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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 solid carbon dioxide, temperature scales, particle spacing, molecular attraction, and physical 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 exists in different states because particles have different amounts of energy and different intermolecular attractions. By studying these properties, students can understand physical changes, temperature scales, and the behavior of substances in everyday life.
What You Will Learn
✔ Dry ice and sublimation
✔ Kelvin temperature scale
✔ Interparticle spaces
✔ Physical changes in matter
✔ Molecular attraction
✔ NCERT-based concepts
✔ Everyday science applications
Why This Topic Is Important?
Understanding temperature scales, particle arrangement, and physical changes helps students build a strong foundation for future chemistry topics. These concepts are frequently tested in examinations.
1. MCQ Questions with Detailed Solutions
Q1. Which substance is commonly known as Dry Ice?
A) Frozen Water
B) Solid Oxygen
C) Solid Carbon Dioxide
D) Solid Nitrogen
Answer
C) Solid Carbon Dioxide
Concept Behind This Question
Dry ice is the solid form of carbon dioxide.
Step-by-Step Solution
- Carbon dioxide can exist in solid form.
- This solid form is called dry ice.
- It directly changes into gas through sublimation.
Therefore, the correct answer is:
Solid Carbon Dioxide
Exam Tip
Dry ice does not melt into liquid under normal atmospheric conditions.
Q2. What is the Kelvin equivalent of 0°C?
A) 100 K
B) 273 K
C) 300 K
D) 373 K
Answer
B) 273 K
Concept Behind This Question
Kelvin temperature is obtained by adding 273 to Celsius temperature.
Step-by-Step Solution
Formula:
K = °C + 273
0 + 273 = 273 K
Therefore, the correct answer is:
273 K
Exam Tip
Remember the conversion formula: K = °C + 273.
Q3. In which state of matter are interparticle spaces minimum?
A) Gas
B) Liquid
C) Solid
D) Plasma
Answer
C) Solid
Concept Behind This Question
Solid particles are packed very closely.
Step-by-Step Solution
- Solids have tightly packed particles.
- Very little empty space exists between them.
- Therefore, interparticle spaces are minimum.
Exam Tip
Minimum space means maximum density in most cases.
Q4. Which of the following is a physical change?
A) Rusting of Iron
B) Burning of Paper
C) Digestion of Food
D) Melting of Wax
Answer
D) Melting of Wax
Concept Behind This Question
Physical changes do not produce new substances.
Step-by-Step Solution
- Wax changes from solid to liquid.
- No new substance is formed.
- Therefore, it is a physical change.
Exam Tip
Most changes of state are physical changes.
Q5. Why do solids retain their shape?
A) Their particles have no mass
B) Their particles are motionless
C) Strong attraction holds particles in fixed positions
D) Solids contain no intermolecular force
Answer
C) Strong attraction holds particles in fixed positions
Concept Behind This Question
Strong intermolecular attraction provides rigidity.
Step-by-Step Solution
- Solid particles are closely packed.
- Strong attractive forces keep them fixed.
- Hence solids maintain a definite shape.
Exam Tip
Rigidity is a result of strong intermolecular attraction.
Important Formulas & Concepts
1. Kelvin Conversion
K = °C + 273
2. Dry Ice
Solid carbon dioxide (CO₂).
3. Interparticle Space
The empty space present between particles of matter.
4. Physical Change
A change in which no new substance is formed.
5. Rigidity
The property of retaining a fixed shape.
Related Practice Questions
- What is dry ice?
- Convert 10°C into Kelvin.
- Which state has minimum interparticle space?
- Define a physical change.
- Why are solids rigid?
Mini Quiz Challenge
Fill in the blanks
- Dry ice is solid __________.
- 0°C equals __________ K.
- Solids have minimum __________ space.
Answers
- Carbon Dioxide
- 273
- Interparticle
Exam Tips
✔ Learn Celsius-Kelvin conversions.
✔ Revise examples of physical changes.
✔ Understand properties of solids.
✔ Remember common NCERT examples.
✔ Practice conceptual questions regularly.
Quick Revision Notes
✔ Dry ice is solid carbon dioxide.
✔ 0°C = 273 K.
✔ Solids have minimum interparticle spaces.
✔ Melting of wax is a physical change.
✔ Solids retain shape due to strong attraction.
✔ Changes of state are physical changes.
✔ Kelvin scale is widely used in science.
Common Mistakes Students Make
❌ Confusing dry ice with ordinary ice.
❌ Forgetting to add 273 during conversion.
❌ Mixing physical and chemical changes.
❌ Assuming solid particles do not move.
❌ Ignoring intermolecular attraction.
Key Takeaways
✔ Dry ice is solid carbon dioxide.
✔ Kelvin scale is related to Celsius scale.
✔ Solids have minimum interparticle spaces.
✔ Physical changes do not create new substances.
✔ Strong attraction makes solids rigid.
✔ Understanding particle arrangement helps explain matter.
FAQs
1. What is dry ice?
Solid carbon dioxide.
2. What is 0°C in Kelvin?
273 K.
3. Which state has minimum interparticle spaces?
Solid state.
4. Is melting of wax a physical change?
Yes, because no new substance is formed.
5. Why do solids maintain their shape?
Due to strong attraction between particles.
Conclusion
The properties of matter are determined by the arrangement and attraction of particles. Concepts such as dry ice, Kelvin scale, interparticle spaces, and physical changes help students understand the behavior of matter and prepare effectively for examinations.
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