Class 9 Science Chapter 1 Matter in Our Surroundings

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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 kinetic energy, boiling point, condensation, particle attraction, and states of matter 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 exists in different forms and continuously undergoes changes under various conditions. The study of matter helps us understand many common phenomena such as boiling water, condensation of water vapour, and the movement of particles in different states.

What You Will Learn

✔ Kinetic energy of particles

✔ Boiling point of substances

✔ Condensation process

✔ Force of attraction between particles

✔ Properties of solids, liquids, and gases

✔ NCERT-based concepts

✔ Everyday applications of matter

Why This Topic Is Important?

This chapter introduces the fundamental concepts of matter and particle behavior. A clear understanding of these topics helps students perform well in school exams, Olympiads, and future chemistry chapters.

1. MCQ Questions with Detailed Solutions

Q1. The kinetic energy of particles increases when:

A) Temperature decreases

B) Temperature increases

C) Pressure decreases

D) Volume decreases

Answer

B) Temperature increases

Concept Behind This Question

Temperature is directly related to the kinetic energy of particles.

Step-by-Step Solution

• Particles are always moving.
• As temperature increases, particles move faster.
• Faster movement means greater kinetic energy.

Therefore, the correct answer is:

Temperature increases

Exam Tip

Higher temperature means faster particle movement.

Q2. What is the boiling point of water at normal atmospheric pressure?

A) 0°C

B) 50°C

C) 100°C

D) 150°C

Answer

C) 100°C

Concept Behind This Question

Boiling point is the temperature at which a liquid changes into vapour.

Step-by-Step Solution

• Water boils at 100°C under normal atmospheric pressure.
• At this temperature, water changes into steam.

Therefore, the correct answer is:

100°C

Exam Tip

Remember: Water freezes at 0°C and boils at 100°C.

Q3. The conversion of gas into liquid is called:

A) Sublimation

B) Evaporation

C) Condensation

D) Melting

Answer

C) Condensation

Concept Behind This Question

Cooling of gas results in the formation of liquid.

Step-by-Step Solution

• Water vapour cools down.
• It changes into liquid water droplets.
• This process is known as condensation.

Exam Tip

Water droplets on the outside of a cold glass form due to condensation.

Q4. In which state of matter is the force of attraction between particles the strongest?

A) Gas

B) Liquid

C) Solid

D) Plasma

Answer

C) Solid

Concept Behind This Question

Particles in solids are closely packed together.

Step-by-Step Solution

• Solids have minimum intermolecular space.
• Their particles are tightly packed.
• Therefore, attraction between particles is strongest.

Exam Tip

Strong attraction gives solids a definite shape and volume.

Q5. Which of the following can flow easily?

A) Stone

B) Wood

C) Liquid

D) Iron rod

Answer

C) Liquid

Concept Behind This Question

Liquids have particles that can move past one another.

Step-by-Step Solution

• Liquid particles are less tightly packed than solids.
• They can slide over one another.
• Therefore, liquids can flow easily.

Exam Tip

Both liquids and gases are called fluids because they can flow.

Important Formulas & Concepts

1. Kinetic Energy

The energy possessed by particles due to their motion.

2. Boiling Point

The temperature at which a liquid changes into vapour throughout the liquid.

Example:

Water boils at 100°C.

3. Condensation

The process of converting gas into liquid.

4. Force of Attraction

The force that holds particles together.

5. Fluid

A substance that can flow, such as liquids and gases.

Related Practice Questions

1. What happens to particle movement when temperature increases?
2. Define boiling point.
3. What is condensation?
4. Why do solids have a definite shape?
5. What are fluids?

Mini Quiz Challenge

Fill in the blanks

1. Water boils at __________ °C.
2. Conversion of gas into liquid is called __________.
3. Solids have the __________ force of attraction.

Answers

1. 100
2. Condensation
3. Strongest

Exam Tips

✔ Learn the properties of all states of matter.

✔ Remember important temperatures of water.

✔ Understand condensation and evaporation clearly.

✔ Revise particle theory regularly.

✔ Use real-life examples for better understanding.

Quick Revision Notes

✔ Temperature increases kinetic energy.

✔ Water boils at 100°C.

✔ Condensation converts gas into liquid.

✔ Solids have the strongest force of attraction.

✔ Liquids can flow easily.

✔ Liquids and gases are called fluids.

✔ Particle motion never stops.

Common Mistakes Students Make

❌ Confusing condensation with evaporation.

❌ Forgetting the boiling point of water.

❌ Assuming solids can flow like liquids.

❌ Mixing force of attraction in solids and gases.

❌ Confusing kinetic energy with heat.

Key Takeaways

✔ Higher temperature increases particle motion.

✔ Water boils at 100°C under normal conditions.

✔ Condensation changes gas into liquid.

✔ Solids have the strongest intermolecular attraction.

✔ Liquids can flow because their particles move freely.

✔ Understanding particle behavior is essential for chemistry.

FAQs

1. What is kinetic energy?

The energy possessed by a particle due to its motion.

2. What is the boiling point of water?

100°C at normal atmospheric pressure.

3. What is condensation?

The process of changing gas into liquid.

4. Which state has the strongest force of attraction?

Solid state.

5. Why are liquids called fluids?

Because they can flow from one place to another.

Conclusion

The properties of matter are determined by the behavior of its particles. Concepts such as kinetic energy, boiling point, condensation, and force of attraction help explain many natural and everyday processes. A strong understanding of these topics is important for future science learning.

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