Inventions and Discoveries MCQs with Answers and Explanations

Question #41

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The invention of the jet engine is attributed to which British engineer?

A. Hans von Ohain

B. Frank Whittle

C. Christopher Cockerell

D. James Dyson

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Correct Answer: Option B

Explanation:
Sir Frank Whittle submitted the first patent for a turbojet engine in 1930, though Germany's Hans von Ohain built the first operational jet plane independently later.

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Question #42

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Who discovered the mathematical value and formula for the Universal Gravitational Constant ($G$) using a torsion balance?

A. Albert Einstein

B. Isaac Newton

C. Henry Cavendish

D. Robert Hooke

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Correct Answer: Option C

Explanation:
Henry Cavendish measured the density of the Earth and effectively calculated the value of the gravitational constant $G$ in 1798.

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Question #43

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The process of pasteurization to destroy harmful microbes in milk and wine was developed by whom?

A. Robert Koch

B. Alexander Fleming

C. Louis Pasteur

D. Joseph Lister

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Correct Answer: Option C

Explanation:
French chemist Louis Pasteur developed the heating process known as pasteurization in the 1860s.

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Question #44

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Who is the inventor of the Richter Scale used to measure the magnitude of earthquakes?

A. James Hutton

B. Charles Richter

C. Giuseppe Mercalli

D. Alfred Wegener

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Correct Answer: Option B

Explanation:
Charles F. Richter developed the Richter magnitude scale in 1935 in partnership with Beno Gutenberg.

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Question #45

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Who discovered the law of electromagnetic induction in 1831?

A. Heinrich Hertz

B. Hans Christian Ørsted

C. Michael Faraday

D. James Clerk Maxwell

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Correct Answer: Option C

Explanation:
Michael Faraday discovered electromagnetic induction, leading to the development of electric generators and transformers.

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Question #46

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The barometers, used to measure atmospheric pressure, was invented by whom?

A. Otto von Guericke

B. Evangelista Torricelli

C. Robert Boyle

D. Blaise Pascal

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Correct Answer: Option B

Explanation:
Evangelista Torricelli, an Italian physicist, invented the mercury barometer in 1643.

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Question #47

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Who invented the first commercially practical incandescent light bulb in 1879?

A. Humphry Davy

B. Thomas Edison

C. Nikola Tesla

D. Joseph Swan

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Correct Answer: Option B

Explanation:
Thomas Alva Edison developed a fully practical carbon-filament incandescent lamp and public power utility system.

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Question #48

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The discovery of the Raman Effect, which won the Nobel Prize in Physics in 1930, was made by whom?

A. Jagadish Chandra Bose

B. Homi J. Bhabha

C. C.V. Raman

D. Satyendra Nath Bose

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Correct Answer: Option C

Explanation:
Sir Chandrasekhara Venkata Raman discovered the inelastic scattering of light, known as the Raman Effect, on February 28, 1928.

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Question #49

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Who is credited with the invention of the telephone in 1876?

A. Guglielmo Marconi

B. Elisha Gray

C. Thomas Edison

D. Alexander Graham Bell

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Correct Answer: Option D

Explanation:
Alexander Graham Bell received the first US patent for the telephone in March 1876.

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Question #50

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The term 'vitamin' was coined by which biochemist in 1912?

A. Louis Pasteur

B. Robert Koch

C. Frederick Hopkins

D. Casimir Funk

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Correct Answer: Option D

Explanation:
Polish biochemist Casimir Funk coined the term 'vitamine' (later shortened to vitamin) to describe vital amine nutrients.

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Question #51

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Who discovered Hydrogen gas, which he called 'inflammable air'?

A. Joseph Priestley

B. John Dalton

C. Antoine Lavoisier

D. Henry Cavendish

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Correct Answer: Option D

Explanation:
Henry Cavendish isolated hydrogen gas in 1766 and recognized it as a discrete substance.

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Question #52

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Who invented the electrocardiogram (ECG/EKG) device, winning a Nobel Prize in 1924?

A. Willem Einthoven

B. Alexander Fleming

C. Hans Berger

D. Robert Koch

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Correct Answer: Option A

Explanation:
Willem Einthoven invented the first practical electrocardiogram in 1903 and received the Nobel Prize for it.

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Question #53

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The first modern steam locomotive, 'Rocket', was built by which engineer?

A. James Watt

B. Thomas Newcomen

C. George Stephenson

D. Richard Trevithick

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Correct Answer: Option C

Explanation:
George Stephenson and his son Robert built the 'Rocket' in 1829, setting the standard for future steam railways.

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Question #54

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Who discovered the principles of vaccination, microbial fermentation, and pasteurization?

A. Edward Jenner

B. Antonie van Leeuwenhoek

C. Robert Koch

D. Louis Pasteur

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Correct Answer: Option D

Explanation:
Louis Pasteur's extensive contributions include vaccines for rabies and anthrax, pasteurization, and germ theory breakthroughs.

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Question #55

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Who invented the lightning conductor in America?

A. Nikola Tesla

B. Thomas Edison

C. Benjamin Franklin

D. Michael Faraday

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Correct Answer: Option C

Explanation:
Benjamin Franklin invented the lightning rod to protect structures from catastrophic lightning strikes.

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Question #56

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The structure of benzene ring ($C_6H_6$) was discovered by which chemist?

A. Antoine Lavoisier

B. Friedrich August Kekulé

C. Dmitri Mendeleev

D. Robert Boyle

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Correct Answer: Option B

Explanation:
Friedrich August Kekulé discovered the ring structure of benzene after famously having a daydream of a snake biting its own tail.

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Question #57

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Who invented the first mechanical computer, known as the 'Difference Engine'?

A. Charles Babbage

B. Blaise Pascal

C. Alan Turing

D. John von Neumann

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Correct Answer: Option A

Explanation:
Charles Babbage designed the Difference Engine and the Analytical Engine, earning him the title 'Father of the Computer'.

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Question #58

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Who discovered Nitrogen element in 1772?

A. Henry Cavendish

B. Carl Wilhelm Scheele

C. Daniel Rutherford

D. Joseph Priestley

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Correct Answer: Option C

Explanation:
Scottish physician Daniel Rutherford isolated nitrogen in 1772, calling it 'noxious air'.

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Question #59

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The Crescograph, a device to measure the growth and response of plants, was invented by whom?

A. Prafulla Chandra Ray

B. C.V. Raman

C. Jagadish Chandra Bose

D. Birbal Sahni

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Correct Answer: Option C

Explanation:
Sir Jagadish Chandra Bose invented the crescograph in the early 20th century to prove that plants have feelings and react to stimuli.

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Question #60

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Who discovered the link between electricity and magnetism by observing a compass needle deflect near a current-carrying wire in 1820?

A. André-Marie Ampère

B. Hans Christian Ørsted

C. Michael Faraday

D. James Clerk Maxwell

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Correct Answer: Option B

Explanation:
Hans Christian Ørsted discovered electromagnetism when he noticed an electric current deflected a magnetic compass needle.

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