Kinetic Theory

The r.m.s. speed of oxygen molecules at 47 is equal to that of the hydrogen molecules kept at . (Mass of oxygen molecule/mass of hydrogen molecule = 32/2)

1. -100
2. -253
3. -20
4. -235

Match the List I with List II Choose the correct answer from the options given below:

1. A-III, B-IV, C-I, D-II
2. A-II, B-IV, C-I, D-III
3. A-IV, B-II, C-III, D-I
4. A-III, B-II, C-IV, D-I

The helium and argon are put in the flask at the same room temperature (300 K). The ratio of average kinetic energies (per molecule) of helium and argon is: (Given: Molar mass of helium = 4 g/mol, Molar mass of argon = 40 g/mol)

1. 1 : 10
2. 10 : 1
3. 1 : 10
4. 1 : 1

The mean free path and the average speed of oxygen molecules at 300 K and 1 atm are 3 10-7 m and 600 m/s, respectively. Find the frequency of its collisions.

1. 5 108/s
2. 9 105/s
3. 2 1010/s
4. 2 109/s

There are two vessels filled with an ideal gas where volume of one is double the volume of the other. The large vessel contains the gas at 8 kPa at 1000 K while the smaller vessel contains the gas at 7 kPa at 500 K. If the vessels are connected to each other by a thin tube allowing the gas to flow and the temperature of both vessels is maintained at 600 K, at steady state the pressure in the vessels will be (in kPa).

1. 24
2. 4.4
3. 18
4. 6

A is the specific heat ratio of monoatomic gas A having 3 translational degrees of freedom. B is the specific heat ratio of polyatomic gas B having 3 translational, 3 rotational degrees of freedom and 1 vibrational mode. If A B = (1 + 1n ), then the value of n is .

The internal energy of air in 4 m 4 m 3 m sized room at 1 atmospheric pressure will be 106 J (Consider air as diatomic molecule)

A container of fixed volume contains a gas at 27 . To double the pressure of the gas, the temperature of gas should be raised to .

For a particular ideal gas which of the following graphs represents the variation of mean squared velocity of the gas molecules with temperature?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

The ratio of vapour densities of two gases at the same temperature is 425, then the ratio of r.m.s. velocities will be :

1. 52
2. 254
3. 425
4. 25