Class 9 • Chemistry • Chapter 1
Matter in Our Surroundings
True & False Quiz
Solid. Liquid. Gas.
✓True
✗False
25
Questions
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Ch.1
Chapter
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IX
Class
Why True & False for Matter in Our Surroundings?
How this format sharpens your conceptual clarity
🔵 Matter in Our Surroundings forms the very foundation of chemistry — every physical change, state transition, and particle model begins here.
✅ T/F questions target states of matter, interconversion (melting, boiling, sublimation), latent heat, and effect of pressure/temperature.
🎯 Sublimation = solid → gas directly (e.g. dry ice, camphor) — students often confuse it with evaporation (liquid → gas).
📋
Read each statement carefully. Click True or False — instant feedback with explanation appears. Submit anytime; unattempted questions are marked Skipped.
Q 1
Everything in the universe that occupies space and has mass is called matter.
Q 2
Air is not considered matter because it is invisible.
Q 3
Particles of matter are stationary and do not move.
Q 4
The smell of hot food can reach us from a distance due to the diffusion of its particles.
Q 5
Solids have a definite shape and definite volume.
Q 6
Gases can be compressed more easily than solids or liquids.
Q 7
Liquids have fixed volume but not fixed shape.
Q 8
A wooden table is not classified as matter.
Q 9
The particles in a liquid are tightly packed with no movement.
Q 10
Diffusion occurs faster in solids compared to gases.
Q 11
Melting is the change of solid to liquid at a fixed temperature.
Q 12
Evaporation is a surface phenomenon.
Q 13
When a liquid changes to gas, it absorbs heat from the surroundings.
Q 14
Intermolecular forces are strongest in gases.
Q 15
Increasing the temperature increases the rate of diffusion.
Q 16
Plasma is one of the states of matter commonly found at room temperature.
Q 17
Sublimation is the conversion of a liquid directly into solid.
Q 18
Water vapor present in air is matter.
Q 19
Boiling and evaporation are exactly the same process.
Q 20
Particles of all states of matter have spaces between them.
Q 21
Liquids can be compressed easily.
Q 22
Solids diffuse very slowly when compared to liquids and gases.
Q 23
A change of state from solid to gas directly is called fusion.
Q 24
Cooling a gas can condense it into a liquid.
Q 25
Solids, liquids, and gases can all undergo diffusion.
Key Takeaways — Matter in Our Surroundings
Core facts for CBSE Boards & exams
1
Three states of matter: Solid (fixed shape & volume), Liquid (fixed volume, no fixed shape), Gas (no fixed shape or volume).
2
Plasma is the fourth state of matter — found in stars and fluorescent lamps; extremely high energy ionised gas.
3
Melting point of ice = 0°C; Boiling point of water = 100°C at 1 atm pressure.
4
Latent heat: heat absorbed/released during a state change at constant temperature.
5
Evaporation causes cooling — it depends on surface area, temperature, humidity, and wind speed.
6
Sublimation: solid → gas directly; examples: dry ice (CO₂), camphor, iodine, naphthalene.