Physics - Questions and Answers, General Study (GK)

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441.

Viscosity is the property of liquids by virtue of which they

(a)Attract other molecules

(b)Become conducting

(c)Oppose the relative motion of its parts

(d)Push neighbouring molecules

Comment

Answer is: C

442.

An application of Bernoulli's equation for fluid flows is found in

(a)Viscosity meter

(b)Capillary rise

(c)Hydraulic press

(d)Dynamic lift of an aeroplane

Comment

Answer is: C

443.

Three identical vessels A, B and C are filled with water, Mercury and kerosene respectively up to equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first?

(a)Vessel B

(b)All the vessels A, B and C will be emptied simultaneously

(c)Vessel A

(d)Vessel C

Comment

Answer is: D

444.

A large tank having a small hole at the bottom is filled with water to a height h. If the stream of water coming out of the hole is directed vertically upward it will

(a)Rise to a height less than h

(b)Rise to height h

(c)Rise to height greater than h

(d)Not rise at all

Comment

Answer is: B

445.

The modulus of rigidity of a liquid is

(a)Zero

(b)Infinite

(d)None of these

Comment

Answer is: A

446.

Consider the following statements and select the correct code
1. For a given stress, the strain produced in glass is much less than that in river.
2. In plastic materials, the force of Cohesion are very small.
3. Elastic limit is the smallest stress, which results in permanent distortion.

(a)1 and 2

(b)2 and 3

(d)1, 2 and 3

Comment

Answer is: D

447.

Consider the following statements
1. Greater the value of Young's modulus of material, larger is its elasticity.
2. Steel is more elastic than copper.
which of the statements given above is/are correct

(a)Only 1

(b)Only 2

(c)Both 1 and 2

(d)Neither 1 nor 2

Comment

Answer is: C

448.

Consider the following statements
1. Quartz and phospher bronze are the examples of nearly perfectly elastic bodies.
2. Putty, mad and paraffin wax are the examples of perfectly plastic bodies.
Which of the statement given above are correct

(a)Only 1

(b)Only 2

(c)Both 1 and 2

(d)None of the above

Comment

Answer is: C

449.

Elasticity in the material is due to
1. The change is 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: D

450.

The breaking stress of a 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: A

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Physics - Questions and AnswersPage 45

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