Physics - Section 1 (10)

Directions to Solve

Physics - Section 1

73.

Light year is a unit of

A.	time
B.	distance
C.	light
D.	intensity of light

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

74.

Nuclear sizes are expressed in a unit named

A.	Fermi
B.	angstrom
C.	newton
D.	tesla

Answer: Option A

Explanation:

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.

75.

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

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

76.

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

Answer: Option B

Explanation:

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77.

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

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

78.

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

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

79.

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

Answer: Option A

Explanation:

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Physics - Section 1 (10)

Physics - Section 1

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