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. |
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. |
Assertion (A): | Power developed by the tension in the wire during vertical circular motion is always zero. |
Reason (R): | Tension in the wire is equal to the centripetal force acting on the body under vertical circular 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. |