The discovery of the electrical conductivity properties of semi-conductive materials under specific doping was pioneered by whom? MCQ with Answer and Explanation

Question
The discovery of the electrical conductivity properties of semi-conductive materials under specific doping was pioneered by whom?
A. Thomas Edison
B. John Bardeen, Walter Brattain, and William Shockley
C. Nikola Tesla
D. Michael Faraday
Answer: Option B
Solution (By JKSSB Mock Tests)
These three physicists invented the point-contact solid-state transistor at Bell Labs in 1947, replacing vacuum tubes.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
The invention of the common mechanical office device known as the copy mimeograph machine was patented by whom?
A. Christopher Sholes
B. Chester Carlson
C. Thomas Edison
D. John Loud
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Correct Answer: Option C

Explanation:
Edison patented the stencil duplicating device in 1876, which Albert Dick later refined into the widespread commercial mimeograph.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered the process of nuclear fission in heavy elements, winning the Nobel Prize in Chemistry in 1944?
A. Enrico Fermi
B. Lise Meitner
C. Otto Hahn
D. Niels Bohr
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Correct Answer: Option C

Explanation:
German chemist Otto Hahn discovered nuclear fission of uranium in 1938 alongside Fritz Strassmann.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who discovered the biological presence of blood platelets and their exact role in physical blood coagulation?
A. Karl Landsteiner
B. Giulio Bizzozero
C. Marcello Malpighi
D. William Harvey
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Correct Answer: Option B

Explanation:
Italian pathologist Bizzozero identified blood platelets ('piastrine') in 1882, describing how they aggregate to plug damaged blood vessels.
This question belongs to: Static General Knowledge Inventions and Discoveries
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