The speed of light is minimum while passing through

A. air

B. glass

C. vacuum

D. water

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  1. A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and
  2. The temperature, surface features, length of days and nights of a planet depend on
  3. A permanent magnet may be demagnetised by
  4. A car parked in the sun with its windows closed gets terribly hot inside. This is due to
  5. Sun spots are
  6. The phenomenon of radioactivity was discovered by
  7. We cannot see and without the aid of a telescope
  8. A man Jumping out of a moving train is thrown
  9. The filament used in the electric lamp is made of
  10. For accurate scientific work, temperatures are often measured by
  11. Raindrops assume a spherical shape because or
  12. The velocity required to place a vehicle in orbit round the moon is _________ that required to place…
  13. The line on earth's surface passing through the places having zero dip is called the magnetic equator.…
  14. Which metal is used in storage batteries?
  15. A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by…
  16. Photoelectric cell is a device which converts
  17. Drinks kept in a vacuum flask remain hot or cold as the case may be for a long time because
  18. Warm air will hold more water vapour than cold air because
  19. The electrical domestic tube light gives white fiourescent light because of
  20. The overhead wires supported by high towers in the grid system carry
  21. When a bowler spins a ball, it changes its direction in the air. This is due to
  22. To get 5 images of a single object one should have two plane mirrors inclined at an angle of
  23. Among the following the most suitable material for the core of an electro-magnet is
  24. The velocity of sound in a medium is
  25. A hydrogen bomb is based on
  26. In a refrigerator, the refrigerant is
  27. Which force is used when milk is churned to separate cream?
  28. X-rays are
  29. When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light…
  30. Powder clings to the skin because of