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Question (21)

QN001261

Which of the following is an example of preventing an undesirable change?

(A) Cooking vegetables
(B) Applying oil on bicycle chains
(C) Growing plants
(D) Ripening mangoes

Correct Answer: B

Explanation:

Oil prevents rusting by reducing contact with moisture.

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Question (22)

QN001262

Applying paint on iron objects mainly helps to

(A) increase rusting
(B) reduce melting
(C) prevent contact with air and moisture
(D) increase burning

Correct Answer: C

Explanation:

Paint forms a protective layer.

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Question (23)

QN001263

Which process below is desirable because it produces useful products naturally?

(A) Fermentation in making bread
(B) Spoiling of fruits
(C) Rusting of bridges
(D) Cracking of walls

Correct Answer: A

Explanation:

Fermentation helps bread rise.

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Question (24)

QN001264

Which situation best represents an undesirable change in society?

(A) Growth of crops
(B) Water contamination
(C) Compost preparation
(D) Food cooking

Correct Answer: B

Explanation:

Water contamination harms health and environment.

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Question (25)

QN001265

Why is cleaning and drying grains before storage important?

(A) To increase moisture content
(B) To promote fungal growth
(C) To prevent spoilage and insect attack
(D) To reduce grain quality

Correct Answer: C

Explanation:

Dry grains remain safe during storage.

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Question (26)

QN001266

Which of the following changes is desirable for human health?

(A) Digestion of food
(B) Food decay
(C) Smoke pollution
(D) Rust formation in pipes

Correct Answer: A

Explanation:

Digestion helps the body absorb nutrients.

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Question (27)

QN001267

Which process below changes food into a harmful condition?

(A) Fermentation for curd
(B) Spoilage due to bacteria
(C) Cooking vegetables
(D) Refrigeration

Correct Answer: B

Explanation:

Harmful bacteria spoil food.

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Question (28)

QN001268

Which of the following is a beneficial biological change?

(A) Decay of stored food
(B) Germination of seeds
(C) Rusting iron rods
(D) Spoiling milk in open air

Correct Answer: B

Explanation:

Germination produces new plants.

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Question (29)

QN001269

Which statement correctly compares desirable and undesirable changes?

(A) Both always cause harm
(B) Desirable changes are useful while undesirable changes are harmful
(C) Undesirable changes are always reversible
(D) Desirable changes never involve chemicals

Correct Answer: B

Explanation:

Desirable changes help humans, while undesirable changes cause damage.

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Question (30)

QN001270

Which example best shows that humans can control undesirable changes?

(A) Painting iron gates to prevent rusting
(B) Burning leaves openly
(C) Allowing food spoilage
(D) Polluting water bodies

Correct Answer: A

Explanation:

Painting protects iron from rusting.

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Question (21)

Which of the following is an example of preventing an undesirable change?

Explanation:

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Question (22)

Applying paint on iron objects mainly helps to

Explanation:

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Question (23)

Which process below is desirable because it produces useful products naturally?

Explanation:

Link:

Question (24)

Which situation best represents an undesirable change in society?

Explanation:

Link:

Question (25)

Why is cleaning and drying grains before storage important?

Explanation:

Link:

Question (26)

Which of the following changes is desirable for human health?

Explanation:

Link:

Question (27)

Which process below changes food into a harmful condition?

Explanation:

Link:

Question (28)

Which of the following is a beneficial biological change?

Explanation:

Link:

Question (29)

Which statement correctly compares desirable and undesirable changes?

Explanation:

Link:

Question (30)

Which example best shows that humans can control undesirable changes?

Explanation:

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