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
81
Who discovered the law of elasticity (Hooke's Law)?
Answer:
Robert Hooke
Robert Hooke discovered that the force needed to extend or compress a spring is proportional to that distance (F = -kx).
82
Who is credited with inventing the modern zipper?
Answer:
Gideon Sundback
While Whitcomb Judson had an earlier version, Gideon Sundback improved it into the modern interlocking zipper in 1913.
83
Who invented the phonograph?
Answer:
Thomas Edison
Thomas Edison invented the phonograph in 1877, the first machine capable of recording and reproducing sound.
84
Who discovered the expanding universe?
Answer:
Edwin Hubble
Edwin Hubble demonstrated in 1929 that galaxies are moving away from us, implying the universe is expanding.
85
Who invented the first battery-powered pacemaker?
Answer:
Wilson Greatbatch
Wilson Greatbatch invented the implantable cardiac pacemaker in 1958, accidentally using the wrong resistor in a circuit.
86
Who discovered the link between bacteria and disease (Germ Theory)?
Answer:
Louis Pasteur
Pasteur (along with Robert Koch) proved that microorganisms cause disease, fundamentally changing medicine.
87
Who invented the cotton gin?
Answer:
Eli Whitney
Eli Whitney invented the cotton gin in 1793, a machine that quickly separated cotton fibers from their seeds.
88
Who discovered the planet Uranus?
Answer:
William Herschel
Sir William Herschel discovered Uranus in 1781 using a telescope he built himself, expanding the known boundaries of the solar system.
89
Who invented the spinning jenny, a key development in the industrialization of weaving?
Answer:
James Hargreaves
James Hargreaves invented the spinning jenny in 1764, which allowed a worker to work eight or more spools at once.
90
Who is known for the discovery of the electron's charge (Oil Drop Experiment)?
Answer:
Robert Millikan
Robert Millikan determined the elementary charge of an electron with his famous oil drop experiment in 1909.