Q14 of 27 Page 87

If a refrigerator’s door is kept open, will the room become cool or hot? Explain.

If the refrigerator’s door is kept open the room will get

warmer because with the door open the temperature will start to


rise inside the refrigerator. The thermostat will kick in and try to


cool it back down. This means the motor is running which means heat is being added to the room.


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12

Can a system be heated and its temperature remains constant?

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A system goes from P to Q by two different paths in the P-V diagram as shown in Fig. 12.8. Heat given to the system in path 1 is 1000 J. The work done by the system along path 1 is more than path 2 by 100 J. What is the heat exchanged by the system in path 2?

 15

Is it possible to increase the temperature of a gas without adding heat to it? Explain.

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Air pressure in a car tyre increases during driving. Explain.