MCQ practice · SSC Physics Board questions · Chapter 1: Physical Quantities and Their Measurements
The scientist who announced the existence of antimatter is:
Think it through first, then pick an option.
- a Dirac
- b Henri Becquerel
- c Al-Khwarizmi
- d Copernicus
Answer and explanation
Correct answer: a Dirac
Dirac announced the anti-particle in 1931, joining the quantum theory with relativity.
Why the other options are wrong
- b Henri Becquerel: Becquerel showed in 1896 that radioactive radiation comes from the centre of the atom; the anti-particle was announced by Dirac.
- c Al-Khwarizmi: Al-Khwarizmi does not belong to the line of modern physics; the anti-particle was announced by Dirac.
- d Copernicus: Copernicus belongs to 1543, long before modern physics; the anti-particle was announced by Dirac in 1931.
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