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July 2022

Home2022JulyPage 13

41. The gas equation (PV)/T constant is true for a constant mass of an ideal gas undergoing

(a) Isothermal change          (b) Adiabatic change (c) Isobaric change              (d) Any type of change...

39. At 100 K and 0.1 atmospheric pressure, the volume of helium gas is 10 litres. If volume and pressure are doubled, its temperature will change to

(a) 400 K                             (b) 127 K (c) 200 K                       ...

36. When the pressure on 1200 ml of a gas in increased from 70 cm to 120 cm of mercury at constant temperature, the new volume of the gas will be

(a)    700 ml                            (b) 600 ml (c) 500 ml                       ...

34. At constant temperature on increasing the pressure of a gas by 5% will decrease its volume by

(a) 5%                            (b) 5.26% (c) 4.26%                       (d) 4.76% Answer-d (3)

33. Hydrogen gas is filled in a balloon at 20°C. If temperature is made 40°C , pressure remaining same, what fraction of Hydrogen will come out

(a) 0.07                          (b) 0.25 (c) 0.5                            (d) 0.75 Answer-a   (8)

19. If pressure of a gas contained in a closed vessel is increased by 0.4% when heated by 1°C, the initial temperature must be

(a) 250 K                              (b) 250°C (c) 2500 K                         ...

20. Consider a 1 c.c. sample of air at absolute temperature

T0 at sea level and another 1 cc sample of air at a height where the pressure is one-third atmosphere....

22. Which of the following statements about kinetic theory of gases is wrong

(a) The molecules of a gas are in continuous random motion (b) The molecules continuously undergo inelastic collisions (c) The...

40. Under which of the following conditions is the law PV = RT obeyed most closely by a real gas

(a) High pressure and high temperature (b) Low pressure and low temperature (c) Low pressure and high temperature (d) High...

38. The molecular weights of

O2 and N2 are 32 and 28 respectively. At 15°C, the pressure of 1 gm O2 will be the same...

37. The equation for an ideal gas is PV = RT, where V represents the volume of

(a) 1 gm gas                         (b) Any mass of the gas (c) One gm mol gas           ...

35. Which law states that effect of pressure is same for all portion

(a) Pascal’s law              (b) Gallusac’s law (c) Dalton’s law              (d) None of these Answer-a   (12)

32. A perfect gas at 27°C  is heated at constant pressure to 327°C. If original volume of gas (at 27°C is V then volume at 327°C is

(a) V                               (b) 3 V (c) 2 V                            (d) V / 2 Answer-c (9)

31.

On 0°C pressure measured by barometer is 760 mm. What will be pressure on 100°C (a) 760 mm                    (b) 730...

21. To double the volume of a given mass of an ideal gas at 27°C keeping the pressure constant, one must raise the temperature in degree centigrade to

(a)  54°                                    (b)...

23. If a Vander-Waal’s gas expands freely, then final temperature is

(a) Less than the initial temperature (b) Equal to the initial temperature (c) More than the initial temperature (d)  Less...

24. In Vander Waal’s equation

[P+(a/V2)](V-b)=RT,  the dimensions of a are (a) M1L5 T-2                       ...

25. At NTP, sample of equal volume of chlorine and oxygen is taken. Now ratio of No. of molecules

(a) 1 : 1                          (b) 32 : 27 (c) 2 : 1                          (d) 16 : 14 Answer-a (8)

27. A cylinder of 5 litre capacity, filled with air at N.T.P. is connected with another evacuated cylinder of 30 litres of capacity. The resultant air pressure in both the cylinders will be

(a) 38.85 cm of Hg       (b) 21.85 cm of  Hg (c) 10.85 cm of Hg        (d) 14.85 cm of  Hg...

28. Volume of gas become four times if

(a) Temperature become four times at constant pressure (b) Temperature become one fourth at constant pressure (c) Temperature becomes two...

29. The relationship between pressure and the density of a gas expressed by Boyle’s law, P = KD holds true

(a) For any gas under any conditions (b) For some gases under any conditions (c) Only if the temperature is...

18. For Boyle’s law to hold the gas should be

(a) Perfect and of constant mass and temperature (b) Real and of constant mass and temperature (c) Perfect and at...

30. Kinetic theory of gases provide a base for

(a) Charle’s law (b) Boyle’s law (c) Charle’s law and Boyle’s law (d)  None of these Answer-c (7)

17. The mean free path of gas molecules depends on (d = molecular diameter)

(a) d                        (b)  d2 (c)  d-2       ...

16. When air is filled in the balloon, the pressure and volume both increases while temperature does not change. Here Boyle’s law is not obeyed because

(a) Mass of air is negligible (b) Mass of air does not remain constant (c) Air is not perfect gas...

15. It is possible for a substance to coexist in all three phases in equilibrium, when the substance is at

(a) Boyle temperature          (b) Critical temperature (c) Triple point                       (d)...

13. The vapour of a substance behaves as a gas

(a) Below critical temperature   (b) Above critical temperature (c) At 100°C                   ...

14. The temperature below which a gas should be cooled, before it can be liquified by pressure only is termed as

(a)    The dew point                (b) The freezing point (c) The saturation point         (d) The critical point...

12. The gas which obeys Boyle’s law for maximum range of temperature is

(a)  CO2                                     ...

11. At absolute zero temperature, pressure of a gas will be

(a)  Zero                                                 (b)   One atmospheric pressure (c) P0 × 273                     ...

10. Two gases of equal mass are in thermal equilibrium.

If Pa,Pb and Va and Vb are their respective pressures and volumes, then which relation is true (a) Pa ≠Pb  ; ...

9. The volume of a gas at 20°C is 200 ml. If the temperature is reduced to – 20°C at constant pressure, its volume will be

(a)  172.6 ml                                         (b)   17.26 ml (c)   192.7 ml                       ...

8. The density of a gas at normal pressure and 27°C temperature is 24. Keeping the pressure constant, the density at 127°C will be

(a)  6                                     ...

1. The temperature of a gas at pressure P and volume V is 27°C. Keeping its volume constant if its temperature is raised to 927°C, then its pressure will be

(a)   2 P                                   ...

2. 4 moles of an ideal gas is at 0°C. At constant pressure it is heated to double its volume, then its final temperature will be

(a)   0°C                                     ...

3. Every gas (real gas) behaves as an ideal gas

(a)   At high temperature and low pressure (b)   At low temperature and high pressure (c)   At normal temperature and pressure...

4. Boyle’s law holds for an ideal gas during

(a)  Isobaric changes                          (b)   Isothermal changes (c)   Isochoric changes                       (d)  ...

5. S.I. unit of universal gas constant is

(a)  cal/°C                                              (b)   J/mol (c)   J/mol/K                             ...

6. Molecules of a gas behave like

(a)  Inelastic rigid sphere (b)   Perfectly elastic non-rigid sphere (c)   Perfectly elastic rigid sphere (d)   Inelastic non-rigid sphere Answer-c (45)

7. A perfect gas at 27°C is heated at constant pressure so as to triple its volume. The temperature of the gas will be

(a)  81°C                                                 (b)   900°C (c)   627°C                             ...

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