Heat NEET Questions

Physics - Thermodynamics

Heat MCQ Questions


13.
In an isothermal expansion of an ideal gas, heat absorbed Q = μRT ln(V₂/V₁). If V₂ = 2V₁ and T = 300 K, μ = 2 mol (R = 8.3 J/mol·K), the heat absorbed is approximately:
A.
2880 J
B.
4160 J
C.
1728 J
D.
3457 J
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ANSWER :
D. 3457 J
14.
In an adiabatic process, the heat exchange ΔQ is:
A.
Equal to PΔV
B.
Equal to work done by the system
C.
Zero — no heat flows between system and surroundings
D.
Equal to change in internal energy
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ANSWER :
C. Zero — no heat flows between system and surroundings
15.
In an isochoric (constant volume) process, the heat supplied ΔQ equals:
A.
Zero — no heat is exchanged in isochoric process
B.
Change in internal energy ΔU — since no work is done (ΔV = 0)
C.
Work done ΔW = PΔV
D.
ΔU + ΔW where both are non-zero
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ANSWER :
B. Change in internal energy ΔU — since no work is done (ΔV = 0)
16.
In an isobaric (constant pressure) process, the heat supplied ΔQ goes to:
A.
Entirely changing the volume
B.
Partly increasing internal energy (ΔU = μC_vΔT) and partly doing work (ΔW = PΔV = μRΔT)
C.
Only work done against atmosphere
D.
Only increasing internal energy
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ANSWER :
B. Partly increasing internal energy (ΔU = μC_vΔT) and partly doing work (ΔW = PΔV = μRΔT)
17.
For a cyclic process (system returns to initial state), the total heat absorbed ΔQ_total equals:
A.
ΔU always
B.
Zero always
C.
Net work done by the system (since ΔU = 0 for complete cycle)
D.
Sum of all internal energy changes
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ANSWER :
C. Net work done by the system (since ΔU = 0 for complete cycle)
18.
Heat Q absorbed by an ideal gas during isothermal expansion from V₁ to V₂ is given by Q = μRT ln(V₂/V₁). For COMPRESSION (V₂ < V₁), this gives Q < 0. This means:
A.
Heat is released by the gas to the reservoir during isothermal compression
B.
The gas absorbs heat during compression
C.
Internal energy decreases during compression
D.
The gas generates heat during compression
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ANSWER :
A. Heat is released by the gas to the reservoir during isothermal compression