Gravitation (NEET Physics): Questions 23 - 26 of 82

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Question number: 23

» Gravitation » Geo-Stationary Satellites

MCQ▾

Question

The moon revolves round the earth 13 times in one year. If the ratio of sun-earth distance to earth-moon distance is 393, then the ratio of masses of sun and earth will be –

Choices

Choice (4) Response

a.

356

b.

365

c.

1

d.

3.56 ⨯ 10 5

Question number: 24

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

Question

A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 6.4 ⨯ 10 6 meter, the value of the orbital speed and the period of revolution of the satellite will respectively be (g = 9.8 meter/sec 2)

Choices

Choice (4) Response

a.

7.2 km/sec, 8.6 minutes

b.

7.2 km/sec, 84.6 minutes

c.

0.72 km/sec, 84.6 minutes

d.

2.7 km/sec, 8.6 minutes

Question number: 25

» Gravitation » Escape Velocity

MCQ▾

Question

Gas escapes from the surface of a planet because it acquires an escape velocity. The escape velocity will depend on which of the following factors:

(1) Mass of the planet

(2) Radius of the planet

(3) Mass of the particle escaping

(4) Temperature of the planet

Select the correct answers with mark it according to the following codes:

Choices

Choice (4) Response

a.

1.2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

1 and 4 are correct

Question number: 26

» Gravitation » Energy

MCQ▾

Question

Two satellites P and Q of same mass are revolving near the earth surface in the equatorial plane. The satellite P moves in the direction of rotation of earth whereas Q moves in the opposite direction. The ratio of their kinetic energies with respect to a frame attached to earth will be –

Choices

Choice (4) Response

a.

74378363

b.

(74378363)2

c.

(83637437)2

d.

83637437

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