Matter - ICSE Class 6 (Chemistry)

🧊 ICSE Class 6 Chemistry
Chapter: Matter

100+ Questions MCQ · Fill · T/F · Short · Long

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MCQ (1-20) Fill (21-30) T/F (31-38) V. Short (39-48) Short (49-59) Long (60-66)

📝 Multiple Choice Questions

1-20

MCQ 1

State of matter with definite shape and definite volume is:
(a) Solid (b) Liquid (c) Gas (d) Solid & Liquid

✅ Answer: (a) Solid

MCQ 2

Interparticular force of attraction in gases is:
(a) Stronger than solids & liquids (b) Weaker than solids & liquids
(c) Stronger than liquids (d) Stronger than solids

✅ Answer: (b) Weaker than both solids & liquids

MCQ 3

Conversion of gaseous state directly into solid is:
(a) Sublimation (b) Condensation (c) Deposition (d) Evaporation

✅ Answer: (c) Deposition

MCQ 4

Reason for difference in properties of three states:
(a) Force of repulsion (b) Interparticular space
(c) Interparticular force of attraction (d) Movement of particles

✅ Answer: (c) Interparticular force of attraction

MCQ 5

Interparticular space is negligible in:
(a) Liquids (b) Solids (c) Gases (d) Both liquids & solids

✅ Answer: (b) Solids

MCQ 6

Force of attraction between same particles:
(a) Adhesive force (b) Cohesive force (c) Electrostatic force (d) None

✅ Answer: (b) Cohesive force

MCQ 7

Which is a kind of matter?
Light / Petroleum / Sound / Heat

✅ Answer: Petroleum

MCQ 8

Quantity of matter in an object is:
Mass / Volume / Density / Weight

✅ Answer: Mass

MCQ 9

Space occupied by matter is:
Mass / Area / Volume / Weight

✅ Answer: Volume

MCQ 10

State with neither definite shape nor volume:
Solid / Liquid / Gas / None

✅ Answer: Gas

MCQ 11

Largest intermolecular gaps occur in:
Water / Iron ball / Salt / Air

✅ Answer: Air

MCQ 12

A substance that sublimes:
Water / Plastic / Milk / Iodine

✅ Answer: Iodine

MCQ 13

Process by which solid changes to liquid:
Freezing / Melting / Condensation / Evaporation

✅ Answer: Melting

MCQ 14

Change of liquid into vapour below boiling point:
Melting / Freezing / Boiling / Evaporation

✅ Answer: Evaporation

MCQ 15

Which diffuses fastest?
Water / Gold / Milk / Nitrogen

✅ Answer: Nitrogen

MCQ 16

Strongest cohesive force:
Petrol / Oxygen / Mercury / Hydrogen

✅ Answer: Mercury

MCQ 17

A solid:
(a) Has definite shape (b) Cannot flow (c) Cannot be compressed easily (d) All of the above

✅ Answer: (d) All of the above

MCQ 18

Which is man-made matter?
Coal / Cotton / Plastic / Silk

✅ Answer: Plastic

MCQ 19

A gas fills available space because:
(a) Strong attraction (b) No intermolecular space
(c) Large intermolecular space (d) Fixed volume

✅ Answer: (c) Large intermolecular space

MCQ 20

Heating can cause:
(a) State change (b) Expansion (c) Chemical change (d) All of these

✅ Answer: (d) All of these

📋 Fill in the Blanks

21-30

Fill 21

All matter is made up of ______.

✅ Answer: atoms

Fill 22

Force between same molecules is ______ force.

✅ Answer: cohesive

Fill 23

A liquid has definite ______ but no definite shape.

✅ Answer: volume

Fill 24

Intermolecular spaces are maximum in ______.

✅ Answer: gases

Fill 25

Water boils at ______ °C.

✅ Answer: 100

Fill 26

Liquids and gases are called ______.

✅ Answer: fluids

Fill 27

The smallest particle of matter is ______.

✅ Answer: atom

Fill 28

The zig-zag motion is called ______ movement.

✅ Answer: Brownian

Fill 29

Mixing of particles on their own is ______.

✅ Answer: diffusion

Fill 30

Water changes into ice by ______.

✅ Answer: freezing

🔘 True / False (Corrected)

31-38

T/F 31

Evaporation is natural.

✅ Answer: True

T/F 32

Liquids are more closely packed than gases.

✅ Answer: True

T/F 33

Beyond boiling point substance remains liquid.

✅ Answer: False

T/F 34

Only water exists in three states.

✅ Answer: False

T/F 35

Gases have weakest intermolecular force.

✅ Answer: True

T/F 36

Solids have largest intermolecular space.

✅ Answer: False

T/F 37

Evaporation and boiling are same.

✅ Answer: False

T/F 38

Gas has no free surface.

✅ Answer: True

📌 Very Short Answers

39-48

VSA 39

Define matter.

✅ Answer: Anything that occupies space and has mass is called matter.

VSA 40

Define melting point.

✅ Answer: The fixed temperature at which a solid changes into liquid at atmospheric pressure is called melting point.

VSA 41

Define condensation.

✅ Answer: The process by which a gas changes into liquid on cooling is called condensation.

VSA 42

Define diffusion.

✅ Answer: The process of mixing of particles of two different substances on their own is called diffusion.

VSA 43

Define Brownian movement.

✅ Answer: The continuous zig-zag motion of suspended particles in a fluid is called Brownian movement.

VSA 44

What are fluids?

✅ Answer: Substances that can flow are called fluids. Liquids and gases are fluids.

VSA 45

What is cohesive force?

✅ Answer: The force of attraction between particles of the same substance is called cohesive force.

VSA 46

What is intermolecular space?

✅ Answer: The empty space between the particles of matter is called intermolecular space.

VSA 47

What is boiling point?

✅ Answer: The fixed temperature at which a liquid changes into gas (vapour) at atmospheric pressure is called boiling point.

VSA 48

What is liquefaction?

✅ Answer: The process of converting a gas into liquid by applying pressure and lowering temperature is called liquefaction.

📝 Short Answer Questions

49-59

SA 49

Why solids have definite shape?

✅ Answer: Solids have definite shape because the intermolecular force of attraction is very strong and particles are tightly packed. They cannot move from their fixed positions.

SA 50

Why liquids have no definite shape?

✅ Answer: Liquids have no definite shape because the intermolecular force is weaker than solids. The particles can slide over each other, taking the shape of the container.

SA 51

Why gases are highly compressible?

✅ Answer: Gases have maximum intermolecular space and very weak force of attraction. When pressure is applied, the particles come closer, reducing volume easily.

SA 52

Why sugar dissolves without increase in water level?

✅ Answer: Sugar particles get into the intermolecular spaces between water molecules without increasing the volume.

SA 53

Why railway tracks have gaps?

✅ Answer: Rails expand on heating due to thermal expansion. Gaps prevent bending or damage in summer.

SA 54

Why perfume spreads in room?

✅ Answer: Perfume evaporates and its particles diffuse into air and reach every part of the room due to large intermolecular space and movement of particles.

SA 55

Why we shiver after bath?

✅ Answer: Water evaporates from our body taking latent heat of vaporisation from the body, cooling it down.

SA 56

Why empty bottle is lighter?

✅ Answer: Empty bottle contains air which has mass, but much less than liquid filled bottle.

SA 57

Why naphthalene balls reduce in size?

✅ Answer: Naphthalene sublimes — it directly changes from solid to vapour without becoming liquid.

SA 58

Why liquids flow but solids do not?

✅ Answer: In liquids, particles are loosely packed and can slide over each other. In solids, particles are tightly packed and cannot move from their positions.

SA 59

Why egg pops out when air blown in bottle?

✅ Answer: Air blown increases pressure inside; the air pushes the egg out to equalise pressure.

📚 Long Answer Questions

60-66

LA 60

Explain three states of matter with examples and properties.

✅ Answer:
Solid: Definite shape, volume, high density, incompressible. Example: Wood, Iron.
Liquid: Definite volume, no fixed shape, flows, less density than solids. Example: Water, Milk.
Gas: No definite shape/volume, highly compressible, fills container. Example: Air, Oxygen.

LA 61

Explain interconversion of states of matter with diagram.

✅ Answer:
Matter can change from one state to another by changing temperature/pressure.
Solid → Liquid: Melting
Liquid → Gas: Boiling/Evaporation
Gas → Liquid: Condensation
Liquid → Solid: Freezing
Solid → Gas: Sublimation
Gas → Solid: Deposition

LA 62

Difference between Melting and Boiling.

✅ Answer:
Melting: Solid → Liquid, occurs at melting point, heat absorbed (latent heat of fusion).
Boiling: Liquid → Gas, occurs at boiling point, heat absorbed (latent heat of vaporisation).

LA 63

Difference between Vaporisation and Evaporation.

✅ Answer:
Vaporisation: Liquid → Gas at boiling point; occurs throughout the liquid; fast process.
Evaporation: Liquid → Gas below boiling point; occurs at surface only; slow process.

LA 64

Difference between Solidification and Condensation.

✅ Answer:
Solidification (Freezing): Liquid → Solid, heat is released.
Condensation: Gas → Liquid, heat is released.

LA 65

Difference between Gas and Vapour.

✅ Answer:
Gas: A state of matter that exists at room temperature (e.g., Oxygen).
Vapour: Gaseous state of a substance which is liquid/solid at room temperature (e.g., Steam).

LA 66

Difference between Miscible and Immiscible Liquids.

✅ Answer:
Miscible: Liquids that mix completely to form a uniform mixture (e.g., Alcohol and water).
Immiscible: Liquids that do not mix and form separate layers (e.g., Oil and water).

⭐ Extra Important Questions (ICSE Focus)

67-74

Extra 67

Explain three effects of heat on matter.

✅ Answer:
1. Interconversion of states: Heat can change solid to liquid, liquid to gas.
2. Thermal expansion: Matter expands on heating.
3. Chemical change: Heat can cause chemical reactions (burning).

Extra 68

Why candle becomes smaller on burning?

✅ Answer: Wax melts → vaporizes → reacts with oxygen (chemical change) producing CO₂ and water vapour. Wax is consumed.

Extra 69

Why solids usually have higher density?

✅ Answer: Particles are tightly packed with negligible intermolecular space, so mass per unit volume is high.

Extra 70

What happens when metal ball is heated?

✅ Answer: It expands — shows thermal expansion. If heated too much, it may melt (state change).

Extra 71

Differentiate between physical change and chemical change with example.

✅ Answer:
Physical change: No new substance formed; reversible. Example: Ice → Water.
Chemical change: New substance formed; irreversible. Example: Burning candle.

Extra 72

Why ink spreads in water?

✅ Answer: Particles of ink diffuse into spaces between water molecules due to large intermolecular space and motion of particles.

Extra 73

Why empty bottle is lighter?

✅ Answer: Air has mass, but much less than any liquid; so empty bottle feels lighter.

Extra 74

Why egg pops out when air blown in bottle?

✅ Answer: Air pressure inside increases; egg is pushed out to equalize pressure.

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Matter · ICSE Class 6

100+ Handpicked Questions with Answers. MCQ · Fill · T/F · Short · Long & Extra Questions.

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