Question
Why a cotton garment cannot keep us as warm in winter as a woollen sweater can?
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Answer
Woollen sweater traps air in between whereas cotton allows the air to pass through it. Air being a bad conductor of heat does not let body heat to escape beyond the sweater. Therefore, it is much warmer.
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→In Ladakh, people build ice stupas to conserve water.
Q.1. Why are they conical?
(a) Look aesthetic
(b) Symbolic design
(c) Slow melting due to minimum exposed surface area
(d) Easy to build
Q.2. When do they release water?
(a) Winter$\quad$(b) Spring
(c) Summer$\quad$(d) Monsoon
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