Rotational Motion (NEET Physics): Questions 93 - 96 of 123

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Question number: 93

» Rotational Motion » Angular Momentum

MCQ▾

Question

A uniform rod of length 4L is placed with one end in contact with the horizontal and is then inclined at an angle 60 0 to the horizontal and allowed to fall without slipping at contact point. When it becomes horizontal, its angular velocity will be

Choices

Choice (4) Response
a.

ω=33g4L

b.

ω=33g8L

c.

ω=3g8L

d.

ω=3Lg

Question number: 94

» Rotational Motion » Rotational Kinetic Energy

MCQ▾

Question

Two disc, each having moment of inertia 5 kg m 2 about its central axis, rotating with speeds 10 rad s -1 and 20 rad s -1, are brought in contact face with their axes of the rotation coincided. The loss of kinetic energy in the process is,

Choices

Choice (4) Response
a.

125 J

b.

5 J

c.

0 J

d.

2 J

Question number: 95

» Rotational Motion » Torque

MCQ▾

Question

A flywheel of mass 25 kg has a radius of 0.3 m. What force should be applied tangentially to the rim of the flywheel so that it acquires an angular acceleration of 4 rad s -2?

Choices

Choice (4) Response
a.

6.8 N

b.

11.2 N

c.

7.5 N

d.

2.6 N

Question number: 96

» Rotational Motion » Moment of Inertia

Assertion-Reason▾

Assertion (Ꭺ)

If two different axes are at same distance from the centre of mass of a rigid body, then moment of inertia of the given rigid body about both the axes will always be the same.

Reason (Ꭱ)

From parallel axis theorem, I=Icm+md2 where all terms have usual meaning.

Choices

Choice (4) Response
a. Ꭺ is true but Ꭱ is false
b. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
c. Ꭺ is false but Ꭱ is true
d. Both Ꭺ and Ꭱ are false

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