Change of State

Q.

What do you understand by change of state? give two examples of change of state.

Q. Which of the following options is correct?

1. D
2. C
3. A
4. B

Q.

Define Particle.

Q.

What is a non-recording rain-gauge?

Q. Calculate the amount of KCl which must be added in 100 g of water so that freezing point is depressed by 2 K

Q.

Why do we keep water in an earthen pot during summer?

Q.

Why Does Rain Fall In Drops And Not As A Continuous Stream?

Q.

We studied in our earlier classes:

Anything that occupies space and has mass is called matter.

However light doesn't occupies space and do not have mass. Then why is it called Matter?

Q. How to prove BPT theorem?

Q.

11. Differentiate between evaporation, condensation, and precipitation.

Q.

Explain sublimation and deposition on the basis of kinetic theory

Q.

Why is cooling produced on evaporation of liquid?

Q.

The phenomenon in which solid directly changes into vapour is called

Q. The moisture in the atmosphere is called______.

1. salinity
2. humidity
3. viscosity
4. density

Q. Difference between heat and temperature.

Q.

The liquid which has the highest rate of evaporation is____?

1. Petrol

2. Honey

3. Water

4. Alcohol

Q.

Which of the following graph shows the variation in the volume of 1 g of water with the temperature in the range from $0{}^{\circ }C$ to $10{}^{\circ }C$?

1. 

2. 

3. 

4. 

Q.

In evaporation,

1. only the molecules at the surface escape out

2. the temperature of liquid rises by absorbing heat from surroundings.

3. the molecules at surface get attracted within the liquid.

4. all molecules of liquid begin to escape out

Q.

Conversion of ice into water is an example of

1. Melting

2. Evaporation

3. Sublimation

4. Freezing

Q.

Difference between heating and boiling

Q. In which container are the nitrogen molecules moving fastest?

1. Container at 200 k
2. Container at 250 k
3. Container at 300 k
4. They are all moving at the same speed.

Q. The picture below shows the changes in two states of matter. Identify the process $X$.

1. Freezing
2. Sublimation
3. Evaporation
4. Condensation

Q.

Briefly describe, how will you determine the specific latent heat of fusion of ice and what observation will you need?

Q. Solidification is the process in which carbon dioxide is converted into______.

1. Carbon monoxide
2. Ice
3. Dry ice
4. Carbon fuel

Q.

	Column l		Column ll
(A)	Conversion of liquid into solid is	(p)	Regelation
(B)	Conversion of a liquid into vapour is	(q)	Sublimation
(C)	Conversion of solid into vapour directly	(r)	Fusion
(D)	Melting of ice caused by pressure is	(s)	Vaporisation

1. A-r, B-q, C-p, D-s
2. A-p, B-q, C-r, D-s
3. A-q, B-p, C-s, D-r
4. A-r, B-s, C-q, D-p

Q.

Which condition out of the following will increase the evaporation of water?

1. Increase in temperature of water

2. Adding common salt to water

3. Less exposed surface area of water

4. Decrease in temperature of water

Q.

Sublimation is the process in which a solid changes directly into a gas.

1. True
2. False

Q.

Differentiate between Flammable and non-flammable substances.

Q.

How much mass of water at 100 ℃ must be heated so as to form steam at 100 ℃ when a burner supplies 45200 J of heat energy? Specific latent heat of vapourisation of water is 2260 J /g

1. 10 g

2. 20 g

3. 30 g

4. 40 g

Q.

The liquid that has the highest rate of evaporation is___

1. Petrol

2. Nail polish remover

3. Water

4. Alcohol