NEET Physics: Questions 2038 - 2042 of 2098

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Question number: 2038

» Rotational Motion » Rotational Kinetic Energy

MCQ▾

Question

A body is rolling down an inclined plane. Its translational and rotational kinetic energies are equal. The body is not a,

(1) Solid sphere

(2) Hollow sphere

(3) Solid cylinder

(4) Hollow cylinder

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, 2 and 3 are correct

d.

1 and 3 are correct

Question number: 2039

» Rotational Motion » Moment of Inertia

MCQ▾

Question

What is the moment of inertia of inertia of a wheel of mass m and radius R having two spokes each of mass m? (The axis of rotation perpendicular to plane and passing through center)

Choices

Choice (4) Response

a.

mR2

b.

53mR2

c.

12mR2

d.

23mR2

Question number: 2040

» Rotational Motion » Rigid Body Rotation Equations of Rotational Motion

MCQ▾

Question

A wheel has a speed of 2100 revolutions per minute and is made to slow down at a rate of 5 radians /s 2. The number of revolutions is makes before coming to rest is

Choices

Choice (4) Response

a.

770

b.

543

c.

722

d.

272

Question number: 2041

» Rotational Motion » Moment of Inertia

MCQ▾

Question

The moment of inertia of a uniform circular ring, having a mass M and a radius R, about an axis tangential to the ring and perpendicular to its plane, is

Choices

Choice (4) Response

a.

MR2

b.

12MR2

c.

2MR2

d.

32mR2

Question number: 2042

» Rotational Motion » Torque

Assertion-Reason▾

Assertion (Ꭺ)

The force of fiction in the case of a disc rolling without slipping down an inclined plane is 13gsinα .

Reason (Ꭱ)

When the disc rolls without slipping, friction is required because for rolling condition velocity of point of contact is zero.

Choices

Choice (4) Response

a.

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

b.

Both Ꭺ and Ꭱ are false

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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