A. Adiabatic
B. Reversible
C. Isothermal
D. None of these
✅ The correct answer is option C.
Thermodynamics MCQs
Joule-Thomson co-efficient depends on the
A. Pressure
B. Temperature
C. Both A & B
D. Neither A nor B
✅ The correct answer is option C.
The ammonia synthesis reaction represented by N₂ + 3H₂ ⇋ 2NH₃ ; ΔH = – 22.4 kcal, is
A. Endothermic
B. Exothermic
C. Isothermal
D. Adiabatic
✅ The correct answer is option B.
Charles’ law for gases states that
A. V/T = Constant
B. V ∝ 1/T
C. V ∝ 1/P
D. PV/T = Constant
✅ The correct answer is option A.
COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about
A. 0.5
B. 3.5
C. 4.5
D. 8.5
✅ The correct answer is option B.
An isolated system can exchange __________ with its surroundings.
A. Matter
B. Energy
C. Neither matter nor energy
D. Both matter and energy
✅ The correct answer is option C.
The specific heat of saturated water vapour at 100°C is
A. ∞
B. -ve
C. 0
D. +ve
✅ The correct answer is option B.
The efficiency of a Carnot heat engine operating between absolute temperatures T₁ and T₂ (when, T₁ > T₂) is given by (T₁ – T₂)/T₁. The co-efficient of performance (C.O.P.) of a Carnot heat pump operating between T₁ and T₂ is given by
A. T₁/(T₁-T₂)
B. T₂/(T₁-T₂)
C. T₁/T₂
D. T₂/R1
✅ The correct answer is option A.
Entropy change in case of reversible adiabatic process is
A. Minimum
B. Zero
C. Maximum
D. Indeterminate
✅ The correct answer is option B.
In an irreversible process
A. Tds = dE – dW = 0
B. DE – dW – Tds = 0
C. Tds – dE + dW< 0
D. Tds – dT + dW< 0
✅ The correct answer is option C.