1. In an isothermal process a. No heat exchange occurs b. Volume remains constan

Question

1. In an isothermal process a. No heat exchange occurs b. Volume remains constant c. Pressure remains constant d. Temperature remains constant 2. In an adiabatic process a. No heat exchange occurs b. Volume remains constant c. Pressure remains constant d. Temperature remains constant 3. If you try to cool your kitchen on a hot day by opening your refrigerator door, the temperature in your kitchen will a. Decrease b. Increase c. Remain unchanged 4. Entropy can be a. Both created and destroyed b. Created but not destroyed c. Destroyed but not created d. Neither created nor destroyed 5. To maximize the efficiency of a heat engine a. Tc=100TH b. TH=100Tc c. Tc=0K d. TH=0K 6. It is possible to wholly convert a given amount of heat energy into mechanical energy a. True b. False 7. It is possible to totally convert a given amount of mechanical energy into heat a. True b. False 8. The first law of thermodynamics is a restatement of the a. Principle of entropy b. Law of heat addition c. Carnot cycle d. Conservation of energy e. None of the above 9. For a heat engine, the greater the temperature difference between the input reservoir and the output reservoir, the a. Greater the efficiency b. Less the efficiency c. Neither, efficiency doesn’t depend on temperature difference 10. When a volume of air is compressed and no heat enters or leaves, the air temperature will a. Increase b.Decrease c. Remain unchanged

Explanation / Answer

1. isothermal process

d. Temperature remains constant

2. Adiabatic process

a. No heat exchange occurs

3.

when the door of the refrigerator left opened, the refrigerator takes heat from the room and ejects more heat from back of it and thereby makes the kitchen more hot

hence temperature increase

b

5.

efficiency = 1 - Tc/Th

at Tc = 0 , efficiency is maximum = 1

hence C

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