Kinetic Energy of Particles of Matter

Q.

The smell of hot sizzling food reaches you several meters away, but to get the smell of cold food you have to go close. Explain.

Q.

Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close. Why?

Q.

Evaporation occurs at the surface of a liquid because the particles at the surface:

1. Have sufficient energy to break through the forces of attraction between them

2. Are very light as compared to the particles beneath

3. Are pulled by the particles of air with more force

4. Are pushed up by the particles beneath

Q. In which of the following phase change processes, kinetic energy of the particles decreases ?

1. Deposition
2. Fusion
3. Solidification
4. Condensation

Q. Assume a gas stored in a container at room temperature. Identify the physical effect(s) that is/are caused by the motion of the particles of gas inside the container.

1. Kinetic Energy
2. Pressure
3. Potential Energy
4. Temperature

Q. Increase in temperature of a particle, increases its kinetic energy.

1. True
2. False

Q.

The kinetic energy of particles increases with an increase in

1. Temperature

2. Mass

3. Pressure

4. Density

Q.

Which one of the following set phenomena would increase on raising the temperature?

(a) diffusion, evaporation, compression of gases

(b) evaporation, compression of gases, solubility

(c) evaporation, diffusion, expansion of gases

(d) evaporation, solubility, diffusion, compression of gases

Q.

Out of solid, liquid or gaseous state, which state has low molecular motion of its molecules ?

Q.

The kinetic energy of molecules is _____ in solids and maximum in gases.

Q. The motion of particles is because of their _________ which ________ with rising temperature.

1. potential energy, decreases
2. kinetic energy, decreases
3. potential energy, increases
4. kinetic energy, increases

Q.

Question 1
Which one of the following sets of phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases

Q. In which of the following phase change processes, kinetic energy of the particles increases ?

1. Sublimation
2. Condensation
3. Fusion
4. Vaporization

Q.

Solids do not diffuse when they are kept in contact with one another.

1. True
2. False

Q.

Gases diffuse very fast. Why ?

Q.

The smell of hot sizzling food reaches you several meters away, but to get the smell of cold food you have to go close.

Q.

Which one of the following sets of phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases

Q.

On increasing the temperature the kinectic energy of particles

1. Increases

2. Decreases

3. First increases then decreases.

4. Decreases rapidly.

Q. have no definite shape and volume.

Q.

The random motion of particles decreases on supplying energy.

1. True

2. False

Q.

Which property of gases has not been possessed by solids?

Q. Effusion is a special case of __________.

1. Diffusion
2. Precipitation
3. None of these
4. Both (a) and (b)

Q. Rate of diffusion is highest in _______ and lowest in _________ respectively .

1. gases, solids
2. liquids, gases
3. liquids, solids
4. solids, liquids

Q. The process in which gas molecules intermixes as a result of random motion is known as ___________.

1. diffusion
2. distillation
3. filtration
4. evaporation

Q. Question 1
Which one of the following sets of phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases

Q. The process in which gas molecules intermixes as a result of random motion is known as ___________.

1. filtration
2. evaporation
3. diffusion
4. distillation

Q. have no definite shape and volume.

1. Solids
2. Gases
3. Liquids