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A gas is enclosed in a cylindrical vessel fitted with a frictionless piston. The gas is slowly heated for some time. During the process, 10 J of heat is supplied and the piston is found to move out 10 cm. The area of cross-section of the cylinder `=4cm^2` and the atmospheric pressure `=100kPa`.

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Slowly i.e. pressure is constant
`P=P_0` atmosheric pressure
`DeltaW=PDeltaV=P_0Ax`
`=100xx10^3xx4xx10^-4xx0.1`
`=4J`
From first law of thermodynamics
`DeltaQ=DeltaU+DeltaW`
`10=DeltaU+4`
`DeltaU=6j`
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CP SINGH-LAWS OF THERMODYNAMICS-EXERCISE
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  2. The first law of thermodynamics incorporates are concept (i) conserv...

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  3. The work done in the process AB is

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  4. (i) DeltaW(AB)=5P0V0 (ii) DeltaW(BC)=0 (iii) DeltaW(CA)=-2P0V0 (...

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  5. Consider the process on a system shown in figure. During the process, ...

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  6. Consider two processes on a system as shown in figure. The volumes in...

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  7. A system can be taken from the initial state p(1),V(1) to the final st...

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  8. In the figure given two processes A and B are shown by which a thermod...

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  9. Refer to figure in previous question, DeltaU(1) and DeltaU(2) be the c...

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  10. Refer to figure DeltaU(1) and DeltaU(2) be the changes in internal ene...

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  11. In a given process on an ideal gas, dW=0 and dQlt0. Then for the gas

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  12. Consider the following two statements. (A) If heat is added to a syst...

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  13. In a process on a system, the initial pressure and volume are equal to...

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  14. The pressure p and volume V of an ideal gas both increase in a process...

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  15. The state of a thermodynamic system is represented by

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  16. Which of the following is not a thermodynamical function

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  17. If Q, E and W denote respectively the heat added, change in internal e...

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  18. For free expansion of the gas, which of the following is true?

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  19. A system is given 300 calories of heat and it does 600 joules of work....

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  20. In thermodynamic process, pressure of a fixed mass of a gas is changes...

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  21. A perfect gas goes from a state A to another state B by absorbing 8 × ...

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