NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1938 - 1942 of 2142

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Question number: 1938

» Gravitation » Energy

MCQ▾

Question

A body of mass 250 kg falls on the earth from infinity. What will be its energy on reaching the earth? Radius of the earth is 6400 km and g = 9.8 m/s 2. Air friction is negligible.

Choices

Choice (4) Response

a.

1.56 ⨯ 10 10 J

b.

2.27 ⨯ 10 10 J

c.

2.54 ⨯ 10 9 J

d.

1.27 ⨯ 10 9 J

Question number: 1939

» 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 Equation 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.

3 28 ⨯ 10 -3 rad/sec

c.

3 28 ⨯ 10 -4 rad/sec

d.

7.83 ⨯ 10 -4 rad/sec

Question number: 1940

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

A flywheel rotating about a fixed axis has a kinetic energy of 380 J, when its angular speed is 35 rad s -1. The moment of inertia of the wheel about the axis of rotation is,

Choices

Choice (4) Response

a.

0.8 kg m 2

b.

0.75 kg m 2

c.

0.15 kg m 2

d.

0.62 kg m 2

Question number: 1941

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

A cylinder of 500 g and radius 10 cm has moment of inertia (about its natural axis)

Choices

Choice (4) Response

a.

2.5 ⨯ 10 -3 kg-m 2

b.

2 ⨯ 10 -3 kg-m 2

c.

3.5 ⨯ 10 -3 kg-m 2

d.

5 ⨯ 10 -3 kg-m 2

Question number: 1942

» Rotational Motion » Values of Moments of Inertia

MCQ▾

Question

Three particles of mass 1.5 kg are attached to the rim of a circular disc of radius 0.2 m & negligible mass. Moment of inertia of die system about an axis passing through the center of the disc & perpendicular to its plane is

Choices

Choice (4) Response

a.

2.2 kg-m 2

b.

0.18 kg-m 2

c.

l kg-m 2

d.

0.24 kg-m 2

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