Practice MCQ Questions and answers on Physics-GK

1

Which of the following terms is not used in the field of physics?

A) Latent heat B) Nuclear fusion C) Refractive index D) Stock value

Discuss

Answer & Solution

Answer: Option D

Solution:

Stock value is not used in the field of physics.

2

Radiocarbon is produced in the atmosphere as a result of

A) Collision between fast neutrons and nitrogen nuclei present in the atmosphere. B) Action of ultraviolet light from the sun on atmospheric oxygen. C) Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere. D) Lightning discharge in atmosphere.

Discuss

Answer & Solution

Answer: Option A

Solution:

Radiocarbon is produced in the atmosphere as result of collision between fast neutrons and nitrogen nuclei present in the atmosphere.

3

It is easier to roll a stone up a sloping road than to lift it vertical upwards because

A) Work done in rolling is more than in lifting. B) Work done in lifting the stone is equal to rolling it. C) Work done in both is same but the rate of doing work is less in rolling. D) Work done in rolling a stone is less than in lifting it.

Discuss

Answer & Solution

Answer: Option D

Solution:

It is easier to roll a stone up a sloping road than to lift it vertical upwards because work done in rolling a stone is less than in lifting it.

4

The absorption of ink by blotting paper involves:

A) Viscosity of ink B) Capillary action phenomenon C) Diffusion of ink through the blotting D) Siphon action

Discuss

Answer & Solution

Answer: Option B

Solution:

The absorption of ink by blotting paper involves capillary action phenomenon because the blotting paper is a thin and a smooth paper which allows a little thicker liquids like ink to absorb.

5

Siphon will fail to work if:

A) The densities of the liquid in the two vessels are equal. B) The level of the liquid in the two vessels are at the same height. C) Both its limbs are of unequal length. D) The temperature of the liquids in the two vessels are the same.

Discuss

Answer & Solution

Answer: Option B

Solution:

Siphon is a tube bent to form two legs of unequal length by which a liquid can be transferred from a reservoir and then down to a lower level of it. Siphon will fail to work if, the level of the liquid in the two vessels are at the same height.

6

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to:

A) The heating effect of current alone B) Hysteresis loss alone C) Both the heating effect of current and hysteresis loss D) Intense sunlight at noon

Discuss

Answer & Solution

Answer: Option C

Solution:

Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to both the heating effect of current and hysteresis loss.

7

Nuclear sizes are expressed in a unit named

A) Fermi B) Angstrom C) Newton D) Tesla

Discuss

Answer & Solution

Answer: Option A

Solution:

Fermi - A unit of length equal to 10^-15 meter (one femtometer), used in nuclear physics. It is similar to the diameter of a proton.

8

Light year is a unit of

A) Time B) Distance C) Light D) Intensity of light

Discuss

Answer & Solution

Answer: Option B

Solution:

Light year is a unit of distance.

9

Mirage is due to:

A) Unequal heating of different parts of the atmosphere B) Magnetic disturbances in the atmosphere C) Depletion of ozone layer in the atmosphere D) Equal heating of different parts of the atmosphere

Discuss

Answer & Solution

Answer: Option A

Solution:

Mirages happen when the ground is very hot and the air is cool. The hot ground warms a layer of air just above the ground. When the light moves through the cold air and into the layer of hot air it is refracted (bent). A layer of very warm air near the ground refracts the light from the sky nearly into a U-shaped bend.

10

Light from the Sun reaches us in nearly

A) 2 minutes B) 4 minutes C) 8 minutes D) 16 minutes

Discuss

Answer & Solution

Answer: Option C

Solution:

The light from the sun takes about 8 minutes to reach the Earth after it has been emitted from the sun's surface.