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Argon gas is at initial temperature 20°C. If gas is expanded adiabatically 8 times to its initial volume then find final temperature of Argon gas?

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Important Questions on Thermodynamics

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The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is 

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1 cm3 of water at 100ºC and 1 atm pressure is heated to convert it to 1521 cm3 vapour. Find increase in internal energy if latent heat of vaporization of water =540 cal g-1.
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Consider the given temperature entropy diagram. Which of the following processes represent increase in volume ?

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An ideal gas undergoes a cyclic process as shown in diagram. The net work done by the gas in the cycle is:-

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A thermodynamic system does 60 J of useful work. If its internal energy decreases by 50 J, then how much heat has been supplied to the system?
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In an adiabatic expansion of 0.5 mole of an ideal diatomic gas, temperature changes from 32ºC to 20ºC. The change in internal energy of the gas is 
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A refrigerator having coefficient of performance 10 absorbs 500 J per cycle. The amount of heat rejected to the surrounding per cycle is:-
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The change in entropy of 1 kg of nitrogen gas in an isobaric process when its temperature changes from 400 K to 800 K is