JEE PHYSICS UNIT 09
QUIZ NO 1
TOTAL QUESTIONS = 20
1. The average kinetic energy of gas molecules is directly proportional to
A. Pressure
B. Temperature
C. Volume
D. Density
2. The root mean square velocity of gas molecules is proportional to
A. √T
B. 1/√T
C. T
D. T²
3. The ratio of specific heats Cp/Cv for a monoatomic gas is
A. 5/3
B. 7/5
C. 1.33
D. 1.4
4. According to kinetic theory, the pressure exerted by a gas is due to
A. Intermolecular attraction
B. Collision of gas molecules with container walls
C. Random motion of gas molecules
D. Temperature
5. If the temperature of an ideal gas is doubled, the average kinetic energy of its molecules
A. Remains the same
B. Becomes half
C. Doubles
D. Becomes four times
6. The mean free path of gas molecules is inversely proportional to
A. Number density of molecules
B. Volume
C. Pressure
D. Temperature
7. The internal energy of an ideal gas depends on
A. Pressure
B. Volume
C. Temperature
D. Number of moles and pressure
8. The degrees of freedom for a diatomic gas at room temperature is
A. 3
B. 5
C. 6
D. 7
9. The ratio of the root mean square speed to the average speed of gas molecules is approximately
A. 1
B. 1.086
C. 0.921
D. 1.5
10. The specific heat at constant volume for a monoatomic ideal gas is
A. 3R/2
B. 5R/2
C. R
D. 7R/2
11. The pressure of an ideal gas is proportional to
A. Number of molecules per unit volume
B. Square of the velocity of gas molecules
C. Mass of the gas
D. All of these
12. Which of the following is true for an ideal gas
A. Its molecules have finite volume
B. There are intermolecular forces
C. The collisions between molecules are elastic
D. Its internal energy depends on pressure
13. The molar specific heat at constant pressure for a monoatomic gas is
A. 3R/2
B. 5R/2
C. R
D. 7R/2
14. The average kinetic energy of a gas molecule at absolute temperature T is given by
A. 3/2 kT
B. 1/2 kT
C. kT
D. 2kT
15. If the pressure of an ideal gas is doubled at constant temperature, the mean free path of its molecules will
A. Remain the same
B. Double
C. Halve
D. Become zero
16. The total translational kinetic energy of 1 mole of an ideal gas at temperature T is
A. 3RT/2
B. 5RT/2
C. RT
D. 7RT/2
17. The equation PV = nRT is valid for
A. All gases under all conditions
B. Real gases under high pressure and low temperature
C. Ideal gases under all conditions
D. Ideal gases at low pressure and high temperature
18. The speed of sound in a gas is directly proportional to
A. √T
B. √P
C. 1/√T
D. 1/√P
19. The ratio of Cp to Cv for a diatomic gas at room temperature is
A. 1.67
B. 1.4
C. 1.33
D. 1.2
20. The internal energy of an ideal monoatomic gas is equal to
A. 3/2 PV
B. 3/2 nRT
C. 3/2 kT
D. All of these
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