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Kinetic molecular theory based MCQ

Question 1:

Which of the given option,is the smallest unit of length?

A) Micron
B) Fermi
C) Angstrom
D) Nanometer
Explanation:

Question 2:

Which of the following is valid at absolute zero?

A) Kinetic energy of the gas becomes zero and molecular motion also becomes zero
B) Kinetic energy of the gas becomes zero but the molecular motion does not become zero
C) Kinetic energy of the gas decreases but does not become zero
D) Kinetic energy of the gas is maximum
Explanation: Kinetic Energy is directly proportional to temperature of matter. With increase in temperature, kinetic energy increases and the movement of the particles gets faster. With decrease in temperature reverse phenomenon is observed. At Absolute Zero temperature (−273.15°C), all the molecules have no kinetic energy and hence no molcecular motion ceases. Absolute Zero is a theoretical value (it has never been achieved).

Question 3:

What is the value of absolute zero temperature?

A) -273°C
B) -273K
C) 0°C
D) none
Explanation: Theoretically it is calculated that the last limit of temperature is -273°C. This temperature is known as the absolute zero temperature. Absolute zero value in Kelvin scale is denoted as 0K.
-273°C = 0K

Question 4:

Force of attraction between similar molecules is called -------.

A) Cohesive force
C) Magnetic force
D) Gravitational force
Explanation: The force of attraction between the molecules of the same substance is called a cohesive force. A force of attraction between the molecules of different substances is called as adhesive force.

Question 5:

The bulb of a thermometer when dipped in petrol and then taken out, the level of the mercury thread in the thermometer............

A) Strat falling
B) Strat Raising
C) Remains at same level
D) None of these
Explanation: The bulb of a thermometer when dipped into Petrol and then taken out, the level of the mercury thread in the thermometer starts falling because the petrol which is avialable on the surface of bulb of a thermometer evaporates due to the heat of surrounding and the thermometer and makes the surface of bulb, cool.

Question 6:

The high diffusibility of gases is due to

A) High intermolecular force
B) High K.E of moleculs of gas
C) Ristricted translatory motion in upward direction
D) all of them
Explanation: The molecules of gases are always in random motion and will possess high kinetic energy resulting high diffusibility .

Question 7:

Maximum intermolecular forces of attraction exist in

A) Bromine
B) Oxygen
C) Copper
D) Air
Explanation:This is because bromine is a naturally occurring element Which is liquid state at the room temperature . Whereas, oxygen can be a solid, liquid or gas depends upon temperature and pressure and air exist in the gaseous state.Therefore, maximum intermolecular forces of attraction exist in copper.

Question 8:

Identify the element from the following:

A) Air
B) Iodine Vapour
C) Water Vapour
D) Amalgum
Explanation: Elements are pure substances made up of only one kind of atoms.Air is mixture of gases. Iodine Vapour is pure element.Water Vapour is compound. Amalgum is mixture.

Question 9:

Gases ....... and occupy all the space that is available to them.

A) Contract
B) Expend
C) Compress
D) none
Explanation: Gases occupy all the available space because their molecules are very loosely packed.

Question 10:

Why pressure is exerted by the gas on the walls of the container in all directions?

A) They consist of identical particles.
B) Molecules collid with each other during random motion also hit the wall of container.
C) Gas have no definite shape
D) More forces of attraction
Explanation: A gas exerts pressure on the walls of the container because the particles of gas move randomly in all directions at high speed. As a result, the particles hit each other and also hit the walls of the container with force.

Question 11:

There is an increase in temperature of an object then the kinetic energy of the object............

A) Decrease.
B) Increase.
C) Remains same.
D) It is not related with temperture.
Explanation:On increasing the temperature the kinetic energy of the particle will also increases.

Question 12:

If the temperature of a gas is 75 K and it is heated until temperture raise to 150 k then, what do you understand regarding kinetic energy in this process?

A) Havled.
B) Doubled.
C) Tripled.
D) Can't say.
Explanation: According to the kinetic molecular theory of gases, if the Absolute Temperature of a gas is doubled then the kinetic energy is also doubled because temperture is directly proportional to K.E.

Question 13:

Which one is not a postulate of the kinetic theory of gases?

A) Gas particles move in a straight line between collisions.
B) The molecules of a gas are always at rest position.
C) All gases at a given temperature have the same average kinetic energy.
D) The kinetic energy of a gas is a measure of its Kelvin temperature.
Explanation: Gas particles move in a straight line between collisions.All gases at a given temperature have the same average kinetic energy.The kinetic energy of a gas is a measure of its Kelvin temperature.The molecules of a gas are always at random motion.

Question 14:

When a gas behaves as an ideal gas.

A) High pressure and low temperature.
B) Low pressure and high temperature.
C) High pressure and high temperature.
D) Low pressure and low temperature.
Explanation: For an ideal gas, no intermolecular force exists. Since at low pressure and high temperature, the molecules in a gas are far apart, the gas behaves like an ideal gas.

Question 15:

Substances in which phase of matter have the most space between particles?

A) Solid
B) Liquid.
C) Gas.
D) None
Explanation: In a gas, particles are in continual straight-line motion and kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other.

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