Who discovered the law of conservation of mass in chemical reactions? MCQ with Answer and Explanation
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Question #1
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Who developed the first successful polio vaccine in 1955?
Correct Answer: Option C
Explanation:
Jonas Salk developed the first successful inactivated polio vaccine (IPV) in 1955, while Albert Sabin later developed the oral polio vaccine.
Jonas Salk developed the first successful inactivated polio vaccine (IPV) in 1955, while Albert Sabin later developed the oral polio vaccine.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #2
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Who invented the printing press with movable type around 1440?
Correct Answer: Option C
Explanation:
Johannes Gutenberg introduced movable-type printing to Europe, sparking the Printing Revolution.
Johannes Gutenberg introduced movable-type printing to Europe, sparking the Printing Revolution.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
Question #3
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Who discovered that the chemical element Boron is isolated by reacting boric acid with potassium metal?
Correct Answer: Option C
Explanation:
Gay-Lussac and Thénard independently isolated elemental boron in 1808, around the same time as Sir Humphry Davy.
Gay-Lussac and Thénard independently isolated elemental boron in 1808, around the same time as Sir Humphry Davy.
This question belongs to:
Static General Knowledge
Inventions and Discoveries
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