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Question (41)

QN0037561

A village has 5 underground tankas, each storing 20,000 litres of water. What is their total storage capacity?

(A) 50,000 litres
(B) 80,000 litres
(C) 100,000 litres
(D) 120,000 litres

Correct Answer: C

Explanation:

Total capacity = 5 × 20,000 = 100,000 litres.

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Question (42)

QN0037562

A tanka has dimensions 6.1 m × 4.27 m × 2.44 m. What is its approximate volume?

(A) 43.6 m³
(B) 53.6 m³
(C) 63.6 m³
(D) 73.6 m³

Correct Answer: C

Explanation:

Volume = 6.1 × 4.27 × 2.44 ≈ 63.6 m³.

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Question (43)

QN0037563

Why is the first rainwater in some traditional rooftop harvesting systems not collected?

(A) It has no water
(B) It is used to clean roofs and pipes
(C) It contains groundwater
(D) It increases evaporation

Correct Answer: B

Explanation:

The first rain washes dust and impurities from roofs and pipes, so it is often allowed to flow away.

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Question (44)

QN0037564

A rooftop harvesting system collects 100 units of rainwater with 80% efficiency. How much water is effectively collected?

(A) 60 units
(B) 70 units
(C) 80 units
(D) 90 units

Correct Answer: C

Explanation:

Effective collection = 80% of 100 = 80 units.

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Question (45)

QN0037565

If 200 households each collect 50,000 litres of rainwater annually, what is the total amount collected?

(A) 50 lakh litres
(B) 75 lakh litres
(C) 1 crore litres
(D) 2 crore litres

Correct Answer: C

Explanation:

200 × 50,000 = 10,000,000 litres = 1 crore litres.

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Question (46)

QN0037566

Rooftop rainwater harvesting in Shillong can provide approximately what percentage of total water requirements according to the chapter?

(A) 5–10%
(B) 15–25%
(C) 30–40%
(D) 50–60%

Correct Answer: B

Explanation:

Rooftop rainwater harvesting in Shillong can meet about 15–25% of total water requirements.

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Question (47)

QN0037567

Shillong receives heavy rainfall but still faces water scarcity during certain periods. Which explanation is most appropriate?

(A) Rainfall is absent throughout the year
(B) Water availability and management can remain inadequate despite high rainfall
(C) The city has no rooftops
(D) Groundwater never exists in Shillong

Correct Answer: B

Explanation:

High rainfall does not automatically guarantee adequate usable water throughout the year; storage and management are important.

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Question (48)

QN0037568

Which state made rooftop rainwater harvesting compulsory for all houses?

(A) Rajasthan
(B) Tamil Nadu
(C) Punjab
(D) Assam

Correct Answer: B

Explanation:

Tamil Nadu made rooftop rainwater harvesting compulsory for all houses.

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Question (49)

QN0037569

Bamboo drip irrigation is a traditional water management system associated with:

(A) Meghalaya
(B) Rajasthan
(C) Gujarat
(D) Punjab

Correct Answer: A

Explanation:

Bamboo drip irrigation is a traditional system used in Meghalaya to distribute water through bamboo channels.

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Question (50)

QN0037570

Which combination would provide the most sustainable approach to managing water resources?

(A) Unlimited groundwater extraction
(B) Only construction of large dams
(C) Rainwater harvesting, efficient water use and conservation
(D) Increasing water-intensive crops everywhere

Correct Answer: C

Explanation:

Sustainable water management combines conservation, efficient use, rainwater harvesting and appropriate management of available resources.

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Question (41)

A village has 5 underground tankas, each storing 20,000 litres of water. What is their total storage capacity?

Explanation:

Link:

Question (42)

A tanka has dimensions 6.1 m × 4.27 m × 2.44 m. What is its approximate volume?

Explanation:

Link:

Question (43)

Why is the first rainwater in some traditional rooftop harvesting systems not collected?

Explanation:

Link:

Question (44)

A rooftop harvesting system collects 100 units of rainwater with 80% efficiency. How much water is effectively collected?

Explanation:

Link:

Question (45)

If 200 households each collect 50,000 litres of rainwater annually, what is the total amount collected?

Explanation:

Link:

Question (46)

Rooftop rainwater harvesting in Shillong can provide approximately what percentage of total water requirements according to the chapter?

Explanation:

Link:

Question (47)

Shillong receives heavy rainfall but still faces water scarcity during certain periods. Which explanation is most appropriate?

Explanation:

Link:

Question (48)

Which state made rooftop rainwater harvesting compulsory for all houses?

Explanation:

Link:

Question (49)

Bamboo drip irrigation is a traditional water management system associated with:

Explanation:

Link:

Question (50)

Which combination would provide the most sustainable approach to managing water resources?

Explanation:

Link:

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