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Science · 2026 · 3 marks
CBSE 2026 · Region 1 · Set 2 · Q37
(a) What is Tyndall effect? (b) What happens when sunlight is scattered from the particles of very large size? (c) 'Danger' signals are always red in…
(a)
What is Tyndall effect ?
(b)
What happens when sunlight is scattered from the particles of very large size ?
(c)
'Danger' signals are always red in colour. Why ?
Marking-scheme solution
(a) The phenomenon of scattering of light by colloidal particles which makes the path of light visible is called Tyndall effect.
(b) Scattered light may appear white. / Scattered light may appear of a colour of longer wavelength.
(c) Red colour is least scattered by fog or smoke, so it can be seen in the same colour from a large distance.
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.