Gravitation (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 1 - 4 of 7

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Question number: 1

» Gravitation » Kepler's Laws of Planetary Motion

Appeared in Year: 2010

MCQ▾

Question

A comet (assumed to be in an elliptical orbit around the sun) is at a distance of 0.4 AU from the sun at the perihelion. If the time period of the comet is 125 years, what is the aphelion distance? AU: Astronomical Unit.

Choices

Choice (4) Response

a.

24.6 AU

b.

25 AU

c.

49.6 AU

d.

50 AU

Question number: 2

» Gravitation » Universal Law of Gravitation

Appeared in Year: 2010

MCQ▾

Question

A certain planet completes one rotation about its axis in time T. The weight of an object placed at the equator on the planet’s surface is a fraction f (f is close to unity) of its weight recorded at a latitude of 600. The density of the planet assumed to be a uniform perfect sphere is given by –

Choices

Choice (4) Response

a.

4f1+f3π4GT2

b.

43f1f3π4GT2

c.

4f1f3π4GT2

d.

42f1f3π4GT2

Question number: 3

» Gravitation » Orbital Velocity of a Satellite

Appeared in Year: 2012

MCQ▾

Question

A small asteroid is orbiting around the sun in a circular orbit of radius r0 with speed V0. A rocket is launched from the asteroid with speed V = αV0, where V0 is the speed relative to the sun. The highest value of α for which the rocket will remain bound to the solar system is (ignoring gravity due to the asteroid and effects of other planets) –

Choices

Choice (4) Response

a.

3

b.

2

c.

1

d.

2

Question number: 4

» Gravitation » Escape Velocity

MCQ▾

Question

If the escape velocity from the earth is about 18kms , then the escape velocity from a planet having twice the radius and the same mean density as the earth is –

Choices

Choice (4) Response

a.

36kms

b.

3kms

c.

9kms

d.

18kms

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