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When we rub our hands they become warm. ...

When we rub our hands they become warm. Have we supplied heat to the hands?

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  7. Should the internal energy of a system necessarily increase if its tem...

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  9. A force F is applied on a block of mass M. The block is displaced thro...

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  10. The outer surface of a cylinder containing a gas is rubbed vigorously ...

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  11. When we rub our hands they become warm. Have we supplied heat to the h...

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  12. A closed bottle contains some liquid. The bottle is shaken vigorously ...

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  13. The final volume of a system is equal to the initial volume in a certa...

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  14. Can work be done by a system without changing its volume?

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  15. An ideal gas is pumped into a rigid container having diathermic walls ...

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  16. When a tyre bursts, the air coming out is cooler than the surrounding ...

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  17. When we heat an object, it expands. Is work done by the object in this...

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  18. When we stir a liquid vigorously, it becomes warm. Is it a reversible ...

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  19. What should be the condition for the efficiency of a carnot engine to ...

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  20. When an object cools down, heat is withdrawn from it. Does the entropy...

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