Same chapter3 marksDifficulty: Medium
Why does a rainbow form after rain?
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3 marksDifficulty: Medium
State two properties of ultraviolet radiation and one of its harmful effects.
Original Khojo Papers practice question — not from a past board paper.
Answer
Ultraviolet radiation causes certain substances to fluoresce and it affects a photographic plate; it also causes the skin to produce vitamin D. In excess it damages the skin and can cause skin cancer, and it harms the eyes.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Most of the sun's ultraviolet radiation is absorbed by the ozone layer.
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