same sign
B)
stresses varying between two limits of equal value, but of opposite sign
C)
stresses varying between two limits of unequal value, but of opposite sign
D)
All of the above

Correct Answer :   All of the above

91 .
The section modulus (Z) of a beam is given by
A)
I/y
B)
I.y
C)
y/I
D)
M/I

Correct Answer :   I/y

92 .
When a bar of length l, width b and thickness t is subjected to a push of P, its
A)
length, width and thickness increases
B)
length, width and thickness decreases
C)
length decreases, width and tickness increases
D)
length increases, width and thickness decreases

Correct Answer :   length decreases, width and tickness increases

93 .
When a thin cvlindrical shell is subjected to an internal pressure, the volumetric strain is (where ε1 = Hoop strain, and ε2 = Longitudinal strain)
A)
2ε2 - ε1
B)
2ε1 + ε2
C)
2ε1 - ε2
D)
2ε2 + ε1

Correct Answer :   2ε1 + ε2

94 .
Mohr's circle is used to determine the stresses on an oblique section of a body subjected to
A)
direct tensile stress in two mutually perpendicular directions
B)
direct tensile stress in one plane accompanied by a shear stress
C)
direct tensile stress in two mutually perpendicular directions accompanied by a simple shear stress
D)
All of the above

Correct Answer :   All of the above

95 .
The maximum shear stress developed in a beam of rectangular section is __________ the average shear stress.
A)
4/3 times
B)
1.5 times
C)
twice
D)
equal to

Correct Answer :   1.5 times

96 .
The relation between equivalent length (L) and actual length (l) of a column for one end fixed and the other end hinged is
A)
L = l/√2
B)
L = l
C)
L = 4l
D)
L = l/2

Correct Answer :   L = l/√2

97 .
The total strain energy stored in a body is called proof resilience.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Disagree

98 .
The thermal stress in a bar is __________ proportional to the change in temperature.
A)
directly
B)
indirectly
C)
Can not say
D)
None of the above

Correct Answer :   directly

99 .
The section modulus of a circular section about an axis through its C.G., is
A)
πd²/4
B)
πd²/16
C)
πd³/16
D)
πd³/32

Correct Answer :   Ï€d³/32

100 .
In the above question, the normal stress on an oblique section will be maximum, when θ is equal to
A)
0°
B)
30°
C)
45°
D)
90°

Correct Answer :   0°

101 .
The bending moment in the centre of a simply supported beam carrying a uniformly distributed load of w per unit length is
A)
zero
B)
wl²/2
C)
wl²/4
D)
wl²/8

Correct Answer :   wl²/8

102 .
The point of contraflexure occurs in
A)
fixed beams
B)
overhanging beams
C)
cantilever beams
D)
simply supported beams

Correct Answer :   overhanging beams

103 .
The shear force at apoint on a beam is the algebraic __________ of all the forces on either side of the point.
A)
sum
B)
difference
C)
Can not say
D)
None of the above

Correct Answer :   sum

104 .
When a thin cylindrical shell is subjected to an internal pressure, there will be
A)
a decrease in diameter and length of the shell
B)
a decrease in diameter and increase in length of the shell
C)
an increase in diameter and length of the shell
D)
an increase in diameter and decrease in length of the shell

Correct Answer :   an increase in diameter and length of the shell

105 .
A welded joint as compared to a riveted joint has __________ strength.
A)
less
B)
same
C)
more
D)
None of the above

Correct Answer :   more

106 .
In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the
A)
normal stress varies linearly in the material
B)
normal stress remains constant in all directions
C)
elastic constants varies linearly in the material
D)
elastic constants are same in all the directions

Correct Answer :   elastic constants are same in all the directions

107 .
A beam of uniform strength has
A)
same shear stress at every section
B)
same bending stress at every section
C)
same bending moment at every section
D)
same cross-section throughout the beam

Correct Answer :   same bending stress at every section

108 .
For a 25 mm hole drilled in plates, the diameter of rivet shank should be
A)
23mm
B)
24.5mm
C)
25mm
D)
26mm

Correct Answer :   23mm

109 .
The extremeties of any diameter on Mohr's circle represent
A)
principal stresses
B)
shear stresses on planes at 45°
C)
normal stresses on planes at 45°
D)
normal and shear stresses on a plane

Correct Answer :   normal stresses on planes at 45°

110 .
Two shafts 'A' and 'B' are made of same material. The shaft 'A' is solid and has diameter D. The shaft 'B' is hollow with outer diameter D and inner diameter D/2. The strength of hollow shaft in torsion is __________ as that of solid shaft.
A)
1/4
B)
1/8
C)
1/16
D)
15/16

Correct Answer :   15/16

111 .
The product of Young's modulus (E) and moment of inertia (I) is known as
A)
bulk modulus
B)
flexural rigidity
C)
torsional rigidity
D)
modulus of rigidity

Correct Answer :   flexural rigidity

112 .
The relation between equivalent length (L) and actual length (l) of a column for both ends fixed is
A)
L = l
B)
L = 2l
C)
L = l/2
D)
L = l/√2

Correct Answer :   L = l/2

113 .
The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional area is
A)
1
B)
2/3
C)
3/4
D)
9/8

Correct Answer :   9/8

114 .
A beam of triangular section is placed with its base horizontal. The maximum shear stress occurs at
A)
mid of the height
B)
base of the triangle
C)
apex of the triangle
D)
centre of gravity of the triangle

Correct Answer :   mid of the height

115 .
Transverse fillet welds are designed for
A)
shear strength
B)
bending strength
C)
tensile strength
D)
compressive strength

Correct Answer :   tensile strength

116 .
The maximum shear stress in a thin spherical shell subjected to an internal pressure (p) is zero.
A)
Yes
B)
No
C)
Can not say
D)
None of the above

Correct Answer :   Yes

117 .
The assumption, generally, made in the theory of simple bending is that
A)
the beam material is stressed within its elastic limit
B)
the beam material is perfectly homogenous and isotropic
C)
the plane sections before bending remain plane after bending
D)
All of the above

Correct Answer :   All of the above

118 .
The shear force of a cantilever beam of length l carrying a uniformly distributed load of w per unit length is __________ at the fixed end.
A)
wl
B)
wl/2
C)
wl/4
D)
Zero

Correct Answer :   wl

119 .
In the below figure, stress is proportional to strain, for the portion
A)
from O to A
B)
from A to C
C)
from A to D
D)
from D to E

Correct Answer :   from O to A

120 .
The design of thin cylindrical shells is based on
A)
longitudinal stress
B)
hoop stress
C)
geometric mean of the hoop and longitudinal stress
D)
arithmetic mean of the hoop and the longitudinal stress

Correct Answer :   hoop stress

121 .
The pull required to crush the rivet per pitch length is
A)
d.t.σc
B)
p.t.σt
C)
π/4 x d² x σt
D)
π/4 x d² x σc

Correct Answer :   d.t.σc

122 .
The deformation of the bar per unit length in the direction of the force is known as
A)
shear strain
B)
lateral strain
C)
linear strain
D)
volumetric strain

Correct Answer :   linear strain

123 .
A beam of uniform strength may be obtained by
A)
keeping the width uniform and varying the depth
B)
keeping the depth uniform and varying the width
C)
varying the width and depth both
D)
any one of the above

Correct Answer :   any one of the above

124 .
Parallel fillet welds are designed for bending strength.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

125 .
The maximum deflection of a fixed beam carrying a central point load lies at
A)
fixed ends
B)
centre of beam
C)
l/3 from fixed ends
D)
None of the above

Correct Answer :   centre of beam

126 .
The springs in brakes and clutches are used to
A)
to measure forces
B)
to absorb shocks
C)
to apply forces
D)
to store strain energy

Correct Answer :   to apply forces

127 .
A beam of T-section is subjected to a shear force of F. The maximum shear force will occur at the
A)
top of the section
B)
bottom of the section
C)
junction of web and flange
D)
neutral axis of the section

Correct Answer :   neutral axis of the section

128 .
Two bars of different materials and same size are subjected to the same tensile force. If the bars have unit elongation in the ratio of 2:5, then the ratio of modulus of elasticity of the two materials will be
A)
2:5
B)
3:4
C)
4:3
D)
5:2

Correct Answer :   5:2

129 .
A double strap butt joint with equal straps is
A)
always in single shear
B)
always in double shear
C)
either in single shear or double shear
D)
None of the above

Correct Answer :   always in double shear

130 .
At the neutral axis of a beam
A)
the layers do not undergo any strain
B)
the layers are subjected to compression
C)
the layers are subjected to maximum bending stress
D)
the layers are subjected to minimum bending stress

Correct Answer :   the layers do not undergo any strain

131 .
In a thick cylindrical shell subjected to an internal pressure (p), the maximum radial stress at the inner surface of the shell is
A)
zero
B)
p (tensile)
C)
2p (tensile)
D)
-p (compressive)

Correct Answer :   -p (compressive)

132 .
Shear strength of the welded joint for double parallel fillet is (where Ï„ = Allowable shear stress for weld metal)
A)
s.l.Ï„
B)
2.s.l.Ï„
C)
√2 s.l.τ
D)
0.5 s.l.Ï„

Correct Answer :   √2 s.l.Ï„

133 .
A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be
A)
zero
B)
shear
C)
tensile
D)
compressive

Correct Answer :   compressive

134 .
In the below figure, the point C represents
A)
elastic limit
B)
lower yield point
C)
upper yield point
D)
breaking point

Correct Answer :   lower yield point

135 .
Two closely-coiled helical springs 'A' and 'B' of the same matenal, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be
A)
2
B)
4
C)
1/4
D)
1/8

Correct Answer :   1/8

136 .
Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is __________ as that of shaft 'A'.
A)
1/4
B)
1/6
C)
1/8
D)
15/16

Correct Answer :   15/16

137 .
The tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and σt = Allowable tensile stress for weld metal)
A)
s.l.σt
B)
√2 s.l.σt
C)
2.s.l.σt
D)
0.5 s.l.σt

Correct Answer :   √2 s.l.σt

138 .
The direct stress, across a principal plane, is known as principal stress.
A)
Yes
B)
No
C)
Can not say
D)
None of the above

Correct Answer :   Yes

139 .
On one side of a neutral axis of a beam, there is a tensile stress and on the other side of the beam there is a compressive stress.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

140 .
A reinforced cement concrete beam is considered to be made of
A)
isotropic material
B)
hetrogeneous material
C)
composite material
D)
homogeneous material

Correct Answer :   hetrogeneous material

141 .
The radius of the Mohr 's circle in the given figure is equal to
A)
sum of two principal stresses
B)
difference of two principal stresses
C)
half the sum of two principal stresses
D)
half the difference of two principal stresses

Correct Answer :   half the difference of two principal stresses

142 .
The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be
A)
1
B)
1/3
C)
2/3
D)
3/2

Correct Answer :   2/3

143 .
The bending moment diagram for a cantilever beam of length l and carrying a gradually varying load from zero at the free end and w per unit length at the fixed end is a parabolic curve.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

144 .
Shear modulus is the ratio of
A)
linear stress to linear strain
B)
linear stress to lateral strain
C)
volumetric strain to linear strain
D)
shear stress to shear strain

Correct Answer :   shear stress to shear strain

145 .
The assumption made in the theory of the reinforced cement concrete beam is that
A)
there is a sufficient bond between steel and concrete
B)
the steel and concrete are stressed within its elastic limit
C)
all the tensile stresses are taken up by the steel reinforcement only
D)
All of the above

Correct Answer :   All of the above

146 .
The steel bars in a reinforced cement concrete beam are embedded __________ of the beam.
A)
near the bottom
B)
near the top
C)
in the centre
D)
at any position

Correct Answer :   near the bottom

147 .
When there is a sudden increase or decrease in shear force diagram between any two points, it indicates that there is a
A)
no loading between the two points
B)
point load at the two points
C)
uniformly varying load between the two points
D)
uniformly distributed load between the two points

Correct Answer :   point load at the two points

148 .
In case of eccentrically loaded struts __________ is preferred.
A)
solid section
B)
hollow section
C)
composite section
D)
reinforced section

Correct Answer :   composite section

149 .
In a stress-strain diagram as shown in the below figure, the curve A represents
A)
soft brass
B)
mild steel
C)
low carbon steel
D)
cold rolled steel

Correct Answer :   soft brass

150 .
A leaf spring is supported at the
A)
centre and loaded at the ends
B)
ends and loaded anywhere
C)
centre and loaded anywhere
D)
ends and loaded at the centre

Correct Answer :   centre and loaded at the ends

151 .
The unit of stress in S.I. units is______.
A)
N/m²
B)
N/mm²
C)
kN/mm²
D)
Any one of these

Correct Answer :   Any one of these

152 .
The modulus of elasticity for mild steel is approximately equal to
A)
10 kN/mm²
B)
80 kN/mm²
C)
100 kN/mm²
D)
210 kN/mm²

Correct Answer :   210 kN/mm²

153 .
The Rankine's formula holds good for
A)
short columns
B)
long columns
C)
Both (A) and (B)
D)
weak columns

Correct Answer :   Both (A) and (B)

154 .
In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.
A)
less than
B)
greater than
C)
same as
D)
None of the above

Correct Answer :   less than

155 .
The maximum shear stress developed in a beam of circular section is __________ the average shear stress.
A)
1.5 times
B)
4/3 times
C)
twice
D)
equal to

Correct Answer :   4/3 times

156 .
A rectangular beam of length l supported at its two ends carries a central point load W. The maximum deflection occurs
A)
at the ends
B)
at the centre
C)
at l/3 from both ends
D)
None of the above

Correct Answer :   at the centre

157 .
For no tension condition in the base of a short column of circular section, the line of action of the load should be within a circle of diameter equal to __________ of the main circle.
A)
one-half
B)
one-third
C)
one-eighth
D)
one-fourth

Correct Answer :   one-fourth

158 .
When a body is subjected to a direct tensile stress (σ) in one plane, then maximum normal stress occurs at a section inclined at __________ to the normal of the section.
A)
0°
B)
30°
C)
45°
D)
90°

Correct Answer :   0°

159 .
The point of contraflexure is a point where
A)
shear force is maximum
B)
shear force changes sign
C)
bending moment changes sign
D)
bending moment is maximum

Correct Answer :   bending moment changes sign

160 .
The simply supported beam 'A' of length l carries a central point load W. Another beam 'B' is loaded with a uniformly distributed load such that the total load on the beam is W. The ratio of maximum deflections between beams A and B is
A)
4/5
B)
5/4
C)
5/8
D)
8/5

Correct Answer :   8/5

161 .
In compression test, the fracture in cast iron specimen would occur along
A)
an oblique plane
B)
would not occur
C)
the axis of load
D)
at right angles to the axis of specimen

Correct Answer :   an oblique plane

162 .
The maximum stress produced in a bar of tapering section is at
A)
middle
B)
smaller end
C)
larger end
D)
Anywhere

Correct Answer :   smaller end

163 .
The energy stored in a body when strained within elastic limit is known as
A)
resilience
B)
impact energy
C)
proof resilience
D)
strain energy

Correct Answer :   strain energy

164 .
Strain rosettes are used to
A)
relieve strain
B)
measure shear strain
C)
measure volumetric strain
D)
measure linear strain

Correct Answer :   measure linear strain

165 .
When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the
A)
neutral axis
B)
top layer
C)
bottom layer
D)
every cross-section

Correct Answer :   bottom layer

166 .
The bending moment at a point on a beam is the algebraic ______ of all the moments on either side of the point.
A)
sum
B)
difference
C)
Can not say
D)
None of the above

Correct Answer :   sum

167 .
The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
A)
t
B)
2t
C)
4t
D)
8t

Correct Answer :   4t

168 .
Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is
A)
1/2
B)
1/4
C)
1/8
D)
2

Correct Answer :   1/2

169 .
The deformation per unit length is called
A)
shear stress
B)
strain
C)
tensile stress
D)
compressive stress

Correct Answer :   strain

170 .
If the slenderness ratio for a column is 100, then it is said to be a __________ column.
A)
long
B)
short
C)
medium
D)
None of the above

Correct Answer :   long

171 .
When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is compressive.
A)
True
B)
False
C)
Can not say
D)
None of the above

Correct Answer :   True

172 .
In order to prevent crushing of masonry at the base of the dam, the maximum stress should be ______ the permissible stress of the soil.
A)
equal to
B)
less than
C)
more than
D)
None of the above

Correct Answer :   less than

173 .
A masonry dam may fail due to
A)
overturning of the dam
B)
crushing of masonry at the base of the dam
C)
tension in the masonry of the dam and its base
D)
any one of the above

Correct Answer :   any one of the above

174 .
When a rectangular beam is loaded transversely, the maximum tensile stress is developed on the
A)
top layer
B)
bottom layer
C)
neutral axis
D)
every cross-section

Correct Answer :   top layer

175 .
The compressive strength of brittle materials is ________ its tensile strength.
A)
equal to
B)
greater than
C)
less than
D)
None of the above

Correct Answer :   less than

176 .
In spring balances, the spring is used
A)
to apply forces
B)
to absorb shocks
C)
to measure forces
D)
to store strain energy

Correct Answer :   to measure forces

177 .
According to Euler's column theory, the crippling load of a column is given by p = π2 EI/Cl2. In the Euler's formula, the value of C for a column with both ends fixed is 4.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

178 .
The stress developed in the material without any permanent set is called
A)
yield stress
B)
elastic limit
C)
breaking stress
D)
ultimate stress

Correct Answer :   elastic limit

179 .
When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is
A)
shear stress
B)
tensile stress
C)
compressive stress
D)
thermal stress

Correct Answer :   thermal stress

180 .
For a given stress, the ratio of moment of resistance of a beam of square cross-section when placed with its two sides horizontal to the moment of resistance with its diagonal horizontal, is
A)
1
B)
1/2
C)
√2
D)
1/√2

Correct Answer :   √2

181 .
The Young's modulus of a material is 125 GPa and Poissons ratio is 0.25. The modulus of rigidity of me material is
A)
50 GPa
B)
80 GPa
C)
100 GPa
D)
150 GPa

Correct Answer :   50 GPa

182 .
The layer at the centre of gravity of the beam as shown in the below figure, will be
A)
in tension
B)
in compression
C)
neither in tension nor in compression
D)
None of the above

Correct Answer :   neither in tension nor in compression

183 .
If the modulus of elasticity for a given material is twice its modulus of rigidity, then bulk modulus is equal to
A)
2C
B)
3C
C)
2C/3
D)
3C/3

Correct Answer :   2C/3

184 .
A beam which is fixed at one end and free at the other is called
A)
fixed beam
B)
cantilever beam
C)
overhanging beam
D)
simply supported beam

Correct Answer :   cantilever beam

185 .
When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as
A)
Poisson's ratio
B)
bulk modulus
C)
Young's modulus
D)
modulus of rigidity

Correct Answer :   bulk modulus

186 .
The ratio of shear modulus to the modulus of elasticity for a Poisson's ratio of 0.4 will be
A)
5/7
B)
7/5
C)
5/14
D)
14/5

Correct Answer :   5/14

187 .
The bending moment at a section tends to bend or deflect the beam and the internal stresses resist its bending. The resistance offered by the internal stresses, to the bending, is called
A)
shear stress
B)
elastic modulus
C)
compressive stress
D)
bending stress

Correct Answer :   bending stress

188 .
The section modulus of a rectangular section about an axis through its C.G., is
A)
bd²/2
B)
b/2
C)
d/2
D)
bd²/6

Correct Answer :   bd²/2

189 .
The maximum shear stress is equal to the radius of Mohr's circle.
A)
Correct
B)
Incorrect
C)
Can not say
D)
None of the above

Correct Answer :   Correct

190 .
A closely coiled helical spring is of mean diameter (D) and spring wire diameter (d). The spring index is the ratio of
A)
1/d
B)
1/D
C)
d/D
D)
D/d

Correct Answer :   D/d

191 .
The rivets are used for __________ fastenings.
A)
temporary
B)
permanent
C)
Can not say
D)
None of the above

Correct Answer :   permanent

192 .
The strength of a riveted joint is equal to the
A)
minimum value of Pt, Ps or Pc
B)
pull required to crush the rivet per pitch length (Pc)
C)
pull required to tear off the plate per pitch length (Pt)
D)
pull required to shear off the rivet per pitch length (Ps)

Correct Answer :   minimum value of Pt, Ps or Pc

193 .
The neutral axis of the symmetrical beam does not pass through the centroid of the beam.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

194 .
The deformation of a bar under its own weight is ________ the deformation, if the same body is subjected to a direct load equal to weight of the body.
A)
double
B)
equal to
C)
half
D)
quadruple

Correct Answer :   half

195 .
The Poisson's ratio for steel varies from
A)
0.23 to 0.27
B)
0.27 to 0.30
C)
0.31 to 0.34
D)
0.32 to 0.42

Correct Answer :   0.27 to 0.30

196 .
Which of the following is a proper sequence?
A)
elastic limit, proportional limit, yielding, failure
B)
yielding, proportional limit, elastic limit, failure
C)
proportional limit, elastic limit, yielding, failure
D)
None of the above

Correct Answer :   proportional limit, elastic limit, yielding, failure

197 .
The neutral axis of a beam is subjected to __________ stress.
A)
zero
B)
minimum tensile
C)
maximum tensile
D)
maximum compressive

Correct Answer :   zero

198 .
When a load on the free end of a cantilever beam is increased, failure will occur
A)
at the free end
B)
at the fixed end
C)
in the middle of the beam
D)
at a distance 2l/3 from free end

Correct Answer :   at the fixed end

199 .
According to Euler's column theory, the crippling load of a column is given by p = π² EI/Cl² In this equation, the value of C for a column with both ends hinged, is
A)
1
B)
2
C)
1/2
D)
1/4

Correct Answer :   1

200 .
In a riveted joint, when the number of rivets decreases from the inner most row to outer most row, the joint is said to be
A)
chain riveted
B)
zig-zag riveted
C)
Both (A) and (B)
D)
diamond riveted

Correct Answer :   diamond riveted

201 .
A spring, when loaded, is permanently distorted and recover its original shape when the load is removed.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

202 .
The hoop stress in a thin cylindrical shell is
A)
radial stress
B)
compressive stress
C)
longitudinal stress
D)
circumferential tensile stress

Correct Answer :   circumferential tensile stress

203 .
The capacity of a strained body for doing work on the removal of the straining force, is called
A)
impact energy
B)
resilience
C)
strain energy
D)
proof resilience

Correct Answer :   resilience

204 .
When a rectangular beam is loaded longitudinally, the shear force develops on the top layer.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Disagree

205 .
The Poisson's ratio for cast iron varies from
A)
0.21 to 0.26
B)
0.31 to 0.34
C)
0.32 to 0.42
D)
0.33 to 0.37

Correct Answer :   0.21 to 0.26

206 .
The Rankine's theory for active earth pressure is based on the assumption that
A)
the retained material is homogeneous and cohesionless
B)
the failure of the retained material takes place along a plane called rupture plane
C)
the frictional resistance between the retaining wall and the retained material is neglected
D)
All of the above

Correct Answer :   All of the above

207 .
The strain energy stored in a spring, when subjected to maximum load, without suffering permanent distortion, is known as
A)
proof stress
B)
impact energy
C)
proof resilience
D)
modulus of resilience

Correct Answer :   proof resilience

208 .
The resultant stress on an inclined plane which is inclined at an angle θ to the normal cross-section of a body which is subjected to a direct tensile stress (σ) in one plane, is
A)
σ sin θ
B)
σ cos θ
C)
σ sin 2θ
D)
σ cos 2θ

Correct Answer :   σ cos θ

209 .
The ratio of change in volume to the original volume is called
A)
linear strain
B)
lateral strain
C)
Poisson's ratio
D)
volumetric strain

Correct Answer :   volumetric strain

210 .
In a beam where shear force changes sign, the bending moment will be
A)
zero
B)
maximum
C)
minimum
D)
infinity

Correct Answer :   maximum

211 .
The ductility of a material __________ with the increase in percentage reduction in area of a specimen under tensile test.
A)
increases
B)
decreases
C)
remains same
D)
None of the above

Correct Answer :   increases

212 .
The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and width but depth is double that of 'A'. The elastic strength of beam B will be __________ as compared to beam A.
A)
same
B)
double
C)
four times
D)
six times

Correct Answer :   four times

213 .
When a closely-coiled helical spring is subjected to an axial load, it is said to be under
A)
shear
B)
torsion
C)
crushing
D)
bending

Correct Answer :   torsion

214 .
The given figure shows the Mohr's circle of stress for two unequal and like principal stresses (σ<sub>x</sub> and σ<sub>y</sub>) acting at a body across two mutually perpendicular planes. The normal stress on an oblique section making an angle θ with the minor principle plane is given by
A)
OC
B)
OQ
C)
OP
D)
PQ

Correct Answer :   OQ

215 .
The maximum bending moment of a simply supported beam of span l and carrying a point load W at the centre of beam, is
A)
Wl
B)
Wl/2
C)
Wl/4
D)
Wl²/4

Correct Answer :   Wl/4

216 .
A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with one end fixed and the other end free.
A)
1/8
B)
1/4
C)
1/2
D)
1

Correct Answer :   l/4

217 .
The state of stress at a point in a loaded member is shown in the below figure. The magnitude of maximum shear stress is
A)
10 MPa
B)
30 MPa
C)
50 MPa
D)
100 MPa

Correct Answer :   50 MPa

218 .
When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off across the section, the stress and strain induced is
A)
shear stress, tensile strain
B)
tensile stress, tensile strain
C)
compressive stress, compressive strain
D)
shear stress, shear strain

Correct Answer :   shear stress, shear strain

219 .
A localised compressive stress at the area of contact between two members is known as
A)
shear stress
B)
tensile stress
C)
bending stress
D)
crushing stress

Correct Answer :   crushing stress

220 .
A section of beam is said to be in pure bending, if it is subjected to
A)
constant bending moment and zero shear force
B)
constant shear force and zero bending moment
C)
constant bending moment and constant shear force
D)
None of the above

Correct Answer :   constant bending moment and zero shear force

221 .
In a tensile test, when the material is stressed beyond elastic limit, the tensile strain __________ as compared to the stress.
A)
decreases slowly
B)
increases slowly
C)
increases more quickly
D)
decreases more quickly

Correct Answer :   increases more quickly

222 .
Two closely-coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is double that of spring 'B'. The stiffness of spring 'A' will be __________ that of spring 'B'.
A)
one-half
B)
one-fourth
C)
one-eighth
D)
one-sixteenth

Correct Answer :   one-half

223 .
A steel bar 2 m long, 20 mm wide and 10 mm thick is subjected to a pull of 2 kN. If the same bar is subjected to a push of 2 kN, the Poission's ratio of the bar in tension will be __________ the Poisson's ratio for the bar in compression.
A)
less than
B)
equal to
C)
greater than
D)
None of the above

Correct Answer :   equal to

224 .
A thin cylindrical shell of diameter (d), length (l) and thickness (t)is subjected to an internal pressure (p). The hoop stress in the shell is
A)
pd/t
B)
pd/2t
C)
pd/4t
D)
pd/6t

Correct Answer :   pd/2t

225 .
The distance between the centre of a rivet hole to the nearest edge of plate, is called
A)
margin
B)
pitch
C)
back pitch
D)
diagonal pitch

Correct Answer :   margin

226 .
When a body is subjected to a direct tensile stress (σ) in one plane, then tangential or shear stress on an oblique section of the body inclined at an angle θ to the normal of the section is
A)
σ sin 2θ
B)
σ cos 2θ
C)
σ/2 sin 2θ
D)
σ/2 cos 2θ

Correct Answer :   σ/2 sin 2θ

227 .
The actual neutral axis of a reinforced cement concrete beam is based on the principle that the moment of areas of compression and tension zones at the neutral axis are equal.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

228 .
A pressure vessel is said to be a thick shell, when
A)
it is made of thick sheets
B)
the internal pressure is very high
C)
the ratio of wall thickness of the vessel to its diameter is less than 1/10
D)
the ratio of wall thickness of the vessel to its diameter is greater than 1/10

Correct Answer :   the ratio of wall thickness of the vessel to its diameter is greater than 1/10

229 .
The neutral axis of a transverse section of a beam passes through the centre of gravity of the section and is
A)
in the vertical plane
B)
in the horizontal plane
C)
in the same plane in which the beam bends
D)
at right angle to the plane in which the beam bends

Correct Answer :   at right angle to the plane in which the beam bends

230 .
A cantilever beam is one which is
A)
fixed at both ends
B)
supported at its ends
C)
fixed at one end and free at the other end
D)
supported on more than two supports

Correct Answer :   fixed at one end and free at the other end

231 .
For a shaft, the shear stress at a point is __________ the distance from the axis of the shaft.
A)
equal to
B)
directly proportional to
C)
inversely proportional to
D)
None of the above

Correct Answer :   directly proportional to

232 .
At the neutral axis of a beam, the shear stress is
A)
maximum
B)
minimum
C)
infinity
D)
Zero

Correct Answer :   maximum

233 .
A spring used to absorb shocks and vibrations is
A)
disc spring
B)
leaf spring
C)
conical spring
D)
torsion spring

Correct Answer :   leaf spring

234 .
The shear stress at the centre of a circular shaft under torsion is
A)
zero
B)
minimum
C)
maximum
D)
infinity

Correct Answer :   zero

235 .
Strain is equal to (where l = Original length, and δl = Change in length)
A)
l/δl
B)
l.δl
C)
δl/l
D)
l + δl

Correct Answer :   δl/l

236 .
In a beam subjected to pure bending, the intensity of stress in any fibre is __________ the distance of the fibre from the neutral axis.
A)
equal to
B)
less than
C)
more than
D)
directly proportional to

Correct Answer :   directly proportional to

237 .
The total strain energy stored in a body is termed as
A)
impact energy
B)
resilience
C)
proofresilience
D)
modulus of resilience

Correct Answer :   resilience

238 .
In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least ______ the total water pressure per metre length.
A)
double
B)
equal to
C)
1.5 times
D)
2.5 times

Correct Answer :   1.5 times

239 .
A simply supported beam 'A' of length l, breadth b and depth d carries a central load W. Another beam 'B' of the same dimensions carries a central load equal to 2 W. The deflection of beam 'B' will be __________ as that of beam 'A'.
A)
double
B)
one-half
C)
one-fourth
D)
four times

Correct Answer :   double

240 .
Which of the following statement is correct?
A)
A continuous beam has only two supports at the ends.
B)
The bending moment is maximum where shear force is maximum.
C)
A uniformly distributed load spreads uniformly over the whole length of a beam.
D)
The maximum bending moment of a simply supported beam of length l with a central point load W is Wl/8.

Correct Answer :   A uniformly distributed load spreads uniformly over the whole length of a beam.

241 .
The ratio of the largest load in a test to the original cross-sectional area of the test piece is called
A)
ultimate stress
B)
yield stress
C)
elastic limit
D)
breaking stress

Correct Answer :   ultimate stress

242 .
According to Euler's column theory, the crippling load of a column is given by p = π2 EI/Cl2. In the Euler's formula, the value of C for a column with one end fixed and the other end free, is
A)
1/2
B)
1
C)
2
D)
4

Correct Answer :   4

243 .
When a bar of length l, width b and thickness t is subjected to a pull of P, its
A)
length, width and thickness decreases
B)
length increases, width and thickness decreases
C)
length, width and thickness increases
D)
length decreases, width and thickness increases

Correct Answer :   length increases, width and thickness decreases

244 .
When a body is subjected to a direct tensile stress (σ) in one plane, the maximum shear stress is __________ the maximum normal stress.
A)
equal to
B)
twice
C)
two-third
D)
one-half

Correct Answer :   one-half

245 .
The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as
A)
bending moment
B)
flexural rigidity
C)
torsional rigidity
D)
twisting moment

Correct Answer :   twisting moment

246 .
A column with maximum equivalent length has
A)
both ends fixed
B)
both ends hinged
C)
one end fixed and the other end free
D)
one end fixed and the other end hinged

Correct Answer :   one end fixed and the other end free

247 .
A column of length (l) with both ends fixed may be considered as equivalent to a column of length __________ with both ends hinged.
A)
l
B)
l/2
C)
l/4
D)
l/8

Correct Answer :   l/2

248 .
A closely-coiled helical spring is cut into two halves. The stiffness of the resulting spring will be
A)
same
B)
half
C)
double
D)
one-fourth

Correct Answer :   double

249 .
When a material is loaded within elastic limit, the material will regain its shape and size when the load is removed.
A)
Agree
B)
Disagree
C)
Can not say
D)
None of the above

Correct Answer :   Agree

250 .
The tensile strength of ductile materials is __________ its compressive strength.
A)
equal to
B)
less than
C)
greater than
D)
None of the above

Correct Answer :   greater than

251 .
The bending stress in abeam is __________ bending moment.
A)
equal to
B)
less than
C)
more than
D)
directly proportional to

Correct Answer :   directly proportional to

252 .
A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce
A)
no stress
B)
shear stress
C)
tensile stress
D)
compressive stress

Correct Answer :   no stress

253 .
The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.
A)
one-half
B)
twice
C)
equal to
D)
four times

Correct Answer :   twice

254 .
A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
A)
400 MPa
B)
500 MPa
C)
900 MPa
D)
1400 MPa

Correct Answer :   1400 MPa

255 .
Strain energy is the__________.
A)
proof resilience per unit volume of a material
B)
maximum strain energy which can be stored in a body
C)
energy stored in a body when strained within elastic limits
D)
energy stored in a body when strained upto the breaking of a specimen

Correct Answer :   energy stored in a body when strained within elastic limits

256 .
The object of caulking in a riveted joint is to make the joint
A)
leak-proof
B)
free from stresses
C)
stronger in tension
D)
free from corrosion

Correct Answer :   leak-proof

257 .
Euler's formula holds good only for
A)
weak columns
B)
long columns
C)
short columns
D)
both short and long columns

Correct Answer :   long columns

258 .
A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
A)
axis of load
B)
minimum moment of inertia
C)
maximum moment of inertia
D)
perpendicular to the axis of load

Correct Answer :   minimum moment of inertia

259 .
The neutral axis of the cross-section a beam is that axis at which the bending stress is
A)
zero
B)
minimum
C)
maximum
D)
infinity

Correct Answer :   zero

260 .
The shear force and bending moment are zero at the free end of a cantilever beam, if it carries a
A)
point load at the free end
B)
point load at the middle of its length
C)
Both (A) and (B)
D)
uniformly distributed load over the whole length

Correct Answer :   uniformly distributed load over the whole length

261 .
The unit of modulus of elasticity is same as those of
A)
strain, force and pressure
B)
stress, strain and pressure
C)
stress, force and modulus of rigidity
D)
stress, pressure and modulus of rigidity

Correct Answer :   stress, pressure and modulus of rigidity

262 .
A bar of length L metres extends by l mm under a tensile force of P. The strain produced in the bar is
A)
l/L
B)
0.1 l/L
C)
0.01 l/L
D)
0.001 l/L

Correct Answer :   0.001 l/L

263 .
A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then
A)
rod is under compression
B)
tube is under compression
C)
both rod and tube are under compression
D)
tube is under tension and rod is under compression

Correct Answer :   both rod and tube are under compression

264 .
A column is said to be a short column, when
A)
its length is very small
B)
its cross-sectional area is small
C)
the ratio of its length to the least radius of gyration is more than 80.
D)
the ratio of its length to the least radhis of gyration is less than 80.

Correct Answer :   the ratio of its length to the least radhis of gyration is less than 80.

265 .
In a thick cylindrical shell subjected to an internal pressure (p), the radial stress across the thickness of the cylinder is
A)
maximum at the inner surface arid zero at the outer surface
B)
maximum at the outer surface and zero at the inner surface
C)
maximum at the inner surface and minimum at the outer surface
D)
maximum at the outer surface and minimum at the inner surface

Correct Answer :   maximum at the inner surface arid zero at the outer surface

266 .
The load required to produce a unit deflection in a spring is called
A)
Young's modulus
B)
spring stiffness
C)
flexural rigidity
D)
torsional rigidity

Correct Answer :   spring stiffness

267 .
In a riveted joint, when the rivets in the various rows are opposite to each other, the joint is said to be
A)
zig-zag riveted
B)
chain riveted
C)
diamond riveted
D)
None of the above

Correct Answer :   chain riveted

268 .
In order to avoid tearing off the plate at an edge, the distance from the centre of the rivet hole to the nearest edge of the plate (i.e. margin) should be (where d = Diameter of rivet hole in mm)
A)
d
B)
1.5 d
C)
2 d
D)
2.5 d

Correct Answer :   1.5 d

269 .
A beam supported on more than two supports is called
A)
fixed beam
B)
overhanging beam
C)
continuous beam
D)
simply supported beam

Correct Answer :   continuous beam

270 .
Two beams, one of circular cross-section and the other of square cross-section, have equal areas of cross-sections. When these beams are subjected to bending,
A)
square beam is more economical
B)
circular beam is more economical
C)
both beams are equally economical
D)
None of the above

Correct Answer :   square beam is more economical

271 .
The compression test is carried on __________ materials.
A)
plastic
B)
ductile
C)
malleable
D)
brittle

Correct Answer :   brittle

272 .
A beam extending beyond the supports is called
A)
fixed beam
B)
overhanging beam
C)
cantilever beam
D)
simply supported beam

Correct Answer :   overhanging beam

273 .
When a column is subjected to an eccentric load, the stress induced in the column will be
A)
shear stress only
B)
direct stress only
C)
bending stress only
D)
direct and bending stress both

Correct Answer :   direct and bending stress both

274 .
When a shaft is subjected to a twisting moment, every cross-section of the shaft will be under
A)
shear stress
B)
tensile stress
C)
bending stress
D)
compressive stress

Correct Answer :   shear stress

275 .
The centre to centre distance, between two consecutive rivets in a row, is called
A)
margin
B)
back pitch
C)
pitch
D)
diagonal pitch

Correct Answer :   pitch

276 .
When a body is subjected to two equal and opposite pulls, as a result of which the body tends to extend its length, the stress and strain induced is
A)
tensile stress, compressive strain
B)
compressive stress, tensile strain
C)
tensile stress, tensile strain
D)
compressive stress, compressive strain

Correct Answer :   tensile stress, tensile strain

277 .
A continuous beam is one which is
A)
extending beyond the supports
B)
supported on more than two supports
C)
fixed at both ends
D)
fixed at one end and free at the other end

Correct Answer :   supported on more than two supports

278 .
The pull required to shear off a rivet, in double shear, per pitch length is
A)
π/2 x d² x τ
B)
π/4 x d² x τ
C)
π/2 x d² x σt
D)
π/4 x d² x σt

Correct Answer :   Ï€/2 x d² x Ï„

279 .
The ductility of the material __________ with the decrease in percentage elongation of a specimen under tensile test.
A)
increases
B)
decreases
C)
remains same
D)
None of the above

Correct Answer :   decreases

280 .
Lame's theory is associated with
A)
thin cylindrical shells
B)
direct and bending stresses
C)
Both (A) and (B)
D)
thick cylindrical shells

Correct Answer :   thick cylindrical shells

281 .
In a simple bending theory, one of the assumption is that the plane sections before bending remain plane after bending. This assumption means that
A)
stress is uniform throughout the beam
B)
strain is uniform throughout the beam
C)
strain is proportional to the distance from the neutral axis
D)
stress is proportional to the distance from the neutral axis

Correct Answer :   strain is proportional to the distance from the neutral axis

282 .
The shear force in the centre of a simply supported beam carrying a uniformly distributed load of w per unit length, is
A)
zero
B)
wl²/2
C)
wl²/4
D)
wl²/8

Correct Answer :   zero

283 .
When a change in length takes place, the strain is known as
A)
shear strain
B)
linear strain
C)
lateral strain
D)
volumetric strain

Correct Answer :   linear strain

284 .
A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The maximum normal stress will be
A)
-100 MPa
B)
250 MPa
C)
300 MPa
D)
400 MPa

Correct Answer :   400 MPa

285 .
The Rankine's constant for a mild steel column with both ends hinged is
A)
1/750
B)
1/1600
C)
1/7500
D)
1/9000

Correct Answer :   1/7500

286 .
The moment of resistance of a balanced reinforced concrete beam is based on the stresses in
A)
steel only
B)
concrete only
C)
steel and concrete both
D)
None of the above

Correct Answer :   steel and concrete both

287 .
The load at which the column just buckles, is known as
A)
buckling load
B)
critical load
C)
crippling load
D)
any one of the above

Correct Answer :   any one of the above

288 .
According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end free is __________ the crippling load for a similar column hinged at both the ends.
A)
equal to
B)
less than
C)
more than
D)
None of the above

Correct Answer :   less than

289 .
If percentage reduction in area of a certain specimen made of material 'A' under tensile test is 60% and the percentage reduction in area of a specimen with same dimensions made of material 'B' is 40%, then
A)
the material A is more ductile than material B
B)
the material B is more ductile than material A
C)
the ductility of material A and B is equal
D)
the material A is brittle and material B is ductile

Correct Answer :   the material A is more ductile than material B

290 .
When a cantilever beam is loaded at its free end, the maximum compressive stress shall develop at
A)
bottom fibre
B)
top fibre
C)
neutral axis
D)
centre of gravity

Correct Answer :   bottom fibre

291 .
The shear force diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, consists of
A)
one right angled triangle
B)
two right angled triangles
C)
one equilateral triangle
D)
two equilateral triangles

Correct Answer :   two right angled triangles

292 .
A body is subjected to two normal stresses 20 kN/m² (tensile) and 10 kN/m2 (compressive) acting perpendicular to each other. The maximum shear stress is
A)
5 kN/m²
B)
10 kN/m²
C)
15 kN/m²
D)
20 kN/m²

Correct Answer :   15 kN/m²

293 .
When a beam is subjected to bending moment, the stress at any point is __________ the distance of the point from the neutral axis.
A)
equal to
B)
independent of
C)
directly proportional to
D)
inversely proportional to

Correct Answer :   directly proportional to

294 .
The unit of strain is
A)
mm
B)
N-mm
C)
N/mm
D)
no unit

Correct Answer :   no unit

295 .
The torsional rigidity of a shaft is given by
A)
T/θ
B)
T/G
C)
T/J
D)
T/r

Correct Answer :   T/θ

296 .
A tensile test is performed on a round bar. After fracture, it has been found that the diameter remains approximately same at fracture. The material under test was
A)
glass
B)
cast iron
C)
copper
D)
mild steel

Correct Answer :   cast iron

297 .
Modulus of rigidity may be defined as the ratio of
A)
linear stress to linear strain
B)
shear stress to shear strain
C)
linear stress to lateral strain
D)
lateral strain to linear strain

Correct Answer :   shear stress to shear strain

298 .
In a simply supported beam carrying a uniformly distributed load w per unit length, the point of contraflexure
A)
lies at the ends of the beam
B)
lies in the centre of the beam
C)
depends upon the length of beam
D)
does not exist

Correct Answer :   does not exist

299 .
The elongation of a conical bar under its own weight is __________ that of prismatic bar of the same length.
A)
half
B)
equal to
C)
one-third
D)
two-third

Correct Answer :   one-third

300 .
When the shear force diagram is a parabolic curve between two points, it indicates that there is a
A)
uniformly varying load between the two points
B)
point load at the two points
C)
no loading between the two points
D)
uniformly distributed load between the two points

Correct Answer :   uniformly varying load between the two points

301 .
The slenderness ratio is the ratio of
A)
least radius of gyration to area of column
B)
length of column to least radius of gyration
C)
area of column to least radius of gyration
D)
least radius of gyration to length of column

Correct Answer :   length of column to least radius of gyration

302 .
When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal
A)
polar modulus
B)
diameter
C)
angle of twist
D)
polar moment of inertia

Correct Answer :   polar modulus

303 .
According to Euler's column theory, the crippling load for a column of length (l) fixed at both ends is __________ the crippling load for a similar column hinged at both ends.
A)
equal to
B)
two times
C)
four times
D)
eight times

Correct Answer :   four times

304 .
A body is subjected to a direct tensile stress of 300 MPa in one plane accompanied by a simple shear stress of 200 MPa. The minimum normal stress will be
A)
-100 MPa
B)
250 MPa
C)
300 MPa
D)
400 MPa

Correct Answer :   -100 MPa

305 .
A riveted joint may fail by
A)
shearing of rivets
B)
tearing of the plate at an edge
C)
tearing of the plate across a row of rivets
D)
any one of the above

Correct Answer :   any one of the above

306 .
The ratio of linear stress to the linear strain is called
A)
bulk modulus
B)
Poisson's ratio
C)
modulus of elasticity
D)
modulus of rigidity

Correct Answer :   modulus of elasticity