3
Q:

Who is often called the 'first African-American' inventor?

A) Bessie Blount B) George Washington Carver
C) Benjamin Banneker D) Elijah McCoy

Answer:   C) Benjamin Banneker



Explanation:
Subject: Inventions
Q:

When was the voting machine invented?

A) 1980 B) 1892
C) 1989 D) 1920
 
Answer & Explanation Answer: B) 1892

Explanation:
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Q:

Which is an invention that improved safety for railway passengers?

A) Air brakes B) Refrigerated rail cars
C) Time standardization D) Pullman sleeping cars
 
Answer & Explanation Answer: A) Air brakes

Explanation:

An invention that improved safety for railway passengers is Air brakes. With the use of air brakes using compressed air, become more effective by preventing many train accidents.

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Q:

The credit of inventing the television goes to

A) Philo Farnsworth, B) John Logie Baird
C) Philo Farnsworth D) None of the above
 
Answer & Explanation Answer: B) John Logie Baird

Explanation:

The_credit_of_inventing_television_goes_to1538375217.jpg image

The credit of inventing the television goes to John Logie Baird.

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0 213
Q:

Which famous scientist unknowingly founded the field of spectroscopy?

A) Issac Newton B) Galileo
C) Graham Bell D) None of the above
 
Answer & Explanation Answer: A) Issac Newton

Explanation:
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0 282
Q:

The cotton gin was an important invention because

Answer

Cotton Gin was invented by Eli Whitney in 1793, which is used to separate cotton seeds from cotton fiber.


 


Hence, it was an important invention because it dramatically reduced the amount of time it took to separate cotton seeds from cotton fiber.

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0 391
Q:

What two scientists established the structure of dna?

A) Rosalind Franklin and Maurice Wilkins B) James Watson and Francis Crick
C) Rosalind Franklin and Francis Crick D) James Watson and Maurice Wilkins
 
Answer & Explanation Answer: B) James Watson and Francis Crick

Explanation:

In the early 1950s two scientists, Rosalind Franklin and Maurice Wilkins, studied DNA using x-rays. Franklin produced an x-ray photograph that allowed two other researchers, James Watson and Francis Crick to work out the 3D structure of DNA. The structure of DNA was found to be a double helix.

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0 420
Q:

Who Discovered The Nucleus of a Cell?

A) Otto Hahn B) John Dalton
C) Robert Brown D) Marie Curie
 
Answer & Explanation Answer: C) Robert Brown

Explanation:

Robert Brown, Scottish botanist, Discovered The Nucleus of a Cell in 1831, London. When Brown was studying orchids under microscope when he observed an opaque area, which he called the "Areola" or "Nucleus", in the cells of the flower's outer layer.

The nucleus was also described by Franz Bauer in 1804 but in detail Robert Brown made it in 1831.

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Q:

Who invented Bifocal Lens?

A) John Adams B) Benjamin Franklin
C) James Madison D) Thomas Jefferson
 
Answer & Explanation 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.

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