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Inventions MCQs – Certification Test 570

Metal Detectors MCQs (Question 570) – Study App & e-Book Download

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MCQ 570: Metal detectors were invented by an American scientist and engineer named as:

  1. Sir Nikolaus Otto
  2. Sir Schuyler Skaats Wheeler
  3. Sir Alexander Graham Bell
  4. Sir Oliver Evans
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8th Class Science Test Questions

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