The mass of a hydrogen molecule is 3.32 x 10-27 kg. If 1023 hydro

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Cp and Cv are specific heats at constant pressure and constant volume respectively. It is observed that
Cp – Cv = a for hydrogen gas
Cp – Cv = b for nitrogen gas
The correct relationship between a and b is

  • a = 14 b

  • a = 28 b

  • a = 1/14b

  • a = 1/14b

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2.

The speed of sound in oxygen (O2) at a certain temperature is 460 ms−1. The speed of sound in helium (He) at the same temperature will be (assumed both gases to be ideal)

  • 1420 ms−1

  • 550 ms−1

  • 375 ms−1

  • 375 ms−1

886 Views

3.

A charged particle moves through a magnetic field perpendicular to its direction. Then

  • the momentum changes but the kinetic energy is constant

  • both momentum and kinetic energy of the particle are not constant

  • both, momentum and kinetic energy of the particle are constant

  • both, momentum and kinetic energy of the particle are constant

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4.

A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio cp/cv of the mixture is

  • 1.59

  • 1.62

  • 1.4

  • 1.4

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5.

One mole of ideal monoatomic gas (γ = 5/30) is mixed with one mole of diatomic gas(γ = 7/5). What is γ for the mixture? γ denotes the ratio of specific heat at constant pressure, to that at constant volume.

  • 3/2

  • 23/15

  • 35/23

  • 35/23

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6.

The mass of a hydrogen molecule is 3.32 x 10-27 kg. If 1023 hydrogen molecules strike, per second, a fixed wall of area 2cm2 at an angle of 45° to the normal, and rebound elastically with a speed of 103 m/s, then the pressure on the wall is nearly:

  • 4.70 x 102 N/m2

  • 2.35 x 103 N /m2

  • 4.70 x 103 N/m2

  • 2.35 x 102 N /m2


B.

2.35 x 103 N /m2

Change in momentum


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7.

A particle is moving in a circular path of radius a under the action of an attractive potential U = -k/2r2. its total energy is:

  • -32ka2

  • -k4a2

  • k2a2

  • zero


8.

For an ideal gas, the specific heat at constant pressure Cp is greater than the specific heat at constant volume Cv. This is because

  • There is a finite work done by the gas on its environment when its temperature is increased while the pressure remains constant

  • There is a finite work done by the gas on its environment when its pressure is increased while the volume remains constant

  • There is a finite work done by the gas on its environment when its pressure is increased while the temperature remains constant

  • The pressure of the gas remains constant when its temperature remains constant


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9.

The difference between the specific heats of a gas is 4150 Jkg-1 K-1. If the ratio of specific heat is 1.4, then the specific heat at constant volume of the gas (in J kg-1 K-1) is

  • 1037.5

  • 2037.5

  • 8300

  • 10375


10.

For a monoatomic gas, the molar specific heat at constant pressure divided by the molar gas constant R is equal to

  • 2.5

  • 1.5

  • 5.0

  • 3.5


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