# Assertion (A): The orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth. Reason (R): The orbital velocity of a satellite is greater than its escape velocity.   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 Orbital velocity |
Â 80%
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Given below are two statements:
 Assertion (A): Generally the path of a projectile from the Earth is parabolic but it is elliptical for a projectile going to a very great height. Reason (R): At the ordinary height, the projectile moves under a uniform gravitational force, but for great heights, the projectile moves under a variable force.
 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 78%
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Given below are two statements:
 Assertion (A): The angular velocity of a planet orbiting around the sun increases when it is nearest to the sun. Reason (R): Angular momentum of a body is proportional to angular velocity.

 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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Given below are two statements:
 Assertion (A): A body becomes weightless at the centre of the earth. Reason (R): As the distance from the centre of earth decreases, acceleration due to gravity increases.

 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 61%
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Given below are two statements:
 Assertion (A): The binding energy of a satellite depends upon the mass of the satellite. Reason (R): Binding energy is the negative value of the total energy of a satellite.

 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 Satellite |
Â 60%
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Given below are two statements:
 Assertion (A): The speed of revolution of an artificial satellite revolving very near the earth is 8 kms-1. Reason (R): Orbital velocity of a satellite becomes independent of the height of the satellite.

 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 Satellite |
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Given below are two statements:
 Assertion (A): The length of the day is slowly increasing. Reason (R): The dominant effect causing a slowdown in the rotation of the earth is the gravitational pull of other planets in the solar system.

 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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Given below are two statements:
 Assertion(A): A planet moves faster when it is closer to the sun in its orbit and vice-versa. Reason(R): Orbital velocity in the orbit of the planet is constant.

 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 55%
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Given below are two statements:
 Assertion (A): The comets do not obey Kepler's law of planetary motion. Reason (R): The comets do not have elliptical orbits.

 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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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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