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# Selina solutions for Concise Physics Class 8 ICSE chapter 1 - Matter [Latest edition]

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## Chapter 1: Matter

### Selina solutions for Concise Physics Class 8 ICSE Chapter 1 Matter Objective Question [Pages 15 - 16]

Objective Question | Q 1.01 | Page 15

Write true or false

The temperature of a substance remains unaffected during its change of state.

• True

• False

Objective Question | Q 1.02 | Page 15

Write true or false

Ice melts at 100°C.

• True

• False

Objective Question | Q 1.03 | Page 15

Write true or false

Water at 100°C has more heat than the steam at 100°C.

• True

• False

Objective Question | Q 1.04 | Page 15

Write true or false

Evaporation of a liquid causes cooling.

• True

• False

Objective Question | Q 1.05 | Page 15

Write true or false

Water evaporates only at 100°C.

• True

• False

Objective Question | Q 1.06 | Page 15

Write true or false

Boiling takes place at all temperatures.

• True

• False

Objective Question | Q 1.07 | Page 15

Write true or false .

Evaporation takes place over the entire mass of the liquid.

• True

• False

Objective Question | Q 1.08 | Page 15

Write true or false

The process of a gas converting directly into solid is called vaporization.

• True

• False

Objective Question | Q 1.09 | Page 15

Write true or false

At high altitudes water boils above 100° C.

• True

• False

Objective Question | Q 1.1 | Page 15

Write true or false

The melting point of ice is 0°C.

• True

• False

Objective Question | Q 2.1 | Page 15

Fill in the blank

Evaporation takes place at ...............temperature.

Objective Question | Q 2.2 | Page 15

Fill in the blank

.............. process is just reverse of melting.

Objective Question | Q 2.3 | Page 15

Fill in the blank

.............. is a process that involves direct conversion of a solid into its vapour on heating.

Objective Question | Q 2.4 | Page 15

Fill in the blank

The temperature at which a solid converts into a liquid is called its .........

Objective Question | Q 2.5 | Page 16

Fill in the blank

The smallest unit of matter that exists freely in nature is called ...........

Objective Question | Q 2.6 | Page 16

Fill in the blank

Molecules of a substance are always in a state of............ and so they possess .............

Objective Question | Q 2.7 | Page 16

Fill in the blank

Intermolecular space is maximum in ........ less in .......... and the least in ....

Objective Question | Q 2.8 | Page 16

Fill in the blank

Intermolecular force of attraction is maxiumum in ..........less in .......and the least in ..........

Objective Question | Q 3 | Page 16

Match the following

 Column A Column B (a) Molecules (i) Water boils (b) 100° C (ii) Evaporation (c) 0° C (iii) Changes from solid to gas (d) At all temperatures (iv) Matter (e) Camphor (v) Water freezes
Objective Question | Q 4.1 | Page 16

Select the correct alternative

The inter-molecular force is maximum in

• solids

• gases

• liquids

• none of the above

Objective Question | Q 4.2 | Page 16

Select the correct alternative

The inter-molecular space is maximum in

• liquids

• solids

• gases

• none of the above

Objective Question | Q 4.3 | Page 16

Select the correct alternative

The molecules can move freely anywhere in

• gases

• liquids

• solids

• none of the above

Objective Question | Q 4.4 | Page 16

Select the correct alternative

The molecules move only within the boundary of

• liquids

• gases

• solids

• none of the above

Objective Question | Q 4.5 | Page 16

Select the correct alternative

The temperature at which a liquid gets converted into its vapour state is called its

• melting point

• boiling point

• dewpoint

• freezing point.

Objective Question | Q 4.6 | Page 16

Select the correct alternative

Rapid conversion of water into steam is an example of

• evaporation

• freezing

• melting

• vapourization.

Objective Question | Q 4.7 | Page 16

Select the correct alternative

Evaporation takes place from the

• surface of liquid

• throughout the liquid

• mid-portion of the liquid

• bottom of liquid.

Objective Question | Q 4.8 | Page 16

Select the correct alternative

Boiling takes place from the

• the surface of the liquid

• throughout the liquid

• mid-portion of liquid

• none of the above.

### Selina solutions for Concise Physics Class 8 ICSE Chapter 1 Matter Short/Long Answer Questions [Pages 16 - 17]

Short/Long Answer Questions | Q 1 | Page 16

Define the term matter. What is it composed of ?

Short/Long Answer Questions | Q 2 | Page 16

State three properties of molecules of a matter.

Short/Long Answer Questions | Q 3 | Page 16

What do you mean by the inter-molecular spaces ? How do they vary in different states of matter ?

Short/Long Answer Questions | Q 4 | Page 16

What is meant by the inter-molecular forces of attraction? How do they vary in solids, liquids and gases?

Short/Long Answer Questions | Q 5.1 | Page 16

Which of the following is correct ?

Solids have definite shape and definite volume.

• True

• False

Short/Long Answer Questions | Q 5.2 | Page 16

Which of the following is correct?

Liquids have definite volume but do not have definite shape.

• True

• False

Short/Long Answer Questions | Q 5.3 | Page 16

Which of the following is correct?

Gases have definite volume but no definite shape.

• True

• False

Short/Long Answer Questions | Q 5.4 | Page 16

Which of the following is correct?

Liquids have definite shape and definite volume.

• True

• False

Short/Long Answer Questions | Q 6 | Page 16

Discuss the three states of matter solid, liquids and gas on the basis of molecular model.

Short/Long Answer Questions | Q 7 | Page 17

What do you mean by the change of state ? Write the flow chart showing the complete cycle of change of state.

Short/Long Answer Questions | Q 8 | Page 17

Differentiate between melting point and boiling point, giving atleast one example of each.

Short/Long Answer Questions | Q 9.1 | Page 17

Describe the process of condensation  with examples.

Short/Long Answer Questions | Q 9.2 | Page 17

Describe the process of  sublimation with examples.

Short/Long Answer Questions | Q 10.1 | Page 17

Explain the term melting .

Short/Long Answer Questions | Q 10.2 | Page 17

Explain the term melting point.

Short/Long Answer Questions | Q 11 | Page 17

Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.

Short/Long Answer Questions | Q 12.1 | Page 17

Explain the terms vaporization.

Short/Long Answer Questions | Q 12.2 | Page 17

Explain the terms boiling point.

Short/Long Answer Questions | Q 13.1 | Page 17

A liquid can change into vapour state at a fixed temperature.

Short/Long Answer Questions | Q 13.2 | Page 17

A liquid can change into vapour state at all temperatures.

Short/Long Answer Questions | Q 13.3 | Page 17

Name the processes involved in two cases.

Short/Long Answer Questions | Q 14 | Page 17

Some ice is taken in a beaker and its temperature is recorded after each one minute. The observations are listed below

 Time (in minute) Temperature (in °C) 0 0 1 0 2 0 3 0 4 0 5 0 6 3.8

 7 7.6 8 11.4

From the above observations what conclusion do you draw about the melting point of ice ?

Short/Long Answer Questions | Q 15 | Page 17

Describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature.

Short/Long Answer Questions | Q 16.1 | Page 17

State  the melting point of ice.

Short/Long Answer Questions | Q 16.2 | Page 17

State the boiling point of water.

Short/Long Answer Questions | Q 17 | Page 17

What is evaporation ?

Short/Long Answer Questions | Q 18 | Page 17

State three factors which affect the rate of evaporation of a liquid.

Short/Long Answer Questions | Q 19 | Page 17

Wet clothes dry more quickly on a warm dry day than on a cold humid day. Explain.

Short/Long Answer Questions | Q 20 | Page 17

Water in a dish evaporates fasterjhan in a bottle. Give reason.

Short/Long Answer Questions | Q 21 | Page 17

Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles ?

Short/Long Answer Questions | Q 22 | Page 17

A certain quantity of water is heated from 20°C to 100°C. Its temperature is recorded after each 1 minute. The observations are:

 Time (in minute) Temperature (in °C) 0 20 1 30 2 40 3 50 4 60 5 70 6 80 7 90 8 100 9 100 10 100 11 100 12 100
What conclusion do you draw from the above table about the boiling point of water? Explain.
Short/Long Answer Questions | Q 23 | Page 17

Why is cooling produced on evaporation of a liquid ?

Short/Long Answer Questions | Q 24 | Page 17

Explain with an example to demonstrates that when a liquid
evaporates, it takes heat from its surroundings.

Short/Long Answer Questions | Q 25 | Page 17

Give two applications of evaporation.

Short/Long Answer Questions | Q 26 | Page 17

Explain why in hot summer days water remains cool in earthen pots.

Short/Long Answer Questions | Q 27 | Page 17

A patient suffering from high fever is advised to put wet clot strips on his forehead. Why ?

Short/Long Answer Questions | Q 28 | Page 17

What do you mean by sublimation ? Explain with an example.

Short/Long Answer Questions | Q 29 | Page 17

Why does the size of naphthalene balls decrease when left open ?

Short/Long Answer Questions | Q 30 | Page 17

Describe an experiment to demonstrate the process of sublimation.

## Selina solutions for Concise Physics Class 8 ICSE chapter 1 - Matter

Selina solutions for Concise Physics Class 8 ICSE chapter 1 (Matter) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Physics Class 8 ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Concise Physics Class 8 ICSE chapter 1 Matter are Kinetic Theory of Matter, Three States of Matter in Terms of Movement of Particles, Energy Content in the Three States of Matter, Change of State in Matter Using the Kinetic Theory: - Boiling, Change of State in Matter Using the Kinetic Theory: - Vaporization, Change of State in Matter Using the Kinetic Theory: - Melting, Change of State in Matter Using the Kinetic Theory: - Fusion, Change of State in Matter Using the Kinetic Theory: Evaporation, Change of State in Matter Using the Kinetic Theory: - Condensation, Change of State in Matter Using the Kinetic Theory: Sublimation, Change of State in Matter Using the Kinetic Theory: - Deposition, Change of State in Matter Using the Kinetic Theory: - Freezing, Change of State Diagrams.

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