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qUESTIONS

Two moles of ideal helium gas are in a rubber balloon at 30°C. The balloon is fully expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is slowly changed to 35°C. The amount of heat required in raising the temperature is nearly (take R = 8.31J/mol.K)

4.0 g of a gas occupies 22.4 litres at STP. The specific heat capacity of the gas at constant volume is 5.0JK^-¹. If the speed of sound in this gas at STP is 952 ms^-¹, then the heat capacity at constant pressure is (Take gas constant R = 8.3 JK^-1mol^-¹)

Thermodynamic processes are indicated in the following diagram

A carnot engine, having an efficiency of η = 1/10 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

Two Carnot engines A and B are operated in succession. The first one, A receives heat from a source at T₁=800 K and rejects to sink at T2 K. The second engine B receives heat rejected by the first engine and rejects to another sink at T3=300 K. If the work outputs of two engines are equal, then the value of T₂ is

The coefficient of performance of a refrigerator is 5 if the temperature inside freezer is -20°C, is temperature of the surroundings to which it rejects heat is

A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power is (Take 1 cal = 4.2 Joules)

The temperature inside a refrigerator is t₂°C and the room temperature is t₁°C. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

In which of the following processes, heat is neither absorbed nor released by a system

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