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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 diffusion, evaporation, latent heat, change of state, and properties 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: Moderate to Difficult
Based On: NCERT Latest Syllabus (2026)
Introduction
Everything around us occupies space and has mass. Air, water, wood, metals, and even the food we eat are forms of matter. Understanding the properties of matter and changes in its state helps students explain many everyday phenomena such as melting ice, drying clothes, and boiling water.
What You Will Learn
✔ Properties of matter
✔ Diffusion in gases and liquids
✔ Evaporation and factors affecting it
✔ Change of state
✔ Latent heat
✔ Temperature and particle movement
✔ NCERT-based concepts
Why This Topic Is Important?
Matter in Our Surroundings is the foundation chapter of Class 9 Science. Questions related to diffusion, evaporation, and states of matter are frequently asked in school examinations, Olympiads, scholarship tests, and competitive examinations.
1. MCQ Questions with Detailed Solutions
Q1. Which state of matter has the maximum intermolecular space?
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer
C) Gas
Concept Behind This Question
Particles in gases are very far apart compared to solids and liquids.
Step-by-Step Solution
- Solids have tightly packed particles.
- Liquids have moderate spacing between particles.
- Gases have particles that are far apart.
- Therefore, gases have the maximum intermolecular space.
Exam Tip
Greater intermolecular space means greater compressibility.
Q2. What is the process by which particles of one substance mix with particles of another substance on their own?
A) Condensation
B) Diffusion
C) Sublimation
D) Melting
Answer
B) Diffusion
Concept Behind This Question
Diffusion occurs due to the continuous movement of particles.
Step-by-Step Solution
- Particles are always moving.
- They mix automatically with particles of another substance.
- This process is known as diffusion.
Exam Tip
Diffusion is fastest in gases and slowest in solids.
Q3. Which factor increases the rate of evaporation?
A) Low temperature
B) High humidity
C) Increased surface area
D) Still air
Answer
C) Increased surface area
Concept Behind This Question
More exposed particles can escape into the atmosphere.
Step-by-Step Solution
- Larger surface area exposes more particles.
- More particles gain energy and evaporate.
- Hence evaporation becomes faster.
Exam Tip
Clothes dry faster when spread out.
Q4. The heat required to change the state of a substance without changing its temperature is called:
A) Specific Heat
B) Thermal Energy
C) Latent Heat
D) Heat Capacity
Answer
C) Latent Heat
Concept Behind This Question
Latent heat changes the state of matter without increasing temperature.
Step-by-Step Solution
- Ice melts at 0°C.
- During melting, temperature remains constant.
- Heat absorbed is used to change state.
- This heat is called latent heat.
Exam Tip
Latent heat works during melting and boiling processes.
Q5. Which process converts a liquid directly into gas from its surface at any temperature?
A) Boiling
B) Evaporation
C) Condensation
D) Freezing
Answer
B) Evaporation
Concept Behind This Question
Evaporation occurs at all temperatures from the surface of a liquid.
Step-by-Step Solution
- Surface particles gain sufficient energy.
- They escape into the atmosphere.
- This process is called evaporation.
Exam Tip
Evaporation causes cooling because energetic particles leave the liquid.
Important Formulas & Concepts
1. Diffusion
Movement of particles from a region of higher concentration to lower concentration.
2. Evaporation
Conversion of liquid into vapour from its surface at any temperature.
3. Latent Heat
Heat absorbed or released during a change of state without temperature change.
4. Melting Point
Temperature at which a solid changes into a liquid.
5. Boiling Point
Temperature at which a liquid changes into vapour throughout the liquid.
Related Practice Questions
- What is diffusion?
- Why do clothes dry faster on windy days?
- Define latent heat.
- What is evaporation?
- Which state of matter is most compressible?
Mini Quiz Challenge
Fill in the blanks
- Diffusion is fastest in _________.
- Evaporation causes _________ effect.
- Heat required to change state is called _________ heat.
Answers
- Gases
- Cooling
- Latent
Exam Tips
✔ Learn properties of all three states of matter.
✔ Understand factors affecting evaporation.
✔ Revise latent heat and change of state.
✔ Practice NCERT examples regularly.
✔ Remember real-life applications.
Quick Revision Notes
✔ Matter is made up of tiny particles.
✔ Gas particles have maximum intermolecular space.
✔ Diffusion is fastest in gases.
✔ Evaporation occurs at all temperatures.
✔ Increased surface area increases evaporation.
✔ Latent heat changes state without changing temperature.
✔ Evaporation produces a cooling effect.
Common Mistakes Students Make
❌ Confusing evaporation with boiling.
❌ Forgetting that evaporation occurs at all temperatures.
❌ Mixing melting point and boiling point.
❌ Ignoring the cooling effect of evaporation.
❌ Confusing diffusion with change of state.
Key Takeaways
✔ Matter consists of tiny moving particles.
✔ Diffusion occurs due to particle movement.
✔ Gases have maximum intermolecular space.
✔ Evaporation takes place from the surface of liquids.
✔ Latent heat helps change the state of matter.
✔ Understanding everyday examples improves exam performance.
FAQs
1. What is matter?
Anything that has mass and occupies space is called matter.
2. What is diffusion?
The spontaneous mixing of particles of different substances.
3. What is evaporation?
The conversion of liquid into vapour from its surface at any temperature.
4. What is latent heat?
Heat required to change the state of a substance without changing temperature.
5. Why does evaporation cause cooling?
Because high-energy particles escape from the liquid surface.
Conclusion
Matter exists in different states and continuously changes from one state to another under suitable conditions. Understanding diffusion, evaporation, and latent heat helps students connect scientific concepts with everyday life and perform well in examinations.
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