# Topic: UNIT IX: Kinetic Theory of Gases (Test 1)

Topic: UNIT IX: Kinetic Theory of Gases
Q.1
A particle of mass m is moving with speed u in a direction which makes 60° with respect to x axis. It undergoes elastic collision with the wall. What is the change in momentum in x and y direction?

A. px = −mu, ∆py = 0
B. px = −2mu, ∆py = 0
C. px = 0, ∆py = mu
D. px = mu, ∆py = 0
Explaination / Solution:
No Explaination.

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Q.2
A sample of ideal gas is at equilibrium. Which of the following quantity is zero?
A. rms speed
B. average speed
C. average velocity
D. most probable speed
Explaination / Solution:
No Explaination.

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Q.3
An ideal gas is maintained at constant pressure. If the temperature of an ideal gas increases from 100K to 1000K then the rms speed of the gas molecules
A. increases by 5 times
B. increases by 10 times
C. remains same
D. increases by 7 times
Explaination / Solution:
No Explaination.

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Q.4
Two identically sized rooms A and B are connected by an open door. If the room A is air conditioned such that its temperature is 4° lesser than room B, which room has more air in it?
A. Room A
B. Room B
C. Both room has same air
D. Cannot be determined
Explaination / Solution:
No Explaination.

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Q.5
The average translational kinetic energy of gas molecules depends on
A. number of moles and T
B. only on T
C. P and T
D. P only
Explaination / Solution:
No Explaination.

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Q.6
If the internal energy of an ideal gas U and volume V are doubled then the pressure
A. doubles
B. remains same
C. halves
Explaination / Solution:
No Explaination.

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Q.7
The ratio γ = Cp/Cv for a gas mixture consisting of 8 g of helium and 16 g of oxygen is
A. 23/15
B. 15/23
C. 27/11
D. 17/27
Explaination / Solution:
No Explaination.

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Q.8
A container has one mole of monoatomic ideal gas. Each molecule has f degrees of freedom. What is the ratio of γ = Cp/Cv
A. f
B. f/2
C. f / [ f +2]
D. [f +2] / f
Explaination / Solution:
No Explaination.

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Q.9
If the temperature and pressure of a gas is doubled the mean free path of the gas molecules
A. remains same
B. doubled
C. tripled
Explaination / Solution:
No Explaination.

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Q.10
Which of the following shows the correct relationship between the pressure and density of an ideal gas at constant temperature?
A.
B.
C.
D.