Same chapter3 marksDifficulty: Medium
Name three renewable and two non-renewable sources of energy.
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2 marksDifficulty: Easy
State two consequences of the anomalous expansion of water.
Original Khojo Papers practice question — not from a past board paper.
Answer
Because water is densest at 4 °C, in winter the coldest water stays at the top and freezes there while the water below remains at about 4 °C. This lets aquatic life survive under the ice, and it is also why water pipes burst when the water in them freezes and expands.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Water contracts on heating from 0 °C to 4 °C and expands above 4 °C.
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