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31. T. A Edison of USA is known for the following invention in 1804?
  A.  Gramophone
  B.  Zip fastener
  C.  Gas lighting
  D.  Clock
     
   
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32. Thermometer was invented in 1714 by:
  A.  Richard Gatling
  B.  G. Marconi
  C.  Albert Einstein
  D.  Daniel Gabriel Farhrenheit
     
   
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33. Electric lamp is an invention of Thomas Alva Edison while Diode Bulb was invented by:
  A.  Jacques and Joseph Montgolfier
  B.  Sir J. S. Fleming
  C.  Hsing and Ling-Tsan
  D.  Friese-Greene
     
   
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34. Radar was invented in 1922 in USA by:
  A.  K. Macmillan
  B.  David Hughes
  C.  Dr A. H Taylor and L.C Young
  D.  Rudolf Diesel
     
   
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35. Marie and Pierre Curie are known for the invention of:
  A.  Radioactivity
  B.  Radium
  C.  Dynamite
  D.  Photography
     
   
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36. Printing press was invented in Germany in 1455 by:
  A.  J. Gutenberg
  B.  Martin Kooper
  C.  John Logie Bared
  D.  John Dalton
     
   
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37. Samuel Colt of USA invented:
  A.  Atom bomb
  B.  Gas lighting
  C.  Radioactivity
  D.  Revolver
     
   
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38. In 1919, scooter was invented in England by:
  A.  Alessandro Volta
  B.  Marconi
  C.  G. Bradshaw
  D.  C. Hugyens
     
   
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39. Vulcanized rubber was invented by:
  A.  Charles Goodyear
  B.  Mandeleev
  C.  Sir Frank Whittle
  D.  W. H. Fox Tablot
     
   
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40. Nuclear Reactor invented in 1942 by:
  A.  J. Froelich
  B.  Karl Benz
  C.  Pascal
  D.  Anrico Fermi
     
   
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