# Gravitation (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 60 - 64 of 84

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## Question number: 60

» 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 7 Re? Earth’s mass 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.

b.

c.

d.

## Question number: 61

» Gravitation » Gravitational Acceleration

MCQ▾

### Question

What will be the acceleration due to gravity on the surface of the moon if its radius is th the radius of the earth and its mass is th the mass of the earth

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 62

» Gravitation » Gravitational Acceleration

Assertion-Reason▾

### Assertion (Ꭺ)

There is no effect of rotation of earth on the value of acceleration due to gravity at poles.

### Reason (Ꭱ)

Rotation of earth is about polar axis.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are 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.

Ꭺ is true but Ꭱ is false

## Question number: 63

» Gravitation » Gravitational Acceleration

MCQ▾

### Question

At what height above the earth’s surface the acceleration due to gravity will be of its value at the earth’s surface? (Radius of earth is 6400 km)

### Choices

Choice (4) Response

a.

128 km

b.

128000 km

c.

1280 km

d.

12800 km

## Question number: 64

» Gravitation » Universal Law of Gravitation

MCQ▾

### Question

The gravitational force between two point masses m 1 and m 2 at separation r is given by

The constant k doesn’t

(1) Depend on medium between masses

(2) Depend on the place

(3) Depend on time

(4) Depend on system of units

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

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1,2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

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