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Question (11)

QN002641

Why do solids retain a fixed shape?

(A) Their particles move freely
(B) Their particles are fixed at definite positions
(C) Solids have no particles
(D) Their particles continuously diffuse

Correct Answer: B

Explanation:

Solid particles remain fixed in position.

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Question (12)

QN002642

A crystal of potassium permanganate colours the entire beaker of water after some time due to:

(A) Condensation
(B) Evaporation
(C) Diffusion of particles
(D) Compression of water

Correct Answer: C

Explanation:

Potassium permanganate particles diffuse in water.

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Question (13)

QN002643

Which state of matter shows the least particle movement?

(A) Gas
(B) Liquid
(C) Solid
(D) Vapour

Correct Answer: C

Explanation:

Solid particles only vibrate slightly.

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Question (14)

QN002644

Heating increases diffusion because particles:

(A) Become heavier
(B) Move faster
(C) Become fixed
(D) Decrease in size

Correct Answer: B

Explanation:

Heating increases kinetic energy and movement of particles.

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Question (15)

QN002645

Why does the smell of incense spread throughout a classroom?

(A) Smoke particles remain at one place
(B) Air particles carry smell due to continuous movement
(C) Smell particles disappear instantly
(D) Smoke changes into liquid

Correct Answer: B

Explanation:

Continuous movement of particles spreads the smell.

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Question (16)

QN002646

Which process involves mixing of particles due to their motion?

(A) Reflection
(B) Diffusion
(C) Sedimentation
(D) Filtration

Correct Answer: B

Explanation:

Diffusion causes mixing due to particle movement.

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Question (17)

QN002647

Gas particles move more rapidly than liquid particles mainly because:

(A) They are heavier
(B) They have greater freedom of movement
(C) They have no energy
(D) Liquids contain no particles

Correct Answer: B

Explanation:

Gas particles have maximum freedom of movement.

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Question (18)

QN002648

Which statement about liquid particles is correct?

(A) They are completely fixed
(B) They move more freely than solid particles
(C) They do not move at all
(D) They move faster than gas particles always

Correct Answer: B

Explanation:

Liquid particles move more freely than solids.

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Question (19)

QN002649

A tea bag colours hot water faster than cold water because:

(A) Tea particles are larger in hot water
(B) Hot water particles move faster
(C) Cold water contains no spaces
(D) Tea dissolves chemically in hot water only

Correct Answer: B

Explanation:

Faster moving particles increase diffusion rate.

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Question (20)

QN002650

Which activity best proves that particles of matter are continuously moving?

(A) Compression of iron
(B) Smell of perfume spreading in air
(C) Breaking glass
(D) Freezing water

Correct Answer: B

Explanation:

Perfume smell spreads due to continuous particle motion.

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Question (11)

Why do solids retain a fixed shape?

Explanation:

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Question (12)

A crystal of potassium permanganate colours the entire beaker of water after some time due to:

Explanation:

Link:

Question (13)

Which state of matter shows the least particle movement?

Explanation:

Link:

Question (14)

Heating increases diffusion because particles:

Explanation:

Link:

Question (15)

Why does the smell of incense spread throughout a classroom?

Explanation:

Link:

Question (16)

Which process involves mixing of particles due to their motion?

Explanation:

Link:

Question (17)

Gas particles move more rapidly than liquid particles mainly because:

Explanation:

Link:

Question (18)

Which statement about liquid particles is correct?

Explanation:

Link:

Question (19)

A tea bag colours hot water faster than cold water because:

Explanation:

Link:

Question (20)

Which activity best proves that particles of matter are continuously moving?

Explanation:

Link:

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