# Gravitation-Energy [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 10

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## Question number: 1

» Gravitation » Energy

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MCQ▾

### Question

A projectile is fired vertically upward from the surface of earth with a velocity . where is the escape velocity and K < 1. Neglecting air resistance, the maximum height to which it will rise measured from the center of the earth is - (where R = radius of earth)

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 2

» Gravitation » Energy

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MCQ▾

### Question

A body of mass 100 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.

6.27 ⨯ 10 9 J

b.

6.27 ⨯ 10 8 J

c.

6.27 ⨯ 10 10 J

d.

6.27 ⨯ 10 7 J

## Question number: 3

» Gravitation » Energy

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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.

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

c.

Ꭺ is false but Ꭱ is true

d.

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

## Question number: 4

» Gravitation » Energy

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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.

b.

c.

d.

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