Refrigeration capacity of a household refrigerator may be round about ___ tons:
A. 0.15
B. 1.5
C. 4.5
D. 6.5
Which is not constant for an ideal gas:
A. (∂P/∂V)T
B. (∂V/∂T)P
C. (∂P/∂V)V
D. All (A), B. & (C)
Any substance above its critical temperature exists as:
A. Saturated vapour
B. Solid
C. Gas
D. Liquid
The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is:
A. 0
B. +ve
C. -ve
D. ∞
In polytropic process (PVn = constant), if n = 1; it means a/an ____ process:
A. Adiabatic
B. Reversible
C. Isothermal
D. None of these
Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass:
A. dE = Tds – PdV
B. dQ = CvdT + PdV
C. dQ = CpdT + Vdp
D. Tds = dE – PdV
The internal energy of a gas obeying P (V – b) RT (where, b is a positive constant and has a constant Cv), depends upon its:
A. Pressure
B. Volume
C. Temperature
D. All A, B. & C
If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be _____ c.c:
A. 100
B. 50
C. 205
D. 200
All gases above its inversion temperature, in a throttling process will show:
A. A heating effect
B. No change in temperature
C. A cooling effect
D. Either A. or (C)
With increase in temperature, the internal energy of a substance:
A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depends on the substance
