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![Selina solutions for Concise Physics [English] Class 8 ICSE chapter 1 - Matter - Shaalaa.com](/images/concise-physics-english-class-8-icse_6:53235d1491ff438fb024a108557878b3.jpg "Selina solutions for Concise Physics [English] Class 8 ICSE chapter 1 - Matter")
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Solutions for Chapter 1: Matter
Below listed, you can find solutions for Chapter 1 of CISCE Selina for Concise Physics [English] Class 8 ICSE.
Selina solutions for Concise Physics [English] Class 8 ICSE 1 Matter Objective Question [Pages 15 - 16]
The temperature of a substance remains unaffected during its change of state.
True
False
Ice melts at 100°C.
True
False
Water at 100°C has more heat than the steam at 100°C.
True
False
Evaporation of a liquid causes cooling.
True
False
Water evaporates only at 100°C.
True
False
Boiling takes place at all temperatures.
True
False
Evaporation takes place over the entire mass of the liquid.
True
False
The process of a gas converting directly into solid is called vaporization.
True
False
At high altitudes, water boils above 100° C.
True
False
The melting point of ice is 0°C.
True
False
Evaporation takes place at ...............temperature.
.............. process is just reverse of melting.
.............. is a process that involves direct conversion of a solid into its vapour on heating.
The temperature at which a solid convert into a liquid is called its .........
The smallest unit of matter that exists freely in nature is called ...........
Molecules of a substance are always in a state of............ and so they possess .............
Intermolecular space is maximum in .......... less in ............ and the least in .........
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
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 |
The inter-molecular force is maximum in
solids
gases
liquids
none of the above
The inter-molecular space is maximum in
liquids
solids
gases
none of the above
The molecules can move freely anywhere in
gases
liquids
solids
none of the above
The molecules move only within the boundary of
liquids
gases
solids
none of the above
The temperature at which a liquid gets converted into its vapour state is called its
melting point
boiling point
dewpoint
freezing point.
Rapid conversion of water into steam is an example of
evaporation
freezing
melting
vapourization.
Evaporation takes place from the
surface of liquid
throughout the liquid
mid-portion of the liquid
bottom of liquid.
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 [English] Class 8 ICSE 1 Matter Short/Long Answer Questions [Pages 16 - 17]
Define the term matter. What is it composed of?
State three properties of molecules of a matter.
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
What is meant by the intermolecular forces of attraction? How do they vary in solids, liquids and gases?
Solids have definite shape and definite volume.
True
False
Liquids have definite volume but do not have definite shape.
True
False
Gases have definite volume but no definite shape.
True
False
Liquids have definite shape and definite volume.
True
False
Discuss the three states of matter solid, liquids and gas on the basis of molecular model.
What do you mean by the change of state? Write the flow chart showing the complete cycle of change of state.
Differentiate between melting point and boiling point, giving atleast one example of each.
Describe the process of condensation with examples.
Describe the process of sublimation with examples.
Explain the term Melting.
Explain the term Melting Point.
Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.
Explain the terms vaporization.
Explain the terms boiling point.
A liquid can change into vapour state at a fixed temperature.
A liquid can change into vapour state at all temperatures.
Name the processes involved in two cases.
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?
Describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature.
State the melting point of ice.
State the boiling point of water.
What is evaporation?
State three factors which affect the rate of evaporation of a liquid.
Wet clothes dry more quickly on a warm dry day than on a cold humid day. Explain.
Water in a dish evaporates faster than in a bottle. Give reason.
Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles?
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 |
Why is cooling produced on evaporation of a liquid?
Explain with an example to demonstrates that when a liquid evaporates, it takes heat from its surroundings.
Give two applications of evaporation.
Explain why in hot summer days water remains cool in earthen pots.
A patient suffering from high fever is advised to put wet clot strips on his forehead. Why?
What do you mean by sublimation? Explain with an example.
Why does the size of naphthalene balls decrease when left open?
Describe an experiment to demonstrate the process of sublimation.
Solutions for 1: Matter
Selina solutions for Concise Physics [English] Class 8 ICSE chapter 1 - Matter
Shaalaa.com has the CISCE Mathematics Concise Physics [English] Class 8 ICSE CISCE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. Selina solutions for Mathematics Concise Physics [English] Class 8 ICSE CISCE 1 (Matter) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. Selina textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Concise Physics [English] Class 8 ICSE chapter 1 Matter are Matter (Substance), Characteristics of Particles (Molecules) of Matter, States of Matter, The Solid State, The Liquid State, The Gaseous State, Heat and change of physical state, Concept of Melting (Fusion), Concept of Boiling (Vaporization), Concept of Condensation (Liquefaction), Concept of Sublimation, Concept of Desublimation (Deposition), Concept of Evaporation, Concept of Freezing (Solidification).
Using Selina Concise Physics [English] Class 8 ICSE solutions Matter exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in Selina Solutions are essential questions that can be asked in the final exam. Maximum CISCE Concise Physics [English] Class 8 ICSE students prefer Selina Textbook Solutions to score more in exams.
Get the free view of Chapter 1, Matter Concise Physics [English] Class 8 ICSE additional questions for Mathematics Concise Physics [English] Class 8 ICSE CISCE, and you can use Shaalaa.com to keep it handy for your exam preparation.
