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Question (21)

QN002531

Evaporation differs from boiling because evaporation:

(A) Occurs only at boiling point
(B) Occurs at all temperatures from the surface
(C) Occurs only inside the liquid
(D) Does not involve particles

Correct Answer: B

Explanation:

Evaporation takes place at all temperatures from the surface of liquids.

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Question (22)

QN002532

Which property classifies both liquids and gases as fluids?

(A) They are hard
(B) They have fixed shape
(C) They can flow
(D) They are always colourless

Correct Answer: C

Explanation:

Liquids and gases can flow, so they are called fluids.

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Question (23)

QN002533

A metal spoon remains solid at room temperature because:

(A) Its particles do not move at all
(B) Its particles are tightly packed with strong attraction
(C) It contains no interparticle spaces
(D) It has zero thermal energy

Correct Answer: B

Explanation:

Strong interparticle attraction keeps particles tightly packed.

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Question (24)

QN002534

Which observation best proves that matter contains moving particles?

(A) Stone sinks in water
(B) Fragrance of incense spreads in a room
(C) Iron rusts slowly
(D) Wood floats on water

Correct Answer: B

Explanation:

Fragrance spreads due to continuous movement of particles.

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Question (25)

QN002535

Potassium permanganate spreads faster in hot water than in cold water because:

(A) Hot water has no particles
(B) Particles move faster at higher temperature
(C) Cold water repels potassium permanganate
(D) Hot water dissolves colour chemically

Correct Answer: B

Explanation:

Higher temperature increases movement of particles.

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Question (26)

QN002536

A gas jar filled with smoke is connected to an empty gas jar. After some time, smoke spreads into both jars. This shows that gases:

(A) Have fixed volume
(B) Have strong interparticle attraction
(C) Occupy all available space
(D) Cannot move freely

Correct Answer: C

Explanation:

Gas particles spread to fill all available space.

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Question (27)

QN002537

Which of the following correctly arranges states of matter in increasing interparticle spacing?

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

Correct Answer: C

Explanation:

Solids have least spacing, gases have maximum spacing.

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Question (28)

QN002538

Acharya Kanad proposed that matter is made of tiny indivisible particles called:

(A) Molecules
(B) Electrons
(C) Parmanu
(D) Neutrons

Correct Answer: C

Explanation:

Acharya Kanad called tiny indivisible particles Parmanu.

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Question (29)

QN002539

If interparticle distance increases slightly, the force of attraction between particles:

(A) Increases sharply
(B) Remains unchanged
(C) Decreases drastically
(D) Becomes zero immediately

Correct Answer: C

Explanation:

Interparticle attraction decreases rapidly with increasing distance.

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Question (30)

QN002540

A liquid has a definite volume but no fixed shape because its particles:

(A) Are completely free like gases
(B) Are fixed like solids
(C) Can move within limited space
(D) Have no attraction at all

Correct Answer: C

Explanation:

Liquid particles can move but remain close together.

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Question (21)

Evaporation differs from boiling because evaporation:

Explanation:

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Question (22)

Which property classifies both liquids and gases as fluids?

Explanation:

Link:

Question (23)

A metal spoon remains solid at room temperature because:

Explanation:

Link:

Question (24)

Which observation best proves that matter contains moving particles?

Explanation:

Link:

Question (25)

Potassium permanganate spreads faster in hot water than in cold water because:

Explanation:

Link:

Question (26)

A gas jar filled with smoke is connected to an empty gas jar. After some time, smoke spreads into both jars. This shows that gases:

Explanation:

Link:

Question (27)

Which of the following correctly arranges states of matter in increasing interparticle spacing?

Explanation:

Link:

Question (28)

Acharya Kanad proposed that matter is made of tiny indivisible particles called:

Explanation:

Link:

Question (29)

If interparticle distance increases slightly, the force of attraction between particles:

Explanation:

Link:

Question (30)

A liquid has a definite volume but no fixed shape because its particles:

Explanation:

Link:

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