Kinetic Theory Test

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Kinetic Theory Test - 18

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Question 1
1 / -0

Density is least in

A
Sold

B
Liquid

C
Both A and B

D
Gas

Solution

Interparticle space is maximum in gases so, it does not have definite volume. So, its density is least.
Question 2
1 / -0

The pictured graphs are intended to show the relationship between the volume of a gas and the pressure of the gas. Which graph most likely shows that the volume of the gas is inversely proportional to its pressure?

A

B

C

D

E

Solution

Volume of the gas is inversely proportional to its pressure i.e $$V \propto \dfrac{1}{P}$$
$$\implies$$ $$VP = constant$$
Hence V-P graph is a hyperbola as shown in option A.
Question 3
1 / -0

Which of the following property is used to identify whether a substance is a solid, liquid or gas ?

A
Conductivity

B
Number of protons

C
Temperature

D
Number of neutrons

E
Resistively

Solution

The temperature of a substance determines the state of the substance.
When temperature is below the freezing point of the substance, it is solid.
When temperature is above the boiling point of the substance, it is a gas.
When the temperature of substance falls in between this range, it is a liquid.
Question 4
1 / -0

According to Kinetic theory of gases , gases consist of particles that continue in:

A
straight line

B
zig zag line

C
circle

D
no particular line

Solution

Gases consist of particles in constant, random motion. They continue in a straight line until they collide with something usually each other or the walls of their container.
Question 5
1 / -0

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

A
Increase

B
Decrease

C
No change

D
Cannot be determined

Solution

The kinetic energy of molecules depends only on temperature. Since temperature is kept constant there is no change in kinetic energy of molecules.
Hence, option C is correct.
Question 6
1 / -0

Absolute zero (0K) is that temperature at which

A
Matter ceases to exit

B
Ice melts and water freezes

C
Volume and pressure of a gas become zero

D
None of the above

Solution

Absolute zero is characterised by no atomic motion.
Both Charles’ law and the pressure law lead to an extrapolation back to zero volume or pressure which would imply the temperature scale can go no further. For all gases, absolute zero is the same and although clearly the gas would no longer be a gas there, this is an important implication.
Question 7
1 / -0

The average kinetic energy of the particles of a gas is most closely associated with which of the following quantity?

A
heat capacity.

B
temperature.

C
specific heat.

D
absolute zero.

E
potential enemy.

Solution

Average kinetic energy of the particle $$K_{avg}=\dfrac{3}{2}k_{B}T$$ where $$T$$ is the temperature
Thus option B is correct.
Question 8
1 / -0

According to kinetic theory of matter particles of matter:

A
particles of matter are small

B
they are in random motion

C
they do not have space between them

D
both a and b

Solution

The kinetic theory of matter states that all matter is made of small particles that are in random motion and that have space between them. This means that no matter what phase matter is in, it is made of separate, moving particles.
Question 9
1 / -0

The number of degrees of freedom in an oxygen molecule is

A
3

B
4

C
5

D
6

Solution

Diatomic, like your oxygen molecule, can move in three dimensions and spin in two directions.
Total Degree of Freedom = 5.
Question 10
1 / -0

Total number of degrees of freedom of a rigid diatomic molecule is

A
3

B
6

C
5

D
2

E
7

Solution

Total number of degrees of freedom of a rigid diatomic molecule is 5.
i.e. 3 + 2 = 5 degree of freedom
Rigid diatomic molecules have 3 translational degrees of freedom and 2 rotational degrees of freedom.