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

Question
The invention of the common lead pencil using graphite strips encased in wooden cylinders was patented in its modern form by whom?
A. Nicolas-Jacques Conté
B. Lewis Waterman
C. John Loud
D. Walter Hunt
Answer: Option A
Solution (By JKSSB Mock Tests)
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
Who discovered the radioactive elements Radium and Polonium?
A. Henri Becquerel
B. Ernest Rutherford
C. Marie and Pierre Curie
D. Otto Hahn
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Correct Answer: Option C

Explanation:
Marie Skłodowska-Curie and her husband Pierre isolated polonium and radium from pitchblende ore in 1898.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who discovered the law of gas volume variations under changing pressures, known as the first gas law?
A. Joseph Louis Gay-Lussac
B. Jacques Charles
C. Robert Boyle
D. Amadeo Avogadro
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Correct Answer: Option C

Explanation:
Robert Boyle published Boyle's Law in 1662, establishing that pressure and volume of a gas are inversely proportional at constant temperature.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who discovered that the element Thorium is radioactive, independently of Marie Curie's tracking experiments?
A. Ernest Rutherford
B. Henri Becquerel
C. Otto Hahn
D. Gerhard Carl Schmidt
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Correct Answer: Option D

Explanation:
Gerhard Carl Schmidt discovered thorium's radioactivity in 1898, publishing his findings just weeks before Marie Curie.
This question belongs to: Static General Knowledge Inventions and Discoveries
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