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MCQ 141: The first thermos was patented by:

  1. Sir James Dewar
  2. Sir Etienne Montgolfier
  3. Sir Alfred Nobel
  4. Sir Henri Giffard

MCQ 142: Which one of the following invents the traffic lights with three colors?

  1. Sir William Potts
  2. Dr Dennis Colonello
  3. Dr Larry wang
  4. Sir Norman Rolston

MCQ 143: In which one of the following country Silver photo was discovered?

  1. France
  2. Netherlands
  3. Australia
  4. America

MCQ 144: Which one of the following is an inventor of Ballpoint?

  1. Sir Laszlo Biro
  2. Sir John J. Loud
  3. Sir Michael Faraday
  4. both a and b

MCQ 145: The first laser was invented by an American engineer named as:

  1. Sind ibn Ali
  2. Ibraim al Fazari
  3. Sir Theodore Maiman
  4. Sir Steven Sasson

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