Matter in Our Surroundings (Class 9 Science)
Matter is everything around us that has mass and volume. Understanding the properties of matter helps us comprehend the physical world.
TL;DR: Matter is everything around us that has mass and volume. Understanding the properties of matter helps us comprehend the physical world.
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Matter is everything around us that has mass and volume. Understanding the properties of matter helps us comprehend the physical world.
Matter in Our Surroundings MCQs with Answers & Explanations
Q1. What are the three states of matter?
- Solid, liquid, gas ✓ (correct)
- Hot, cold, warm
- Visible, invisible, transparent
- Solid, liquid, plasma
Explanation: Matter exists in three states: solid (fixed shape and volume), liquid (fixed volume, takes container shape), gas (no fixed shape or volume).
Q2. Which state of matter has a definite shape and definite volume?
- Plasma
- Solid ✓ (correct)
- Gas
- Liquid
Explanation: Solids have definite shape and definite volume due to strong intermolecular forces holding particles in fixed positions.
Q3. What is the process of conversion of solid to liquid called?
- Sublimation
- Evaporation
- Melting ✓ (correct)
- Condensation
Explanation: Melting is the change of state from solid to liquid when temperature increases.
Q4. What is the process of conversion of liquid to gas called?
- Melting
- Deposition
- Freezing
- Evaporation ✓ (correct)
Explanation: Evaporation is the process of conversion of liquid to gas at the surface, which occurs at any temperature.
Q5. What is boiling?
- Rapid evaporation throughout the liquid at fixed temperature ✓ (correct)
- Melting of solid
- Evaporation at surface only
- Freezing of liquid
Explanation: Boiling is rapid evaporation that occurs throughout a liquid at its boiling point, a fixed temperature.
Q6. What is sublimation?
- Liquid to gas
- Solid to gas directly ✓ (correct)
- Gas to liquid
- Solid to liquid
Explanation: Sublimation is direct conversion of solid to gas without passing through liquid state, like dry ice.
Q7. What is the freezing point of water?
- -10 degrees Celsius
- 4 degrees Celsius
- 0 degrees Celsius ✓ (correct)
- 100 degrees Celsius
Explanation: Water freezes at 0 degrees Celsius at standard atmospheric pressure.
Q8. What is the boiling point of water?
- 0 degrees Celsius
- 50 degrees Celsius
- 200 degrees Celsius
- 100 degrees Celsius ✓ (correct)
Explanation: Water boils at 100 degrees Celsius at standard atmospheric pressure.
Q9. What is density?
- Mass per unit volume ✓ (correct)
- Area of object
- Volume of object
- Weight of object
Explanation: Density is the mass per unit volume, expressed as d = m/v.
Q10. Why does ice float on water?
- Ice takes less space
- Ice has lower density than water ✓ (correct)
- Water pushes ice up
- Ice is lighter
Explanation: Ice has lower density than liquid water (ice expands when water freezes), so it floats.
Frequently Asked Questions
What is the difference between evaporation and boiling?
Evaporation occurs at any temperature at the surface of liquid, while boiling is rapid evaporation throughout the liquid at a specific boiling point temperature.
Why does matter change its state?
Matter changes state due to changes in temperature and pressure. When temperature increases, particles gain kinetic energy and can overcome intermolecular forces, leading to state change.
More Class 9 Science MCQs
- Light Reflection and Refraction
- Electricity
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
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