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Inventions MCQs – Certification Test 623

Vaccum Tube MCQ (Question 623) – Study App & e-Book Download

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MCQ 623: The first vacuum tube was invented by an English electrical engineer known as:

  1. Sir John Ambrose Fleming
  2. Dr Raymond Lemieux
  3. Sir Peter Williamson
  4. Sir Samuel Morse
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8th Class Science Test Questions

8th Class Science Quiz with Answers