Who discovered the biological mechanism of vector cloning known as Polymerase Chain Reaction (PCR)? MCQ with Answer and Explanation

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Who discovered the biological mechanism of vector cloning known as Polymerase Chain Reaction (PCR)?

A. Kary Mullis

B. Alec Jeffreys

C. Francis Crick

D. James Watson

Answer: Option A

Solution (By JKSSB Mock Tests)

Kary Mullis conceived the thermal cycling enzyme replication process to rapidly amplify specific DNA strands in 1983.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Who invented the first operational hot air balloon, executing the first recorded human flight?

A. Wright Brothers

B. Count Ferdinand von Zeppelin

C. Montgolfier Brothers

D. Otto Lilienthal

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Correct Answer: Option C

Explanation:
Joseph-Michel and Jacques-Étienne Montgolfier developed and demonstrated the hot air balloon in France in 1783.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2

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Who invented the first practical alternating current (AC) motor and power transmission system?

A. Michael Faraday

B. Thomas Edison

C. George Westinghouse

D. Nikola Tesla

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Correct Answer: Option D

Explanation:
Nikola Tesla patented the AC induction motor and polyphase system, which revolutionized long-distance electrical grid power distribution.

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Question #3

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The invention of the mechanical calculating machine named 'Pascaline' in 1642 was completed by whom?

A. Charles Babbage

B. Blaise Pascal

C. Gottfried Wilhelm Leibniz

D. René Descartes

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Correct Answer: Option B

Explanation:
Blaise Pascal invented the Pascaline to assist his father, a tax commissioner, in performing arithmetic addition and subtraction.

This question belongs to: Static General Knowledge Inventions and Discoveries

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