A. Process must be isobaric
B. Temperature must decrease
C. Process must be adiabatic
D. Both B. and C.
Related Mcqs:
- An ideal gas is taken around the cycle ABCA as shown in P-V diagram below: The work done by the gas during the cycle is equal to_________________?
A. 12 P1V1
B. 6 P1 V1
C. 3 P1V1
D. P1 V1 - 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 - When a gas in a vessel expands, its internal energy decreases. The process involved is________________?
A. Reversible
B. Irreversible
C. Isothermal
D. Adiabatic - The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)____________________?
A. V1/V2
B. V2/V1
C. V1 – V2
D. V1.V2 - The internal energy of an ideal gas is a function of its _____________ only?
A. Molecular size
B. Volume
C. Pressure
D. Temperature - For an ideal gas, the internal energy depends upon its ____________ only?
A. Molecular size
B. Temperature
C. Volume
D. Pressure - The internal energy of an ideal gas does not change in a reversible _____________ process?
A. Isothermal
B. Adiabatic
C. Isobaric
D. Isometric - Internal energy is independent of the ____________ for an ideal gas?
A. Pressure
B. Volume
C. Both A. & B.
D. Neither A. nor B. - A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?
A. 380
B. 630
C. 760
D. 880 - 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?
A. 4 J
B. ∞
C. 0
D. 8 J
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