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Science · 2025 · 2 marks
The Human Eye and the Colourful WorldScattering of Light and Tyndall Effect2 marksUnderstandvery short answer
CBSE 2025 · Region 6 · Set 1 · Q25
(a) Give reasons: (i) The sky appears dark to passengers flying at very high altitude. (ii) 'Danger' signal lights are red in colour.
(a)
Give reasons :
(i)
The sky appears dark to passengers flying at very high altitude.
(ii)
'Danger' signal lights are red in colour.
OR
(b)
What is a rainbow ? "We see a rainbow in the sky only after the rainfall." Why ?
Marking-scheme solution
(a) (i) Scattering of light is not prominent at such heights.
(ii) The red colour is least scattered by smoke or fog. / Red colour has longer wavelength.
OR
(b)
Rainbow is a natural spectrum appearing in the sky after a rain shower.
After rain, small water droplets act as a tiny prism, when light enters, it gets refracted and dispersed.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.