Gravitation (NEET Physics): Questions 62 - 65 of 82

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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 19th 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

F=km1m2r2

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

Question number: 65

» Gravitation » Universal Law of Gravitation

MCQ▾

Question

A particle is suspended from a spring and it stretches the spring by 3 cm on the surface of earth. The same particle will stretches the same spring at a place 500 km above earth surface by -

Choices

Choice (4) Response

a.

1.25 cm

b.

2π5radhr

c.

2.59 cm

d.

2.58 cm

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