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
111
Who discovered the cell (in biology)?
Answer:
Robert Hooke
Robert Hooke discovered cells in 1665 while observing cork under a microscope, coining the term 'cell' because they looked like monk's cells.
112
Who is credited with inventing the microscope?
Answer:
Zacharias Janssen
Zacharias Janssen, a Dutch spectacle maker, is generally associated with the invention of the first compound microscope around 1590.
113
Who invented the lightning rod?
Answer:
Benjamin Franklin
Benjamin Franklin invented the lightning rod in the mid-18th century to protect buildings from lightning strikes.
114
Who invented the ballpoint pen?
Answer:
László Bíró
László Bíró, a Hungarian journalist, invented the modern ballpoint pen to solve the problem of smudging ink.
115
Who discovered the nucleus of the atom?
Answer:
Ernest Rutherford
Rutherford discovered the atomic nucleus in 1911 through his famous gold foil experiment.
116
Who invented the computer mouse?
Answer:
Douglas Engelbart
Douglas Engelbart invented the computer mouse in the 1960s, revolutionizing how humans interact with computers.
117
Who invented the microwave oven?
Answer:
Percy Spencer
Percy Spencer accidentally discovered that microwaves could cook food when a candy bar melted in his pocket while he was working on a radar set.
118
Who invented the first working laser?
Answer:
Theodore Maiman
Theodore Maiman fired the first functioning laser (using a ruby crystal) in 1960 at Hughes Research Laboratories.
119
Who developed the theory of evolution by natural selection?
Answer:
Charles Darwin
Charles Darwin published 'On the Origin of Species' in 1859, proposing that species evolve over time through natural selection.
120
Who invented the stethoscope?
Answer:
René Laennec
René Laennec invented the stethoscope in 1816 because he was uncomfortable placing his ear directly on a patient's chest.