JEE-MAIN SERIES Physics
Kinetic Molecular Theory Of Gases
9 previous year questions.
Volume: 9 Ques
Yield: Medium
High-Yield Trend
5
2023 3
2022 1
2019 Chapter Questions 9 MCQs
01
PYQ 2019
easy
physics ID: jee-main
The number density of molecules of a gas depends on their distance r from the origin as, Then the total number of molecules is proportional to :
1
2
3
4
02
PYQ 2022
easy
physics ID: jee-main
Which statements are correct about degrees of freedom?
(A) A molecule with n degrees of freedom has n2 different ways of storing energy.
(B) Each degree of freedom is associated with (1/2)RT average energy per mole.
(C) A monatomic gas molecule has 1 rotational degree of freedom whereas diatomic molecule has 2 rotational degrees of freedom.
(D) CH4 has a total of 6 degrees of freedom.
Choose the correct answer from the option given below:
1
(B) and (C) only
2
(B) and (D) only
3
(A) and (B) only
4
(C) and (D) only
03
PYQ 2022
medium
physics ID: jee-main
What will be the effect on the root mean square velocity of oxygen molecules if the temperature is doubled and oxygen molecule dissociates into atomic oxygen?
1
The velocity of atomic oxygen remains same
2
The velocity of atomic oxygen doubles
3
The velocity of atomic oxygen becomes half
4
The velocity of atomic oxygen becomes four times
04
PYQ 2022
medium
physics ID: jee-main
What will be the effect on the root mean square velocity of oxygen molecules if the temperature is doubled and oxygen molecule dissociates into atomic oxygen?
1
The velocity of atomic oxygen remains same
2
The velocity of atomic oxygen doubles
3
The velocity of atomic oxygen becomes half
4
The velocity of atomic oxygen becomes four times
05
PYQ 2023
easy
physics ID: jee-main
The ratio of speed of sound in hydrogen gas to the speed of sound in oxygen gas at the same temperature is:
1
4 : 1
2
1 : 2
3
1 : 1
4
1 : 4
06
PYQ 2023
medium
physics ID: jee-main
The mean free path of molecules of a certain gas at STP is 1500d, where d is the diameter of the gas molecules. While maintaining the standard pressure, the mean free path of the molecules at 373K is approximately
1
1500d
2
750d
3
2049d
4
1098d
07
PYQ 2023
easy
physics ID: jee-main
The number of air molecules per cm3 increased from 3 × 1019 to 12 × 1019. The ratio of collision frequency of air molecules before and after the increase in the number respectively is :
1
0.25
2
0.75
3
1.25
4
0.50
08
PYQ 2023
medium
physics ID: jee-main
The root mean square speed of molecules of nitrogen gas at 27°C is approximately : (Given mass of a nitrogen molecule = kg and take Boltzmann constant KB = JK–1 )
1
1260 m/s
2
91 m/s
3
27.4 m/s
4
523 m/s
09
PYQ 2023
medium
physics ID: jee-main
At the rms speed of oxygen molecules is times to that of its average speed in the gas. Then, the value of will be
(used )
(used )
1
28
2
24
3
32
4
27