Rotational Motion-Torque (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 5 - 10 of 25

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Question number: 5

» Rotational Motion » Torque

MCQ▾

Question

Find the torque of a force F =- i + 2 j + 3 k acting at the point r = i + 3 j + 5k

Choices

Choice (4) Response

a.

-21i + 3j + 5k

b.

-i - 8j + 5k

c.

14i - 38j + 16k

d.

7i - 19j + 19k

Question number: 6

» Rotational Motion » Torque

MCQ▾

Question

Find the torque of a force F =-3 i + j+5 k acting at the point r = 7 i + 3 j + k

Choices

Choice (4) Response

a.

-21i + 3j + 5k

b.

-l4i + 38j -16k

c.

4i + 4j + 6k

d.

14i - 38j + 16k

Question number: 7

» Rotational Motion » Torque

MCQ▾

Question

Find the torque of a force F =-2 i + j+3 k acting at the point r = 5 i + 3 j + 2k

Choices

Choice (4) Response

a.

14i - 38j + 16k

b.

-l4i + 38j -16k

c.

-21i + 3j + 5k

d.

7i - 19j + 19k

Question number: 8

» 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

Question number: 9

» 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.

b.

c.

d.

Question number: 10

» 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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