NEET Physics: Questions 1955 - 1959 of 2098

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Question number: 1955

» Rotational Motion » Moment of Inertia

MCQ▾

Question

Two discs of same thickness but of different radii are made of two different materials such that their masses are same. The densities of the materials are in the ratio 1: 3. The ratio of the moments of inertia of these discs about the respective axes passing through their centers and perpendicular to their planes will be in,

Choices

Choice (4) Response

a.

9: 1

b.

3: 1

c.

1: 9

d.

1: 3

Question number: 1956

» Gravitation » Energy

MCQ▾

Question

If g is the acceleration due to gravity on the earth’s surface the gain in P. E. of an object of mass m raised from the surface of the earth to a height of the radius R of the earth is -

Choices

Choice (4) Response

a.

mgR

b.

mgR4

c.

mgR2

d.

2mgR

Question number: 1957

» Gravitation » Universal Law of Gravitation

MCQ▾

Question

What is the mass of the planet that has a satellite whose time period is T and orbital radius is r?

Choices

Choice (4) Response

a.

4π2rGT2

b.

4π2r3GT2

c.

4π2r3GT3

d.

3π2r3GT2

Question number: 1958

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

Question

The speed with which the earth have to rotate on its axis so that a person on the equator would weigh (27) the as much as present will be - (Take the equatorial radius as 6400 km. )

Choices

Choice (4) Response

a.

7.28 ⨯ 10 -3 rad/sec

b.

9.35 ⨯ 10 -4 rad/sec

c.

3 28 ⨯ 10 -3 rad/sec

d.

5.53 ⨯ 10 -4 rad/sec

Question number: 1959

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

A long rod has a mass of 0.12 kg and length of 1 m. The moment of inertia about an axis passing through the center and perpendicular to the length of rod will be

Choices

Choice (4) Response

a.

0.01 kg-m 2

b.

1 kg-m 2

c.

10 kg-m 2

d.

0.001 kg-m 2

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