Work NEET Questions

Physics - Thermodynamics

Work MCQ Questions


7.
Work done by a system and heat supplied to a system both change the internal energy. The key distinction is:
A.
Heat is always larger than work for the same ΔU change
B.
Heat requires a temperature difference between system and surroundings; work does not require a temperature difference — it is done by mechanical means
C.
Work requires the system to be at absolute zero
D.
Work always increases internal energy; heat may decrease it
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ANSWER :
B. Heat requires a temperature difference between system and surroundings; work does not require a temperature difference — it is done by mechanical means
8.
In an ISOCHORIC (constant volume) process, work done BY the gas is:
A.
ΔW = PΔV = positive
B.
ΔW = ΔQ
C.
ΔW = 0 since ΔV = 0 — no volume change means no work done
D.
ΔW = μRΔT
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ANSWER :
C. ΔW = 0 since ΔV = 0 — no volume change means no work done
9.
In an ISOBARIC (constant pressure) process from temperature T₁ to T₂, work done BY the gas is:
A.
ΔW = ΔU
B.
ΔW = 0
C.
ΔW = μC_vΔT
D.
ΔW = P(V₂−V₁) = μR(T₂−T₁)
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ANSWER :
D. ΔW = P(V₂−V₁) = μR(T₂−T₁)
10.
In an ISOTHERMAL process for an ideal gas expanding from V₁ to V₂ at temperature T, work done BY the gas is:
A.
W = μRT ln(V₂/V₁)
B.
W = P₁(V₂−V₁)
C.
W = μR(T₁−T₂)/(γ−1)
D.
W = μRT(V₂−V₁)
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ANSWER :
A. W = μRT ln(V₂/V₁)
11.
In an ADIABATIC process of an ideal gas from state (P₁,V₁,T₁) to (P₂,V₂,T₂), work done BY the gas is:
A.
W = μR(T₁−T₂)/(γ−1)
B.
W = μRT ln(V₂/V₁)
C.
W = P₁(V₂−V₁)
D.
W = 0
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ANSWER :
A. W = μR(T₁−T₂)/(γ−1)
12.
For an ADIABATIC process, ΔQ = 0. The First Law gives:
A.
ΔU = −ΔW — all work done by gas comes from a decrease in its internal energy
B.
ΔU = ΔQ = 0 also
C.
ΔW = 0
D.
ΔU = ΔW
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ANSWER :
A. ΔU = −ΔW — all work done by gas comes from a decrease in its internal energy