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Physics

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6. In thermal equilibrium, the average velocity of gas molecules is

(a) Proportional to √T                 (b)  Proportional to T2 (c)   Proportional to T3   ...

4. At a pressure of

24×105 dyne/cm2 , the volume of O2 is 10 litre and mass is 20 gm. The m.s. velocity will be...

2. To what temperature should the hydrogen at 327°C be cooled at constant pressure, so that the root mean square velocity of its molecules become half of its previous value

(a)  – 123°C                                     (b)  123°C (c)   – 100°C                         ...

100. Figure shows two flasks connected to each other. The volume of the flask 1 is twice that of flask 2. The system is filled with an ideal gas at temperature 100 K and 200 K respectively. If the mass of the gas in 1 be m then what is the mass of the gas in flask 2

(a) m (b) m/2 (c)  m/4 (d) m/8 Answer-c (15)

99. At constant pressure, the ratio of increase in volume of an ideal gas per degree raise in kelvin temperature to it’s original volume is (T = absolute temperature of the gas)

(a)  T2                                     ...

98. Equation of gas in terms of pressure (P), absolute temperature (T) and density (d) is

(a) P1/(T1d1)=P2/(T2d2)                               (b) (P1T1)/d1=(P2T2)/d2 (c)  (P1d2)/T1=(P2d1)/T2 ...

97. In Boyle’s law what remains constant

(a)  PV                                     ...

96. If the volume of the gas containing n number of molecules is V, then the pressure will decrease due to force of intermolecular attraction in the proportion

(a) n/v                                     ...

95. A tyre kept outside in sunlight bursts off after sometime because of

(a) Increase in pressure                (b)  Increases in volume (c)   Both (a) and (b)             ...

94. The value of PV/T for one mole of an ideal gas is nearly equal to

(a)      2 J mol–1K–1                                (b)  8.3 cal mol–1K–1 (c)   4.2 J mol–1K–1                 ...

93. What is the mass of 2 litres of nitrogen at 22.4 atmospheric pressure and 273K

(a)   28g                                     (b) ...

92. The temperature of an ideal gas at atmospheric pressure is

300K and volume 1m3. If temperature and volume become double, then pressure will be (a) 105 N/m2       ...

91. If an ideal gas has volume V at 27°C and it is heated at a constant pressure so that its volume becomes 1.5V. Then the value of final temperature will be

(a)  600°C                                 (b)  177°C (c)   817°C                                (d)  None of these Answer-b (11)

90. At what temperature volume of an ideal gas at 0°C becomes triple

(a)  546°C                                 (b)  182°C (c)   819°C                                (d)  646°C Answer-a   (11)

82. 2 gm of

O2 gas is taken at 27°C and pressure 76 cm. Of Hg. Then find out volume of gas (in litre)...

79. In Vander Waal’s equation a and b represent

[P+(a/V2)][v-b]=RT (a) Both a and b represent correction in volume (b)  Both a and b represent adhesive force between molecules...

77. For matter to exist simultaneously in gas and liquid phases

(a)  The temperature must be 0 K (b)  The temperature must be less than 0°C (c)   The temperature must be...

76. Two thermally insulated vessels 1 and 2 are filled with air at temperatures

( T1,T2) volume (V1,V2)  and pressure (P1,P2) respectively. If the valve joining the two vessels is opened, the temperature inside...

75. When a gas in a closed vessel was heated so as to increase its temperature by

5°C , there occurred an increase of 1% in its pressure. The original temperature of the gas was (a)   500...

74. A vessel is filled with an ideal gas at a pressure of 10 atmospheres and temperature

27°C. Half of the mass of the gas is removed from the vessel and temperature of the remaining gas is...

73. The rate of diffusion is

(a) Faster in solids than in liquids and gases (b)   Faster in liquids than in solids and gases (c)   Equal...

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                       ...

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