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Inventions MCQs – Certification Test 141

Dewar Flask Notes (Question 141) – App & e-Book Download

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MCQ: 141

The first thermos was patented by

  1. Sir James Dewar
  2. Sir Etienne Montgolfier
  3. Sir Alfred Nobel
  4. Sir Henri Giffard
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Dewar Flask Notes App (iOS & Android)

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General Knowledge Notes App

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8th Class Science Test Questions

8th Class Science Quiz with Answers