Isothermal & Adiabatic Processes NEET Questions

Physics - Thermodynamics

Isothermal & Adiabatic Processes MCQ Questions


13.
An adiabatic process is one in which:
A.
Pressure remains constant
B.
Volume remains constant
C.
No heat flows between the system and surroundings (ΔQ = 0)
D.
Temperature remains constant
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ANSWER :
C. No heat flows between the system and surroundings (ΔQ = 0)
14.
For an adiabatic process of an ideal gas, the relationship between P and V is:
A.
PV = constant
B.
PV^(1/γ) = constant
C.
P/V = constant
D.
PV^γ = constant, where γ = C_p/C_v
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ANSWER :
D. PV^γ = constant, where γ = C_p/C_v
15.
γ (gamma) in the adiabatic equation PV^γ = constant is defined as:
A.
γ = C_p/C_v (ratio of specific heats at constant pressure to constant volume)
B.
γ = C_p − C_v
C.
γ = C_v/C_p
D.
γ = C_p + C_v
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ANSWER :
A. γ = C_p/C_v (ratio of specific heats at constant pressure to constant volume)
16.
For an adiabatic process, ΔQ = 0. From the First Law of Thermodynamics:
A.
ΔU = 0 (same as isothermal)
B.
ΔU = −ΔW — all work done by gas comes from internal energy decrease
C.
ΔW = 0
D.
ΔU = ΔQ = 0
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ANSWER :
B. ΔU = −ΔW — all work done by gas comes from internal energy decrease
17.
Work done by an ideal gas in an adiabatic process from (P₁, V₁, T₁) to (P₂, V₂, T₂) is:
A.
W = nRT ln(V₂/V₁)
B.
W = nRT₁ ln(V₁/V₂)
C.
W = nR(T₁ − T₂)/(γ − 1)
D.
W = P₁(V₂ − V₁)
😑 View Answer Rough Work Error
ANSWER :
C. W = nR(T₁ − T₂)/(γ − 1)
18.
In an adiabatic expansion, the temperature of the gas:
A.
Decreases — gas does work at the expense of its internal energy (ΔU = −ΔW < 0)
B.
Remains constant like isothermal
C.
First decreases then increases
D.
Increases — expansion releases heat
😑 View Answer Rough Work Error
ANSWER :
A. Decreases — gas does work at the expense of its internal energy (ΔU = −ΔW < 0)