In an irreversible process:
A. Tds = dE – dW = 0
B. dE – dW – Tds = 0
C. Tds – dE + dW < 0
D. Tds – dT + dW < 0
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
The work done in an adiabatic change in a particular gas depends upon changes in the ____ only:
A. Temperature
B. Specific heat
C. Volume
D. Pressure
Entropy change for an irreversible isolated system is:
A. ∞
B. 0
C. < 0
D. > 0
_____ law of thermodynamics ascertains the direction of a particular spontaneous process:
A. Zeroth
B. First
C. Second
D. Third
On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will:
A. Increase
B. Decrease
C. Remain same
D. Increase in summer and will decrease in winter
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
Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of:
A. Solution
B. Vaporisation
C. Formation
D. Sublimation
What happens in a reversible adiabatic expansion process:
A. Heating takes place
B. Cooling takes place
C. Pressure is constant
D. Temperature is constant
Number of phases in a colloidal system is:
A. 1
B. 2
C. 3
D. 4
