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1. Which of the following relations is correct for an adiabatic process?
A. P∆V = 0
B. ∆U = q
C. ∆q = 0
D. q = + w
2. A system absorbs 500 kJ heat and performs 250 kJ work on the surroundings. The increase in internal energy of the system is:
A. 250 kJ
B. 750 kJ
C. 500 kJ
D. 1000 kJ
3. The enthalpies of all elements in their standard states are
A. negative
B. zero
C. infinite
D. positive
4. If q amount of heat is supplied to a system, the work done by the system is w . What is the change in internal energy of the system?
A. ΔU = q - w
B. ΔU = q / w
C. ΔU = q + w
D. ΔU = q x w
5. The internal energy of a system is
A. Kinetic as well as potential energy
B. Potential energy only
C. Unpredictable
D. Kinetic energy only
6. The process in which no exchange of heat takes place between system and surrounding is known as
A. Adiabatic process
B. Isothermal process
C. Isobaric process
D. Isochoric process
7. Evaporation of water is:
A. An exothermic change.
B. A process accompanied by chemical reaction.
C. An endothermic change.
D. A process in which no heat changes occur.
8. Which of the following is a state function?
A. Heat
B. Internal energy
C. Pressure
D. Volume
9. Tea placed in a closed vessel is an example of
A. isolated system
B. closed system
C. insulated system
D. open system
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