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Question (11)

QN0035629

An air bubble of negligible weight having radius rises steadily through a solution of density at speed . The coefficient of viscosity of the solution is given by:

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

We know that for air bubble in liquid

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Question (12)

QN0035630

If a ball of steel (density ) attains a terminal velocity of when falling in a tank of water (coefficient of viscosity ) then its terminal velocity in glycerine would be nearly

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

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Question (13)

QN0035631

A solid ball of volume experiences a viscous force when falling with a speed in a liquid. If another ball of volume with the same velocity is allowed to fall in the same liquid, it experiences a force

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

From stoke's law, , and

volume

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Question (14)

QN0035632

What is the velocity of a metallic ball of radius falling in a tank of liquid at the instant when its acceleration is onehalf that of a freely falling body? (The densities of metal and of liquid are and respectively, and the viscosity of the liquid is ).

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

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Question (15)

QN0035633

A spherical ball of iron of radius is falling through a column of glycerine. If densities of glycerine and iron are respectively and for glycerine , then the terminal velocity is

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

Terminal velocity,

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Question (16)

QN0035634

A small spherical ball falling through a viscous medium of negligible density has terminal velocity . Another ball of the same mass but of radius twice that of the earlier falling through the same viscous medium will have terminal velocity

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

If is the density of the ball and that of the another ball, for the balls are the same, but

(by Stoke's law)

or, So,

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Question (11)

An air bubble of negligible weight having radius rises steadily through a solution of density at speed . The coefficient of viscosity of the solution is given by:

Explanation:

Link:

Question (12)

If a ball of steel (density ) attains a terminal velocity of when falling in a tank of water (coefficient of viscosity ) then its terminal velocity in glycerine would be nearly

Explanation:

Link:

Question (13)

A solid ball of volume experiences a viscous force when falling with a speed in a liquid. If another ball of volume with the same velocity is allowed to fall in the same liquid, it experiences a force

Explanation:

Link:

Question (14)

What is the velocity of a metallic ball of radius falling in a tank of liquid at the instant when its acceleration is onehalf that of a freely falling body? (The densities of metal and of liquid are and respectively, and the viscosity of the liquid is ).

Explanation:

Link:

Question (15)

A spherical ball of iron of radius is falling through a column of glycerine. If densities of glycerine and iron are respectively and for glycerine , then the terminal velocity is

Explanation:

Link:

Question (16)

A small spherical ball falling through a viscous medium of negligible density has terminal velocity . Another ball of the same mass but of radius twice that of the earlier falling through the same viscous medium will have terminal velocity

Explanation:

Link:

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