### Class XI

The heat engine takes
1. heat Q1Q1 from a cold reservoir at temperature T1T1, releases heat Q2Q2 to a hot reservoir at temperature T2T2 and delivers work W to the surroundings
2. heat Q1Q1 from a hot reservoir at temperature T1T1 , releases heat Q2Q2 to a cold reservoir at temperature T2T2 and delivers work W to the surroundings
3. heat Q1Q1 from a cold reservoir at temperature T1T1, releases heat Q2Q2 to a cold reservoir at temperature T2T2 and delivers work W to the surroundings
4. heat Q1Q1 from a hot reservoir at temperature T1T1, releases heat Q2Q2 to a hot reservoir at temperature T2T2 and delivers work W to the surroundings
One mole of an ideal gas is heated slowly so that it goes from PV state (PiPi , ViVi) to (3 PiPi , 3 ViVi) in such a way that the pressure of the gas is directly proportional to the volume. How is the temperature of the gas related to its volume during this process?
1. T=(PinRVi)V2
2. T=(PinVi)V2
3. T=(PinRi)V2
4. T=(PinRVi)V
The molar heat capacity of a substance is the
1. quantity of heat needed to raise the temperature of one mole by one degree celsius
2. quantity of heat needed to raise the temperature of one gram by one degree celsius
3. quantity of heat needed to raise the temperature of one mole by one degree Fahrenheit
4. quantity of heat needed to raise the temperature of one kilogram by one degree Fahrenheit
A Carnot engine takes 2000 J of heat from a reservoir at 500 K, does some work, and discards some heat to a reservoir at 350 K. How much heat is discarded?
1. -1300 J
2. -1400 J
3. -1100 J
4. -1300 J
Which of the following statements is correct?
1. The presence of reactants in a closed vessel made up of copper is an example of a closed system.
2. There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
3. The presence of reacting species in a covered beaker is an example of open system
4. The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.
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