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Question (21)

QN0035064

A triangular block of mass with angles , and rests with its side on a horizontal table. A cubical block of mass rests on the side. The acceleration which must have relative to the table to keep stationary relative to the triangular block assuming frictionless contact is

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

Correct Answer: C

Explanation:

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Question (22)

QN0035065

The acceleration of the system shown in the figure is given by the expression (coefficient of friction between and surface is )

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

Correct Answer: A

Explanation:

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Question (23)

QN0035066

and zero A block of mass is suspended through two light spring balances and . Then and will read respectively:

(A)
and zero
(B)
zero and
(C)
and
(D)
and

Correct Answer: C

Explanation:

In series each spring will have same force. Here it is -wt.

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Question (24)

QN0035067

A block of mass is placed on a smooth wedge of inclination . The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block ( is acceleration due to gravity) will be

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

Correct Answer: A

Explanation:

also

from (2)

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Question (25)

QN0035068

The net force on a rain drop falling down with a constant speed is

(A)
weight of drop
(B)
viscous drag of air
(C)
force of buoyany
(D)
zero

Correct Answer: D

Explanation:

When a rain drop falls down with the constant speed, its weight is balanced by the upward viscous drag of air and the force of buoyancy. Thus the net force acting on it is zero.

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Question (26)

QN0035069

A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then

(A)
the body may necessarily change direction
(B)
the body is sure to slow down
(C)
the body will necessarily continue to move in the same direction at the same speed
(D)
None of these

Correct Answer: B

Explanation:

Opposite force causes retardation.

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Question (21)

A triangular block of mass with angles , and rests with its side on a horizontal table. A cubical block of mass rests on the side. The acceleration which must have relative to the table to keep stationary relative to the triangular block assuming frictionless contact is

Explanation:

Link:

Question (22)

The acceleration of the system shown in the figure is given by the expression (coefficient of friction between and surface is )

Explanation:

Link:

Question (23)

and zero A block of mass is suspended through two light spring balances and . Then and will read respectively:

Explanation:

Link:

Question (24)

A block of mass is placed on a smooth wedge of inclination . The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block ( is acceleration due to gravity) will be

Explanation:

Link:

Question (25)

The net force on a rain drop falling down with a constant speed is

Explanation:

Link:

Question (26)

A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then

Explanation:

Link:

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