CBSE Class 10 Science 2021 Term 1 Solved Paper

Direction for Question No. 31- 35

It consists of two statements - Assertion (A) and Reason (R). Answer these questions selecting the appropriate options given below:

Question : 34

Total: 60

Assertion (A): Sun appears reddish at the time of Sunrise and Sunset.
Reason (R): Distance travelled by sunlight in the atmosphere is lesser during sunrise and sunset as compared to noon.

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.

Solution:

Sunlight consists of seven colours. Of these, red has the maximum wavelength. During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red having shorter wavelength is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.

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