11
Q:

Who Discovered The Nucleus of a Cell?

A) Otto Hahn B) John Dalton
C) Robert Brown D) Marie Curie

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.

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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