Interconversion of State

Q.

Does melting point increase with pressure?

Q.

Why is the latent heat of vaporization higher than fusion?

Q.

What is the unit of the coefficient of thermal conductivity K?

Q. What happens when ice is heated? Is it a reversible or an Irreversible change? justify your answer

Q.

Is rusting of iron a reversible change?

Q. Mercury, a metal filled inside a thermometer rise and fall as per the change in our body temperature. This change is an example of _____ change.

1. an irreversible physical
2. an irreversible chemical
3. a reversible physical
4. a reversible chemical

Q.

What is the change of a substance from solid to liquid called? [1 MARK]

Q.

Evaporation of water is (a reversible/an irreversible) change.

1. a reversible

2. an irreversible

Q.

Question 9

A piece of iron is heated till it becomes red hot. It then becomes soft and is beaten to the desired shape. What kind of changes are observed in this process; reversible or irreversible?

Q.

Identify the process 'X' and 'Y' in the below image from the given options.

1. X:- Precipitation, Y:- Evaporation

2. X:- Evaporation, Y:- Condensation

3. X:- Evaporation, Y:- Precipitation

4. X:- Condensation, Y:- Evaporation

Q.

Which of the following is correct regarding physical and chemical changes?

1. A chemical change is irreversible whereas a physical change is reversible.

2. A chemical change is reversible whereas a physical change is irreversible.

3. Both the chemical and physical changes are irreversible.

4. Both the chemical and physical changes are reversible.

Q. In which of the following examples, a change in state is observed?​

1. Tearing of paper
2. Breaking of glass​
3. Boiling of water​
4. Crushing of can

Q.

Question 19

Paheli mixed flour and water and (a) made a dough, (b) rolled the dough to make a chapatti, (c) baked the chapatti on a pan, (d) dried the chapatti and ground it in a grinder to make powder. Identify the changes (a) to (d) as the changes that can be reversed or that cannot be reversed.

Q. Complete the steps involved in the water cycle.
Evaporation $\to$ A $\to$ B $\to$ Infiltration.

1. A $\to$ Precipitation
   B $\to$ Condensation
2. A $\to$ Filtration
   B $\to$ Condensation
3. A $\to$ Precipitation
   B $\to$ Filtration
4. A $\to$ Condensation
   B $\to$ Precipitation

Q.

Under normal conditions, naphthalene changes its state from _______.

1. solid to liquid

2. liquid to gas

3. liquid to solid

4. solid to gas

Q.

The burns caused by boiling water is more severe than steam.

1. True
2. False

Q. Water vapour reforms into droplets by the process of:

1. Evaporation
2. Rainfall
3. Precipitation
4. Condensation

Q.

Germination of seed

inflation of baloon

(chemical or physical change)

Q.

Identify the process 'X', from the image below.

1. Solidification

2. Melting

3. Vapourisation

4. Condensation

Q.

Which of the following can be categorised as both chemical and physical change?

1. Formation of curd from milk.

2. Melting of wax in a candle.

3. Both melting of wax and formation of curd from milk.

4. Neither melting of wax and formation of curd from milk.

Q.

__________ is a physical process through which a solid is converted into a liquid.

1. Freezing

2. Cooling

3. Melting

4. Condensation

Q. It is there that matter changes there form when temperature increases and pressure decreases then what about a brick

Q.

Identify the process 'X' and 'Y' in the below image from the given options.

1. X:- Condensation, Y:- Evaporation

2. X:- Evaporation, Y:- Condensation

3. X:- Precipitation, Y:- Evaporation

4. X:- Evaporation, Y:- Precipitation

Q. 10 g of steam passes over an ice block. What amount of ice will melt?

1. 8 g
2. 18 g
3. 45 g
4. 80 g

Q. Pair the given images with their respective phenomena.

1. 
2. 
3. 
4. Boiling
5. Melting
6. Condensation

Q. Water vapour _______ on cooling.

1. expands
2. condenses
3. solidifies
4. evaporates

Q. Which of the following pairs of processes involve to and​ fro interconversion amongst two states of water?​ ​

1. Evaporation and melting
2. Evaporation and condensation
3. Freezing and condensation​
4. Melting and freezing​

Q.

Which of the following statement is true for matter?

1. Massless

2. Occupies space

3. Weightless

4. Occupies no space

Q.

Identify the process 'X' and 'Y' in the below image from the given options.

1. X:- Condensation, Y:- Evaporation

2. X:- Evaporation, Y:- Condensation

3. X:- Precipitation, Y:- Evaporation

4. X:- Evaporation, Y:- Precipitation

Q.

Chose the correct statement.
(A) The melting point of all substances decreases with an increase in pressure.
(B) The boiling point of water increases with the addition of impurities.

1. Only (A) is correct

2. Only (B) is correct

3. Both (A) and (B) are correct

4. Both (A) and (B) are incorrect