### Physics - Kinetic Theory of Gases

#### Question - 1

Which one of the following graphs represent the behaviour of an ideal gas?

• A
• B
• C
• D

#### Question - 2

The number of molecules in V litre of a gas NTP is

• A ${N_0\over 22.4}\times V$
• B ${22.4\over N_0 }\times V$
• C $N_0\times 22.4\over V$
• D $N_0 \times V \times 22.4$

#### Question - 3

1L of hydrogen and 1L of oxygen are given at NTP.Which of them are correct?

• A Hydrogen has larger number of moles
• B Oxygen has larger number of moles
• C Both have same number of moles
• D None of the above

#### Question - 4

Real gas behaves as an ideal gas at

• A high temperature and high pressure
• B low temperature and high pressure
• C low pressure and high temperature
• D low pressure and low temperature

#### Question - 5

An ideal gas is

• A one which consists of massless particles
• B one satisfying assumption of kinetic theory
• C a gas consisting small particles
• D one that consists of molecules

#### Question - 6

In an ideal gas without preferred direction of motion molecules,

• A $v_x=v_y=v_z$
• B $v_x^2=v_x^y=v_z^2$
• C $\overset{-}{v}_x^2=\overset{-}{v}_y^2=\overset{-}{v}_z^2$
• D None of the above

#### Question - 7

Pressure of an ideal gas is i=ncreases by keeping temperature constant.What is effect on kinetic energy of molecules?

• A Increase
• B Decrease
• C No change
• D Cannot be determined

#### Question - 8

The average kinetic energy of a gas molecule at 270C is 6.2x10-21J.Its average kinetic energy at 1270C will be

• A 12.2x10-21J
• B 8.28x10-21J
• C 10.35x10-21J
• D 11.35x10-21J

#### Question - 9

Ratio of Vmp (most probable speed), Vav (average speed), Vrms (root mean square speed) of gas molecules are related as

• A $\sqrt{3}:\sqrt{2}:\sqrt{8\over \pi}$
• B $2:\sqrt{3}:\sqrt{\pi\over8}$
• C $\sqrt{2}:\sqrt{3}:\sqrt{8\over\pi}$
• D $\sqrt{2}:\sqrt{8\over\pi}:\sqrt{3}$

#### Question - 10

The root mean square (rms) speed of oxygen molecule (O2 )at a certain temperature T is V.If temperature is doubled and oxygen gets dissociated into atomic oxygen, what is speed of atomic oxygen?

• A 2v
• B 3v
• C v/2
• D 5v