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Basics of Thermodynamics and its First Law
1. A change in the state of gas during which the pressure of the gas remains constant is called …………….change.
A) Adiabatic
B) isothermal
C) isobaric
D) isochoric
2. A change in the state of gas during which the pressure of gas remain constant is called…………..change.
A )Adiabatic
B) isothermal
C) isobaric
D) isochoric
3. The energy store in the substance or system is known as it's ………….energy
A internal
B potential
C kinetic
D pressure
4. A change in the state of gas during which the volume of gas remains constant is called ……….change.
A Adiabatic
B isothermal
C isobaric
D isochoric
5. When there is no temperature difference between the part of system or between the system and it's surrounding then it is said to be in a state of…………
A electrical equilibrium
B thermal equilibrium
C chemical equilibrium
D mechanical equilibrium
6. If two system are separately in thermal equilibrium with the third system then they themselves are in the thermal equilibrium with each other. This is …………
A first law of thermodynamics
B second law of thermodynamics
C law of equilibrium
D Zeroth law of thermodynamics
7. when there is no unbalanced force acting on any part of the system for the system as a whole it is said to be in state of…………
A electrical equilibrium
B thermal equilibrium
C chemical equilibrium
D mechanical equilibrium
8. A system which exchange both mass and energy with and its surrounding is called………..
A closed system
B open system
C isolated system
D equilibrium system
9 . All natural processes are………..
A reversible
B isothermal
C irreversible
D none of the above
10. Isothermal change for a perfect gas takes place at
A constant pressure
B constant volume
C none of these
D constant temperature
11. A system which neither exchange energy nor matter with its surrounding is known as………….
A open system
B isolated system
C closed system
D none of the above
Second and Third Law of Thermodynamics and Entropy
A true
B both are correct
C false
D both are incorrect
2. A reversible cycle has following processes
A 4 isothermal processes
B 4 adiabatic process
C 2 isothermal and 2 adiabatic processes
D none of the mentioned
3. The correct sequence of the processes taking place in a carnot cycle is…….
A adiabatic- adiabatic- isothermal- isothermal
B adiabatic- isothermal- adiabatic_ isothermal
C isothermal-isothermal adiabatic -adiabatic
D isothermal -adiabatic isothermal-adiabatic.
4. The reversed heat engine takes hit from a………. temperature body then discharges it to a…………. temperature body and …………….an inward flow of network.
A high, low, receives
B low, high, receives
C high,low,gives
D low , high , gives
5. Example of reverse heat engine is………….
A heat pump
B refrigerator
C both of the mentioned
D none of the mentioned
6. The efficiency of all reversible heat engines operating between the same heat reservoirs is……
A Same
B independent of the nature of the working substance
C independent of the amount of working substance
D all of this
8. Integral of DQ/T of a reversible heat engine is given by…
A Si-Sf
B Sf-Si
C Si+ Sf
D -Si-Sf
9. Entropy is a……….
A path function, intensive property
B path function, extensive property
C point function intensive property
D point function extensive property
10. For reversible process,
A dS=dQ/T
B dS>dQ/T
C dS<dQ/T
D none of the mentioned
11. For irreversible process,
A dS=dQ/T
B dS>dQ/T
C dS<dQ/T
D none of the mentioned
12. The entropy of an isolated system can never,
A increase
B decrease
C be zero
D none of the mentioned
13. The enthalpy of a substance is defined as
A) H=U-PV
B) H= U+PV
C) H=-U+PV
D) H=-U-PV
14. In a constant volume process, internal energy change is equal to
A heat transferred
B work done
C zero
D none of the mentioned
15. Enthalpy is an intensive property of a system.
A True
B both are correct
C false
D both are incorrect
