A light year means

A. a unit of time

B. a unit of length

C. a year of no consequence

D. illumination throughout the year

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  1. We always see only one side of the moon because
  2. A timer in a race is at the finish line. He should start his stop watch
  3. The instrument used to measure atmospheric pressure is
  4. The velocity required to place a vehicle in orbit round the moon is _________ that required to place…
  5. In a river, the currents are fastest where the river la
  6. The radius of an atom is approximately
  7. The light from the star nearest to the sun reaches the earth in
  8. Dioptre is the unit of power of
  9. The focal length or lens or the eye is under the control or the
  10. The evaporation rate depends on
  11. The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications…
  12. The frequency of an ultrasonic wave is
  13. The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the…
  14. A person cups his hand around the mouth when shouting. Why?
  15. Out of the following which is an insulator?
  16. Which part of the eye photographic camera?
  17. Out of the following which element has the longest half-life period?
  18. The ozone layer absorbs
  19. Thick brick walls are used in the construction or a cold storage because bricks
  20. The principle of equivalence of mass and energy was established by
  21. Choose the scalar quantity from the following physical quantities
  22. Tea pots are highly polished
  23. The following are the atmospheric zones above the surface of the earth:A) Troposphere B) IonosphereC)…
  24. Cosmic rays are
  25. The radiator in a car serves to
  26. Warm air will hold more water vapour than cold air because
  27. A pressure gauge for fluids is called
  28. The first Indian Satellite launched from a Russian Cosmodrome on April 16, 1975 was named
  29. In a freezer ice cubes will be formed more quickly in trays made of
  30. The function of a ruse wire is