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41. Safety pin was an invention of:
  A.  Roentgen
  B.  C. Sholes
  C.  G. Claude
  D.  Walter Hunt
     
   
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42. Steam engine (piston) was invented in 1712 by:
  A.  Richard Gatling
  B.  K. G Gillette
  C.  Thomas Newcome
  D.  G. Marconi
     
   
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43. Who invented the periodic table in 1888:
  A.  J J Thomson
  B.  Mandeleev
  C.  A.L Lumiere
  D.  Michael Faraday
     
   
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44. Who invented Ship (steam) and Ship (turbine) in 1775 and 1894 respectively?
  A.  J.C Perier & Sir Charles Parsons
  B.  Hsing and Ling-Tsan
  C.  Neil Bohr and Rutherford
  D.  Jacques and Joseph Montgolfier
     
   
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45. In 1878, David Hughes of USA invented:
  A.  Tyre
  B.  Aeroplane
  C.  Machine gun
  D.  Microphone
     
   
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46. Who invented sweing machine?
  A.  Hans Lippershey
  B.  B. Thimmonnier
  C.  W. L Judson
  D.  W. Sturgeon
     
   
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47. Sir Frank Whittle is known for which of the following invention?
  A.  Safety Razor
  B.  Rayon
  C.  Jet Engine
  D.  Steam engine
     
   
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48. Machine gun was invented in 1861 by:
  A.  Richard Gatling
  B.  Daniel Gabriel
  C.  W. H. Carothers
  D.  Richard Trevithick
     
   
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49. Who invented electromagnet in 1824?
  A.  J. E. Lurdstrom
  B.  W. Sturgeon
  C.  Samuel Colt
  D.  Max Plank
     
   
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50. Madam Curie is known for inventing:
  A.  Radioactivity
  B.  Electron
  C.  Radium
  D.  Nuclear Reactor
     
   
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