NCERT Class X Science Class: Chapter – 11. Human Eye and Colourful World – Part-3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 8:

Which of the following statements is correct regarding the propagation of light of different colors of white light in air?

(a) Red light moves fastest

(b) Blue light moves faster than green light

(c) All the colors of the white light move with the same speed

(d) Yellow light moves with the mean speed as that of the red and the violet light

Answer: C

Image Light of Different Colors of White Light in Air

Question 9:

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colors, the red light

(a) Is scattered the most by smoke or fog

(b) Is scattered the least by smoke or fog

(c) Is absorbed the most by smoke or fog

(d) Moves fastest in air

Answer: B

FImage White Light is Scattered in All Direction

Question 10:

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

(a) Dispersion of light

(b) Scattering of light

(c) Total internal reflection of light

(d) Reflection of light from the earth

Answer: B

Image Scattering of Light

Question 11:

The bluish colour of water in deep sea is due to

(a) The presence of algae and other plants found in water

(b) Reflection of sky in water

(c) Scattering of light

(d) Absorption of light by the sea

Answer: C

Image Bluish Colour of Water in Deep Sea is Due To