(a) Nature of working substance
(b)Temperature of cold reservoirs
(c) Temperature of hot reservoirs
(d) Temperature of cold reservoirs and hot reservoirs
2. All the real heat engine are less efficient than Carnot engine due
(a) Temperature of hot reservoirs
(b) Friction
(c) Temperature of cold reservoirs
(d) Nature of working substance
3. For one mole gas an ideal gas, the equation become
(a) P.V = nRT
(b) P.V = 2RT
(c) P.V = RT
(d) P.V = 3RT
4. The 2nd law of thermodynamic says that transfer of hear is
(a) Reversible
(b) Irreversible
(c) Both
(d) None of These
5. A succession of events which bring the system back to its initial condition is called
(a) cycle
(b) circle
(c) series
(d) parallel
6. Ideal gas equation
(a )PV = nRT
(b) PV = 2RT
(c) PV = RT
(d) PV = 3RT
7. Disorder of system
(a) Entropy
(b) Heat
(c) Internal
(d) External
8. Refigerator
(a) Heat engine in forward order
(b) Heat engine in reverse order
(c) Work on water circulation
(d) Work on water vapours
9. Which is the true for internal energy
(a) state function
(b) Sum of all forms of energy
(c) Proportional to translational kinetic energyte
(d) A.O.T
10. Change of the Entropy depends on
(a) Heat transfer
(b) Mass transfer
(c) Change of temperature
(d) Thermodynamic state
11. When the disorder of the state of system increases, its entropy:
(a) Decreases
(b) Increases
(c) Remain constant
(d) N.O.T
12. First law of thermodynamics is based on which of the following laws
(a) Law of conservation of momentum (P)
(b) Law of conservation of energy (E)
(c) Law of conservation of mass (m)
(d) None of these
13."It is impossible to cause heat to flow from a cold body to a hot body without the expenditure of work." Who gave this statement of second law of thermodynamics?
(a) Rudolf Clauses
(b) Lord Kelvin
(c) Both Rudolf Clauses and Lord Kelvin
(d) N.O.T
14. On what factor or factors, the amount of heat, that flows from one body to another body, depends?
(a) Difference in their masses
(b) Difference in their temperatures
(c) Difference in their shapes
(d) N.O.T
15. The working of a bimetallic thermometer is based on which of the following factors?
(a) Linear thermal expansion
(b) Resistance variation
(c) Volumetric thermal expansion
(d) A.O.T
16. Two rods of iron of same thickness are heated for same time interval using same source of heat. Rod 1 is 1m long and rod 2 is 1.5 m long. Which one of these will expand more?
(a) Rod 1
(b) Both will expand equally
(c) Rod 2
(d) N.O.T
17. What would be the volume, if pressure becomes half at constant temperature?
(a) Volume will become 4 times its original value
(b) Volume will become half of its original value
(c) Volume will remain constant
(d) Volume will be doubled
18. Which of the following is the mathematical expression of First law of thermodynamics for a constant volume process?
(a) Q = ΔU
(b) Q = W
(c) W = ΔU
(d) Q = W+ΔU
19. An ideal gas is allowed to expand adiabatically What will happened to the temperature of the gas?
(a) Temperature will decrease
(b) Temperature will remain same
(c) Temperature will Increase
(d) N.O.T
20. An ideal gas expands adiabatically by doing 47 J of work on the piston.Calculate change in the internal energy of gas
(a) 47 J
(b) Zero
(c) −47 J
(d) N.O.T
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