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Question (1)

QN002511

A stick of chalk is broken into smaller and smaller pieces. What does this activity mainly prove?

(A) Chalk changes into a new substance on grinding
(B) Matter is made up of tiny particles
(C) Chalk loses its mass on grinding
(D) Matter disappears on breaking

Correct Answer: B

Explanation:

Breaking chalk repeatedly shows that matter is made up of tiny particles.

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Question (2)

QN002512

The basic unit that makes up a larger piece of a substance is called a:

(A) Grain
(B) Crystal
(C) Constituent particle
(D) Mixture

Correct Answer: C

Explanation:

A constituent particle is the basic unit of a substance.

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Question (3)

QN002513

Grinding a chalk stick into powder is considered a:

(A) Chemical change
(B) Nuclear change
(C) Physical change
(D) Biological change

Correct Answer: C

Explanation:

Only the size changes; no new substance is formed.

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Question (4)

QN002514

A student dissolves sugar in water and notices that the top layer also tastes sweet after stirring. This shows that:

(A) Sugar floats on water
(B) Sugar changes into water
(C) Sugar particles spread throughout water
(D) Water becomes heavier only at the bottom

Correct Answer: C

Explanation:

Sugar particles mix uniformly throughout water.

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Question (5)

QN002515

The spaces present between particles of matter are called:

(A) Atomic gaps
(B) Molecular cracks
(C) Interparticle spaces
(D) Empty chambers

Correct Answer: C

Explanation:

The gaps between particles are called interparticle spaces.

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Question (6)

QN002516

Which statement is correct about constituent particles?

(A) They can always be seen with naked eyes
(B) They are extremely small
(C) They exist only in solids
(D) They have no mass

Correct Answer: B

Explanation:

Constituent particles are extremely tiny.

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Question (7)

QN002517

A glass contains 200 mL water. After adding sugar and dissolving it completely, the final level becomes 205 mL instead of 210 mL. The best explanation is:

(A) Sugar evaporated
(B) Water leaked out
(C) Sugar particles occupied interparticle spaces in water
(D) Sugar lost its volume completely

Correct Answer: C

Explanation:

Sugar particles fit into spaces between water particles.

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Question (8)

QN002518

Which of the following will show maximum interparticle attraction?

(A) Smoke
(B) Water vapour
(C) Liquid water
(D) Iron nail

Correct Answer: D

Explanation:

Solids like iron have strongest interparticle attraction.

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Question (9)

QN002519

The minimum temperature at which a solid changes into liquid at atmospheric pressure is called its:

(A) Boiling point
(B) Freezing point
(C) Melting point
(D) Condensation point

Correct Answer: C

Explanation:

Melting point is the temperature where solid changes into liquid.

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Question (10)

QN002520

Ice melts at 0°C while iron melts at 1538°C. This indicates that:

(A) Iron particles are smaller
(B) Ice contains more energy
(C) Iron has much stronger interparticle attraction
(D) Ice is not matter

Correct Answer: C

Explanation:

Higher melting point means stronger attraction between particles.

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Question (1)

A stick of chalk is broken into smaller and smaller pieces. What does this activity mainly prove?

Explanation:

Link:

Question (2)

The basic unit that makes up a larger piece of a substance is called a:

Explanation:

Link:

Question (3)

Grinding a chalk stick into powder is considered a:

Explanation:

Link:

Question (4)

A student dissolves sugar in water and notices that the top layer also tastes sweet after stirring. This shows that:

Explanation:

Link:

Question (5)

The spaces present between particles of matter are called:

Explanation:

Link:

Question (6)

Which statement is correct about constituent particles?

Explanation:

Link:

Question (7)

A glass contains 200 mL water. After adding sugar and dissolving it completely, the final level becomes 205 mL instead of 210 mL. The best explanation is:

Explanation:

Link:

Question (8)

Which of the following will show maximum interparticle attraction?

Explanation:

Link:

Question (9)

The minimum temperature at which a solid changes into liquid at atmospheric pressure is called its:

Explanation:

Link:

Question (10)

Ice melts at 0°C while iron melts at 1538°C. This indicates that:

Explanation:

Link:

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