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 |
Â 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: Â Conservation of Mechanical Energy |
Â 80%
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Given below are two statements:
 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.

Subtopic: Â Conservation of Mechanical Energy |
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