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Test: Kinetic Theory (29 Sep) - JEE MCQ


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15 Questions MCQ Test Daily Test for JEE Preparation - Test: Kinetic Theory (29 Sep)

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Test: Kinetic Theory (29 Sep) - Question 1

The P-V diagram of a diatomic gas is a straight line passing through origin. The molar heat capacity of the gas in the process will be

Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 1
P-V diagram of the gas is a straight line passing through origin. Hence or constant Molar heat capacity in the process constant is Here (For diatomic gas)
Test: Kinetic Theory (29 Sep) - Question 2

The ratio of the adiabatic to isothermal elasticities of a triatomic (non-linear) gas is

Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 2

For triatomic non-linear gas degree of freedom, f = 6


∴ Ratio of adiabatic to isothermal elasticities of a triatomic (non-linear) gas is

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Test: Kinetic Theory (29 Sep) - Question 3

The specific heats, Cp and CV of gas of diatomic molecules, A, is given (in units of J mol −1K−1) by 29 and 22, respectively. Another gas of diatomic molecules, B, has the corresponding values 30 and 21. If they are treated as ideal gases, then

Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 3

Here and of A are 29 and 22 and and of are 30 and

For
Molecules A has 3 translational, 2 rotational and 1 vibrational degree of freedom
For B, Cp/Cv
i.e., B has 3 translational and 2 rotational degrees of freedom.

Test: Kinetic Theory (29 Sep) - Question 4
One mole of a gas occupies lit at N.T.P. Calculate the difference between two molar specific heats of the gas.
Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 4
litre
by ideal gas equation for one mole of a gas,
Test: Kinetic Theory (29 Sep) - Question 5
If for hydrogen and for the nitrogen , where and refer to specific heat per unit mass at constant pressure and specific heat per unit mass at constant volume respectively. The relation between and is
Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 5
Here, for hydrogen
Or
And for nitrogen, or

Test: Kinetic Theory (29 Sep) - Question 6
If the degree of freedom of a gas molecule is , then the ratio of two specific heats is given by
Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 6
Test: Kinetic Theory (29 Sep) - Question 7

The average translational kinetic energy of a molecule in a gas becomes equal to 0.69eV at temperature about, [Boltzmann's constant = 138 × 10−23 J K−1]

Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 7

Given, average translational kinetic energy
= 0.69eV = 0.69 × 1.6 × 10−19 V
As we know that, average translational kinetic energy 

Test: Kinetic Theory (29 Sep) - Question 8
and He are enclosed in identical containers under the similar conditions of pressure and temperature. The gases will have
Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 8
Here is constant
Test: Kinetic Theory (29 Sep) - Question 9

Let denote the ratio of specific heat for an ideal gas. Then choose the correct expression for number of degrees of freedom of a molecule of the same gas.

Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 9

For, = Total Energy, = Degree of freedom of molecule, We Know,
Molar heat capacity at constant volume
= Molar heat capacity at constant pressure
= Ratio of specific heats

Test: Kinetic Theory (29 Sep) - Question 10
Two identical calorimeters and contain an equal quantity of water at . A piece of metal of specific heat is dropped into and piece of metal is dropped into . The equilibrium temperature in is and that in is . The initial temperature of both the metals was . The specific heat of metal (in ) is
Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 10



Let be the specific heat of the metal , then


Therefore,

Test: Kinetic Theory (29 Sep) - Question 11
One mole of a diatomic gas undergoes a process , where and are constants. The translational kinetic energy of the gas when is given by
Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 11


Therefore, translational kinetic energy is equal to
Test: Kinetic Theory (29 Sep) - Question 12

Temperature at which the kinetic energy of gas molecule is half of the value of kinetic energy at

Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 12
Kinetic energy of a gas molecule

where is Boltzmann's constant.

or
or
Test: Kinetic Theory (29 Sep) - Question 13

A nitrogen molecule has some rms speed at on the surface of the earth. With this speed, it goes straight up. If there is no collisions with other molecules, the molecule will rise up to a height of

Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 13



After substituting the values and simplifying, we get h = 12.4 km

Test: Kinetic Theory (29 Sep) - Question 14
At constant volume, temperature is increased then
Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 14
As the temperature increases, the average velocity increases. So, the collisions are faster.
Test: Kinetic Theory (29 Sep) - Question 15
At what absolute temperature is the root mean square speed of a hydrogen molecule equal to its escape velocity from the surface of the moon? The radius of moon is is the acceleration due to gravity on moon's surface, is the mass of a hydrogen molecule and is the Boltzmann constant
Detailed Solution for Test: Kinetic Theory (29 Sep) - Question 15
The root mean square speed is given by

The escape velocity is given by
For , we require
or , which is choice (d).
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