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qUESTIONS

A system goes from A to B via two processes I and II as shown in figure. If ΔU₁ and ΔU2 are the changes in internal energies in the processes I and II respectively, then

A thermally insulated rigid container contains an ideal gas heated by a filament of resistance 100 Ω through a current of 1A for 5 min then change in internal energy is

Which of the following statements is correct for any thermodynamic system?

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

A monoatomic ideal gas, initially at temperature T1, is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T2 by releasing the piston suddenly. If L1 and L₂ are the lengths of the gas column before and after expansion respectively, then T1/T2 is given by

A diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle the volume of the gas increases from V to 32 V, the efficiency of the engine is

Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion, the average time of collision between molecules increases as V^q, where V is the volume of the gas. The value of q is (γ=Cp/Cv)

Consider a spherical shell of radius R at temperature T. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume u= U/V α T^ 4 and pressure P = 1/3 x (U/V) If the shell now undergoes an adiabatic expansion the relation between T and R is

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

1 2 3 4 5 6 7 8 9

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