The invention of the common lead pencil using graphite strips encased in wooden cylinders was patented in its modern form by whom? MCQ with Answer and Explanation

The invention of the common lead pencil using graphite strips encased in wooden cylinders was patented in its modern form by whom?

A. Walter Hunt

B. John Loud

C. Nicolas-Jacques Conté

D. Lewis Waterman

Answer: Option C

Nicolas-Jacques Conté patented the process of mixing powdered graphite with clay and baking it to create modern pencil leads in 1795.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1 Report Error

Who discovered that light waves travel as transverse vibrations, contradicting the longitudinal wave model?

A. Christiaan Huygens

B. James Clerk Maxwell

C. Augustin-Jean Fresnel and Thomas Young

D. Isaac Newton

Correct Answer: Option C

Explanation:
Fresnel and Young demonstrated through polarization experiments that light waves propagate perpendicular to the direction of travel.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #2 Report Error

Who discovered the element Sodium through the process of electrolysis?

A. Michael Faraday

B. Antoine Lavoisier

C. Humphry Davy

D. Jöns Jacob Berzelius

Correct Answer: Option C

Explanation:
Sir Humphry Davy isolated sodium, potassium, calcium, and magnesium using electrolysis in the early 1800s.

This question belongs to: Static General Knowledge Inventions and Discoveries

Question #3 Report Error

Who discovered the exact value of the charge of an electron through the famous Oil-Drop Experiment?

A. Max Planck

B. J.J. Thomson

C. Ernest Rutherford

D. Robert Millikan

Correct Answer: Option D

Explanation:
Robert A. Millikan measured the elementary electric charge of electrons using balanced oil droplets in 1909.

This question belongs to: Static General Knowledge Inventions and Discoveries