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X-rays were discovered by

A. Wilhelm Roentgen

B. WO Coolidge

C. Henry Cavendish

D. William Watson

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  1. Which of the following apparatus is used in the electrolysis of water?
  2. Which is the densest planet of the solar system?
  3. The filament used in the electric lamp is made of
  4. A workman was working on a rail track. A young boy at a distance holds his ear close to the railway…
  5. The device used to record the sound is
  6. We always see only one side of the moon because
  7. Alternating Current (AC) is more advantageous than direct current because
  8. Antiparticle of electron is
  9. Atoms which have the same atomic number but different mass numbers are called
  10. Echoes are produced by
  11. At what temperature do the Fahrenheit and Celsius scales give the same reading?
  12. Pieces of camphor placed on water move about rapidly. This is because of
  13. The Milky Way is
  14. The unit of power in SI is
  15. A thermostat is a device used
  16. The sun continuously produces an enormous amount of energy. This la due to
  17. An electric kettle used for boiling hard water has a white scale deposited on its heating element. This…
  18. When a swing la drawn to a side Its potential energy In relation to the earth
  19. Under similar conditions of temperature and pressure, the velocity of sound is maximum in
  20. Separating particles from a suspension is effected by
  21. The temperature, surface features, length of days and nights of a planet depend on
  22. The electrical domestic tube light gives white fiourescent light because of
  23. Where does the centre of gravity of a rubber ring lie?
  24. A man Jumping out of a moving train is thrown
  25. The completely dark portion of a shadow of an object is known as
  26. A body has fallen from a height. Just before touching the pound it has
  27. The distance between two bodies is halved. Now the force of attraction between them will be
  28. A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and
  29. During thunder storm you are travelling in a car. To protect yourself from the lightning you will have…
  30. Sound travels fastest in