Latest Science and Technology General Knowledge(GK) Questions and answers

1 .

For Galvanizing Iron which of the following Metals is used?

A)

Lead

B)

Copper

C)

Zinc

D)

Aluminium

Correct Answer : Zinc

The process of applying a coating of zinc (Zn) on iron or steel to protect it from rusting is called galvanising or galvanizing iron.

Zinc is also called sacrificial anode. The process is called cathodic protection. If zinc is scratched or corroded, it will continue to protect the iron from oxidation electrochemically. Tin also protects iron from rusting. But when it is worn away, it accelerates rusting instead of protecting it.

2 .

Wireless transmission can be done via

A)

Radio waves

B)

Infrared waves

C)

Microwaves

D)

All of the above

Correct Answer : All of the above

Wireless transmission can be done via any of the Infrared waves, Radio waves or Microwaves.

3 .

What is the first step in the refining of petroleum?

A)

Cracking

B)

Drilling

C)

Cooling

D)

Distillation

Correct Answer : Distillation

The very first step in the refining of petroleum oil is Fractional distillation i.e, the fractionation of crude oil in atmospheric vacuum distillation towers.

The first process in a petroleum refinery is known as distillation. In this process, crude oil is heated and filled into a distillation column.

4 .

One fathom is equal to how many meters?

A)

1.7699

B)

1.8288

C)

2.0210

D)

2.1212

Correct Answer : 1.8288

One fathom = 1.8288 meters = 6 feet

A fathom is a unit of length used especially for measuring the depth of water.

5 .

Heat transfer horizontally within the atmosphere is called

A)

Advection

B)

Absorption

C)

Convection

D)

Conduction

Correct Answer : Advection

Convection transfers heat vertically into the atmosphere. In order for heat to be transferred to other regions, it must be transferred horizontally by the wind. The horizontal transfer of heat by the wind is called advection. Advection is a transport mechanism of a substance or conserved property by a fluid due to the fluid’s bulk motion. An example of advection is the transport of pollutants or silt in a river by bulk water flow downstream.

6 .

Cosmetic powders are prepared from

A)

Gypsum

B)

Asbestos

C)

Serpentine

D)

Talc

Correct Answer : Talc

Cosmetic powders are prepared from Talc. Face powder is a cosmetic powder applied to the face to set a foundation after application. It can also be reapplied throughout the day to minimize shininess caused by oily skin. There is translucent sheer powder, and there is pigmented powder.

7 .

Tides are primarily a result of the ____ ?

A)

Earth's pressure system

B)

Ocean Currents

C)

Attraction of the Moon

D)

Farrel's law

Correct Answer : Attraction of the Moon

Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).

8 .

Which of the following is not a sedimentary structure?

A)

Mud cracks

B)

Magma emplacement

C)

Cross beds

D)

Ripple marks

Correct Answer : Magma emplacement

sedimentary features all are related to water deposited minerals and rocks.

Which of your choices has nothing to do with water is not a sedimwntary structure. Here in the given choices Magma emplacement is not a sedimentary structure.

9 .

Which gymnospermic plant cures rheumatism?

A)

Pinus

B)

Ephedra

C)

Araucaria

D)

Gnetum

Correct Answer : Gnetum

Oil from Gnetum spp a gymnosperm belonging to the family Gnetaceae is used to relieve the effects of rheumatism

The lianas and shrubs of Gnetum are found in the rain forests of the western ghats.

10 .

Which of the following is not a macronutrient?

A)

Chlorine

B)

Calcium

C)

Proteins

D)

Carbohydrates

Correct Answer : Chlorine

Nutrients that are needed in large amounts are called Macronutrients.

There are three macronutrients required by humans :

1. carbohydrates (sugar),

2. lipids (fats), and

3. proteins.

Each of these macronutrients provides energy in the form of calories.
Some other macronutrients are: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), sulfur (S), magnesium (Mg), sodium (Na).