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Class 10 Science Chapter 10: The Human Eye and the Colourful World Assertion-reason questions with answers

2 assertion-reason questions on The Human Eye and the Colourful World, each with its answer and the reason, written from the NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter. Each question gives an Assertion (A) and a Reason (R); choose how they stand to each other.

Question 1
Assertion (A): Danger signal lights on railway tracks are red. Reason (R): Red light is scattered the least by fog or smoke.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.

Both are true. Because red is scattered least by fog or smoke, it reaches a distant observer in the same colour, which is exactly why danger signals are red.

Question 2
Assertion (A): A rainbow is a natural spectrum seen in the sky. Reason (R): Isaac Newton was the first to use a glass prism to obtain the spectrum of sunlight.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Both are true, but Newton's prism experiment does not explain how a rainbow forms; a rainbow is caused by dispersion of sunlight by water droplets in the atmosphere.

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