Physics - Questions and Answers, General Study (GK)

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121.

The tendency of liquid drop to contract and occupy minimum area due to

(a)surface tension

(b)viscosity

(c)density

(d)vapor pressure

Comment

Answer is: ANA

122.

Two capillary tubes of different diameters are dipped in water. The rise of water is

(a)same in both tubes

(b)greater in the tube of smaller diameter

(c)greater in the tube of larger diameter

(d)none of the above

Comment

Answer is: BNA

123.

With the rise of temperature, the surface tension of a liquid

(a)increases

(b)decreases

(c)remains unchanged

(d)none of the above

Comment

Answer is: BNA

124.

Insects can move on the surface of water without sinking due to

(a)viscosity

(b)surface tension of water

(c)both (a) and (b)

(d)none of the above

Comment

Answer is: BNA

125.

Kerosene oil rises up in the wick of lantern because of

(a)surface tension

(b)buoyant force of air

(c)diffusion of the oil through the wick

(d)the gravitational pull of the wick

Comment

Answer is: ANA

126.

The excess of pressure inside a dropper bubble is

(a)directly proportional to its radius

(b)inversely proportional to its surface tension

(c)directly proportional to its mass

(d)inversely proportional to its radius

Comment

Answer is: DNA

127.

When some detergent is added to water, the surface tension

(a)increases

(b)remains unaffected

(c)decreases

(d)none of the above

Comment

Answer is: CNA

128.

If a liquid wets a solid surface, the angle of contact is

(a)0°

(b)less than 90°

(c)greater than 90°

(d)90°

Comment

Answer is: BNA

129.

A liquid drop tends to assume a spherical shape because of

(a)elastic force

(b)surface tension

(c)gravitational force

(d)viscosity

Comment

Answer is: BNA

130.

Water drops do not stick to the oily surface due to

(a)lack of adhesive force

(b)water is lighter than oil

(c)surface tension

(d)cannot mix each other

Comment

Answer is: ANA

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Physics - Questions and AnswersPage 13

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