Rotational Motion-Torque (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 1 - 4 of 25

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Question number: 1

» Rotational Motion » Torque

MCQ▾

Question

A child is standing with folded hands at the center of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is

(1) Less than 2K

(2) Equal to K/2

(3) More than K/4

(4) Equal to 4K

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

Question number: 2

» Rotational Motion » Torque

MCQ▾

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from Aq to 4Aq in 4 seconds. The magnitude of this torque is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 3

» Rotational Motion » Torque

MCQ▾

Question

A constant torque of 700 N -m, turns a wheel of moment of inertia 50 kg -m 2 about an axis passing through the center. Angular velocity of the wheel after 2 s will be

Choices

Choice (4) Response

a.

1 rad/s

b.

15 rad/s

c.

28 rad/s

d.

5 rad/s

Question number: 4

» Rotational Motion » Torque

Assertion-Reason▾

Assertion (Ꭺ)

It is harder to open and shut the door if we apply force near the hinge.

Reason (Ꭱ)

Torque is maximum at hinge of the door.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

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