KVPY Stream-SA (Class 11) Physics: Questions 31 - 32 of 242

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Question number: 31

» Laws of Motion » Static and Kinetic Friction

Appeared in Year: 2010

MCQ▾

Question

A block of mass M rests on a rough horizontal table. A steadily increasing horizontal force is applied such that the block starts to slide on the table without toppling. The force is contained even after sliding has started. Assume the coefficients of static end kinetic friction between the table and block to be equal. The correct representation of the variation of the frictional force f’ exerted by the table on the block with time t is given by,

Choices

Choice (4) Response
a.
Graph of friction force f’ ⟶ time t (Choice A)

Graph of Friction Force F’ ⟶ Time T (Choice A)

Figure shows the representation of the variation of the frictional force f’ exerted by the table on the block with time t.

b.
Graph of friction force f’ ⟶ time t (Choice B)

Graph of Friction Force F’ ⟶ Time T (Choice B)

Figure shows the representation of the variation of the frictional force f’ exerted by the table on the block with time t.

c.
Graph of friction force f’ ⟶ time t (Choice C)

Graph of Friction Force F’ ⟶ Time T (Choice C)

Figure shows the representation of the variation of the frictional force f’ exerted by the table on the block with time t.

d.
Graph of friction force f’ ⟶ time t (Choice D)

Graph of Friction Force F’ ⟶ Time T (Choice D)

Figure shows the representation of the variation of the frictional force f’ exerted by the table on the block with time t.

Question number: 32

» Kinetic Theory of Gases » Kinetic Theory of Gases

Appeared in Year: 2011

MCQ▾

Question

We sit in the room with windows open. Then

Choices

Choice (4) Response
a.

Air pressure on the floor of the room equals the atmospheric pressure but the air pressure on the ceiling is negligible

b.

Air pressure on the floor equals the weight of the air column inside the room (from floor to ceiling) per unit area

c.

Air pressure is nearly the same on the floor, the walls and the ceiling

d.

Air pressure on the walls is zero since the weight of air acts downward

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