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. Michael Faraday

C. Nikola Tesla

D. John Bardeen, Walter Brattain, and William Shockley

Answer: Option D

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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Who discovered that certain types of biological fungal spores prevent bacterial cell wall cross-linking, identifying Penicillin's mechanism?

A. Robert Koch

B. Howard Florey and Ernst Chain

C. Alexander Fleming

D. Louis Pasteur

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Correct Answer: Option B

Explanation:
While Fleming discovered penicillin, Florey and Chain isolated and purified the molecule for medical treatment, sharing the 1945 Nobel Prize.

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Question #2

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The invention of the common mechanical office stapler mechanism was popularized by which manufacturing developer?

A. George McGill and the Boston Wire Stitcher Company

B. Christopher Sholes

C. John Loud

D. Walter Hunt

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Correct Answer: Option A

Explanation:
McGill patented functional malleable brass paper fasteners, and industrial developers later automated magazine tracking feeds.

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Question #3

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Who discovered the citric acid cycle (also known as the Krebs cycle) in cellular respiration?

A. Louis Pasteur

B. Melvin Calvin

C. Hans Adolf Krebs

D. Arthur Kornberg

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Correct Answer: Option C

Explanation:
Hans Adolf Krebs discovered the metabolic pathway of energy conversion in cells in 1937, winning the Nobel Prize in 1953.

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