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In Western Rajasthan's bigger houses, the underground tanks for storing drinking water are traditionally known as:
AKuls
BKhadins
CTankas
DJohads
Answer & Solution
Correct answer: C. Tankas
1. NCERT discusses Rajasthan's rooftop rainwater-harvesting system at length.
2. Tankas are large underground tanks built inside the main house or courtyard, connected to sloping roofs of houses through pipes.
3. Kuls are diversion channels in Himachal; Khadins are agricultural micro-catchments; Johads are surface ponds.
_Source: NCERT Class 10 Geography Contemporary India - II, Ch 3 "Water Resources", §Rooftop Rainwater Harvesting ¶2_
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