Class 8 MCQs From Inventions Textbook

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Inventions Placement Tests: Certification Test 570

Metal Detectors Study App & e-Book: MCQ 570

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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

8th Class Science Quiz with Answers