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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 latent heat, evaporation, temperature, matter particles, and state changes 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
Matter is made up of tiny particles that are continuously moving and interacting with one another. The changes in temperature and pressure affect these particles, leading to changes in the physical state of matter. Understanding these concepts is essential for building a strong foundation in chemistry.
What You Will Learn
✔ Latent heat concepts
✔ Effects of evaporation
✔ Particle behavior
✔ State changes of matter
✔ Temperature and molecular motion
✔ NCERT-based concepts
✔ Everyday applications of matter
Why This Topic Is Important?
This chapter is one of the most important foundations of chemistry. Concepts such as latent heat, evaporation, and particle movement frequently appear in school examinations, Olympiads, and scholarship tests.
1. MCQ Questions with Detailed Solutions
Q1. What is the main reason that sweat cools our body?
A) Sweat increases body temperature
B) Sweat absorbs heat during evaporation
C) Sweat produces cold air
D) Sweat reduces body mass
Answer
B) Sweat absorbs heat during evaporation
Concept Behind This Question
Evaporation causes cooling because energy is required for particles to escape from the liquid surface.
Step-by-Step Solution
- Sweat present on the skin evaporates.
- Evaporation requires heat energy.
- This heat is taken from the body surface.
- As a result, the body feels cool.
Therefore, the correct answer is:
Sweat absorbs heat during evaporation
Exam Tip
Sweating is a natural cooling mechanism of the human body.
Q2. Which of the following conditions increases the rate of evaporation the most?
A) Low temperature and high humidity
B) High temperature and low humidity
C) Low temperature and low wind speed
D) High humidity and low surface area
Answer
B) High temperature and low humidity
Concept Behind This Question
Evaporation becomes faster when particles receive more energy and the surrounding air is dry.
Step-by-Step Solution
- High temperature provides more kinetic energy.
- Low humidity allows more water vapour to escape.
- Therefore, evaporation increases significantly.
Exam Tip
High temperature + low humidity = maximum evaporation.
Q3. The latent heat supplied during melting is mainly used to:
A) Increase temperature
B) Increase mass
C) Overcome attractive forces between particles
D) Change colour
Answer
C) Overcome attractive forces between particles
Concept Behind This Question
Latent heat changes the state of matter without changing temperature.
Step-by-Step Solution
- During melting, particles need to separate.
- Energy is used to weaken intermolecular attractions.
- Hence, temperature remains constant while melting occurs.
Exam Tip
Latent heat breaks particle attractions.
Q4. Which statement correctly describes particles of matter?
A) They are stationary
B) They have no attractive force
C) They continuously move and attract each other
D) They exist only in solids
Answer
C) They continuously move and attract each other
Concept Behind This Question
The particle theory of matter explains the behavior of substances.
Step-by-Step Solution
- Particles are always moving.
- Attractive forces exist between particles.
- These properties explain different states of matter.
Exam Tip
Movement and attraction are fundamental properties of particles.
Q5. Which process represents the conversion of gas directly into liquid?
A) Fusion
B) Vaporisation
C) Condensation
D) Sublimation
Answer
C) Condensation
Concept Behind This Question
Condensation occurs when gas loses heat and changes into liquid.
Step-by-Step Solution
- Water vapour cools down.
- Particles lose kinetic energy.
- Gas changes into liquid.
- This process is called condensation.
Exam Tip
Condensation is the opposite of vaporisation.
Important Formulas & Concepts
1. Evaporation
Conversion of liquid into vapour from the surface at any temperature.
2. Latent Heat
Heat absorbed or released during a change of state without temperature change.
3. Condensation
Conversion of gas into liquid.
4. Particle Theory of Matter
- Matter is made of particles.
- Particles have spaces between them.
- Particles are continuously moving.
- Particles attract each other.
5. Evaporative Cooling
Cooling produced when a liquid evaporates.
Related Practice Questions
- Why does sweating cool the body?
- Which factors affect evaporation?
- What is latent heat?
- What are the characteristics of matter particles?
- What is condensation?
Mini Quiz Challenge
Fill in the blanks
- Sweat cools the body due to __________.
- Latent heat helps overcome __________ forces.
- Gas changes into liquid during __________.
Answers
- Evaporation
- Attractive
- Condensation
Exam Tips
✔ Learn all factors affecting evaporation.
✔ Revise latent heat definitions carefully.
✔ Understand condensation and vaporisation.
✔ Remember the properties of matter particles.
✔ Practice NCERT conceptual questions.
Quick Revision Notes
✔ Sweat cools the body through evaporation.
✔ High temperature increases evaporation.
✔ Latent heat overcomes particle attraction.
✔ Matter particles continuously move.
✔ Particles attract one another.
✔ Condensation converts gas into liquid.
✔ State changes occur due to temperature and pressure changes.
Common Mistakes Students Make
❌ Confusing condensation with evaporation.
❌ Assuming latent heat increases temperature.
❌ Forgetting the role of humidity.
❌ Thinking particles remain stationary.
❌ Mixing melting and condensation processes.
Key Takeaways
✔ Evaporation causes cooling.
✔ Temperature and humidity affect evaporation.
✔ Latent heat changes the state of matter.
✔ Particles are always moving and attracting one another.
✔ Condensation converts gas into liquid.
✔ Understanding particle theory is essential for chemistry.
FAQs
1. Why does sweat cool the body?
Because evaporation absorbs heat from the skin.
2. What is latent heat?
Heat used during a change of state without changing temperature.
3. What is condensation?
The conversion of gas into liquid.
4. Do particles of matter attract one another?
Yes, particles attract one another.
5. Which factors increase evaporation?
High temperature, large surface area, high wind speed, and low humidity.
Conclusion
Matter behaves according to the movement and attraction of its particles. Concepts such as evaporation, latent heat, and condensation help explain many everyday phenomena and provide a strong foundation for future chemistry studies.
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