Kinetic Theory of Gases Test

Result

Kinetic Theory of Gases Test - 7

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Weekly Quiz Competition

Question 1
4 / -1

An ideal gas (γ =1.5) is expanded adiabatically. How many times has the gas to be expanded to reduce the root mean square velocity of molecules 2.0 times?

A
4 times

B
16 times

C
8 times

D
2 times

Solution
Question 2
4 / -1

Root mean square speed of the molecules of ideal gas is v. If pressure is increased two times at constant temperature, the rms speed will become

A

B
v

C
2v

D
4v

Solution
Question 3
4 / -1

According to Maxwell's law of distribution of velocities of molecules, the most probable velocity is

A
greater than the mean velocity

B
equal to the mean velocity

C
equal to the root mean square velocity

D
less than the root mean square velocity

Solution
Question 4
4 / -1

To what temperature should the hydrogen at 327°C be cooled at constant pressure, so that the root mean square velocity of its molecules becomes half of its previous value?

A
–123°C

B
123°C

C
–100°C

D
0°C

Solution
Question 5
4 / -1

At what temperature rms speed of air molecules is doubled of that at NTP?

A
819°C

B
719°C

C
909°C

D
None of these

Solution
Question 6
4 / -1

Calculate the ratio of rms speeds of oxygen gas molecules to that of hydrogen gas molecules kept at the same temperature.

A
1 : 4

B
1 : 8

C
1 : 2

D
1 :6

Solution
Question 7
4 / -1

The root mean square velocity of gas molecules at 27 °C is 1365 ms ^-I . The gas is

A
O₂

B
He

C
N₂

D
CO₂

Solution
Question 8
4 / -1

The ratio of the vapour densities of two gases at a given temperature is 9 : 8. The ratio of the rms velocities of their molecules is

A
3 : 2√2

B
2√2 : 3

C
9 : 8

D
8 : 9

Solution
Question 9
4 / -1

The gas having average speed four times as that of SO₂ (molecular mass 64) is

A
He (molecular mass 4)

B
0₂ (molecular mass 32)

C
H₂ (molecular mass 2)

D
CH₄ (molecular mass 16)

Solution
Question 10
4 / -1

Six molecules speeds are 2 units, 5 units, 3 units, 6 units, 3 units and 5 units, respectively. The rms speed is

A
4 units

B
1.7 units

C
4.2 units

D
5 units

Solution