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Q. No.Given below are two statements:
Assertion (A):
Work done by friction is always negative.
Reason (R):
Kinetic friction is a non-conservative 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.
(A) is False but (R) is True.
Subtopic: Concept of Work |
70%
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Given below are two statements:
| Assertion (A): | The net work done by gravity is equal to the loss in the vertical component of the kinetic energy for a projectile. |
| Reason (R): | The work-energy theorem applies to all systems including projectiles. |
| 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: Work Energy Theorem |
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Given that \(\vec{F}=2\hat i+3\hat j\) is force and \(\vec{r}=3\hat i-2\hat j\) is the displacement vector. Which of the following statements is correct?
| 1. | Work done is zero, torque is \(13\) units. |
| 2. | Work done is \(13\) units, torque is zero. |
| 3. | Both work done and torque are zero. |
| 4. | Both work done and torque are \(13\) units. |
Subtopic: Work done by constant force |
77%
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Given below are two statements:
| Assertion (A): | Two particles moving in the same direction do not lose all their energy in a completely inelastic collision. |
| Reason (R): | Principle of conservation of momentum holds true for all kinds of collisions. |
| 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: Collisions |
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Given below are two statements:
| Assertion (A): | In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision. |
| Reason (R): | In an elastic collision, the linear momentum of the system is 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: Collisions |
51%
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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: 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: 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: Conservation of Mechanical Energy |
84%
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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: 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: Collisions |
72%
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