Physics - Questions and Answers, General Study (GK)

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151.

The breaking stress of wire depends on

(a)material of the wire

(b)length of the wire

(c)radius of the wire

(d)shape of the cross-section of the wire

Comment

Answer is: ANA

152.

The SI unit of elastic potential energy is

(a)watt

(b)joule

(c)joule s

(d)joule s^-1

Comment

Answer is: BNA

153.

The elastic potential energy of a body is
1. Work done by the external force against the deforming force
2. Work done against the external force by the deforming force
3. The sum of work done by the external force and the deforming force.
Which one option is true?

(a)1

(b)1 and 3

(d)none of these

Comment

Answer is: ANA

154.

Elasticity in the material is due to
1. The change in effective radius of the molecules.
2. The change in intermolecular distance and restoring forces starts acting on the molecules.
3. The deforming forces acting on it.
Which option is true?

(a)1 and 2

(b)2 and 3

(d)only 2

Comment

Answer is: DNA

155.

Longitudinal strain is defined when

(a)under a large force change in length is smaller

(b)under a weak force change in length be smaller

(c)under a large force, change in length

(d)none of the above

Comment

Answer is: ANA

156.

When deep sea fishes are brought to the surface of the sea, their bodies burst. This is because the blood in their bodies flows at very

(a)high speed

(b)high pressure

(c)low speed

(d)low pressure

Comment

Answer is: ANA

157.

It is difficult to cut things with a blunt knife because

(a)the pressure exerted by knife for a given force increases with increase in bluntness

(b)a sharp edge decreases the pressure exerted by knife for a given force

(c)a blunt knife decreases the pressure for a given force

(d)a blunt knife decreases the area of intersection

Comment

Answer is: CNA

158.

When ice melts, its

(a)volume decreases

(b)volume increases

(c)volume and mass both decreases

(d)volume decreases while mass increases

Comment

Answer is: DNA

159.

Ultravoilet light of sun's radiation is prevented from reaching the earth's atmoshpere by the layer of

(a)oxygen

(b)hydrogen

(c)ozone

(d)helium

Comment

Answer is: CNA

160.

Doppler effect is independent of

(a)velocity of source

(b)velocity of listener

(c)distance between source and observer

(d)none of these

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 16

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