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General
Easy
Question
2k-mol of an ideal diatomic gas is enclosed in a vertical cylinder fitted with a piston and spring as shown in the figure. Initially the spring is compressed by 5 cm and then the electric heater starts supplying energy to the gas at constant rate of 100 J/S and due to conduction through walls of cylinder and radiation, 20 J/S has been lost to surroundings ( Take K=1000 N/m,
atomospheric pressure, 
, cross section area of piston 
, mass of piston m=1 kg R=8.3kj mol k) Answer the given question based on this information.
Work done by the gas in 5 s is
- 300 J
- 400 J
- 114.3 J
- 153.6 J
The correct answer is: 114.3 J
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