Rotational Motion-Moment of Inertia (NEET Physics): Questions 16 - 18 of 34

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Question number: 16

» Rotational Motion » Moment of Inertia

MCQ▾

Question

The moment of inertia of a thin square plate ABCD of uniform thickness about an axis passing through the centre O and perpendicular to the plane of the plate is

Square ABCD of uniform thickness

Square ABCD of Uniform Thickness

In above figure we shows thin square plate ABCD of uniform thickness

(1) I1+I2

(2) I3+I4

(3) I1+I3

(4) I1+I2+I3+I4

where I 1, I 2, I 3 are respectively moments of inertia about axes 1, 2, 3 and 4 which are in the plane of the plate.

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

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 3 are correct

c.

1 and 2 are correct

d.

2 and 4 are correct

Question number: 17

» Rotational Motion » Moment of Inertia

Assertion-Reason▾

Assertion (Ꭺ)

If earth shrink (without change in mass) to half of its present size, length of the day would become 6 % increase.

Reason (Ꭱ)

When the size of the earth will change, its moment of inertia will also change.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 18

» Rotational Motion » Moment of Inertia

MCQ▾

Question

Two discs of the same material and thickness have radii 0.4 m and 0.8 m. Their moments of inertia about their axes will be in the ratio of

Choices

Choice (4) Response

a.

1: 81

b.

1: 27

c.

1: 16

d.

1: 3

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