For one complete cycle of a thermodynamic processes on a gas as shown in P-V diagram. Which is true

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11.Thermodynamics

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For one complete cycle of a thermodynamic processes on a gas as shown in $P-V$ diagram. Which is true

A

$\Delta U = 0\,;\,Q < 0$

B

$\Delta U > 0;\,Q < 0$

C

$\Delta U = 0;\,Q > 0$

D

$\Delta U < 0;\,Q > 0$

Solution

State function

$(\Delta \mathrm{U})_{\text {cycle }}=0$

and (work) $=-$ ve [anticlockwise]

using $FLOT$

$\mathrm{Q}=\Delta \mathrm{U}+\mathrm{W}$

also $(\mathrm{Q}=-\mathrm{ve})$

Standard 11

Physics

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