# Given below are two statements:  Assertion (A): Though the gravitational force between two particles is central, the force between two finite rigid bodies is not necessarily along the line joining their centre of mass. Reason (R): A spherical shell doesn't shield other bodies outside it from exerting gravitational forces on a particle inside.   1. Both (A) and (R) are true and (R) is the correct explanation of (A). 2. Both (A) and (R) are true but (R) is not the correct explanation of (A). 3. (A) is true but (R) is false. 4. Both (A) and (R) are false.

Subtopic: Â Newton's Law of Gravitation |
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Given below are two statements:
 Assertion (A): Gravitational potential is constant everywhere inside a spherical shell. Reason (R): Gravitational field inside a spherical shell is zero everywhere.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic: Â Gravitational Field |
Â 60%
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Given below are two statements:
 Assertion (A): Work done by the gravitational force is positive when two point masses are brought from infinity to any two points in space. Reason (R): Gravitational potential energy increases during the above process.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Gravitational Potential Energy |
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Given below are two statements:
 Assertion (A): Light from a distant quasar follows a curved path around a black hole. Reason (R): An object curves the space around it due to its mass.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Kepler's Laws |
Â 67%
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Given below are two statements:
 Assertion (A): From a satellite orbiting around earth in a circular orbit, an object is fired in the forward direction. The orbit of the satellite becomes elliptical. Reason (R): When the speed of a satellite is slightly less or more than orbital speed, its orbit is elliptical.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Kepler's Laws |
Â 70%
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Given below are two statements:
 Assertion (A): The gravitational potential energy associated with a particle-earth system depends on the vertical position (or height) of the particle relative to the reference position, not on the horizontal position. Reason (R): For any height h above earth's surface, the potential energy of the particle is mgh

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Gravitational Potential Energy |
Â 50%
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Given below are two statements:
 Assertion (A): The earth is slowing down and as a result, the moon is coming nearer to it. Reason (R): The angular momentum of the earth-moon system is not conserved.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Newton's Law of Gravitation |
Â 52%
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Given below are two statements:
 Assertion (A): The time period of the revolution of a satellite around a planet is directly proportional to the radius of the orbit of the satellite. Reason (R): Artificial satellites do not follow Kepler's law of planetary motion.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic: Â Kepler's Laws |
Â 67%
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Given below are two statements:
 Assertion (A): At the pole, the value of acceleration due to gravity (g) is greater than that at the equator. Reason (R): Earth rotates on its axis in addition to revolving around the sun.-

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Acceleration due to Gravity |
Â 56%
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Given below are two statements:
 Assertion (A): The square of the period of revolution of a planet is proportional to the cube of the semi-major axis of its elliptical orbit. Reason (R): Sun's gravitational field is inversely proportional to the square of its distance from the planet.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic: Â Kepler's Laws |
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