OCS Prelims Exam 2023

  • Light Year: A light-year is a measurement of distance and not time (as the name might imply). A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles (9.7 trillion kilometers).
    • As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year (365.25 days).
  • Jet Fuel: It is used in turbine based aviation engines. It mainly contains kerosene.
  • Correct Order of Freezing of Water: Pure water > Tap water > Sea water.

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