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Question (21)

QN002651

The movement of particles from one place to another due to random motion is known as:

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

Correct Answer: B

Explanation:

Diffusion occurs due to random motion of particles.

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Question (22)

QN002652

Why does diffusion occur slowly in liquids compared to gases?

(A) Liquid particles are fixed
(B) Liquid particles have less freedom of movement
(C) Liquids contain no particles
(D) Liquid particles do not collide

Correct Answer: B

Explanation:

Liquid particles move less freely than gas particles.

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Question (23)

QN002653

Which state allows particles to move only within a limited region?

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

Correct Answer: B

Explanation:

Liquid particles can move but within limited space.

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Question (24)

QN002654

A drop of blue ink spreads evenly in water after stirring because particles:

(A) Stop moving after mixing
(B) Continuously move and mix with water particles
(C) Become heavier
(D) Settle immediately

Correct Answer: B

Explanation:

Continuous particle movement causes mixing.

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Question (25)

QN002655

Which of the following shows diffusion in liquids?

(A) Aroma spreading in air
(B) Ink spreading in water
(C) Compression of gas
(D) Hammering iron

Correct Answer: B

Explanation:

Ink spreads in water due to diffusion.

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Question (26)

QN002656

Solids show negligible diffusion because their particles:

(A) Have maximum energy
(B) Are tightly packed and almost fixed
(C) Move rapidly in all directions
(D) Have no attraction

Correct Answer: B

Explanation:

Solid particles cannot move freely.

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Question (27)

QN002657

Which state of matter shows fastest diffusion rate?

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

Correct Answer: C

Explanation:

Gas particles move fastest.

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Question (28)

QN002658

Particle motion in gases becomes faster when temperature:

(A) Decreases
(B) Becomes zero
(C) Increases
(D) Remains constant always

Correct Answer: C

Explanation:

Increasing temperature increases kinetic energy.

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Question (29)

QN002659

Why can liquids flow easily?

(A) Their particles are fixed
(B) Their particles can slide past one another
(C) They contain no particles
(D) They have no mass

Correct Answer: B

Explanation:

Liquid particles slide over one another.

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Question (30)

QN002660

A bottle of scent is opened in a room. The smell reaches nearby students first because:

(A) Gas particles move gradually from source outward
(B) Students create the smell
(C) Smell particles move only upward
(D) Air becomes solid near the bottle

Correct Answer: A

Explanation:

Gas particles diffuse outward from the source.

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Question (21)

The movement of particles from one place to another due to random motion is known as:

Explanation:

Link:

Question (22)

Why does diffusion occur slowly in liquids compared to gases?

Explanation:

Link:

Question (23)

Which state allows particles to move only within a limited region?

Explanation:

Link:

Question (24)

A drop of blue ink spreads evenly in water after stirring because particles:

Explanation:

Link:

Question (25)

Which of the following shows diffusion in liquids?

Explanation:

Link:

Question (26)

Solids show negligible diffusion because their particles:

Explanation:

Link:

Question (27)

Which state of matter shows fastest diffusion rate?

Explanation:

Link:

Question (28)

Particle motion in gases becomes faster when temperature:

Explanation:

Link:

Question (29)

Why can liquids flow easily?

Explanation:

Link:

Question (30)

A bottle of scent is opened in a room. The smell reaches nearby students first because:

Explanation:

Link:

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