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Physics

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12. The molar heat capacity in a process of a diatomic gas if it does a work of  Q/4 when a heat of Q is supplied to it is

(a) (2/5)R                                    (b)...

11. A cylindrical tube of uniform cross-sectional area A is fitted with two air tight frictionless pistons. The pistons are connected to each other by a metallic wire. Initially the pressure of the gas is

P0 and temperature is T0, atmospheric pressure is also P0. Now the temperature of the gas is increased to 2T0,...

10. Work done by a system under isothermal change from a volume

V1 to V2  for a gas which obeys Vander Waal’s equation (V-βn)[P+(αn2/V)]=nRT (a) nRT loge  [ (V2-nβ)/( V1-nβ) ]+αn2[(V1 –...

9. An ideal gas expands isothermally from a volume

V1 to V2 and then compressed to original volume V1 adiabatically. Initial pressure is P1  and final pressure is P3...

8. A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

(a)  4 RT                                    (b)  15 RT (c)   9 RT                                    (d)  11 RT Answer-d (6)

7. A mono atomic gas is supplied the heat Q very slowly keeping the pressure constant. The work done by the gas will be

(a)   (2/3)Q                                  (b) (3/5)Q...

A closed hollow insulated cylinder is filled with gas

at 00C and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas...

5. A monoatomic ideal gas, initially at temperature

T1, is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a...

4. Two identical containers A and B with frictionless pistons contain the same ideal gas at the same temperature and the same volume V.

The mass of the gas in A is mB and that in B  is . The gas in each cylinder...

34. Which of the following processes is reversible

(a)      Transfer of heat by radiation (b)  Electrical heating of a nichrome wire (c)   Transfer of heat by conduction (d) ...

3. During the melting of a slab of ice at 273 K at atmospheric pressure

(a)  Positive work is done by ice-water system on the atmosphere (b)  Positive work is done on the ice-water system...

2. 1cm3 of water at its boiling point absorbs 540 calories of heat to become steam with a

volume of 1671 cm3 .If the atmospheric pressure = 1.013 x 105 N/m3 and the mechanical equivalent of heat =...

1. When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas, is

(a) 2/5                                    (b)...

33. An ideal gas heat engine operates in Carnot cycle

between 227°C and 127°C. It absorbs 6 x 104 cals of heat at higher temperature. Amount of heat converted to...

32. An engine is supposed to operate between two reservoirs

at temperature 727°C and 227°C. The maximum possible efficiency of such an engine is (a)  1/2                                     (b)  1/4 (c)  ...

31. In a mechanical refrigerator, the low temperature coils are at a temperature

of – 23°C and the compressed gas in the condenser has a temperature of 27°C. The theoretical coefficient of performance...

30. An ideal refrigerator has a freezer at a temperature of

-130c .  The coefficient of performance of the engine is 5. The temperature of the air (to which heat is...

29. An ideal heat engine working between temperature

T1­ and T2 has an efficiency η, the new efficiency if both the source and sink temperature are doubled, will...

11. A Carnot’s engine used first an ideal monoatomic gas then an ideal diatomic gas. If the source and sink temperature are 411°C  and 69°C   respectively and the engine extracts 1000 J of heat in each cycle, then area enclosed by the PV diagram is 

(a)  100 J                                  (b)  300 J (c)   500 J                                  (d)  700 J Answer-c (15)

13. The temperature of sink of Carnot engine is 27°C. Efficiency of engine is 25%. Then temperature of source is

(a)  227°C                                        (b) 327°C (c) 127°C                             ...

28. The efficiency of Carnot engine when source temperature is

T1 and sink temperature is T2 will be (a) (T1 –  T2)/ T1               ...

27. For which combination of working temperatures the efficiency of Carnot’s engine is highest

(a)  80 K, 60 K                                  (b)  100 K, 80 K (c)   60 K, 40 K           ...

26. The first operation involved in a Carnot cycle is

(a)  Isothermal expansion           (b)  Adiabatic expansion (c)  Isothermal compression       (d)   Adiabatic compression Answer-a (22)

25. A Carnot engine takes

3×106 cal. of heat from a reservoir at 627°C, and gives it to a sink at 27°C. The work done...

24. “Heat cannot by itself flow from a body at lower temperature to a body at higher temperature” is a statement or consequence of

(a)  Second law of thermodynamics            (b)  Conservation of momentum (c)   Conservation of mass            (d)  First law of thermodynamics...

23. Even Carnot engine cannot give 100% efficiency because we cannot

(a) Prevent radiation            (b)  Find ideal sources (c)   Reach absolute zero temperature            (d)  Eliminate friction Answer-c (8)

22. Efficiency of a Carnot engine is 50% when temperature of outlet is 500 K. In order to increase efficiency up to 60% keeping temperature of intake the same what is temperature of outlet 

(a)  200 K                                         (b)  400 K (c)   600 K                       ...

21. A Carnot’s engine is made to work between 200°C and 0°C first and then between 0°C and –200°C. The ratio of efficiencies of the engine in the two cases is

(a) 1.73 : 1                                      (b)  1 : 1.73 (c)   1 : 1                 ...

20. A scientist says that the efficiency of his heat engine which operates at source temperature 127°C and sink temperature 27°C is 26%, then

(a) It is impossible                         (b)  It is possible but less probable (c)   It is quite probable (d)  Data are...

19. A carnot engine has the same efficiency between 800 K to 500 K and x K to 600 K. The value of x is

(a)  1000 K                                       (b)  960 K (c)   846 K                       ...

18. A measure of the degree of disorder of a system is known as

(a)  Isobaric                              (b)  Isotropy (c)   Enthalpy                            (d)  Entropy Answer-d (10)

17. A Carnot engine operates between 227°C and 27°C Efficiency of the engine will be

(a)  1/3                                     ...

16. The efficiency of Carnot’s engine operating between reservoirs, maintained at temperatures 27°C  and -123°C is

(a)      50%                                           (b)  24% (c)   0.75%                             ...

15. In a Carnot engine, when

T2=0°C  and T1=200°C  its efficiency is η1 and when T1=0°C  and T2=200°C , Its efficiency is η2 , then what is η1...

14. The temperature of reservoir of Carnot’s engine operating with an efficiency of 70% is 1000K. The temperature of its sink is

(a)   300 K                                         (b)  400 K (c)   500 K                       ...

12. A Carnot engine absorbs an amount Q of heat from a reservoir at an abosolute temperature T and rejects heat to a sink at a temperature of T/3. The amount of heat rejected is

(a)  Q / 4                                   (b)  Q / 3 (c)   Q / 2                                   (d)  2Q / 3 Answer-b (3)

14. Which of the following is a slow process

(a) Isothermal                          (b)  Adiabatic (c)   Isobaric                              (d)  None...

16. A Container having 1 mole of a gas at a temperature

27°C has a movable piston which maintains at constant pressure in container of 1 atm. The gas is compressed until...

10. Efficiency of Carnot engine is 100% if

(a) T2 =273K                      (b) T2 =0 K (c)  T1 =273K                      (d)   T1...

9. An ideal heat engine exhausting heat at 77°C is to have a 30% efficiency. It must take heat at

(a)  127°C                              (b) 227°C (c)    327°C                              (d) 673°C Answer-b (7)
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