CBSE Class 10 Social Science Water Resources MCQs Set 09

Answer: (c) Dams drive the commercial and industrial sectors of India effectively

Explanation:
1. Nehru's view reflected dams' role in powering industrial and commercial development through irrigation and hydroelectricity.

Teacher's Note:
a) Nehru's 'temples of modern India' line referred to dams driving industrial/commercial development.
b) This reflects their role in irrigation and power generation.

Answer: (c) (I) and (IV)

Explanation:
1. Water scarcity is about quality and management, not just quantity (I), and hydraulic structures (like reservoirs and rainwater harvesting) are part of the solution (IV).

Teacher's Note:
a) Water scarcity is both quantitative and qualitative -- not just about amount.
b) Hydraulic structures are one genuine way to address scarcity; the other two options are too narrow or inaccurate.

Answer: (c) Dams

Explanation:
1. Johads, tanks and kuls are traditional, vernacular water-harvesting structures, while dams are large modern engineered structures, making dams the odd one out.

Teacher's Note:
a) Johads, tanks and kuls are traditional water-harvesting methods.
b) Dams are instead large, modern engineered structures, unlike the other three.

Answer: (a) Western Rajasthan

Explanation:
1. In Western Rajasthan, rooftop rainwater harvesting has declined as other water sources, like the Rajasthan (Indira Gandhi) Canal, became available.

Teacher's Note:
a) Western Rajasthan's traditional rooftop harvesting declined with the arrival of canal water.
b) This shows how new infrastructure can displace older conservation practices.

Answer: (a) Embankment dams are naturally occurring dams in northern India

Explanation:
1. Embankment dams are artificial (human-made) structures, not naturally occurring, making this statement the false one among the options.

Teacher's Note:
a) Embankment dams are artificial structures, not naturally occurring.
b) The other three options correctly describe genuine embankment-dam characteristics.

Answer: (c) Bhopal Lake, one of the largest artificial lakes of its time

Explanation:
1. Bhopal Lake, built by Raja Bhoj in the 11th century, is the structure that would have existed at that specific time among these options.

Teacher's Note:
a) Bhopal Lake dates to the 11th century, built by Raja Bhoj.
b) The other options describe structures from earlier or later periods.

Answer: (d) Rajasthan

Explanation:
1. Rajasthan has a long tradition of rooftop rainwater harvesting for storing drinking water, especially via household tankas.

Teacher's Note:
a) Rajasthan is the traditional home of rooftop rainwater harvesting for drinking water.
b) This practice is closely tied to its underground tankas.

Answer: (c) (I), (IV), (III) and (II)

Explanation:
1. Rainwater is first collected via PVC pipe (I), then filtered through sand and bricks (IV), then carried by underground pipe to a sump for immediate use (III), and any excess goes to a well to recharge groundwater (II).

Teacher's Note:
a) The correct sequence: collect → filter → pipe to sump → well recharge.
b) This traces the full rooftop rainwater harvesting process end to end.

Answer: (d) Bamboo drip irrigation system

Explanation:
1. This gravity-fed, pipe-and-channel system that disperses water directly to plant roots describes the bamboo drip irrigation system used in Meghalaya.

Teacher's Note:
a) Bamboo drip irrigation is a gravity-fed system using bamboo pipes/channels.
b) It is a traditional Meghalaya practice for watering plantation crops directly at the roots.

Answer: (c) Kuls

Explanation:
1. Kuls (also called guls) are the diversion channels of the Western Himalayas used for irrigation.

Teacher's Note:
a) Kuls (guls) are Western Himalayan diversion channels.
b) Khadins and johads are instead Rajasthan rainwater-harvesting structures.

Answer: (a) Both (A) and (R) are true and (R) is the correct explanation of (A)

Explanation:
1. Conserving water resources is indeed urgent, and this is correctly explained by the fact that overuse and poor management will deplete them.

Teacher's Note:
a) Overuse and mismanagement directly threaten to deplete water resources.
b) This is exactly why conservation and management are urgently needed.