Physics - Questions and Answers, General Study (GK)

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131.

A liquid will not wet the surface of solid if the angle of contact is

(a)obtuse

(b)acute

(c)π/2

(d)zero

Comment

Answer is: ANA

132.

An oil drop is placed on the surface of water. It will

(a)remain of the surface as a distorted drop

(b)remain on the surface as a sphere

(c)spread as a thin layer

(d)none of the above

Comment

Answer is: CNA

133.

When the temperature increases, the angle of contact of liquid

(a)decreases

(b)increases

(c)remain the same

(d)none of these

Comment

Answer is: ANA

134.

When there are no external forces the shape of a liquid drop is determined by

(a)viscosity

(b)density of the liquid

(c)temperature of air

(d)surface tension of the liquid

Comment

Answer is: DNA

135.

Ball pen functions on which one of the following principle?

(a)Boyle's law

(b)Gravitational force

(c)Surface tension

(d)Viscosity

Comment

Answer is: CNA

136.

Consider the following statements
If there were no capillarity
1. it would be impossible to use a kerosene lamp.
2. one would not be able to use a straw to consume a soft drink.
3. The blotting paper would fail to function.
4. There would have been no plants on the earth.
Which of the statements give above are correct?

(a)1, 2 and 4

(b)1, 3 and 4

(d)1, 2, 3 and 4

Comment

Answer is: BNA

137.

Bernoulli's theorem is based on the conservation of

(a)energy

(b)mass

(c)momentum

(d)All of these

Comment

Answer is: ANA

138.

The velocity of rain drop attains constant value because of

(a)up thrust of air

(b)surface tension

(c)viscous force exerted by air

(d)air currents

Comment

Answer is: CNA

139.

If temperature rises, the coefficient of viscosity of liquid

(a)increases

(b)decreases

(c)remains unchanged

(d)none of the above

Comment

Answer is: BNA

140.

Bernoulli's theorem is applicable to

(a)surface tension

(b)viscosity

(c)flow of liquids

(d)static fluid pressure

Comment

Answer is: CNA

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Physics - Questions and AnswersPage 14

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