Gravitation (NEET Physics): Questions 44 - 47 of 84

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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 Equation 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

Question number: 47

» Gravitation » Universal Law of Gravitation

MCQ▾

Question

Which of the following statements about the gravitational constant are false?

(1) It is a force

(2) It has no unit

(3) It has same value in all system of units

(4) It doesn’t depend on the value of the masses

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

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 2 are correct

c.

1, 2 and 3 are correct

d.

1 and 3 are correct

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