One mole of monoatomic gas and three moles of diatomic gas are put together in a container. The molar specific heat at constant volume is
1. 18.7
2. 18.9
3. 19.2
4. None of the above
The number of translational degrees of freedom for a diatomic gas is
1. 2
2. 3
3. 5
4. 6
A gaseous mixture consists of 16g of helium and 16g of oxygen. The ratio of the mixture is
1. 1.4
2. 1.54
3. 1.59
4. 1.62
The pressure exerted by the gas on the walls of the container because
1. It loses kinetic energy
2. It sticks with the walls
3. On collision with the walls there is a change in momentum
4. It is accelerated towards the walls
Gas at a pressure is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to
1.
2.
3.
4.
Consider a gas with density and as the root mean square velocity of its molecules contained in a volume. If the system moves as whole with velocity v, then the pressure exerted by the gas is
1.
2.
3.
4.
In kinetic theory of gases, a molecule of mass m of an ideal gas collides with a wall of vessel with velocity V. The change in the linear momentum of the molecule is
1. 2mV
2. mV
3. – mV
4. Zero
The ratio of mean kinetic energy of hydrogen and oxygen at a given temperature is
1. 1 : 16
2. 1 : 8
3. 1 : 4
4. 1 : 1
A sealed container with negligible coefficient of volumetric expansion contains helium (a monoatomic gas). When it is heated from 300 K to 600 K, the average K.E. of helium atoms is
1. Halved
2. Unchanged
3. Doubled
4. Increased by factor
The kinetic energy of translation of 20 gm of oxygen at 47°C is (molecular wt. of oxygen is 32 gm/mol and R = 8.3 J/mol/K)
1. 2490 joules
2. 2490 ergs
3. 830 joules
4. 124.5 joules