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Q:

Who invented Bifocal Lens?

A) John Adams B) Benjamin Franklin
C) James Madison D) Thomas Jefferson

Answer:   B) Benjamin Franklin



Explanation:

Benjamin Franklin has long been credited with the invention of bifocal lenses and he was the first to wear bifocal lenses. He did not produce them himself but instead had some optician in London or France make them for him to overcome Presbyopia, a condition that Franklin suffered. He was tired switching between lenses for far and near sightedness. And that resulted in inventing Bifocal Lenses.

Subject: Inventions
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Q:

Who discovered benzene?

A) Hal Anger B) Michael Faraday
C) Bruce Ames D) Nicolas Appert
 
Answer & Explanation Answer: B) Michael Faraday

Explanation:
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Q:

Who invented logarithms?

A) Eden Snowden B) Larry Page
C) Thomas Edison D) John Napier
 
Answer & Explanation Answer: D) John Napier

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Q:

Who invented the vacuum pump?

A) Otto von Guericke B) Cai Lun
C) Melitta Bentz D) William Henry Fox Talbot
 
Answer & Explanation Answer: A) Otto von Guericke

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Q:

Who invented bluetooth?

A) Kirkpatrick Macmillan B) Benjamin Franklin
C) Dr. Jaap Haartsen D) Charles Babbage
 
Answer & Explanation Answer: C) Dr. Jaap Haartsen

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Q:

Who discovered the colour photography?

A) Robert Noyce B) Enrico Fermi
C) John Logie Baird D) James Clerk Maxwell
 
Answer & Explanation Answer: D) James Clerk Maxwell

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Q:

Who invented the electrocardiogram (ECG)?

A) Willem Einthoven B) Edward Jenner
C) Antonio de Ulloa and Charles Wood D) Karl Benz
 
Answer & Explanation Answer: A) Willem Einthoven

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Q:

Who discovered Sodium?

A) Humphry Davy B) William Henry Fox
C) J.J.Thomson D) Karl Benz
 
Answer & Explanation Answer: A) Humphry Davy

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Q:

Who invented the waterproof raincoat?

A) Robert Hooke B) Cai Lun
C) Charles Macintosh D) William Harvey
 
Answer & Explanation Answer: C) Charles Macintosh

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