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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 motion, rigidity, fluidity, shape, and volume 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
Based On: NCERT Latest Syllabus (2026)
Introduction
The physical properties of matter depend on how its particles are arranged and how strongly they attract one another. Concepts such as rigidity, fluidity, shape, and volume help us distinguish between solids, liquids, and gases.
What You Will Learn
✔ Rigidity of solids
✔ Fluidity of liquids and gases
✔ Shape and volume of matter
✔ Particle arrangement
✔ Properties of different states
✔ NCERT-based concepts
✔ Real-life applications
Why This Topic Is Important?
Questions based on properties of solids, liquids, and gases are frequently asked in school examinations and competitive tests. Understanding these concepts helps students build a strong foundation for future chemistry chapters.
1. MCQ Questions with Detailed Solutions
Q1. Which property is most characteristic of solids?
A) Fluidity
B) Compressibility
C) Rigidity
D) Diffusion
Answer
C) Rigidity
Concept Behind This Question
Solids maintain their shape because of strong intermolecular forces.
Step-by-Step Solution
- Particles in solids are tightly packed.
- They cannot move freely.
- Therefore, solids are rigid.
Exam Tip
Rigidity is a defining property of solids.
Q2. Which state of matter has no definite shape but has a definite volume?
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer
B) Liquid
Concept Behind This Question
Liquids can flow and take the shape of their container.
Step-by-Step Solution
- Liquids do not have a fixed shape.
- Their volume remains constant.
- Hence liquids fit this description.
Exam Tip
Liquid = Fixed volume + Variable shape.
Q3. Which state of matter shows the highest fluidity?
A) Solid
B) Liquid
C) Gas
D) Solid and Liquid
Answer
C) Gas
Concept Behind This Question
Gas particles move most freely.
Step-by-Step Solution
- Gas particles have very weak intermolecular forces.
- They move rapidly in all directions.
- Therefore, gases show maximum fluidity.
Exam Tip
Greater freedom of movement means greater fluidity.
Q4. Which of the following has neither definite shape nor definite volume?
A) Water
B) Ice
C) Steam
D) Wood
Answer
C) Steam
Concept Behind This Question
Gases do not possess fixed shape or fixed volume.
Step-by-Step Solution
- Steam is water in gaseous form.
- Gases expand to occupy available space.
- Therefore, steam has neither definite shape nor volume.
Exam Tip
Gas = No fixed shape + No fixed volume.
Q5. Why are solids difficult to compress?
A) Their particles move very fast
B) Their particles are very large
C) Their particles are closely packed
D) They contain no particles
Answer
C) Their particles are closely packed
Concept Behind This Question
Very little empty space exists between solid particles.
Step-by-Step Solution
- Solid particles are tightly packed.
- There is almost no free space.
- Therefore, compression is difficult.
Exam Tip
Less intermolecular space means less compressibility.
Important Formulas & Concepts
1. Rigidity
The property by which a substance maintains its shape.
2. Fluidity
The ability of a substance to flow.
3. Compressibility
The ability to reduce volume under pressure.
4. Definite Volume
A fixed amount of space occupied by a substance.
5. Definite Shape
A fixed external form of a substance.
Related Practice Questions
- Why are solids rigid?
- Which states of matter can flow?
- Why are gases highly fluid?
- Which state has fixed volume but no fixed shape?
- Why are solids difficult to compress?
Mini Quiz Challenge
Fill in the blanks
- Solids are known for their __________.
- Liquids have definite __________.
- Gases have maximum __________.
Answers
- Rigidity
- Volume
- Fluidity
Exam Tips
✔ Compare properties of solids, liquids, and gases.
✔ Learn definitions of rigidity and fluidity.
✔ Understand the role of particle arrangement.
✔ Revise compressibility concepts.
✔ Focus on NCERT examples.
Quick Revision Notes
✔ Solids are rigid.
✔ Liquids have fixed volume but no fixed shape.
✔ Gases show maximum fluidity.
✔ Steam is a gas.
✔ Solids are difficult to compress.
✔ Particle arrangement determines physical properties.
✔ Gases occupy the entire available space.
Common Mistakes Students Make
❌ Confusing fluidity with diffusion.
❌ Assuming liquids have fixed shape.
❌ Forgetting that gases have no fixed volume.
❌ Mixing rigidity and hardness.
❌ Ignoring the role of intermolecular spaces.
Key Takeaways
✔ Rigidity is a characteristic property of solids.
✔ Liquids have definite volume but variable shape.
✔ Gases possess maximum fluidity.
✔ Steam has neither fixed shape nor fixed volume.
✔ Closely packed particles make solids difficult to compress.
✔ Physical properties depend on particle arrangement.
FAQs
1. What is rigidity?
The property of maintaining a fixed shape.
2. Which state has definite volume but no definite shape?
Liquid state.
3. Which state has maximum fluidity?
Gaseous state.
4. Why are solids difficult to compress?
Because their particles are closely packed.
5. Does steam have a fixed shape?
No, steam has neither fixed shape nor fixed volume.
Conclusion
Rigidity, fluidity, shape, and volume are important properties used to distinguish different states of matter. Understanding these concepts helps students explain the behavior of substances in everyday life and builds a strong chemistry foundation.
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