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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 colour. Why ?
(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 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.