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1. The pressure exerted by a gas is due to

A. Intermolecular attraction B. Collisions of gas molecules with container walls C. Elastic collisions between molecules D. Volume of the gas

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2. The root mean square velocity of gas molecules is proportional to

A. T B. √T C. 1/T D. 1/√T

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3. The average kinetic energy of a molecule of a gas is proportional to

A. Temperature B. Pressure C. Volume D. Density

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4. The internal energy of an ideal gas depends on

A. Pressure only B. Volume only C. Temperature only D. Both pressure and volume

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5. The ratio Cp/Cv for a monoatomic gas is

A. 5/3 B. 7/5 C. 1.33 D. 1.4

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6. The total translational kinetic energy of one mole of a gas is given by

A. 3/2 RT B. RT C. 5/2 RT D. 7/2 RT

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7. The mean free path of gas molecules increases with

A. Increase in pressure B. Decrease in temperature C. Increase in volume D. Decrease in number density of molecules

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8. The molar specific heat at constant volume for a monoatomic gas is

A. 3R/2 B. 5R/2 C. 7R/2 D. R

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9. For a diatomic gas, the degrees of freedom are

A. 3 B. 5 C. 6 D. 7

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10. The kinetic energy per unit volume of an ideal gas is given by

A. 3/2 P B. 5/2 P C. nRT D. nCvT

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11. If the temperature of an ideal gas is doubled, the root mean square speed of its molecules becomes

A. Double B. √2 times C. Half D. Four times

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12. The pressure of an ideal gas is directly proportional to

A. Number density of molecules B. Temperature C. Velocity of molecules D. Both number density and temperature

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13. The internal energy of one mole of a diatomic gas at temperature T is

A. 3/2 RT B. 5/2 RT C. 7/2 RT D. RT

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14. The temperature at which the root mean square velocity of nitrogen molecules equals that of oxygen molecules at 300 K is

A. 300 K B. 600 K C. 1200 K D. 3000 K

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15. The specific heat of a gas in an isothermal process is

A. Zero B. Infinity C. Equal to Cv D. Equal to Cp

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16. The average speed of gas molecules at temperature T is proportional to

A. 1/T B. √T C. T D. T²

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17. The ideal gas equation PV = nRT is valid for

A. All gases under all conditions B. Ideal gases under all conditions C. Ideal gases at low pressure and high temperature D. Real gases under all conditions

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18. The total energy of an ideal gas is due to

A. Translational motion only B. Rotational motion only C. Vibrational motion only D. All forms of motion

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19. The ratio of Cp to Cv for a triatomic linear gas is

A. 1.67 B. 1.33 C. 1.4 D. 1.29

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20. The mean free path of gas molecules is inversely proportional to

A. Pressure B. Volume C. Temperature D. Number density of molecules