The invention of the common mechanical office typewriter spool ribbon reversal mechanism was patented by whom? MCQ with Answer and Explanation

The invention of the common mechanical office typewriter spool ribbon reversal mechanism was patented by whom?

A. John Pratt and Franz Xaver Wagner

B. John Loud

C. Walter Hunt

D. Christopher Sholes

Answer: Option A

Wagner patented the front-strike visibility layout and automated ribbon reversing wheels, which Underwood manufactured.

This question belongs to: Static General Knowledge Inventions and Discoveries

No comments yet. Be the first to start the discussion!

Question #1 Report Error

The invention of the carbon-14 dating technique to determine the age of organic materials was developed by whom?

A. Ernest Rutherford

B. Marie Curie

C. Willard Libby

D. Otto Hahn

Correct Answer: Option C

Explanation:
Willard Libby led the team that developed radiocarbon dating in 1949, winning the 1960 Nobel Prize in Chemistry.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2 Report Error

Who discovered that atomic structure configurations present discrete filling layers regulated by spin exclusion principles?

A. Erwin Schrödinger

B. Wolfgang Pauli

C. Niels Bohr

D. Werner Heisenberg

Correct Answer: Option B

Explanation:
The Pauli Exclusion Principle states that no two electrons in an atom can occupy the exact same quantum state simultaneously.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3 Report Error

The invention of the common chemical transformation layout known as the Solvay process optimized production of what?

A. Sulfuric Acid

B. Ammonia

C. Sodium Carbonate

D. Nitric Acid

Correct Answer: Option C

Explanation:
Ernest Solvay patented the ammoniacal brine method in 1861, replacing the more expensive Leblanc soda ash synthesis.

This question belongs to: Static General Knowledge Inventions and Discoveries