Rotational Motion-Concepts of Rotational Motion (NEET Physics): Questions 4 - 6 of 6

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Question number: 4

» Rotational Motion » Concepts of Rotational Motion

MCQ▾

Question

One solid sphere and a disc of same radius are falling along an inclined plane without slip. One reaches earlier than the other due to,

(1) Different size

(2) Different radius of gyration

(3) Different moment of inertia

(4) Different friction

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

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

Question number: 5

» Rotational Motion » Concepts of Rotational Motion

MCQ▾

Question

A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length l and height h. What is the speed of its centre of mass when the cylinder reaches its bottom?

Choices

Choice (4) Response

a.

43gh

b.

2gh

c.

4gh

d.

34gh

Question number: 6

» Rotational Motion » Concepts of Rotational Motion

Assertion-Reason▾

Assertion (Ꭺ)

Two cylinders, one hollow (metal) and the other solid (wood) with the same mass and identical dimensions are simultaneously allowed to roll without slipping down an inclined plane from the same height. The hollow cylinder will reach the bottom of the inclined plane first.

Reason (Ꭱ)

By the principle of conservation of energy. The total kinetic energies of both the cylinders are identical when they reach the bottom of the incline.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

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

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