Practise Class 8 Science Chapter 7 – Particulate Nature of Matter with this easy NCERT Curiosity worksheet. Includes important questions and revision exercises to strengthen understanding of matter, particles and their properties and prepare effectively for class tests and exams.
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Particulate Nature of Matter
Grade 8 Science – Fresh Worksheet
Curiosity – Textbook of Science
Name: ____________________
Class: __________
Date: ____________________
Section A – Multiple Choice Questions
1. Which statement best explains why a solid has a fixed shape?
2. Which state of matter has the largest interparticle spacing?
3. What happens to the particles of a solid when it is heated?
4. Which property allows a gas to fill the entire available space?
5. Which process occurs only at the surface of a liquid?
6. Why can gases be compressed easily?
7. What happens to the interparticle attraction when particles move farther apart?
8. Sugar disappears when stirred in water because:
Section B – Fill in the Blanks
Word Bank: particles, evaporation, solid, gas, attraction, liquid, spaces, melting
1. Matter is made up of very small __________.
2. The force that holds particles together is called interparticle __________.
3. A __________ has a definite shape and a definite volume.
4. A __________ has a definite volume but no fixed shape.
5. A __________ has neither a fixed shape nor a fixed volume.
6. The process by which a liquid changes into vapour from its surface is called __________.
7. There are large __________ between the particles of a gas.
8. The change of a solid into a liquid is called __________.
Section C – True or False
1. Matter is made up of tiny particles.
2. Particles in a solid can move freely throughout the container.
3. Liquids have a fixed volume.
4. Gases have negligible interparticle attraction.
5. Evaporation can occur only at the boiling point.
6. Heating increases the motion of particles.
7. Sand dissolves completely in water like sugar.
8. Gas particles can move throughout the available space.
Section D – Match the Following
| Column A | Column B |
|---|---|
| 1. Solid | a. No fixed shape and no fixed volume |
| 2. Liquid | b. Surface change into vapour |
| 3. Gas | c. Definite shape and volume |
| 4. Evaporation | d. Definite volume but no fixed shape |
| 5. Melting | e. Solid changes into liquid |
Section E – Very Short Answer Questions
1. What is matter?
2. What are constituent particles?
3. Name the three common states of matter.
4. Which state of matter has the strongest interparticle attraction?
5. Which state of matter has the weakest interparticle attraction?
6. What is melting?
7. What is evaporation?
8. Why can liquids flow?
Section F – Short Answer Questions
1. Why does a solid have a fixed shape?
2. Why does a liquid take the shape of its container?
3. Why does a gas occupy the entire container?
4. Explain why gases are more compressible than solids.
5. Why can we smell perfume from a distance?
6. Why does sugar dissolve in water but sand does not?
7. What happens to the movement of particles when a substance is heated?
8. Differentiate between evaporation and boiling.
| Evaporation | Boiling |
|---|---|
Section G – Think and Apply
1. A balloon is filled with air and kept in sunlight. What may happen to the balloon? Explain using the idea of particles.
2. A drop of ink is added to a glass of water. After some time, the colour spreads throughout the water. What does this show?
3. Why does the smell of food spread through a house?
4. A student says, “There are no spaces between particles in a solid.” Is the statement correct? Explain.
5. Ice changes into water and water changes into water vapour. What happens to particle spacing in these changes?
6. Why does a wet cloth dry faster on a hot, windy day?
Section H – Particle Arrangement
1. Complete the particle arrangement by drawing particles in the boxes.
Solid
● ● ● ● ● ●
● ● ● ● ● ●
● ● ● ● ● ●
● ● ● ● ● ●
● ● ● ● ● ●
Particles should be closely packed.
Liquid
Particles should have some space and be able to move.
Gas
Particles should be widely separated.
2. Arrange the following in increasing order of interparticle spacing:
Gas, solid, liquid
3. Arrange the following in decreasing order of interparticle attraction:
Liquid, gas, solid
Section I – Case-Based Questions
Read the situation and answer the questions.
Riya filled three containers with ice, water and air. She noticed that ice kept its shape, water took the shape of the container, while air spread throughout the container.
1. Which state of matter is represented by ice?
2. Why does water take the shape of the container?
3. Why does air spread throughout the container?
4. Which sample has the greatest interparticle spacing?
Section J – HOTS Questions
1. A bottle is filled completely with water and closed tightly. Can we easily compress the water by pressing the bottle? Why?
2. Two identical glasses contain equal amounts of water. One is kept in sunlight and the other in a cool room. Which glass is likely to lose water faster? Give a reason.
3. If the attraction between particles of a substance becomes very weak, what change in its state may occur?
4. Why can we pour water but cannot pour an iron block?
Section K – Quick Revision Challenge
Complete the table.
| Property | Solid | Liquid | Gas |
|---|---|---|---|
| Shape | |||
| Volume | |||
| Interparticle spacing | |||
| Interparticle attraction | |||
| Movement of particles |
Answer Key
| Section | Answers |
|---|---|
| Section A |
1. (b) 2. (c) 3. (c) 4. (c) 5. (b) 6. (b) 7. (a) 8. (b) |
| Section B |
1. particles 2. attraction 3. solid 4. liquid 5. gas 6. evaporation 7. spaces 8. melting |
| Section C |
1. True 2. False 3. True 4. True 5. False 6. True 7. False 8. True |
| Section D |
1 – c 2 – d 3 – a 4 – b 5 – e |
| Section E |
1. Matter is anything that has mass and occupies space. 2. Constituent particles are the tiny particles that make up matter. 3. Solid, liquid and gas. 4. Solid. 5. Gas. 6. Melting is the change of a solid into a liquid on heating. 7. Evaporation is the change of a liquid into vapour from its surface. 8. Liquid particles can move past one another. |
| Section G – Key Ideas | Heating gives particles more energy and increases their movement. Diffusion happens because particles are continuously moving. Gases spread because their particles move freely and have large spaces between them. Solids also have interparticle spaces, but they are very small. |
| Section H |
2. Solid → Liquid → Gas 3. Solid → Liquid → Gas |
| Section I |
1. Solid 2. Liquid particles can move past one another. 3. Gas particles move freely throughout the available space. 4. Air |
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