Rotational Motion-Torque (NEET Physics): Questions 5 - 10 of 24

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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.

6000 rad

b.

750 rad

c.

1500 rad

d.

3000 rad

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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