Gravitation - CBSE STD 12 Science JEE physics Questions

Q 1Assertion & Reason1 Mark

Assertion : For the planets orbiting around the sun, angular speed, linear speed, K.E. changes with time, but angular momentum remains constant.
Reason : No torque is acting on the rotating planet. So its angular momentum is constant.

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Q 2Assertion & Reason1 Mark

Assertion : Gravitational field is zero both at centre and infinity.
Reason : The dimensions of gravitational field is $\left[L T^{-2}\right]$.

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Q 3Assertion & Reason1 Mark

Assertion : The speed of revolution of an artificial satellite revolving very near the earth is $8 \mathrm{kms}^{-1}$.
Reason : Orbital velocity of a satellite, become independent of height of near satellite.

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Q 4Assertion & Reason1 Mark

Assertion : The speed of satellite always remains constant in an orbit.
Reason : The speed of a satellite depends on its path.

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Q 5Assertion & Reason1 Mark

Assertion : A person sitting in an artificial satellite revolving around the earth feels weightless.
Reason : There is no gravitational force on the satellite.

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Q 6MCQ1 Mark

If the density of a small planet is the same as that of earth, while the radius of the planet is 0.2 times that of the earth, the gravitational acceleration on the surface of that planet is

✓
$0.2 \mathrm{~g}$
B
$0.4 \mathrm{~g}$
C
$2 g$
D
$4 g$

Answer: A.

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Q 7MCQ1 Mark

A person sitting in a chair in a satellite feels weightless because

A
The earth does not attract the objects in a satellite
B
The normal force by the chair on the person balances the earth's attraction
✓
The normal force is zero
D
The person in satellite is not accelerated

Answer: C.

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Q 8MCQ1 Mark

A satellite moves round the earth in a circular orbit of radius $R$ making one revolution per day. A second satellite moving in a circular orbit, moves round the earth once in 8 days. The radius of the orbit of the second satellite is

A
$8 R$
✓
$4 R$
C
$2 R$
D
$R$

Answer: B.

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Q 9MCQ1 Mark

In an elliptical orbit under gravitational force, in general

A
Tangential velocity is constant
B
Angular velocity is constant
C
Radial velocity is constant
✓
Areal velocity is constant

Answer: D.

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Q 10MCQ1 Mark

In the previous question the orbital velocity of the planet will be minimum at

A
$\mathrm{A}$
B
$\mathrm{B}$
✓
$\mathrm{C}$
D
$\mathrm{D}$

Answer: C.

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Gravitation question types

Gravitation questions

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Gravitation JEE physics - Gravitation

Gravitation question types

Gravitation questions

Generate a Gravitation paper free