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Inventions and Discoveries


19. 

Penicillin was discovered by

Answer : B. Alexander Fleming

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20. 

The carbon filament is invented by

Answer : D. Edison

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21. 

Who is the father of discoveries

Answer : D. Archimedes

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22. 

Recording of sound on tapes was first invented by

Answer : C. Poulsen

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23. 

Electrons were discovered by

Answer : D. J.J.Thomson

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24. 

who discovered the principle of lever?

Answer : B. Archimedes

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