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Physics

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41. The principle of Dynamo was discovered by
 
  • A. Max Planck
  • B. Michael Faraday
  • C. Albert Einstein
  • D. Sir Humphrey Davy
 
42. Magnetism at the centre of a bar magnet is
 
  • A. maximum
  • B. minimum
  • C. zero
  • D. all the above
 
 
43. What do we call a substance which is repelled by a magnet?
 
  • A. paramagnetic
  • B. diamagnetic
  • C. ferromagentic
  • D. none of these
 
44. A device used for measuring the depth of the sea is called
 
  • A. manometer
  • B. fathometer
  • C. altimeter
  • D. hydrometer
 
45. The source of sun’s radium energy is
 
  • A. nuclear fusion
  • B. nuclear fission
  • C. magnetic traps
  • D. cosmic radiations