201. 1/V (∂V/∂T)p is the mathematical expression
A. Joule-Thomson co-efficient
B. Specific heat at constant pressure (Cp)
C. Co-efficient of thermal expansion
D. Specific heat at constant volume (CV)
✅ The correct answer is option C.
Thermodynamics MCQs
202. Throttling (Joule-Thomson effect) process is a constant __________ process.
A. Enthalpy
B. Entropy
C. Pressure
D. None of these
✅ The correct answer is option A.
203. Claude gas liquefaction process employs cooling
A. At constant pressure
B. By throttling
C. By expansion in an engine
D. None of these
✅ The correct answer is option C.
204. Fundamental principle of refrigeration is based on the __________ law of thermodynamics.
A. Zeroth
B. First
C. Second
D. Third
✅ The correct answer is option C.
205. Which is an example of closed system?
A. Air compressor
B. Lquid cooling system of an automobile
C. Boiler
D. None of these
✅ The correct answer is option B.
206. The partial pressure of each constituent present in an alloy is __________ the total vapor pressure exerted by the alloy.
A. Less than
B. Equal to
C. More than
D. Either B or C; depends on the type of alloy
✅ The correct answer is option A.
207. The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.
A. Increases
B. Decreases
C. Remains unchanged
D. Decreases linearly
✅ The correct answer is option A.
208. If the heat of solution of an ideal gas in a liquid is negative, then its solubility at a given partial pressure varies with the temperature as
A. Solubility increases as temperature increases
B. Solubility increases as temperature decreases
C. Solubility is independent of temperature
D. Solubility increases or decreases with temperature depending on the Gibbs free energy change of solution
✅ The correct answer is option B.
209. Joule-Thomson effect i.e., a throttling process is a constant __________ process.
A. Entropy
B. Temperature
C. Internal energy
D. Enthalpy
✅ The correct answer is option D.
210. In any spontaneous process, the __________ free energy decreases.
A. Helmholtz
B. Gibbs
C. Both A & B
D. Neither A nor B
✅ The correct answer is option C.