A freely falling body exhibits which type of motion? MCQ with Answer and Explanation
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A bus travels the first 20 km at 40 km/h and the next 20 km at 60 km/h. Average speed is
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A lens which is thicker at center and thinner at edges is
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Assertion (A): Light year and astronomical unit both represent dimensions of length. Reason (R): Light year is the time taken by light to travel from the Sun to the Earth.
Correct Answer: Option D
Explanation:
Assertion (A) is true because both light year and astronomical unit (AU) are units used to measure massive astronomical distances (lengths). Reason (R) is false because a light year is the distance light travels in a vacuum in one Earth year, not the time taken to travel from the Sun to Earth (which is about 8.3 minutes).
Assertion (A) is true because both light year and astronomical unit (AU) are units used to measure massive astronomical distances (lengths). Reason (R) is false because a light year is the distance light travels in a vacuum in one Earth year, not the time taken to travel from the Sun to Earth (which is about 8.3 minutes).
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