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Q. No.Select the correct option based on the statements given below:
Assertion:
When a ball collides elastically with a floor, it rebounds with the same velocity with which it struck the floor.
Reason:
Momentum of the (earth \(+\) ball) system remains constant.
1.
Both the assertion and reason are true and reason explains the assertion.
2.
Both the assertion and reason are true but reason does not explain the assertion.
3.
Assertion is true but reason is false.
4.
Assertion is false but reason is true.
Subtopic: Â Collisions |
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Given below are two statements:
| Assertion (A): | A quick collision between two bodies is more violent than a slow collision, even when the initial and final velocities are identical. |
| Reason (R): | The change in momentum is greater in the first case. |
| 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 Collisions |
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Given below are two statements:
| Assertion (A): | Water at the foot of the waterfall is always at a different temperature from that at the top. |
| Reason (R): | The potential energy of water at the top is converted into heat energy during falling. |
| 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 Conservation of Mechanical Energy |
 85%
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Given below are two statements:
| Assertion (A): | According to the law of conservation of mechanical energy change in potential energy is equal and opposite to the change in kinetic energy. |
| Reason (R): | Mechanical energy is not a conserved quantity. |
| 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. | (A) is False but (R) is True. |
Subtopic: Â Conservation of Mechanical Energy |
 81%
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Given below are two statements:
| Assertion (A): | When a stationary bomb explodes into two pieces, their speeds are in the inverse ratio of their masses. |
| Reason (R): | The explosion does not violate the law of conservation of linear momentum. |
| 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 Collisions |
 73%
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Given below are two statements:
| Assertion (A): | Work done by friction on a body sliding down an inclined plane is negative. |
| Reason (R): | Work done is less than zero if the angle between force and displacement is acute or both are in the same direction. |
| 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 Concept of Work |
 77%
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Given below are two statements:
| Assertion (A): | The work done on bringing a body down from the top to the base along a frictionless inclined plane is the same as the work done in bringing it down the vertical side. |
| Reason (R): | The gravitational force on the body along the inclined plane is the same as that along the vertical side. |
| 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 Work done by constant force |
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Given below are two statements:
| Assertion (A): | No work is done when an electron completes a circular orbit around the nucleus of an atom. |
| Reason (R): | Work done by a centripetal force is always zero. |
| 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 Concept of Work |
 81%
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Given below are two statements:
| Assertion (A): | Centripetal force does no work. |
| Reason (R): | Force and displacement are perpendicular to each other. |
| 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 Concept of Work |
 84%
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Given below are two statements:
| Assertion (A): | Work done in uniform circular motion is zero. |
| Reason (R): | Force is always directed along displacement. |
| 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 Concept of Work |
 73%
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