WorksheetsChapter 9 : KINETIC THEORY OF GASES
Total questions: 10
Worksheet time: 13mins
Oxygen molecules at temperature T have the same r.m.s. speed as helium molecules at 300 K. What is the temperature T ?
106 K
600 K
850 K
2400 K
The volume of an ideal gas is V when its pressure is p. The r.m.s. speed of the gas molecules is proportional to
pV
p/V
√pV
√p/V
The pressure of an ideal gas in a vessel is 1.5×105 Pa when the temperature is 350 K. What is the number of gas molecules per unit volume?
1.7×1020 m-3
1.4×1021 m-3
1.2×1022 m-3
3.1×1025 m-3
The pressure of an ideal gas in a vessel is p. The gas is heated at constant volume until the r.m.s. speed of the gas molecules is doubled. what is the new pressure of the gas?
√2p
2p
3p
4p
Which of the following is not an assumption of the kinetic theory of gases?
Gas molecules move with the same speed, known as the r.m.s. speed
Gas molecules are in constant free random motion
Collisions between gas molecules are perfectly elastic
The size of a gas molecule is negligible compared to the distance between gas molecules
Which statement about the internal energy U of a fixed mass of an ideal gas of pressure p, volume V and temperature T is correct?
U ∝ p
U ∝ pV
U ∝ V
U ∝ √T
The molecular speed distribution of a gas is shown in the figure above. Which of the statements is correct?
The mean speed is V'
The r.m.s. speed is greater than V'
The maximum number of molecules is n'
More than half of the number of molecules have speeds less than V'
When the pressure if air in a balloon is increased by 2% by pumping air into the balloon, it is found that the number of moles of air in the balloon has increased by 5%, the thermodynamic temperature increased by 2%. By What percentage has the volume of the balloon changed?
Decreased by 3%
Decreased by 5%
Increased by 5%
Increased by 7%
The root-mean square speed of the molecules of a gas in a closed container is v. If the gas is heated at constant volume until the pressure is doubled, what is the r.m.s. speed now?
1/2 v
1/√2 v
√2 v
2 v
The pressure of an ideal gas in a closed container is p, and the mean kinetic energy of the molecules is E. If the mean kinetic energy increase to 9E, what is the pressure of the gas?
3p
9p
27p
81p
