Who discovered that certain elements change identities through radioactive transmutation, establishing the laws of radioactive decay? MCQ with Answer and Explanation

Who discovered that certain elements change identities through radioactive transmutation, establishing the laws of radioactive decay?
A. Marie Curie
B. Otto Hahn
C. Henri Becquerel
D. Ernest Rutherford and Frederick Soddy
Answer: Option D
Solution (By JKSSB Mock Tests)
Rutherford and Soddy formulated the decay transformation principles, proving elements naturally break down into different elements.

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Practice More Inventions and Discoveries Questions

Question #1
The concept of absolute zero temperature and the thermodynamic scale was discovered by whom?
A. James Joule
B. Daniel Gabriel Fahrenheit
C. Anders Celsius
D. Lord Kelvin

Correct Answer: Option D


Explanation:
William Thomson, later Lord Kelvin, proposed the absolute thermodynamic scale of temperature in 1848.

Question #2
Who discovered the iconic 'Uncertainty Principle' in quantum physics?
A. Werner Heisenberg
B. Erwin Schrödinger
C. Niels Bohr
D. Max Born

Correct Answer: Option A


Explanation:
Werner Heisenberg formulated the principle stating that the position and momentum of a subatomic particle cannot be measured simultaneously with absolute precision.

Question #3
The invention of the flash memory architecture, ubiquitous in USB drives and SSDs, was developed by whom?
A. Douglas Engelbart
B. Fujio Masuoka
C. Tim Berners-Lee
D. Alan Turing

Correct Answer: Option B


Explanation:
Fujio Masuoka invented both NOR and NAND flash memory while working at Toshiba in the 1980s.