Matter in Our Surroundings (Class 9 Science)
Matter is anything that has mass and occupies space, existing in three states: solid, liquid, and gas. Understanding the properties of matter and changes i
TL;DR: Matter is anything that has mass and occupies space, existing in three states: solid, liquid, and gas. Understanding the properties of matter and chan…
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Matter is anything that has mass and occupies space, existing in three states: solid, liquid, and gas. Understanding the properties of matter and changes i
Matter in Our Surroundings MCQs with Answers & Explanations
Q1. Which of the following is a property of solids?
- Definite shape and volume ✓ (correct)
- No definite shape or volume
- Takes the shape of container
- No intermolecular forces
Explanation: Solids have a definite shape and volume due to strong intermolecular forces and arranged particles.
Q2. The change of state from liquid to gas is called:
- Condensation
- Evaporation ✓ (correct)
- Freezing
- Melting
Explanation: Evaporation is the process where a liquid changes into gas state at the surface.
Q3. The temperature at which a solid melts into a liquid is:
- Critical point
- Boiling point
- Melting point ✓ (correct)
- Freezing point
Explanation: The melting point is the specific temperature at which a solid turns into a liquid state.
Q4. Sublimation is the process where a substance changes from:
- Gas to solid
- Solid to liquid
- Liquid to gas
- Solid directly to gas ✓ (correct)
Explanation: Sublimation is the direct transition of a substance from solid state to gas state without becoming liquid.
Q5. Which of the following shows the correct order of particles spacing?
- Gas > Liquid > Solid ✓ (correct)
- Solid > Liquid > Gas
- Gas > Solid > Liquid
- All are equal
Explanation: Particles in gas have the maximum space between them, followed by liquid, then solid with minimum space.
Q6. The SI unit of temperature is:
- Rankine
- Kelvin ✓ (correct)
- Fahrenheit
- Celsius
Explanation: Kelvin is the SI unit of temperature, where absolute zero is 0 K or -273.15 degrees Celsius.
Q7. Evaporation occurs at:
- Boiling point only
- Only at room temperature
- Any temperature below boiling point ✓ (correct)
- Only when heated
Explanation: Evaporation can occur at any temperature below the boiling point, not just at boiling point.
Q8. The process of conversion of gas to liquid is:
- Evaporation
- Melting
- Deposition
- Condensation ✓ (correct)
Explanation: Condensation is the change of state from gas to liquid, opposite of evaporation.
Q9. Which state of matter has particles that are closely packed and can vibrate?
- Solid ✓ (correct)
- Plasma
- Liquid
- Gas
Explanation: Solids have closely packed particles that can only vibrate in fixed positions due to strong forces.
Q10. The boiling point of water at standard atmospheric pressure is:
- 90 degrees C
- 100 degrees C ✓ (correct)
- 110 degrees C
- 50 degrees C
Explanation: Water boils at 100 degrees Celsius at standard atmospheric pressure of 1 atm.
Q11. What are the three states of matter?
- Solid, liquid, plasma
- Hot, cold, warm
- Solid, liquid, gas ✓ (correct)
- Visible, invisible, transparent
Explanation: Matter exists in three states: solid (fixed shape and volume), liquid (fixed volume, takes container shape), gas (no fixed shape or volume).
Q12. Which state of matter has a definite shape and definite volume?
- Gas
- Liquid
- Plasma
- Solid ✓ (correct)
Explanation: Solids have definite shape and definite volume due to strong intermolecular forces holding particles in fixed positions.
Q13. What is the process of conversion of solid to liquid called?
- Melting ✓ (correct)
- Condensation
- Sublimation
- Evaporation
Explanation: Melting is the change of state from solid to liquid when temperature increases.
Q14. What is the process of conversion of liquid to gas called?
- Freezing
- Evaporation ✓ (correct)
- Deposition
- Melting
Explanation: Evaporation is the process of conversion of liquid to gas at the surface, which occurs at any temperature.
Q15. What is boiling?
- Freezing of liquid
- Evaporation at surface only
- Rapid evaporation throughout the liquid at fixed temperature ✓ (correct)
- Melting of solid
Explanation: Boiling is rapid evaporation that occurs throughout a liquid at its boiling point, a fixed temperature.
Q16. What is sublimation?
- Liquid to gas
- Gas to liquid
- Solid to liquid
- Solid to gas directly ✓ (correct)
Explanation: Sublimation is direct conversion of solid to gas without passing through liquid state, like dry ice.
Q17. What is the freezing point of water?
- 0 degrees Celsius ✓ (correct)
- -10 degrees Celsius
- 4 degrees Celsius
- 100 degrees Celsius
Explanation: Water freezes at 0 degrees Celsius at standard atmospheric pressure.
Q18. What is the boiling point of water?
- 200 degrees Celsius
- 100 degrees Celsius ✓ (correct)
- 50 degrees Celsius
- 0 degrees Celsius
Explanation: Water boils at 100 degrees Celsius at standard atmospheric pressure.
Q19. What is density?
- Area of object
- Volume of object
- Mass per unit volume ✓ (correct)
- Weight of object
Explanation: Density is the mass per unit volume, expressed as d = m/v.
Q20. Why does ice float on water?
- Water pushes ice up
- Ice takes less space
- Ice is lighter
- Ice has lower density than water ✓ (correct)
Explanation: Ice has lower density than liquid water (ice expands when water freezes), so it floats.
Frequently Asked Questions
Why do different substances have different melting and boiling points?
Different substances have different strengths of intermolecular forces, which determines the temperature needed to change states.
What causes evaporation even below the boiling point?
High-energy particles at the surface of a liquid gain enough energy to escape as gas molecules at room temperature.
More Class 9 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
🤖 Stuck on any of these? Ask Syllab's free AI Tutor to explain step by step →