General Knowledge MCQs
Topic Notes: General Knowledge
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
121
Who is credited with discovering Oxygen (independently)?
Answer:
Joseph Priestley
Joseph Priestley (along with Carl Wilhelm Scheele and Antoine Lavoisier) is credited with the discovery of oxygen in 1774.
122
Who invented the diesel engine?
Answer:
Rudolf Diesel
Rudolf Diesel invented the diesel engine in the 1890s, an internal combustion engine that uses the heat of compression to initiate ignition.
123
Who discovered the laws of planetary motion?
Answer:
Johannes Kepler
Kepler described the motion of planets around the Sun with three scientific laws, improving upon Copernicus' model.
124
Who invented the first practical radar system?
Answer:
Robert Watson-Watt
Sir Robert Watson-Watt developed the first practical radar system in the 1930s, which played a crucial role in World War II.
125
Who is credited with inventing the mercury thermometer?
Answer:
Daniel Gabriel Fahrenheit
Fahrenheit invented the mercury-in-glass thermometer in 1714 and developed the Fahrenheit temperature scale.
126
Who invented dynamite?
Answer:
Alfred Nobel
Alfred Nobel, the founder of the Nobel Prize, invented dynamite in 1867 as a safer alternative to unstable gunpowder and nitroglycerin.
127
Who discovered the electron?
Answer:
J.J. Thomson
J.J. Thomson discovered the electron in 1897 through his experiments with cathode ray tubes.
128
Who invented the mobile phone?
Answer:
Martin Cooper
Martin Cooper of Motorola made the first public call from a handheld mobile phone in 1973.
129
Who discovered the process of pasteurization?
Answer:
Louis Pasteur
Louis Pasteur discovered that heating liquids like milk and wine killed the bacteria inside them, preventing spoilage and disease.
130
Who is credited with the invention of the radio?
Answer:
Guglielmo Marconi
Marconi is generally credited with the invention of the radio for his development of a practical wireless telegraphy system.