Welcome To My School Study
Practice Class 9 Science Chapter 1 Matter in Our Surroundings MCQ Questions with Answers based on the latest NCERT syllabus. Solve important conceptual MCQs on particle attraction, diffusion, evaporation, state changes, and everyday applications with detailed solutions for CBSE, State Board, Olympiad, and scholarship exams.
Do You Know
Chapter Information
Subject: Science
Class: 9
Chapter: Matter in Our Surroundings
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Moderate
Based On: NCERT Latest Syllabus (2026)
Introduction
Matter is made up of tiny particles that are constantly moving and interacting with one another. These particles determine the physical properties of substances and explain various natural phenomena observed in daily life.
What You Will Learn
✔ Attraction between particles
✔ Particle movement
✔ Applications of evaporation
✔ Change of state
✔ Real-life examples of matter
✔ NCERT-based concepts
✔ Conceptual understanding
Why This Topic Is Important?
Understanding the behavior of particles helps students explain many daily observations scientifically. These concepts frequently appear in school exams, Olympiads, and scholarship examinations.
1. MCQ Questions with Detailed Solutions
Q1. A sponge can be compressed because:
A) Sponge particles are soft
B) Sponge contains tiny air-filled pores
C) Sponge is a liquid
D) Sponge has no particles
Answer
B) Sponge contains tiny air-filled pores
Concept Behind This Question
Matter contains spaces between particles.
Step-by-Step Solution
- Sponge has numerous tiny pores.
- These pores contain air.
- When pressed, air escapes and the sponge compresses.
Therefore, the correct answer is:
Sponge contains tiny air-filled pores
Exam Tip
This NCERT example demonstrates the presence of spaces between particles.
Q2. Which of the following substances shows the slowest diffusion?
A) Perfume in air
B) Ink in water
C) Copper particles in a metal block
D) Smoke in air
Answer
C) Copper particles in a metal block
Concept Behind This Question
Diffusion occurs slowest in solids.
Step-by-Step Solution
- Solid particles are tightly packed.
- Their movement is extremely limited.
- Therefore, diffusion is slowest in solids.
Exam Tip
Diffusion speed: Gas > Liquid > Solid.
Q3. Why do earthen pots keep water cool during summer?
A) They absorb sunlight
B) Water evaporates through tiny pores
C) Clay increases water temperature
D) Earthen pots produce cold air
Answer
B) Water evaporates through tiny pores
Concept Behind This Question
Evaporation causes cooling.
Step-by-Step Solution
- Earthen pots contain microscopic pores.
- Water slowly evaporates through these pores.
- Evaporation absorbs heat and cools the water.
Exam Tip
This is a classic NCERT example of evaporative cooling.
Q4. Which change of state occurs when naphthalene balls gradually disappear?
A) Melting
B) Freezing
C) Condensation
D) Sublimation
Answer
D) Sublimation
Concept Behind This Question
Some solids directly convert into gases.
Step-by-Step Solution
- Naphthalene changes directly from solid to vapour.
- No liquid state is formed.
- This process is called sublimation.
Exam Tip
Camphor and dry ice are also examples of sublimation.
Q5. Why does a gas exert pressure in all directions?
A) Gas particles have colour
B) Gas particles are motionless
C) Gas particles move randomly in all directions
D) Gas particles stick together
Answer
C) Gas particles move randomly in all directions
Concept Behind This Question
Pressure results from collisions of moving particles.
Step-by-Step Solution
- Gas particles move continuously.
- They collide with container walls from every direction.
- Hence pressure is exerted in all directions.
Exam Tip
Gas pressure increases when particle collisions increase.
Important Formulas & Concepts
1. Diffusion Rate
Gas > Liquid > Solid
2. Evaporative Cooling
Evaporation absorbs heat from surroundings.
3. Sublimation
Direct conversion of solid into gas.
4. Gas Pressure
Caused by collisions of gas particles.
5. Interparticle Space
Space present between particles of matter.
Related Practice Questions
- Why can a sponge be compressed?
- Which state shows the fastest diffusion?
- How do earthen pots cool water?
- What is sublimation?
- Why do gases exert pressure?
Mini Quiz Challenge
Fill in the blanks
- Diffusion is slowest in __________.
- Earthen pots cool water due to __________.
- Naphthalene balls disappear by __________.
Answers
- Solids
- Evaporation
- Sublimation
Exam Tips
✔ Revise NCERT daily-life examples.
✔ Learn diffusion order carefully.
✔ Remember common sublimation substances.
✔ Understand gas pressure concepts.
✔ Focus on conceptual questions.
Quick Revision Notes
✔ Sponge contains air-filled pores.
✔ Diffusion is slowest in solids.
✔ Earthen pots cool water through evaporation.
✔ Naphthalene undergoes sublimation.
✔ Gas particles move randomly.
✔ Gas pressure acts in all directions.
✔ Matter contains spaces between particles.
Common Mistakes Students Make
❌ Thinking sponge has no particles.
❌ Confusing sublimation with melting.
❌ Forgetting that diffusion occurs in solids.
❌ Assuming gases exert pressure only downward.
❌ Ignoring evaporative cooling examples.
Key Takeaways
✔ Matter contains spaces between particles.
✔ Diffusion occurs in all states of matter.
✔ Evaporation produces cooling.
✔ Sublimation is a direct solid-to-gas change.
✔ Gas pressure results from particle collisions.
✔ Everyday observations support particle theory.
FAQs
1. Why can a sponge be compressed?
Because it contains tiny air-filled pores.
2. Which state shows the slowest diffusion?
Solid state.
3. Why does water remain cool in an earthen pot?
Due to evaporation through tiny pores.
4. What is sublimation?
Direct conversion of a solid into gas.
5. Why do gases exert pressure?
Because their particles continuously collide with container walls.
Conclusion
The behavior of particles explains many everyday phenomena such as cooling in earthen pots, compression of sponges, and the disappearance of naphthalene balls. Understanding these concepts helps students develop a strong foundation in chemistry and scientific reasoning.
Related Links
- Class 9 Maths Chapter 3 Coordinate Geometry part-8
- Class 9 Social Science Chapter 1: The French Revolution part-9
- Class 9 Science Chapter 1 Matter in Our Surroundings part-8
- Class 9 English Chapter 1 The Fun They Had part-3
- Class 9 Maths Chapter 3 Coordinate Geometry part-7
- Class 9 Social Science Chapter 1: The French Revolution part-8
- Class 9 Science Chapter 1 Matter in Our Surroundings part-7
- Class 9 Maths Chapter 3 Coordinate Geometry part-6
- Class 9 Social Science Chapter 1: The French Revolution part-5
- Class 9 Maths Chapter 3 Coordinate Geometry part-5
- Class 9 Science Chapter 1 Matter in Our Surroundings part-6
- Class 9 English Chapter 1 The Fun They Had part-2
Latest Posts
- Class 9 Maths Chapter 4 Linear Equations in Two Variables
- Class 7 Maths Chapter 4 Simple Equations
- Class 8 Maths Chapter 4 Practical Geometry
- Class 10 Maths Chapter 4 Quadratic Equations
- Class 9 Science Chapter 1 Matter in Our Surroundings
Join Our Other Communities
Instagram , Youtube , Facebook
