A. Isothermal
B. Isentropic
C. Isobaric
D. Adiabatic
✅ The correct answer is option D.
Thermodynamics MCQs
In case of a reversible process (following pvn = constant), work obtained for trebling the volume (v₁ = 1 m³ and v₂ 3 m³ ) is max imum, when the value of ‘n’ is
A. 0
B. 1
C. 1.44
D. 1.66
✅ The correct answer is option A.
In the reaction, represented by, 2SO₂ + O₂ ⇋ 2SO₃; ΔH = – 42 kcal; the forward reaction will be favoured by
A. Low temperature
B. High pressure
C. Both A and B
D. Neither A nor B
✅ The correct answer is option C.
The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called __________ temperature.
A. Boyle
B. Inversion
C. Critical
D. Reduced
✅ The correct answer is option A.
For the gaseous phase chemical reaction, C₂H₄(g) + H₂O(g) ⟷ C₂H₅OH(g), the equilibrium conversion does not depend on the
A. Steam to ethylene ratio
B. Temperature
C. Pressure
D. None of these
✅ The correct answer is option D.
In Joule-Thomson porous plug experiment, the
A. Enthalpy does not remain constant
B. Entire apparatus is exposed to surroundings
C. Temperature remains constant
D. None of these
✅ The correct answer is option D.
(∂H/∂T)p is the mathematical expression for
A. CV
B. Entropy change
C. Gibbs free energy
D. None of these
✅ The correct answer is option D.
A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg⁻¹. K⁻¹. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg⁻¹ , K⁻¹ is
A. -1.87
B. 0
C. 1.26
D. 3.91
✅ The correct answer is option B.
As the temperature is lowered towards the absolute zero, the value of ∂(ΔF)/∂T, then approaches
A. Unity
B. Zero
C. That of the heat of reaction
D. Infinity
✅ The correct answer is option B.
A gas mixture of three components is brought in contact with a dispersion of an organic phase in water. The degree of freedom of the system are
A. 4
B. 3
C. 5
D. 6
✅ The correct answer is option B.