A. P ∝ 1/V, when temperature is constant
B. P ∝ 1/V, when temperature & mass of the gas remain constant
C. P ∝ V, at constant temperature & mass of the gas
D. P/V = constant, for any gas
✅ The correct answer is option B.
Thermodynamics MCQs
312. The internal energy of an incompressible fluid depends upon its
A. Pressure
B. Temperature
C. Both A & B
D. Neither A nor B
✅ The correct answer is option B.
313. Entropy of an ideal gas depends upon its
A. Pressure
B. Temperature
C. Both A & B
D. Neither A nor B
✅ The correct answer is option C.
314. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is
A. Positive
B. Negative
C. Zero
D. Infinity
✅ The correct answer is option C.
315. The principle applied in liquefaction of gases is
A. Adiabatic expansion
B. Joule-Thomson effect
C. Both A and B
D. Neither A nor B
✅ The correct answer is option C.
316. Chemical potential is a/an
A. Extensive property
B. Intensive property
C. Force which drives the chemical system to equilibrium
D. Both B and C
✅ The correct answer is option D.
317. Steam undergoes isentropic expansion in a turbine from 5000 kPa and 400°C (entropy = 6.65 kJ/kg K) to 150 kPa) (entropy of saturated liquid = 1.4336 kJ/kg . K, entropy of saturated vapour = 7.2234 kJ/kg. K) The exit condition of steam is
A. Superheated vapour
B. Partially condensed vapour with quality of 0.9
C. Saturated vapour
D. Partially condensed vapour with quality of 0.1
✅ The correct answer is option A.
318. Specific heat of a gas for a reversible adiabatic process is
A. Negative
B. Zero
C. Infinity
D. None of these
✅ The correct answer is option B.
319. Heat pump
A. Accomplishes only space heating in winter
B. Accomplishes only space cooling in summer
C. Accomplishes both A and B
D. Works on Carnot cycle
✅ The correct answer is option C.
320. A domestic refrigerator has a/an __________ cooled condenser.
A. Water
B. Air
C. Evaporative
D. Gas
✅ The correct answer is option B.