Solved: PHYSICS Question for NEET

NEET PHYSICSMedium

Thermodynamic processes are indicated in the following diagram. Match the following:

Column I P. Process I Q. Process II R. Process III S. Process IV

Column II a. Adiabatic b. Isobaric c. Isochoric d. Isothermal

$P \rightarrow a, Q \rightarrow c, R \rightarrow d, S \rightarrow b$

$P \rightarrow c, Q \rightarrow a, R \rightarrow d, S \rightarrow b$

$P \rightarrow c, Q \rightarrow d, R \rightarrow b, S \rightarrow a$

$P \rightarrow c, Q \rightarrow d, R \rightarrow a, S \rightarrow b$

In a $P$ - $V$ indicator diagram:

Process I is parallel to the $P$ -axis, meaning the volume is constant. Therefore, it is an isochoric process ( $P \rightarrow c$ ).
Process IV is parallel to the $V$ -axis, meaning the pressure is constant. Therefore, it is an isobaric process ( $S \rightarrow b$ ).
Processes II and III are curves representing expansion. The slope of an adiabatic curve ( $dp/dV = -\gamma P/V$ ) is $\gamma$ times steeper than that of an isothermal curve ( $dp/dV = -P/V$ ). Since curve II is steeper than curve III, Process II is adiabatic ( $Q \rightarrow a$ ) and Process III is isothermal ( $R \rightarrow d$ ).

Thus, the correct match is $P \rightarrow c, Q \rightarrow a, R \rightarrow d, S \rightarrow b$ .

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