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July 2022

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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 (8)

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 (11)

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 (16)

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 (10)

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   (6)

24. For adiabatic processes

(γ=Cp/Cv) (a)  PγV = constant               (b)TγV  = constant (c)  TVγ-1  =constant              (d) TVγ   = constant Answer-c (7)

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 (20)

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 (5)

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 (8)

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 (6)

9. Two identical samples of a gas are allowed to expand (i) isothermally (ii) adiabatically. Work done is

(a)  More in the isothermal process (b)  More in the adiabatic process (c)   Neither of them (d)  Equal in both...

7. The pressure and density of a diatomic gas (γ=7/5)  change adiabatically from (P, d) to (P’, d’). If (d’/d)=32 , then P’/P  should be

(a)  1/128                                (b)  32 (c)   128                                    (d)  None of the above Answer-c (8)

5.  A gas at NTP is suddenly compressed to one-fourth of its original volume.

If γ  is supposed to be (3/2) , then the final pressure is (a)  4 atmosphere                    (b)  3/2 atmosphere (c)  ...

4. The pressure in the tyre of a car is four times the atmospheric pressure

at 300 K. If this tyre suddenly bursts, its new temperature will be ( γ=1.4) (a)     300 (4)1.4/0.4   ...

3. In adiabatic expansion

(a)  ΔU = 0                             (b)  ΔU =...

2. The work done in an adiabatic change in a gas depends only on

(a) Change is pressure               (b) Change is volume (c) Change in temperature     ...

1. If a cylinder containing a gas at high pressure explodes, the gas undergoes

(a)  Reversible adiabatic change and fall of temperature (b)  Reversible adiabatic change and rise of temperature (c)   Irreversible adiabatic change...

31. During an isothermal expansion of an ideal gas

(a)  Its internal energy decreases (b)  Its internal energy does not change (c)   The work done by the gas is...

40. The volume of an ideal gas is 1 litre and its pressure is equal to 72cm of mercury column.

The volume of gas is made 900 cm3 by compressing it isothermally. The stress of the gas will be (a) ...

29. A cylinder fitted with a piston contains 0.2 moles of air at temperature

27°C. The piston is pushed so slowly that the air within the cylinder remains in thermal equilibrium with the surroundings....

28. One mole of an ideal gas expands at a constant temperature of 300 K from an initial volume of 10 litres to a final volume of 20 litres. The work done in expanding the gas is

(R = 8.31 J/mole–K) (a)  750 joules                                  (b)  1728 joules (c)   1500 joules               ...

27. 540 calories of heat convert 1 cubic centimeter of water at 100°C into 1671 cubic centimeter of steam at 100°C  at a pressure of one atmosphere. Then the work done against the atmospheric pressure is nearly

(a)  540 cal                               (b)  40 cal (c)   Zero cal                              (d)  500 cal Answer-b (6)

26. The latent heat of vaporisation of water is 2240 J/gm. If the work done in the process of expansion of 1 g is 168 J, then increase  in internal energy is 

(a)  2408 J                                (b)  2240 J (c)   2072 J                                (d)  1904 J Answer-c (9)

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