MCQ
Work done by a body against friction always results in:
- ALoss in kinetic energy.
- BLoss in potential energy.
- CGain in kinetic energy.
- DGain in potential energy.
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Assertion $A$ : When a rod lying freely is heated, no thermal stress is developed in it.
Reason $R :$ On heating the length of the rod increases.
In the light of the above statements, choose the correct answer from the options given below