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Q. No.Statement I: Work done by friction is always negative.
Statement II: Kinetic friction is a non-conservative force.
1. Statement I is true, statement II is true and statement I is the correct reason for statement II.
2. Statement I is true, statement II is true, statement I is not the correct reason for statement II.
3. Statement I is true, statement II is false.
4. Statement I is false, statement II is true.
Statement II is true; Statement II is not the correct explanation of Statement IRead more on Sarthaks.com - https://www.sarthaks.com/196003/this-question-has-statement-and-statement-ii-the-four-choices-given-after-the-statement
Subtopic: Concept of Work |
67%
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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 \(\overrightarrow{F}=2\hat i+3\hat j\) is force and \(\overrightarrow{r}=3\hat i-2\hat j\) 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 |
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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 |
80%
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Given below are two statements:
| Assertion (A): | When a stationary bomb exploded into two pieces, their speeds are in the inverse ratio of their masses. |
| Reason (R): | Explosion does not violate 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 |
70%
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