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We see the sun before it actually rises on the horizon. This is due to

A. refraction

B. reflection

C. total internal reflection

D. parallax

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  1. Skating on ice is possible because
  2. The device for tracking and locating the position of a moving object in space is called
  3. Halley's comet appears in the heavens once in
  4. A bolometer is used to measure
  5. When the earth reaches its perihelion
  6. When an electric apparatus is fitted with a three core flexible lead the insulation on the three wires…
  7. Out of the following which is an insulator?
  8. If an empty cylinder Is half ruled with a liquid, Its centre of gravity is
  9. The function of a moderator in a nuclear reactor is
  10. The scientist who first sent electromagnetic waves to distant places was
  11. Cosmic rays are
  12. A device used in a ship for the purpose of measuring the depth of the sea is
  13. The completely dark portion of a shadow of an object is known as
  14. Like magnetic poles
  15. The device that is used to measure the electromotive force of a cell is
  16. Stars twinkle because of
  17. Pieces of camphor placed on water move about rapidly. This is because of
  18. Every action has an equal and opposite reaction is Newton's law of Motion
  19. SONAR (Sound Navigation Ranging) is
  20. The electron has a mass equal to
  21. Electromagnets are used in
  22. The first Indian Satellite launched from a Russian Cosmodrome on April 16, 1975 was named
  23. The direction of heat flow between two objects depends on
  24. In a refrigerator cooling is produced by
  25. A workman was working on a rail track. A young boy at a distance holds his ear close to the railway…
  26. The enormous energy released in nuclear and thermonuclear reactions is due to conversion of
  27. Pyrometers are instruments used
  28. The air inside an electric, bulb is removed to prevent
  29. A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks…
  30. The strength of an electromagnet can be increased by