Matter – Exercise Questions and Answers
Revise solids, liquids, gases, atoms, molecules, elements and compounds through interactive questions with instant answers.
How to use: Read each question, think of your answer and then tap the question card to check it. Use the search box or category buttons for quicker revision.
Objective Questions
Choose the correct option before revealing the answer.
1 _____ have definite volume. Show answer ⌄
D. Both solids and liquids
Solids and liquids have a definite volume, while gases do not.
2 Which of the following is a liquid at room temperature? Show answer ⌄
D. Mercury
Mercury is a metal that remains liquid at room temperature.
3 Which of the following is not an element? Show answer ⌄
D. Water
Water is a compound made from hydrogen and oxygen. Ferrum is the Latin name for iron.
4 Particles in _____ vibrate at their fixed positions. Show answer ⌄
A. Solids
The particles of a solid are closely packed and vibrate around fixed positions.
5 The intermolecular forces of attraction are strongest in _____. Show answer ⌄
A. Solids
Solid particles are held together by very strong forces of attraction.
Fill in the Blanks
Think of the missing scientific term.
1 _____ is the feel of a material on touching it. Show answer ⌄
Texture
2 The particles in the gaseous state quickly change their _____. Show answer ⌄
Position
3 A liquid takes the _____ of the container in which it is kept. Show answer ⌄
Shape
4 Gases have the _____ intermolecular space between their particles. Show answer ⌄
Largest
5 The smallest particle of a compound that exhibits the same properties as the compound is a _____. Show answer ⌄
Molecule
True or False
Decide whether each statement is correct.
1 A silk sari has a smooth texture. Show answer ⌄
True
2 Elements are made up of the same type of atoms. Show answer ⌄
True
3 Liquids have a definite volume. Show answer ⌄
True
Liquids have a definite volume but do not have a definite shape.
4 Gases have weak forces of attraction between their particles. Show answer ⌄
True
5 Particles are tightly packed in liquids. Show answer ⌄
False
Liquid particles are less tightly packed than solid particles and can move past one another.
Match the Following
Connect each item with its correct description.
1 Match the following: Show answer ⌄
- Metals → Mostly solid
- Water → Exists in three states
- Air → Made up of gases
- Petrol → Liquid
- Atom → Smallest particle of an element
Subjective Questions
Understand the concepts through detailed answers.
1 Compare the properties of solids, liquids and gases. Show answer ⌄
| Property | Solids | Liquids | Gases |
|---|---|---|---|
| Shape | Definite shape | No definite shape | No definite shape |
| Volume | Definite volume | Definite volume | No definite volume |
| Particle arrangement | Very closely packed | Less closely packed | Very far apart |
| Force of attraction | Strongest | Moderate | Weakest |
| Particle movement | Vibrate at fixed positions | Move past one another | Move freely in all directions |
2 Liquids and gases are collectively called fluids. Justify. Show answer ⌄
Liquids and gases can flow from one place to another. Therefore, they are collectively called fluids.
3 Explain atoms and molecules with the help of examples. Show answer ⌄
An atom is the smallest particle of an element that takes part in a chemical reaction. Examples include hydrogen (H), oxygen (O) and carbon (C).
A molecule is formed when two or more atoms join chemically. Examples include water (H₂O), oxygen (O₂) and carbon dioxide (CO₂).
4 Differentiate between elements and compounds. Show answer ⌄
Elements: Elements are pure substances made of only one kind of atom. They cannot be broken into simpler substances through ordinary chemical methods. Examples include oxygen, iron and gold.
Compounds: Compounds are substances formed when two or more elements combine chemically in a fixed proportion. Examples include water, carbon dioxide and common salt.
5 Arrange solid, liquid and gas in the order of: Show answer ⌄
A. Increasing intermolecular forces:
Gas < Liquid < Solid
B. Decreasing intermolecular spaces:
Gas > Liquid > Solid
Exemplar Problems
Apply your knowledge to practical situations.
1 On stretching a spring, it changes its shape. Will you classify the spring as a solid? Why? Show answer ⌄
Yes, a spring is a solid because it has a definite shape and volume. Its change in shape is temporary because it is elastic. It normally returns to its original shape when the stretching force is removed.
2 Why do gases occupy the entire space available to them inside a closed vessel? Show answer ⌄
Gas particles have very weak forces of attraction and move freely in all directions. Therefore, they spread out and occupy all the available space inside the vessel.
3 What conditions are necessary for something to be called matter? Can force be called matter? Show answer ⌄
Anything that has mass and occupies space is called matter.
Force cannot be called matter because it does not have mass and does not occupy space.
4 Water can exist as a solid, liquid or gas. Which state has the lowest density? Why? Show answer ⌄
Water vapour, which is the gaseous state of water, has the lowest density because its molecules are farthest apart.
5 State one property of a liquid that a solid does not possess. Show answer ⌄
A liquid can flow and take the shape of its container, whereas a solid has a fixed shape.
1 Comments
Very nice
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