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
71
Who invented the first synthetic plastic (Bakelite)?
Answer:
Leo Baekeland
Leo Baekeland invented Bakelite in 1907, the first plastic made from synthetic components.
72
Who discovered the nature of the chemical bond (electronegativity)?
Answer:
Linus Pauling
Pauling applied quantum mechanics to chemistry to explain how atoms bond to form molecules.
73
Who invented the seed drill?
Answer:
Jethro Tull
Jethro Tull invented the mechanical seed drill in 1701, significantly improving agricultural efficiency.
74
Who discovered the neutron star?
Answer:
Jocelyn Bell Burnell
Jocelyn Bell Burnell discovered the first radio pulsars in 1967, which were later identified as rotating neutron stars.
75
Who discovered the four largest moons of Jupiter?
Answer:
Galileo Galilei
Galileo discovered Io, Europa, Ganymede, and Callisto in 1610, providing evidence against the geocentric model.
76
Who invented the first programmable loom (using punch cards)?
Answer:
Joseph Marie Jacquard
The Jacquard loom, invented in 1804, used punched cards to control the weaving of patterns, inspiring early computers.
77
Who discovered the positron (antimatter)?
Answer:
Carl Anderson
Carl Anderson discovered the positron in 1932 while studying cosmic ray tracks in a cloud chamber.
78
Who invented the safety lamp for miners?
Answer:
Humphry Davy
The Davy lamp, invented in 1815, allowed miners to work safely in the presence of flammable gases.
79
Who discovered the theory of electromagnetism?
Answer:
James Clerk Maxwell
Maxwell formulated the classical theory of electromagnetic radiation, bringing together electricity, magnetism, and light.
80
Who invented the Polaroid instant camera?
Answer:
Edwin Land
Edwin Land invented the instant camera, which could develop and produce a photo in under a minute, in 1948.