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Chemistry (Part-XV)

📆 May 23, 2025

Total Questions: 39

21. Who among the following discovered Radium? [S.S.C. Online MTS (T-I) 20.09.2017 (Shift-I) ]

Correct Answer: (a) Marie Curie
Solution:Marie Skłodowska Curie (along with her husband Pierre Curie) is famously credited with the discovery of the elements Radium (Ra) and Polonium (Po) in 1898. They isolated these radioactive elements from pitchblende, an ore. Marie Curie's groundbreaking work in radioactivity earned her a Nobel Prize in Physics (shared with Pierre Curie and Henri Becquerel) in 1903 and a Nobel Prize in Chemistry (solely) in 1911.

22. Who among the following scientists invented Kevlar? [S.S.C. Online Graduate Level (T-I) 6.03.2020 (Shift-III) ]

Correct Answer: (d) Stephanie Louise Kwolek
Solution:Stephanie Louise Kwolek (1923-2014) was an American chemist at DuPont who invented Kevlar in 1965. Kevlar is a heat-resistant and strong synthetic fiber, known for its high strength-to-weight ratio, making it five times stronger than steel on an equal weight basis. It is widely used in bulletproof vests, body armor, bicycle tires, and other applications requiring high strength and durability.

23. William Crookes was a physical chemist who discovered and named the element _____ . [S.S.C. Online Graduate Level (T-I) 7.06.2019 (Shift-II) ]

Correct Answer: (b) Thallium
Solution:Sir William Crookes (1832-1919) was a British chemist and physicist. He is best known for his pioneering work in vacuum tubes, which led to the invention of the Crookes tube. In chemistry, he is credited with the discovery of the element Thallium (Tl) in 1861, which he named after the Greek word "thallos," meaning a green shoot, referring to the bright green line in its spectrum.

24. ______ was the first person to isolate Methane gas. He discovered that Methane mixed with air could be exploded using an electric spark. [S.S.C. Online Graduate Level (T-I) 7.06.2019 (Shift-III) ]

Correct Answer: (b) Alessandro Volta
Solution:Alessandro Volta (1745-1827), an Italian physicist, is credited with discovering and isolating methane () gas in 1776 from the sediment of Lake Maggiore. He conducted experiments demonstrating its flammability and explosive properties when mixed with air and ignited by an electric spark, leading to his invention of the "Voltaic Pistol." He is also famous for inventing the electric battery (the voltaic pile).

25. Who invented the atomic battery in 1912? [S.S.C. Online Graduate Level (T-I) 7.06.2019 (Shift-III) ]

Correct Answer: (c) Henry Moseley
Solution:The atomic battery was invented by Henry Moseley. It is a device in which electricity is produced by the decay of radioactive material. They are used in places where an uninterrupted power supply is required. Such as in spacecraft, pacemakers, and submerged instruments.

Note-It is worth mentioning that the question mentions the invention of the atomic battery in the year 1912, whereas according to the available sources the invention of the atomic battery is considered to be in the year 1913.

26. Who among the following discovered electron? [S.S.C. Online C.P.O.S.I. (T-I) 3.07.2017 (Shift-II) ]

Correct Answer: (c) J.J. Thomson
Solution:The scientist who discovered the electron was J. J. Thomson in 1897. The electron is a negatively charged (1.6 × 10⁻¹⁹ coulomb) particle. JJ Thomson was awarded the 1906 Nobel Prize in Physics for his discovery of the electron.

27. Electron was discovered in the year 1897 by ______ . [S.S.C. Online Graduate Level (T-I) 7.06.2019 (Shift-II) ]

Correct Answer: (a) J.J. Thomson
Solution:The scientist who discovered the electron was J. J. Thomson in 1897. The electron is a negatively charged (1.6 × 10⁻¹⁹ coulomb) particle. JJ Thomson was awarded the 1906 Nobel Prize in Physics for his discovery of the electron.

28. J.J. Thomson received the Nobel Prize in Physics for the discovery of ______ . [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-I) ]

Correct Answer: (a) electrons
Solution:The scientist who discovered the electron was J. J. Thomson in 1897. The electron is a negatively charged (1.6 × 10⁻¹⁹ coulomb) particle. JJ Thomson was awarded the 1906 Nobel Prize in Physics for his discovery of the electron.

29. Who among the following is credited with the discovery of Neutrons? [S.S.C. Online CHSL (T-I) 14.10.2020 (Shift-II) ]

Correct Answer: (b) J. Chadwick
Solution:Sir James Chadwick (1891-1974) was a British physicist who is credited with the discovery of the neutron in 1932. His discovery provided a complete picture of the atomic nucleus, which was then understood to consist of protons and neutrons. He received the Nobel Prize in Physics in 1935 for this discovery.

30. Who discovered the neutron?

Correct Answer: (b) James Chadwick
Solution:Sir James Chadwick (1891-1974) was a British physicist who is credited with the discovery of the neutron in 1932. His discovery provided a complete picture of the atomic nucleus, which was then understood to consist of protons and neutrons. He received the Nobel Prize in Physics in 1935 for this discovery.
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