NCERT Exemplar IV — task. Science CBSE, Class 10.

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1. The clear sky appears blue because

light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
ultraviolet radiations are absorbed in the atmosphere
violet and blue lights get scattered more than lights of all other colours by the atmosphere
blue light gets absorbed in the atmosphere

2. Which of the following statements is correct regarding the propagation of light of different colours of white light in air?

Yellow light moves with the mean speed as that of the red and the violet light
Blue light moves faster than green light
All the colours of the white light move with the same speed
Red light moves fastest

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