NCERT Class X Science Class: Chapter – 11. Human Eye and Colourful World – Part-2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 4:

At noon the sun appears white as

(a) Light is least scattered

(b) All the colors of the white light are scattered away

(c) Blue colour is scattered the most

(d) Red colour is scattered the most

Answer: A

Image Reddening of the Sun at Sunrise & Sunset

Question 5:

Which of the following phenomena of light are involved in the formation of a rainbow?

(a) Reflection, refraction and dispersion

(b) Refraction, dispersion and total internal reflection

(c) Refraction, dispersion and internal reflection

(d) Dispersion, scattering and total internal reflection

Answer: C

Image Refraction

Question 6:

Twinkling of stars is due to atmospheric

(a) Dispersion of light by water droplets

(b) Refraction of light by different layers of varying refractive indices

(c) Scattering of light by dust particles

(d) Internal reflection of light by clouds

Answer: B

Image Refraction of Light

Question 7:

The clear sky appears blue because

(a) Blue light gets absorbed in the atmosphere

(b) Ultraviolet radiations are absorbed in the atmosphere

(c) Violet and blue lights get scattered more than lights of all other colors by the atmosphere

(d) Light of all other colors is scattered more than the violet and blue colour lights by the atmosphere

Answer: C

Image Earth Sun Time Blue Lights & Violet