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Question (21)

QN0034402

If 80 kg of waste is composted and 25% remains undecomposed, how much waste remains?

(A) 10 kg
(B) 15 kg
(C) 20 kg
(D) 25 kg

Correct Answer: C

Explanation:

25% of 80 = 20 kg.

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Question (22)

QN0034403

Which of the following wastes takes the longest time to decompose naturally?

(A) Fruit peel
(B) Paper
(C) Plastic bottle
(D) Dry leaves

Correct Answer: C

Explanation:

Plastic bottles are non-biodegradable.

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Question (23)

QN0034404

A compost heap contains 72 kg of leaves and 48 kg of vegetable waste. What is the ratio of leaves to vegetable waste?

(A) 2 : 1
(B) 3 : 2
(C) 4 : 3
(D) 5 : 2

Correct Answer: B

Explanation:

72 : 48 = 3 : 2.

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Question (24)

QN0034405

Why is compost considered environmentally friendly?

(A) It increases plastic production.
(B) It recycles organic waste into useful material.
(C) It prevents plant growth.
(D) It creates non-biodegradable waste.

Correct Answer: B

Explanation:

Compost converts waste into useful manure.

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Question (25)

QN0034406

If 200 biodegradable items are collected and 150 are composted successfully, what percentage is composted?

(A) 60%
(B) 70%
(C) 75%
(D) 80%

Correct Answer: C

Explanation:

(150/200) × 100 = 75%.

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Question (26)

QN0034407

Which waste material is least likely to be broken down by microorganisms?

(A) Leaf litter
(B) Vegetable peel
(C) Plastic straw
(D) Fruit waste

Correct Answer: C

Explanation:

Plastic straw is non-biodegradable.

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Question (27)

QN0034408

A garden produces 24 kg of compost from 96 kg of waste. What fraction of the original mass becomes compost?

(A) 1/2
(B) 1/3
(C) 1/4
(D) 1/5

Correct Answer: C

Explanation:

24/96 = 1/4.

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Question (28)

QN0034409

Which statement correctly describes biodegradable waste?

(A) It cannot be broken down naturally.
(B) It is broken down by decomposers.
(C) It remains unchanged forever.
(D) It is made only of plastic.

Correct Answer: B

Explanation:

Biodegradable waste can be decomposed by microorganisms.

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Question (29)

QN0034410

If 45 kg of waste decomposes each week, how much waste decomposes in 4 weeks?

(A) 90 kg
(B) 135 kg
(C) 180 kg
(D) 225 kg

Correct Answer: C

Explanation:

45 × 4 = 180 kg.

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Question (30)

QN0034411

What would happen if decomposers disappeared from an ecosystem?

(A) Dead matter would accumulate.
(B) Producers would stop making food immediately.
(C) Rainfall would increase.
(D) Rocks would decompose faster.

Correct Answer: A

Explanation:

Dead organic matter would not be broken down.

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Question (21)

If 80 kg of waste is composted and 25% remains undecomposed, how much waste remains?

Explanation:

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Question (22)

Which of the following wastes takes the longest time to decompose naturally?

Explanation:

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Question (23)

A compost heap contains 72 kg of leaves and 48 kg of vegetable waste. What is the ratio of leaves to vegetable waste?

Explanation:

Link:

Question (24)

Why is compost considered environmentally friendly?

Explanation:

Link:

Question (25)

If 200 biodegradable items are collected and 150 are composted successfully, what percentage is composted?

Explanation:

Link:

Question (26)

Which waste material is least likely to be broken down by microorganisms?

Explanation:

Link:

Question (27)

A garden produces 24 kg of compost from 96 kg of waste. What fraction of the original mass becomes compost?

Explanation:

Link:

Question (28)

Which statement correctly describes biodegradable waste?

Explanation:

Link:

Question (29)

If 45 kg of waste decomposes each week, how much waste decomposes in 4 weeks?

Explanation:

Link:

Question (30)

What would happen if decomposers disappeared from an ecosystem?

Explanation:

Link:

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