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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 particle attraction, change of state, temperature effects, solids, liquids, and gases 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: Moderate
Based On: NCERT Latest Syllabus (2026)
Introduction
The physical state of a substance depends on temperature, pressure, and the force of attraction between its particles. Understanding these concepts helps explain why substances behave differently in solid, liquid, and gaseous forms.
What You Will Learn
✔ Force of attraction between particles
✔ Effect of temperature on matter
✔ Properties of solids, liquids, and gases
✔ State changes
✔ Practical applications of matter
✔ NCERT-based concepts
✔ Conceptual reasoning
Why This Topic Is Important?
This chapter forms the basis of chemistry and helps students understand the behavior of matter. Questions from these concepts are frequently asked in school examinations and competitive tests.
1. MCQ Questions with Detailed Solutions
Q1. Which of the following substances has the least force of attraction between its particles?
A) Ice
B) Water
C) Water Vapour
D) Iron
Answer
C) Water Vapour
Concept Behind This Question
Gas particles are far apart and have the weakest attractive forces.
Step-by-Step Solution
- Ice and iron are solids with strong attraction.
- Water is a liquid with moderate attraction.
- Water vapour is a gas with very weak attraction.
Therefore, the correct answer is:
Water Vapour
Exam Tip
The force of attraction decreases from solid → liquid → gas.
Q2. What happens to the kinetic energy of particles when a substance is heated?
A) It decreases
B) It becomes zero
C) It increases
D) It remains unchanged
Answer
C) It increases
Concept Behind This Question
Heating provides energy to particles.
Step-by-Step Solution
- Heat increases particle motion.
- Faster-moving particles possess more kinetic energy.
- Therefore, kinetic energy increases.
Exam Tip
Higher temperature means higher kinetic energy.
Q3. Which state of matter can flow and also diffuse faster than liquids?
A) Solid
B) Gas
C) Crystal
D) Ice
Answer
B) Gas
Concept Behind This Question
Gas particles move freely and rapidly.
Step-by-Step Solution
- Gases can flow easily.
- Their particles move randomly at high speed.
- Hence diffusion is much faster than in liquids.
Exam Tip
Diffusion is fastest in gases.
Q4. During melting, the temperature of a pure substance:
A) Increases continuously
B) Decreases continuously
C) Remains constant until melting is complete
D) Becomes zero
Answer
C) Remains constant until melting is complete
Concept Behind This Question
Heat supplied during melting is used for changing the state.
Step-by-Step Solution
- Melting requires latent heat of fusion.
- This energy breaks intermolecular forces.
- Therefore, temperature remains constant until melting is complete.
Exam Tip
Temperature does not rise during a phase change.
Q5. Which of the following is an example of matter?
A) Heat
B) Sound
C) Air
D) Light
Answer
C) Air
Concept Behind This Question
Matter has mass and occupies space.
Step-by-Step Solution
- Air occupies space.
- Air has mass.
- Therefore, air is matter.
Heat, sound, and light are forms of energy.
Exam Tip
Anything that has mass and occupies space is matter.
Important Formulas & Concepts
1. Matter
Anything that has mass and occupies space.
2. Kinetic Energy
Energy possessed by particles due to motion.
3. Melting
Conversion of solid into liquid on heating.
4. Latent Heat of Fusion
Heat absorbed during melting without temperature change.
5. Force of Attraction
The force that holds particles together.
Related Practice Questions
- Which state has the weakest force of attraction?
- What happens to particle motion during heating?
- Why do gases diffuse rapidly?
- What happens to temperature during melting?
- Define matter.
Mini Quiz Challenge
Fill in the blanks
- Air is a form of __________.
- Heating increases __________ energy.
- During melting, temperature remains __________.
Answers
- Matter
- Kinetic
- Constant
Exam Tips
✔ Learn the definition of matter thoroughly.
✔ Revise the effect of temperature on particles.
✔ Understand latent heat concepts.
✔ Compare solids, liquids, and gases.
✔ Focus on NCERT examples and activities.
Quick Revision Notes
✔ Matter has mass and occupies space.
✔ Water vapour has the weakest intermolecular attraction.
✔ Heating increases kinetic energy.
✔ Gases diffuse rapidly.
✔ Temperature remains constant during melting.
✔ Air is matter.
✔ Phase changes require energy.
Common Mistakes Students Make
❌ Considering heat and light as matter.
❌ Forgetting that temperature remains constant during melting.
❌ Confusing kinetic energy with heat energy.
❌ Mixing diffusion and evaporation.
❌ Assuming gases have strong intermolecular forces.
Key Takeaways
✔ Matter occupies space and has mass.
✔ Gas particles have the weakest attraction.
✔ Heating increases particle motion.
✔ Melting occurs at constant temperature.
✔ Diffusion is fastest in gases.
✔ Understanding particle behavior explains physical changes.
FAQs
1. What is matter?
Anything that has mass and occupies space.
2. Which state has the weakest force of attraction?
The gaseous state.
3. What happens to kinetic energy during heating?
It increases.
4. Why does temperature remain constant during melting?
Because heat is used to change the state.
5. Is air matter?
Yes, air has mass and occupies space.
Conclusion
Matter exists in different forms and exhibits different properties depending on the arrangement and motion of its particles. Understanding kinetic energy, melting, diffusion, and intermolecular forces helps students build a strong scientific foundation.
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