6
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:

Which dynasty had its capital at Chittorgarh?

A) Chauhan B) Sisodia
C) Hada D) Rathor
 
Answer & Explanation Answer: B) Sisodia

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Q:

Who discovered radioactivity?

A) Max Planck B) James Clerk Maxwell
C) Henri Becquerel D) Heinrich Hertz
 
Answer & Explanation Answer: C) Henri Becquerel

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Q:

The first large scale electrical air conditioning was invented and used in 1902 by

A) Willis Carrier B) John Gorrie
C) Stuart Cramer D) H.H. Schultz
 
Answer & Explanation Answer: A) Willis Carrier

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Q:

Which of the following was the first antibiotic discovered by Alexander Fleming in 1928?

A) Penicillin B) Prontosil
C) Streptomycin D) Tetracyline
 
Answer & Explanation Answer: A) Penicillin

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Q:

Aaton Van Leewen Hock is famous for the discovery of ___.

A) Microscope B) Nylon
C) Laser D) Radio valve
 
Answer & Explanation Answer: A) Microscope

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Q:

Who invented the mouse of a computer?

A) John Backus B) Charles Babbage
C) Douglas Engelbart D) Simon Colton
 
Answer & Explanation Answer: C) Douglas Engelbart

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Q:

Who invented the pendulum clock?

A) Galileo Galilei B) Christiaan Huygens
C) Frederick Jones D) Davidson
 
Answer & Explanation Answer: B) Christiaan Huygens

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Q:

Stainless steel was invented by

A) William Howard Livens B) Joseph Aspdin
C) Harry Brearley D) James Dyson
 
Answer & Explanation Answer: C) Harry Brearley

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