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47. A gas is suddenly compressed to 1/4 th of its original volume at normal temperature. The increase in its temperature is(γ=1.5)

(a)  273 K                                 (b)  573 K (c)   373 K                                 (d)  473 K Answer-a

46. One mole of an ideal gas at an initial temperature of T K does 6 R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be

(a) (T+2.4)K                        (b) (T-2.4)K (c)  (T+4)K        ...

45. In adiabatic expansion of a gas

(a)  Its pressure increases (b)  Its temperature falls (c)   Its density increases (d)  Its thermal energy increases Answer-b  

44.During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio

Cp/Cv for the gas is (a)   3/2                           ...

43. In an adiabatic process, the state of a gas is changed from

(P1,V1,T1) to (P2,V2,T2) . Which of the following relation is correct (a) T1V1γ-1=T2V2γ-1               (b)...

42. If γ=2.5 and volume is equal to 1/8  times to the initial volume then pressure P’ is equal to (Initial pressure = P)

(a) P‘=P                                (b) P‘=2P (c)...

41. Air is filled in a motor tube at 27°C and at a pressure of  atmospheres. The tube suddenly bursts, then temperature of air is( given γ of air=1.5) 

  (a) 27.5°C                             (b) 75°K (c)  150K ...

40. An ideal gas at a pressures of 1 atmosphere and temperature of 27°C is compressed adiabatically until its pressure becomes 8 times the initial pressure, then the final temperature is (γ = 3/2) 

(a) 627°C                               (b) 527°C (c) 427°C ...

39. ΔU + ΔW =0 is valid for

  (a)  Adiabatic process             (b)  Isothermal process (c)   Isobaric process                (d)  Isochoric process Answer-a

38. At 27°C  a gas is suddenly compressed such that its pressure becomes 1/8 th of original pressure. Temperature of the gas will be(γ=5/3) 

(a)  420K                                   (b) 327°C...

37. Two moles of an ideal monoatomic gas at 27°C occupies a volume of V. If the gas is expanded adiabatically to the volume 2V then the work done by the gas will be (γ=5/3,R=8.31J/mol K)                

(a) -2767.23 J                       (b) 2767.23 J (c)  2500J     ...

36. The process in which no heat enters or leaves the system is termed as

(a)  Isochoric                            (b)  Isobaric (c)   Isothermal                         (d)  Adiabatic Answer-(d)          In adiabatic process, no transfer of heat takes place between system...

35. A gas is being compressed adiabatically. The specific heat of the gas during compression is

(a)  Zero                                    (b)  Infinite (c)   Finite but non-zero           (d)  Undefined Answer-a

34. A diatomic gas initially at 18°C is compressed adiabatically to one-eighth of its original volume. The temperature after compression will be

(a) 10°C                                  (b) 887°C...

33. For adiabatic process, wrong statement is

(a)  dQ=0                                    (b)...

32. At N.T.P. one mole of diatomic gas is compressed adiabatically to half of its volume . The work done on gas will be

(a)  1280 J                                (b)  1610 J (c)   1815 J                                (d)  2025 J Answer-c

13. The amount of work done in an adiabatic expansion from temperature

T to T1 is (a) R(T-T1)                             ...

12. Pressure-temperature relationship for an ideal gas undergoing adiabatic

change is ( γ=Cp/Cv ) (a) PTγ  constant                  (b) PT-1+γ   constant (c)...

11. The slopes of isothermal and adiabatic curves are related as

(a)  Isothermal curve slope = adiabatic curve slope (b)  Isothermal curve slope =γ×  adiabatic curve slope (c)   Adiabatic curve slope...

31. One mole of helium is adiabatically expanded from its initial state

(Pi,Vi,Ti) to its final state (Pf,Vf,Tf) . The decrease in the internal energy associated with this expansion is equal to...

30. A cycle tyre bursts suddenly. This represents an

(a)  Isothermal process           (b)  Isobaric process (c)   Isochoric process              (d)  Adiabatic process Ans. d

29. Helium at

270 has a volume of 8 litres.It is suddenly compressed to a volume of 1 litre. The temperature of the...

28. In an adiabatic expansion of a gas initial and final temperatures

are T1 and T2 respectively, then the change in internal energy of the gas is (a)    (R/ϒ-1) (T2-T1)   ...

27. During the adiabatic expansion of 2 moles of a gas, the internal energy was found to have decreased by 100 J. The work done by the gas in this process is

(a)  Zero                                    (b)  –100 J (c)   200 J                                  (d)  100 J Ans. d

26. A given system undergoes a change in which the work done by the system equals the decrease in its internal energy. The system must have undergone an

(a)  Isothermal change           (b)  Adiabatic change (c)   Isobaric change                (d)  Isochoric change Answer-b

25. An ideal gas is expanded adiabatically at an initial temperature of 300 K so that its volume is doubled. The final temperature of the hydrogen gas is(γ=1.40)

(a)  227.36 K                            (b)  500.30 K (c)   454.76 K                            (d) -47°C Answer-a  

24. For adiabatic processes

(γ=Cp/Cv) (a)  PγV = constant               (b)TγV  = constant (c)  TVγ-1  =constant              (d) TVγ   = constant Answer-c

23. A polyatomic gas (γ=4/3)  is compressed to 1/8  of its volume adiabatically. If its initial pressure is

P0 , its new pressure will be (a) 8P0            (b) 16P0 (c) 6P0     ...

21. The adiabatic Bulk modulus of a perfect gas at pressure is given by

(a)  P                                         (b) 2P (c)  P/2                             ...

20. Compressed air in the tube of a wheel of a cycle at normal temperature suddenly starts coming out from a puncture. The air inside

(a) Starts becoming hotter (b) Remains at the same temperature (c) Starts becoming cooler (d) May become hotter or cooler...

19. One gm mol of a diatomic gas (γ=1.4) is compressed adiabatically so that its temperature rises from 27°C to 127°C . The work done will be

(a)  2077.5 joules                    (b)  207.5 joules (c)   207.5 ergs                         (d)  None of the above Answer-a

18. When a gas expands adiabatically

(a)  No energy is required for expansion (b)  Energy is required and it comes from the wall of the container...

17. Air in a cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time

(a)  The pressure decreases (b)  The pressure increases (c)   The pressure remains the same (d)  The pressure may increase or...

16. If γ denotes the ratio of two specific heats of a gas, the ratio of slopes of adiabatic and isothermal PV curves at their  point of intersection is

(a)  1/γ                                   (b) γ...

15. The adiabatic elasticity of hydrogen gas (γ=1.4) at NTP is

(a)  1×105 N/m2                  (b) 1×10-8 N/m2 (c) 1.4 N/m2      ...

14. During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2 joules, the work done during the process on the gas will be equal to

(a)  1 J                                       (b)   -1  J (c)   2 J                                       (d)  – 2 J Answer-d

6. A monoatomic gas (γ=5/3) is suddenly compressed to 1/8  of its original volume adiabatically, then the pressure of the gas will change to 

(a) 24/5 (b)  8 (c)  40/3 (d)  32 times its initial pressure Answer-d

23. When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be

1.5×104 J . During this process about (a) 3.6×103  cal  of heat flowed out from the gas (b) 3.6×103   cal...

10. Which is the correct statement

(a)  For an isothermal change PV = constant (b)  In an isothermal process the change in internal energy must be...

8. An ideal gas at 27°C is compressed adiabatically to 8/27 of its original volume.  If γ=5/3 ,  then the rise in temperature is

(a)  450 K                                 (b)  375 K (c)   225 K                                 (d)  405 K Answer-b

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