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Q. No.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 |
From NCERT
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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 |
 54%
From NCERT
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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 |
From NCERT
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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 |
From NCERT
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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 |
 57%
From NCERT
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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 |
 68%
From NCERT
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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 |
 51%
From NCERT
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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 |
 60%
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