411. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.
A. 270
B. 327
C. 300
D. 540
✅ The correct answer is option B.
Thermodynamics MCQs
412. dW and dq are not the exact differential, because q and W are
A. State functions
B. Path functions
C. Intensive properties
D. Extensive properties
✅ The correct answer is option B.
413. Entropy, which is a measure of the disorder of a system is
A. Independent of pressure
B. Independent of temperature
C. Zero at absolute zero temperature for a perfect crystalline substance
D. All of the above
✅ The correct answer is option C.
414. For an ideal gas, the internal energy depends upon its __________ only.
A. Molecular size
B. Temperature
C. Volume
D. Pressure
✅ The correct answer is option B.
415. Equation which relates pressure, volume and temperature of a gas is called the
A. Equation of state
B. Gibbs Duhem equation
C. Ideal gas equation
D. None of these
✅ The correct answer is option A.
416. The main feature of Carnot refrigeration cycle is that, it
A. Does not need the addition of external work for its functioning
B. Transfers heat from high temperature to low temperature
C. Accomplishes the reverse effect of the heat engine
D. None of these
✅ The correct answer is option C.
417. Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be
A. Same
B. Doubled
C. Halved
D. One fourth of its original value
✅ The correct answer is option A.
418. In case of an __________ process, the temperature of the system increases.
A. Isothermal compression
B. Isothermal expansion
C. Adiabatic expansion
D. Adiabatic compression
✅ The correct answer is option D.
419. Which law of the thermodynamics provids basis for measuring the thermodynamic property?
A. First law
B. Zeroth law
C. Third law
D. Second law
✅ The correct answer is option B.
420. What happens in a reversible adiabatic expansion process?
A. Heating takes place
B. Cooling takes place
C. Pressure is constant
D. Temperature is constant
✅ The correct answer is option B.