# Gravitation (NEET Physics): Questions 28 - 31 of 84

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## Question number: 28

» Gravitation » Kepler's Laws of Planetary Motion

MCQ▾

### Question

The semi-major axes of the orbits of mercury and mars are respectively 0.387 and 1.524 in astronomical unit. If the period of Mercury is 0.222 year, what is the period of Mars?

### Choices

Choice (4) Response

a.

1.73 years

b.

1.23 years

c.

3.24 years

d.

1.95 years

## Question number: 29

» 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 5.8 ⨯ 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.

7.5 km/sec, 8.0 minutes

b.

2.7 km/sec, 8.51 minutes

c.

7.75 km/sec, 80.51 minutes

d.

7.5 km/sec, 80.51 minutes

## Question number: 30

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

### Question

A satellite has to revolve round the earth in a circular orbit of radius 6 ⨯ 10 3 km. The velocity of projection of the satellite in this orbit will be -

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 31

» Gravitation » Orbital Velocity of a Satellite

Assertion-Reason▾

### Assertion (Ꭺ)

The speed of revolution of an artificial satellite revolving very near the earth is 8 kms -1.

### Reason (Ꭱ)

Orbital velocity of a satellite, become independent of height of near satellite.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

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

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