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We consider a thermodynamic system. If D...

We consider a thermodynamic system. If `DeltaU` represents the increase in its internal energy and W the work done by the system, which of the following statements is true?

A

`DeltaU=-W` in an adiabatic process

B

`DeltaU=W` in an isothermal process

C

`DeltaU=-w` in an isothermal process

D

`DeltaU=W`in an isothermal process

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The correct Answer is:
A
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The first law of thermodynamics was given as q=DeltaU+(-w) , where q is heat given to a system and DeltaU represents increase in internal energy and -w is work done by the system. Various processes such as isothermal, adiabatic, cyclic, isobaric and isochoric process in terms of I law of thermodynamics leads for important results. The molar heat capacity for 1 mole of monoatomic gas is 3/2 R at constant volume and 5/2 R at constant pressure. 1 mole of a monoatomic gas is expanded through path ABC as shown in figure: select the correct statements:

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