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WBCS Preliminary Examination 2019 — General Studies · Question 105 of 200

Q105
General SciencePhysics
Light year is
  1. a.light emitted by sun in one year
  2. b.time taken by light to travel from Sun to Earth
  3. c.the distance travelled by light in free space in one year
  4. d.time taken by earth to go once around the Sun

Answer: (C) the distance travelled by light in free space in one year

A light-year is a unit of distance (not time), equal to the distance light travels through a vacuum in one Julian year — roughly $9.46 \times 10^{12}$ km — commonly used to express astronomical distances.

Q104 Whole paperQ106