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Practice Class 9 Science Chapter 1 Matter in Our Surroundings MCQ Questions with Answers based on the latest NCERT syllabus. Solve important MCQs on particles of matter, diffusion, compressibility, evaporation, and change of state with detailed solutions for CBSE, State Board, Olympiad, and scholarship exams.
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Chapter Information
Subject: Science
Class: 9
Chapter: Matter in Our Surroundings
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: NCERT Latest Syllabus (2026)
Introduction
Matter is present everywhere around us. The air we breathe, the water we drink, and the objects we use daily are all forms of matter. Understanding the properties of matter helps students explain many natural and everyday phenomena.
What You Will Learn
✔ Characteristics of particles of matter
✔ Diffusion in daily life
✔ Compressibility of gases
✔ Change of state
✔ Evaporation and cooling effect
✔ NCERT-based concepts
✔ Real-life applications of matter
Why This Topic Is Important?
Matter in Our Surroundings is the first chapter of Class 9 Science and forms the foundation for many chemistry concepts. Questions from this chapter are commonly asked in school exams, Olympiads, scholarship tests, and competitive examinations.
1. MCQ Questions with Detailed Solutions
Q1. Which of the following shows that particles of matter are continuously moving?
A) Melting of ice
B) Smell of perfume spreading in a room
C) Rusting of iron
D) Burning of paper
Answer
B) Smell of perfume spreading in a room
Concept Behind This Question
Particles of matter move continuously and mix with other particles.
Step-by-Step Solution
- Perfume particles move through air.
- They spread throughout the room on their own.
- This demonstrates the continuous movement of particles.
Therefore, the correct answer is:
Smell of perfume spreading in a room
Exam Tip
The spreading of fragrance is a common example of diffusion.
Q2. Which state of matter can be compressed most easily?
A) Solid
B) Liquid
C) Gas
D) All equally
Answer
C) Gas
Concept Behind This Question
The large spaces between gas particles make compression possible.
Step-by-Step Solution
- Solids have tightly packed particles.
- Liquids have little free space.
- Gases have very large intermolecular spaces.
- Therefore, gases can be compressed easily.
Exam Tip
LPG cylinders work because gases can be compressed.
Q3. What happens to the rate of evaporation when temperature increases?
A) It decreases
B) It remains unchanged
C) It increases
D) It becomes zero
Answer
C) It increases
Concept Behind This Question
Higher temperature gives more kinetic energy to particles.
Step-by-Step Solution
- Temperature increases particle energy.
- More particles escape from the liquid surface.
- Therefore, evaporation becomes faster.
Exam Tip
Wet clothes dry faster on hot sunny days.
Q4. The process of converting a solid directly into gas is called:
A) Condensation
B) Sublimation
C) Freezing
D) Melting
Answer
B) Sublimation
Concept Behind This Question
Some substances change directly from solid to gas.
Step-by-Step Solution
- Camphor and naphthalene are common examples.
- They change directly into vapour without becoming liquid.
- This process is called sublimation.
Exam Tip
Remember: Solid → Gas directly = Sublimation.
Q5. Which of the following is NOT a characteristic of particles of matter?
A) They have spaces between them
B) They are continuously moving
C) They attract each other
D) They are completely stationary
Answer
D) They are completely stationary
Concept Behind This Question
Particles of matter are always in motion.
Step-by-Step Solution
- Matter particles possess kinetic energy.
- They continuously move and interact.
- Therefore, they cannot be completely stationary.
Exam Tip
Motion of particles increases with temperature.
Important Formulas & Concepts
1. Diffusion
The spontaneous mixing of particles of two substances.
2. Compressibility
The ability of a substance to decrease its volume under pressure.
3. Evaporation
Conversion of liquid into vapour from its surface at any temperature.
4. Sublimation
Direct conversion of a solid into gas without passing through the liquid state.
5. Characteristics of Particles of Matter
• Have spaces between them
• Are continuously moving
• Attract one another
Related Practice Questions
- What is diffusion?
- Why are gases highly compressible?
- Define sublimation.
- Which factors affect evaporation?
- Why do particles of matter move continuously?
Mini Quiz Challenge
Fill in the blanks
- Particles of matter are __________ moving.
- Gas particles have large __________ between them.
- Solid changing directly into gas is called __________.
Answers
- Continuously
- Spaces
- Sublimation
Exam Tips
✔ Learn the characteristics of particles of matter.
✔ Revise examples of diffusion and sublimation.
✔ Understand factors affecting evaporation.
✔ Relate concepts with everyday examples.
✔ Practice NCERT in-text and exercise questions.
Quick Revision Notes
✔ Matter is made up of tiny particles.
✔ Particles are continuously moving.
✔ Gases are highly compressible.
✔ Diffusion occurs in solids, liquids, and gases.
✔ Evaporation increases with temperature.
✔ Sublimation is a direct solid-to-gas change.
✔ Particles attract each other.
Common Mistakes Students Make
❌ Confusing evaporation with boiling.
❌ Forgetting that particles are always moving.
❌ Mixing sublimation with melting.
❌ Assuming gases cannot be compressed.
❌ Ignoring intermolecular spaces.
Key Takeaways
✔ Matter consists of tiny particles.
✔ Particles have spaces between them.
✔ Gases are highly compressible.
✔ Diffusion occurs because particles move continuously.
✔ Evaporation increases with temperature.
✔ Sublimation is a direct change from solid to gas.
FAQs
1. What is diffusion?
The spontaneous mixing of particles of different substances.
2. Which state of matter is most compressible?
Gases are the most compressible state of matter.
3. What is sublimation?
The direct conversion of a solid into gas.
4. Why does evaporation increase with temperature?
Because particles gain more kinetic energy.
5. Do particles of matter remain stationary?
No, particles of matter are always moving.
Conclusion
Matter is made up of tiny particles that are continuously moving and interacting with one another. Understanding diffusion, evaporation, compressibility, and sublimation helps students build a strong foundation for future chemistry concepts and examinations.
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