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Shilpa

HomeAuthor: ShilpaPage 5

13. A sample of gas is at 0°C. To what temperature it must be raised in order to double the r.m.s. speed of the molecule

(a)  270°C                                        (b)  819°C (c)   1090°C                             ...

12. The root mean square velocity of a gas molecule of mass m at a given temperature is proportional to

(a) m0                                     (b) ...

83. An electron tube was sealed off during manufacture at a pressure of

1.2×10-7 mm of mercury at 27°C. Its volume is 100 cm3. The number of molecules that remain in the tube...

5. The r.m.s. velocity will be greater for

(a) Hydrogen                                  (b)  Oxygen (c)   Equal for both                       ...

3. At a certain temperature, the m.s. velocity for

O2 is 400 m/sec. At the same temperature, the r.m.s. velocity for H2 molecules will be (a)  100 m/sec                                 (b) ...

1. If the molecular weight of two gases are M1 and M1, then at a temperature the ratio of root mean square velocity v1 and v2 will be

(a) √M1/M2                                     ...

89. Air is pumped into an automobile tube upto a pressure of 200 kPa in the morning when the air temperature is 22°C. During the day, temperature rises to 42°C and the tube expands by 2%. The pressure of the air in the tube at this temperature, will be approximately

(a)  212 kPa                              (b)  209 kPa (c)   206 kPa                             (d)  200 kPa Answer-b (6)

88. Saturated vapour is compressed to half its volume without any change in temperature, then the pressure will be

(a)  Doubled                             (b)  Halved (c)   The same                           (d)  Zero Answer-c (8)

87. 125 ml of gas A at 0.60 atmosphere and 150 ml of gas B at 0.80 atmosphere pressure at same temperature is filled in a vessel of 1 litre volume. What will be the total pressure of mixture at the same temperature

(a)  0.140 atmosphere            (b)  0.120 atmosphere (c)  0.195 atmosphere            (d) 0.212 atmosphere Answer-c (98)

86. A gas is collected over the water at 25°C. The total pressure of moist gas was 735 mm of mercury. If the aqueous vapour pressure at 25°C is 23.8 mm. Then the pressure of dry gas is

(a)  760 mm                                     (b)  758.8 mm (c)  710.8 mm                     ...

84. If the pressure of an ideal gas contained in a closed vessel is increased by 0.5%, the increase in temperature is 2K. The initial temperature of the gas is

(a)  27°C                                          (b)  127°C (c)   300°C                                (d)  400°C Answer-b (12)

81. At 0°C the density of a fixed mass of a gas divided by pressure is x. At 100°C, the ratio will be

(a)  x                                     ...

The gas in vessel is subjected to a pressure of 20 atmosphere at a temperature 27°C. The pressure of the gas in a vessel after one half of the gas is released from the vessel and the temperature of the remainder is raised by 50°C is

(a)  8.5 atm                               (b)  10.8 atm (c)   11.7 atm                            (d) 17 atm Answer-c (8)

78. The value of critical temperature in terms of Vander Waal’s constant a and b is

(a)   Tc =(8a)/27Rb                        (b)  Tc =(a)/2Rb (c)   Tc =(8)/27Rb   ...

11. For a gas, the r.m.s. speed at 800 K is

(a)  Four times the value at 200 K (b)  Half the value at 200 K (c)   Twice the value at...

10. At what temperature is the root mean square velocity of gaseous hydrogen molecules is equal to that of oxygen molecules at 47°C

(a)  20 K                                           (b)  80 K (c)   – 73 K                     ...

9. The root mean square velocity of the molecules in a sample of helium is 5/7th that of the molecules in a sample of hydrogen. If the temperature of hydrogen sample is 0°C, then the temperature of the helium sample is about

(a) 0°C                                     (b)...

8. The absolute temperature of a gas is determined by

(a) The average momentum of the molecules (b)  The velocity of sound in the gas (c)   The number of molecules...

7. At what temperature will the oxygen molecules have the same root mean square speed as hydrogen molecules at 200 K

(a) 800 K                                         (b)  1600 K (c)   2400 K                       ...

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...

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