1. Assertion : Smaller the orbit of the planet around the sun, shorter is the time it takes to complete one revolution. Reason : According to Kepler’s third law of planetary motion, square of time period is proportional to cube of mean distance from sun.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)       If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)        If assertion is true but reason is false.

(d)       If the assertion and reason both are false.

(e)       If assertion is false but reason is true.

Answer: a

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