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Question (31)

QN004932

Which statement correctly describes melting?

(A) Gas changes into liquid
(B) Liquid changes into gas
(C) Solid changes into liquid
(D) Liquid changes into solid

Correct Answer: C

Explanation:

Melting is the change of a solid into a liquid.

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Question (32)

QN004933

Which statement correctly describes freezing?

(A) Liquid changes into solid
(B) Solid changes into liquid
(C) Gas changes into liquid
(D) Solid changes into gas

Correct Answer: A

Explanation:

Freezing is the change of a liquid into a solid.

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Question (33)

QN004934

A coconut oil sample becomes solid during winter. This shows that:

(A) Cooling can change liquids into solids
(B) Heating always forms solids
(C) Liquids cannot change state
(D) Solids cannot melt

Correct Answer: A

Explanation:

Cooling can convert a liquid into a solid.

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Question (34)

QN004935

A student wants to change water into ice as quickly as possible. Which method is most suitable?

(A) Keep it in sunlight
(B) Place it in a freezer
(C) Stir continuously
(D) Pour into a larger container

Correct Answer: B

Explanation:

A freezer cools water and helps it freeze quickly.

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Question (35)

QN004936

Which sequence is correct?

(A) Water Vapour → Water → Ice
(B) Ice → Water Vapour → Water
(C) Ice → Water → Water Vapour
(D) Water → Ice → Water Vapour

Correct Answer: C

Explanation:

Ice melts to water and water changes to vapour on heating.

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Question (36)

QN004937

A science fair uses 96 ice cubes. If 32 cubes melt each hour, how many cubes melt in 2 hours?

(A) 32
(B) 48
(C) 64
(D) 96

Correct Answer: C

Explanation:

32 × 2 = 64 cubes.

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Question (37)

QN004938

A factory cools 250 litres of liquid wax. If 80% solidifies, how many litres become solid?

(A) 150
(B) 175
(C) 200
(D) 225

Correct Answer: C

Explanation:

80% of 250 = 200 litres.

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Question (38)

QN004939

Why are changes of state important in everyday life?

(A) They show how substances can change form through heating or cooling
(B) They permanently destroy substances
(C) They occur only in laboratories
(D) They happen only with water

Correct Answer: A

Explanation:

Heating and cooling can change the state of substances.

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Question (39)

QN004940

Which activity best demonstrates freezing?

(A) Ice cream melting in the sun
(B) Water turning into ice in a freezer
(C) Wet clothes drying
(D) Steam rising from hot tea

Correct Answer: B

Explanation:

Freezing changes water into ice.

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Question (40)

QN004941

Which statement best connects science with society?

(A) Understanding changes of state helps in food storage, refrigeration, and daily-life applications
(B) Changes of state are useful only for scientists
(C) Water changes state only in textbooks
(D) Freezing and melting have no practical use

Correct Answer: A

Explanation:

Knowledge of state changes is useful in many daily-life applications.

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Question (31)

Which statement correctly describes melting?

Explanation:

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Question (32)

Which statement correctly describes freezing?

Explanation:

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Question (33)

A coconut oil sample becomes solid during winter. This shows that:

Explanation:

Link:

Question (34)

A student wants to change water into ice as quickly as possible. Which method is most suitable?

Explanation:

Link:

Question (35)

Which sequence is correct?

Explanation:

Link:

Question (36)

A science fair uses 96 ice cubes. If 32 cubes melt each hour, how many cubes melt in 2 hours?

Explanation:

Link:

Question (37)

A factory cools 250 litres of liquid wax. If 80% solidifies, how many litres become solid?

Explanation:

Link:

Question (38)

Why are changes of state important in everyday life?

Explanation:

Link:

Question (39)

Which activity best demonstrates freezing?

Explanation:

Link:

Question (40)

Which statement best connects science with society?

Explanation:

Link:

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