NEET 2019 · PhysicsPrevious Year Question

In which of the following processes, heat is neither absorbed nor released by a system?

Answer: (B) Adiabatic. \textbf{Answer:} (b) Adiabatic \textbf{Solution:} An adiabatic process is by definition one in which there is no exchange of heat between the system and its surroundings: $Q = 0.$ In the other processes heat is generally exchanged: in an isothermal process heat flows in or out to keep $T$ constant; in an isobaric process $Q = μ C_{P} Δ T \neq = 0$ ; in an isochoric process $Q = μ C_{V} Δ T \neq = 0$ .

A.Isothermal
B.Adiabatic✓
C.Isobaric
D.Isochoric

Correct Answer

(B) Adiabatic

Solution & Explanation

\textbf{Answer:} (b) Adiabatic \textbf{Solution:} An adiabatic process is by definition one in which there is no exchange of heat between the system and its surroundings: $Q = 0.$ In the other processes heat is generally exchanged: in an isothermal process heat flows in or out to keep $T$ constant; in an isobaric process $Q = μ C_{P} Δ T \neq = 0$ ; in an isochoric process $Q = μ C_{V} Δ T \neq = 0$ . Hence heat is neither absorbed nor released only in the \textbf{adiabatic} process, option (b).

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