Gravitation (NEET Physics): Questions 43 - 46 of 82

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Question number: 43

» Gravitation » Energy

MCQ▾

Question

A body of mass 250 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.

1.56 ⨯ 10 10 J

b.

2.27 ⨯ 10 10 J

c.

2.54 ⨯ 10 9 J

d.

1.27 ⨯ 10 9 J

Question number: 44

» Gravitation » Orbital Velocity of a Satellite

MCQ▾

Question

The speed with which the earth have to rotate on its axis so that a person on the equator would weigh (35) the as much as present will be - (Take the equatorial radius as 6400 km. )

Choices

Choice (4) Response

a.

7.28 ⨯ 10 -3 rad/sec

b.

3 28 ⨯ 10 -3 rad/sec

c.

3 28 ⨯ 10 -4 rad/sec

d.

7.83 ⨯ 10 -4 rad/sec

Question number: 45

» Gravitation » Gravitational Acceleration

MCQ▾

Question

On a planet (whose size is the same as that of earth and mass 4 times to the earth) the energy needed to lift a 2 kg mass vertically upwards through 2 m distance on the planet is (g = l0 m/sec 2 on the surface of earth) –

Choices

Choice (4) Response

a.

160 J

b.

320 J

c.

16 J

d.

32 J

Question number: 46

» Gravitation » Gravitational Acceleration

Assertion-Reason▾

Assertion (Ꭺ)

The universal gravitational constant is same as acceleration due to gravity.

Reason (Ꭱ)

Gravitational constant and acceleration due to gravity have different dimensional formula.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

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

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