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Railways PYQCBT 1 2016

RRB NTPC · Question 97

Light can travel ______ km in a year. A. 5 billion B. 10 billion C. 5 trillion D. 10 trillion

  1. B

  2. C

  3. D

  4. A

Show answer & explanation

Answer: (C) D

Explanation

Light travels about 3 × 10⁵ km/s, and a year has about 3.15 × 10⁷ seconds, so in a year light covers about 9.46 × 10¹² km. This distance, one light-year, is roughly 10 trillion km.