Rotational Motion (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 22 - 26 of 125

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Question number: 22

» Rotational Motion » Torque

MCQ▾

Question

An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver?

Choices

Choice (4) Response

a.

350 N-m

b.

440 N-m

c.

628 N-m

d.

531 N-m

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Question number: 23

» Rotational Motion » Angular Momentum

MCQ▾

Question

A particle performs uniform circular motion with an angular momentum L. If the frequency of a particle’s motion is doubled and its kinetic energy is halved, the angular momentum becomes.

Choices

Choice (4) Response

a.

L/2

b.

4 L

c.

L/4

d.

2 L

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Question number: 24

» Rotational Motion » Torque

MCQ▾

Question

A torque of 30 N-m is applied on a 5 kg wheel whose moment of inertia is 2kg-m 2 for 10 sec. The angle covers by the wheel in 10 sec will be

Choices

Choice (4) Response

a.

6000 rad

b.

750 rad

c.

1500 rad

d.

3000 rad

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Question number: 25

» Rotational Motion » Torque

Assertion-Reason▾

Assertion (Ꭺ)

Torque due to force is maximum when angle between r and F is 90°.

Reason (Ꭱ)

The unit of torque is newton- meter.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

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Question number: 26

» Rotational Motion » Angular Momentum

MCQ▾

Question

If the earth is a point mass of 6 x l0 24 kg revolving around the sun at a distance of 1.5xl0 8 km and in time T = 3.14 xl0 7 s. Then the angular momentum of the earth around the sun is

Choices

Choice (4) Response

a.

1.8 x 10 29 kg m 2 /s

b.

2.7 x 10 40 kg m 2 /s

c.

1.5 x 10 37 kg m 2 /s

d.

1.2 x 10 18 kg m 2 /s

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