Melting

Q. How is evaporation different from sublimation?

Q.

In which of the following substances the interparticle forces of attraction are the strongest.

1. Sodium chloride

2. Ink

3. Honey

4. Carbon dioxide

Q. $$\begin{array}{cc}\text{State}& \text{Rainfall (in mm)}\\ \text{Arunachal Pradesh}& \text{162}\\ \text{Kerala}& \text{210}\\ \text{Gujarat}& \text{24}\\ \text{Rajasthan}& \text{3.6}\end{array}$$Given above is the state wise distribution of rainfall for the month of October in India. Based on this table, arrange the states according to their level of water table.

1. Kerala > Gujarat > Rajasthan > Arunachal Pradesh
2. Arunachal Pradesh > Kerala > Gujarat > Rajasthan
3. Rajasthan > Gujarat > Arunachal Pradesh > Kerala
4. Kerala > Arunachal Pradesh > Gujarat > Rajasthan

Q. Choose the correct statement regarding the conversion of ice into water.

a) Ice converts into water by releasing heat.
b) Ice converts into water by absorbing heat.
c) Ice neither absorbs nor releases heat while converting into water.
d) It is not possible to convert ice into water.

Q. Among the following temperatures, the motion of water particles will be fastest at ____.

1. ${50}^0$C
2. $0^0$C
3. ${100}^0$C
4. ${10}^0$C

Q. Explain the process by which we can obtain the solids of naphthalene back from its vapour state?

Q. The _______________ is the temperature at which a substance changes its state from solid to liquid.

1. freezing point
2. boiling point
3. melting point
4. condensation

Q. (A): How naphthalene balls kept in stored clothes in our homes disappear over a period of time?

(B): Name the terms for the following :​
(i) The change of a solid into liquid
(ii) The force of attraction between the molecules of matter.​
(iii) The particles of matter which may or may not have independent existence.​

Q. During melting, the state of a chocolate is changed from _______________.

1. gas to liquid
2. liquid to gas
3. liquid to solid
4. solid to liquid

Q.

Rolling of chapatti is an example of physical change and baking of chapatti is an example of _______ change.

1. Chemical

2. Periodic

3. Physical

4. Both physical & chemical

Q. Melting of ice is a reversible change.

1. True
2. False

Q.

What kind of change does this image represent?

1. Irreversible change

2. Both reversible and irreversible change.

3. No change.

4. Reversible change.

Q. When salt is added on an ice cube its melting point ______ .

1. fluctuates
2. decreases
3. remains same
4. increases

Q. The process by which solid changes into liquid is known as _____.

1. diffusion
2. sublimation
3. fusion
4. evaporation

Q.

Rolling of chapatti is an example of physical change and baking of chapatti is an example of _______ change.

1. Chemical

2. Physical

3. Both physical & chemical

4. Periodic

Q. Consider the following statements.

Statement 1: The change in which one or more substances lose their identity and form one or more new substances are known as chemical changes.

Statement 2: Process of rolling dough is an example of physical change.

1. Both statements are true.
2. Both statements are false.
3. Only statement 1 is true.
4. Only statement 2 is true.

Q. Solids generally expand on heating.

1. False
2. True

Q. The process by which solid changes into liquid is known as _____.

1. sublimation
2. diffusion
3. evaporation
4. fusion

Q. Choose the correct statement regarding the conversion of ice into water.

1. It is not possible to convert ice into water.
2. Ice neither absorbs nor releases heat while converting into water.
3. Ice converts into water by releasing heat.
4. Ice converts into water by absorbing heat.

Q. How is evaporation different from sublimation?