Rotational Motion (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 32 - 35 of 125

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Question number: 32

» Rotational Motion » Angular Momentum

MCQ▾

Question

Two rigid bodies A and B rotate with rotational kinetic energies E A and E B respectively. The moments of inertia of A and B about the axis of rotation are I A and I B respectively. If I A = I B /8 and E A = 50 E B, the ratio of angular momentum (L A) of A to the angular momentum (L B) of B is

Choices

Choice (4) Response

a.

0. . 25

b.

2.5

c.

1.25

d.

5

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Question number: 33

» Rotational Motion » Angular Momentum

MCQ▾

Question

Calculate the angular momentum of a body whose rotational energy is 5 joule. If the angular momentum vector coincides with the axis of rotation and its moment of inertia about this axis is 3 x 10 -8 kg m 2

Choices

Choice (4) Response

a.

4 x 10 -3 kg m 2 /s

b.

5.47 x 10 -2 kg m 2 /s

c.

2 x 10 -3 kg m 2 /s

d.

Question does not provide sufficient data or is vague

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Question number: 34

» Rotational Motion » Torque

MCQ▾

Question

A wheel having moment of inertia 2 kg -m 2 about its vertical axis, rotates at the rate of 60 rpm about this axis. The torque which can stop the wheel’s rotation in 1 minute would be

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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Question number: 35

» Rotational Motion » Torque

MCQ▾

Question

A horizontal force F is applied such that the block remains stationary, then which of the following statement is false

Choices

Choice (4) Response

a.

F = N [where N is the normal reaction]

b.

F will not produce torque

c.

N will not produce torque

d.

f = mg [where f is the friction force]

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