NEET Physics: Questions 1960 - 1963 of 2098

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Question number: 1960

» Gravitation » Energy

MCQ▾

Question

With what velocity must a body be thrown upward form the surface of the earth so that it reaches a height of 10 R e? Mass of earth M = 6 ⨯ 10 24 kg, radius R e = 6.4 ⨯ 10 6 m and G = 6.67 ⨯ 10 -11 N-m 2 /kg 2.

Choices

Choice (4) Response

a.

10.7 ⨯ 10 3 m/s

b.

10.7 ⨯ 10 5 m/s

c.

10.7 ⨯ 10 4 m/s

d.

1.07 ⨯ 10 4 m/s

Question number: 1961

» Gravitation » Energy

MCQ▾

Question

The masses and the radius of the earth and the moon are M 1, M 2 and R 1, R 2 respectively their centers are at distance d apart. The minimum speed with which a particle of mass m should be projected form a point midway between the two centers so as to escape to infinity will be

Choices

Choice (4) Response

a.

G2d(M1+M2)

b.

2GdM1M2

c.

Gd(M1+M2)

d.

2Gd(M1+M2)

Question number: 1962

» Rotational Motion » Moment of Inertia

MCQ▾

Question

Two discs of the same material and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will be in the ratio of,

Choices

Choice (4) Response

a.

1: 3

b.

1: 9

c.

1: 81

d.

1: 27

Question number: 1963

» Rotational Motion » Moment of Inertia

MCQ▾

Question

A circular disc of radius R and thickness R6 has moment of inertia I about an axis passing through its center and perpendicular to its plane. It is melted and recanted into a solid sphere. The moment of inertia of the sphere about one of its diameters as an axis of rotation will be

Choices

Choice (4) Response

a.

2I8

b.

I10

c.

I5

d.

I

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