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MPSC State Service 2017 · GS · Question 54 of 100

A new unit of length is chosen such that the speed of light in a vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit, if light takes 8 minutes and 20 seconds to cover this distance?

Physics

  1. A820 units
  2. B500 unitsCorrect
  3. C1500 units
  4. D2460 units

Answer: B. 500 units

Explanation

Light takes 8 min 20 s = 500 s to reach Earth; with c = 1 unit/s the distance is 500 units.

Source: MPSC Rajyaseva Prelims 2017 GS Paper I (official paper)

← Q53View full paper (100 questions)Q55 →

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