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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The molecules of a given mass of a gas have r.m.s. velocity of 200 m/s at 27o C and 1.0 x 105 Nm-2 pressure. When the temperature and pressure of the gas are respectively, 127o C and 0.05 x 105  Nm-2, the RMS velocity of its molecules in m/s is,

  • fraction numerator 400 over denominator square root of 3 end fraction
  • fraction numerator 100 square root of 2 over denominator 3 end fraction
  • 100 over 3
  • 100 over 3
2144 Views

2.

The mean free path of molecules of a gas, (radius r) is inversely proportional to,

  • r3

  • r2

  • r

  • r

969 Views

3.

In the given (V-T )diagram, what is the relation between pressures p1 and p2?

  • p2 =p1

  • p2>p1

  • p2<p1

  • p2<p1

982 Views

4.

Two vessels separately contain two ideal gases A and B the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be 1.5 times the density of B. The ratio of molecular weight of A and B is

  • 2/3

  • 3/4

  • 2

  • 2

1410 Views

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5.

In producing chlorine by electrolysis 100 kW power at 125 V is being consumed. How much chlorine per minute is liberated (ECE of chlorine is 0.367 x 10-6 KgC-1)

  • 1.76 x 10-3 kg

  • 9.67 x 10-3 kg

  • 17.61 x 10-3 kg

  • 17.61 x 10-3 kg

1162 Views

6.

An alpha nucleus of energy mv2/2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to 

  • 1/Ze

  • v2

  • 1/m

  • 1/v4


7.

The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by

  • σr2T4/R2

  • σr2T4/4πR2

  • σr4T4/r4

1009 Views

8.

A particle of mass M starting from rest undergoes uniform acceleration. If the speed acquired in time T is v, the power delivered to the particle is

  • Mv2/T

  • Mv2 / 2T2

  • Mv2/T2

  • Mv2/T2

948 Views

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9.

An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

  • mv3 /2

  • mv3

  • mv2/2

  • mv2/2

628 Views

10.

At 10o C the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At 110o C this ratio is

  • x

  • 383x/283

  • 10x/110

  • 10x/110

768 Views

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