Which one of the following graphs represents the behaviour of an

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 Multiple Choice QuestionsMultiple Choice Questions

21.

The colour of the +ve column in a gas discharge tube depends on

  • the type of glass used to construct the tube

  • the gas in the tube

  • the applied voltage

  • the material of the cathode


22.

The rms speed of the molecules of a gas in a vessel is 400 ms. If half of the gas leaks out, at constant temperature, the rms speed of the remaining molecules will be

  • 800 ms-1

  • 4002 ms-1

  • 400 ms-1

  • 200 ms-1


23.

An electron tube was sealed off during manufacture at a pressure of 1.2 x 10-7 mm of mercury at 27°C. Its volume is 100 cm3. The number of molecules that remain in the tube is

  • 2 × 1016

  • 3 × 1015

  • 3.86 × 1011

  • 5 × 1011


24.

A constant volume gas thermometer works on

  • Archimede's principle

  • Pascal's law

  • Boyle's law

  • Charle's law


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25.

A sample of ideal monoatomic gas is taken round the cycle ABCA as shown in the figure. The work done during the cycle is

                 

  • 3 pV

  • zero

  • 9 pV

  • 6 pV


26.

Heavy water is

  • compound of deuterium and oxygen

  • water at 4°C

  • water, in which soap does not lather

  • compound of heavy oxygen and heavy hydrogen


27.

Absorption coefficient of an open window is

  • 1

  • 0.25

  • zero

  • 0.5


28.

Oxygen is 16 times heavier than hydrogen. Equal volumes of hydrogen and oxygen are mixed. The ratio of speed of sound in the mixture to that in hydrogen is

  • 8

  • 2/17

  • 1/8

  • 32/17


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29.

Specific rotation of sugar solution is 0.01 SI units. 200 kgm-3 of impure sugar solution is taken in a polarimeter tube of length 0.25 m and an optical rotation of 0.4 rad is observed. The percentage of purity of sugar in the sample is

  • 11 %

  • 20 %

  • 80 %

  • 89 %


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30.

Which one of the following graphs represents the behaviour of an ideal gas ?


D.

For an ideal gas keeping the temperature same throughout,

         PV = constant

Hence, for a given mass, the graph between PV and V will be a straight line parallel to V-axis whatever may be the volume.


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