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Shilpa

HomeAuthor: ShilpaPage 6

53. A vessel contains 1 mole of

O2  gas (molar mass 32) at a temperature T. The pressure of the gas is P. An identical vessel containing...

55. For ideal gas, which statement is not true

(a) It obeys Boyle’s law (b) It follows PV = RT (c) Internal energy depends on temperature only (d) It...

72. At a given volume and temperature, the pressure of a gas

(a) Varies inversely as its mass (b)   Varies inversely as the square of its mass (c)   Varies linearly as its...

71. Three containers of the same volume contain three different gases. The masses of the molecules are

m1,m2 and m3 and the number of molecules in their respective containers are N1,N2  and N3 . The gas pressure...

70. The pressure and temperature of two different gases is P and T having the volume V for each. They are mixed keeping the same volume and temperature, the pressure of the mixture will be

(a)   P / 2                                        (b)   P (c)   2P                                            (d)   4P Answer-c (8)

68. Oxygengas is filled in a vessel. If pressure is doubled, temperature becomes four times. How many times its density will become

(a)   2                                               (b)   4 (c)   1/4                             ...

69. The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

(a)  1092 K                                            (b)   273 K (c)   546°C                         ...

66. The equation of state corresponding to 8 g of

O2 is (a)   PV = 8RT                                         (b)   PV = RT/4 (c)   PV = RT             ...

65. A gas at 27°C has a volume V and pressure P. On heating its pressure is doubled and volume becomes three times. The resulting temperature of the gas will be

(a)   1800°C                                   (b)   162°C (c)   1527°C                                   (d)   600°C Answer-c (91)

64. In the relation n=(PV)/(RT),n=

(a) Number of molecules      (b)     Atomic number (c) Mass number                    (d)...

63. A balloon contains

1500 m3 of helium at 27°C  and 4 atmospheric pressure. The value of helium at -3°C  temperature and 2 atmospheric...

62. When volume of system is increased two times and temperature is decreased half of its initial temperature, then pressure becomes

(a) 2 times                         (b) 4 times (c) (1/4) times                  ...

61. A gas at

27°C temperature and 30 atmospheric pressure is allowed to expand to the atmospheric pressure. If the volume becomes 10 times...

60. The molecular weight of a gas is 44. The volume occupied by 2.2 g of this gas at 

0°Cand 2 atm pressure will be (a) 0.56 litre                   (b) 1.2 litres (c) 2.4 litres                   (d) 5.6 litres Answer-a...

59. A flask is filled with 13 gm of an ideal gas at

27°C and its temperature is raised to 52°C. The mass of the gas that has to be released to maintain...

58. One litre of Helium gas at a pressure 76 cm of Hg and temperature

27° is heated till its pressure and volume are doubled. The final temperature attained by the gas is (a) 927°C                       ...

57. Kinetic theory of gases was put forward by

(a) Einstein                    (b) Newton (c) Maxwell                    (d) Raman Answer-c (5)

56. A given mass of a gas is allowed to expand freely until its volume becomes double.

If Cb and Ca are the velocities of sound in this gas before and after expansion respectively, then Ca is...

54. 1 mole of gas occupies a volume of 100 ml at 50 mm pressure. What is the volume occupied by two moles of gas at 100 mm pressure and at same temperature

(a) 50 ml                              (b) 100 ml (c) 200 ml                       ...

67. The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be

(a)   PV=(5/32)RT                 (b)   PV=5RT (c)   PV=(5/2)RT                        (d)  PV=(5/16)RT (Where R is...

26. A gas at the temperature 250 K is contained in a closed vessel. If the gas is heated through 1K, then the percentage increase in its pressure will be

(a) 0.4%                        (b) 0.2% (c) 0.1%                         (d) 0.8% Answer-a (4)

52. A balloon contains

500m3 of helium at 27°C and 1 atmosphere pressure. The volume of the helium at – 3°C temperature and 0.5...

51. The product of the pressure and volume of an ideal gas is

(a) A constant (b) Approx. equal to the universal gas constant (c) Directly proportional to its temperature (d) Inversely proportional...

50. A sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T, the mass of each molecule is m. The expression for the density of gas is (k = Boltzmann’s constant)

(a) mkT                                (b) P/kT (c) P/kTV                           (d) Pm/kT...

49. If a given mass of gas occupies a volume of 10 cc at 1 atmospheric pressure and temperature of 100°C(373.15 K). What will be its volume at 4 atmospheric pressure; the temperature being the same

(a) 100 cc                             (b) 400 cc (c) 2.5 cc                       ...

48. We write the relation for Boyle’s law in the form PV = C when the temperature remains constant. In this relation, the magnitude of C depends upon

(a)  The nature of the gas used in the experiment (b) The magnitude of g in the laboratory (c) The...

47. The pressure P, volume V and temperature T of a gas in the jar A and the other gas in the jar B at pressure 2P, volume V/4 and temperature 2T, then the ratio of the number of molecules in the jar A and B will be

(a)    1 : 1                                (b) 1 : 2 (c) 2 : 1                 ...

46. The number of molecules in a gas at pressure

1.64×10-3 atmospheres and temperature 200 K having the volume 1 cc are (a) 6.02×1016                          (b) 2.63×1016 (c) 3.01×1019  ...

45. For one gram mol of a gas, the value of R in the equation PV = RT is nearly

(a) 2 cal/K                            (b) 10 cal/K (c) 0.2 cal/K                       ...

44. The volume of a gas at 21°C temperature and 768 mm pressure is 1 litre. If the density of the gas is 1.2 gm/litre at NTP, then its mass will be

(a)  4 gm                               (b) 4.21 gm (c) 1.13 gm                       ...

43. At NTP the mass of one litre of air is 1.293 gm. The value of specific gas constant will be

(a) 0.29 J/K-gm                    (b) 4.2 J/K–gm (c) 8.3 J/K-gm                       (d)...

42. That gas cannot be liquified

(a) Which obeys Vander Waal’s equation (b) Which obeys gas equation at every temperature and pressure (c) The molecules of...

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...

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