Directions for: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following five responses A. If both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion. B. If both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion. C. If the Assertion is true but the Reason is false. D. If both the Assertion and the Reason are false. E. If Assertion is false but Reason is true.
Assertion: Sky appears blue colour. Reason: Colloidal particles of dust scatter blue light.A) A
B) B
C) C
D) D
E) E
Correct Answer: A
Solution :
The sky appears blue because of scattering of sunlight by the colloidal particles of air (dust, dirt etc.) this effect of scattering of light by colloidal particles is called Tyndall effect.
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