Rotational Motion-Moment of Inertia (NEET Physics): Questions 15 - 17 of 34

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Question number: 15

» Rotational Motion » Moment of Inertia

MCQ▾

Question

One quarter section is cut from a uniform circular disc of radius R. This section has mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is

Quarter section - cut from a uniform circular disc of radius R

Quarter Section - Cut From a Uniform Circular Disc of Radius R

In figure one quarter sector is cut from a uniform circular disc of radius R and mass M

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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) Equation

(2) Equation

(3) Equation

(4) Equation

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

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