Who discovered that atomic particle configurations include a heavy uncharged component, predicting the Neutron before its physical extraction? MCQ with Answer and Explanation

Question
Who discovered that atomic particle configurations include a heavy uncharged component, predicting the Neutron before its physical extraction?
A. Niels Bohr
B. J.J. Thomson
C. James Chadwick
D. Ernest Rutherford
Answer: Option D
Solution (By JKSSB Mock Tests)
Rutherford postulated the existence of a tightly bound proton-electron neutral pair in 1920, which Chadwick later isolated as the neutron.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Alexander Fleming discovered penicillin, the world's first effective antibiotic, in which year?
A. 1928
B. 1918
C. 1935
D. 1942
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Correct Answer: Option A

Explanation:
Sir Alexander Fleming discovered penicillin in 1928 at St. Mary's Hospital, London, after noticing a mold contaminating a petridish of staphylococci.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who invented the first operational hot air balloon, executing the first recorded human flight?
A. Wright Brothers
B. Count Ferdinand von Zeppelin
C. Otto Lilienthal
D. Montgolfier Brothers
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Correct Answer: Option D

Explanation:
Joseph-Michel and Jacques-Étienne Montgolfier developed and demonstrated the hot air balloon in France in 1783.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who discovered that the atomic mass of elements can vary within the same identity due to changing neutron levels, establishing 'Isotopes'?
A. Frederick Soddy
B. J.J. Thomson
C. Ernest Rutherford
D. James Chadwick
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Correct Answer: Option A

Explanation:
Soddy introduced the concept of isotopes in 1913, proving that elements can have identical chemical behaviors but different radioactive profiles.
This question belongs to: Static General Knowledge Inventions and Discoveries
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