The Cact that the compass needle does not point true north was observed first by

A. Sir Isaac Newton

B. Columbus

C. Archimedes

D. Thomas Alva Edison

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

You can do it
  1. When a ship floats on water, the weight or water displaced is
  2. The tiniest of the stars belong to the group known as
  3. The plants in a greenhouse are enclosed in a glass enclosure because
  4. We see the sun before it actually rises on the horizon. This is due to
  5. Isotones are species of atoms containing
  6. In a refrigerator cooling is produced by
  7. The completely dark portion of a shadow of an object is known as
  8. In the nucleus of an atom, the uncharged particle is
  9. Warm air will hold more water vapour than cold air because
  10. Rays from the headlight of a motor car are rendered parallel by suitably using
  11. A lactometer la used to
  12. A hydraulic brake in an automobile uses
  13. The electroplating of a metallic article
  14. Diamond shines because of its
  15. The maximum displacement of the particle in a mechanical wave motion is known as
  16. Where does the centre of gravity of a rubber ring lie?
  17. The hygrometer is an apparatus used for finding the
  18. The attraction between similar molecules is called
  19. A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point…
  20. Atoms which have the same atomic number but different mass numbers are called
  21. A bullet is fired at a certain angle with the horizontal. Its path will be
  22. The cell that can be recharged, after it has run down, by passing a direct current through it from a…
  23. Before the invention of geostationary satellites, television stations could not transmit their programmes…
  24. We always see only one side of the moon because
  25. Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because
  26. The first Indian Satellite launched from a Russian Cosmodrome on April 16, 1975 was named
  27. The mode of travel of heat energy from the sun across the empty space beyond the earth's atmosphere…
  28. A person cups his hand around the mouth when shouting. Why?
  29. The velocity of sound in a medium is
  30. During thunder storm you are travelling in a car. To protect yourself from the lightning you will have…