Competititve Exams Materials
(Q) Who invented the telephone ?
A) Nikola Tesla
B) Thomas Edison
C) Alexander Graham Bell
D) Guglielmo Marconi
Explanation : Alexander Graham Bell is credited with inventing the first practical telephone in 1876.
B) Thomas Edison
C) Alexander Graham Bell
D) Guglielmo Marconi
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C) Alexander Graham BellExplanation : Alexander Graham Bell is credited with inventing the first practical telephone in 1876.
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Alexander Graham Bell, Inventions and Discoveries(Q) Who discovered the radioactive element radium ?
A) Ernest Rutherford
B) Wilhelm Röntgen
C) Marie Curie
D) Niels Bohr
Explanation : Marie Curie and her husband Pierre Curie discovered the radioactive elements radium and polonium in 1898.
B) Wilhelm Röntgen
C) Marie Curie
D) Niels Bohr
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C) Marie CurieExplanation : Marie Curie and her husband Pierre Curie discovered the radioactive elements radium and polonium in 1898.
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Inventions and Discoveries, Marie Curie(Q) In which year was the CRISPR-Cas9 gene-editing tool first developed ?
A) 2010
B) 2012
C) 2014
D) 2016
Explanation : The CRISPR-Cas9 gene-editing tool was first developed in 2012 by researchers Jennifer Doudna and Emmanuelle Charpentier.
B) 2012
C) 2014
D) 2016
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B) 2012Explanation : The CRISPR-Cas9 gene-editing tool was first developed in 2012 by researchers Jennifer Doudna and Emmanuelle Charpentier.
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Inventions and Discoveries(Q) Who invented the World’s first electric battery ?
A) Benjamin Franklin
B) Alessandro Volta
C) Michael Faraday
D) Thomas Edison
Explanation : Alessandro Volta invented the first electric battery, known as the Voltaic Pile, in 1800.
B) Alessandro Volta
C) Michael Faraday
D) Thomas Edison
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B) Alessandro VoltaExplanation : Alessandro Volta invented the first electric battery, known as the Voltaic Pile, in 1800.
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Inventions and Discoveries(Q) Which scientist discovered the law of universal gravitation ?
A) Albert Einstein
B) Galileo Galilei
C) Isaac Newton
D) Johannes Kepler
Explanation : Isaac Newton formulated the law of universal gravitation in 1687, explaining the attraction between objects with mass.
B) Galileo Galilei
C) Isaac Newton
D) Johannes Kepler
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C) Isaac NewtonExplanation : Isaac Newton formulated the law of universal gravitation in 1687, explaining the attraction between objects with mass.
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Inventions and Discoveries, Isaac Newton(Q) When was Wi-Fi technology first introduced ?
A) 1985
B) 1990
C) 1997
D) 2002
Explanation : Wi-Fi technology was first introduced in 1997, based on the IEEE 802.11 standard for wireless communication.
B) 1990
C) 1997
D) 2002
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C) 1997Explanation : Wi-Fi technology was first introduced in 1997, based on the IEEE 802.11 standard for wireless communication.
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Inventions and Discoveries(Q) Who is credited with the discovery of the planet Neptune ?
A) Galileo Galilei
B) Isaac Newton
C) Johann Galle
D) William Herschel
Explanation : Johann Galle discovered Neptune on September 23, 1846, using mathematical predictions by Urbain Le Verrier.
B) Isaac Newton
C) Johann Galle
D) William Herschel
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C) Johann GalleExplanation : Johann Galle discovered Neptune on September 23, 1846, using mathematical predictions by Urbain Le Verrier.
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Inventions and Discoveries
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