# Gravitation (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 20 - 24 of 84

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## Question number: 20

» Gravitation » Gravitational Acceleration

MCQ▾

### Question

Two planets of radii in the ratio 1: 2 are made from the materials of density in the ratio 3: 1. Then the ratio of acceleration due to gravity g 1 /g 2 at the surface of two planets will be

### Choices

Choice (4) Response

a.

b.

c.

d.

1

## Question number: 21

» Gravitation » Energy

Assertion-Reason▾

### Assertion (Ꭺ)

If an earth satellite moves to a lower orbit, there is some dissipation of energy but the speed of gravitational satellite increases.

### Reason (Ꭱ)

The speed of satellite is a constant quantity.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

## Question number: 22

» Gravitation » Kepler's Laws of Planetary Motion

MCQ▾

### Question

The Jupiter’s period of revolution round the Sun is 12 times that of the Earth. Assuming the planetary orbits are circular, how many times the distance between the Jupiter and Sun exceeds that between the Earth and the sun.

### Choices

Choice (4) Response

a.

5.242

b.

3.242

c.

2.242

d.

4.242

## 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

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