NEET Free Online Mock Test - 2019

NEET Physics  Kinetic Theory of Gases  Practice Q & A

1. One mole of mono atomic gas (γ = 5/3) is mixed with one mole of diatomic gas (γ = 7/5) what will be the value of γ for the mixture?

1.5 2.5 1.0 2

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2. The r.m.s velocity of the molecules of an ideal gas is C at a temperature of 100 K. at what temperature is r.m.s. velocity will be doubled?

200 K 400 K 300 K 50 K

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3. The r.m.s. speed of the molecules of an enclosed gas is $x$. what will be the r.m.s. speed, if the pressure of the gas is doubled but the temperature is kept constant?

$x$ $\dfrac{x}{2}$ 2$x$ $\sqrt{x}$

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4. The r.m.s. velocity of the molecules in the sample of helium is 5/7th that of the molecules in the sample of hydrogen. If the temperature of the hydrogen sample is 0°C that of helium is

0°C 0 K 273°C 100°C

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5. K.E. per unit volume is given by

E = $\dfrac{3}{2}P$ E = $\dfrac{2}{3}P$ E = $\dfrac{1}{2}mv^2$ None of these

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6. A gas is taken in a sealed container at 300 K. it is heated at constant volume to a temperature 600 K. the mean K.E. of its molecules is

Halved Doubled Tripled Quadrupled

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7. If for a gas $\left(\dfrac{R}{C_V}\right)$ = 0.67 this gas is made up of molecules which are

Diatomic Mixture of diatomic and polyatomic Mono atomic Polyatomic

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8. R.m.s. velocity of a gas molecule of mass m at given temperature is proportional to

m0 m $\sqrt{m}$ $\dfrac{1}{\sqrt{m}}$

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9. The specific heat of a substance at its boiling point or melting point

Is zero Is infinity Is negative Lies between 0 and 1

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10. A wall is hit elastically and normally by n balls per second, all the balls have the same mass m and are moving with the same velocity u. the force exerted by the balls on the wall is

mnu2 2 mnu2 2 mnu $\dfrac{1}{2}$ mnu2

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