OPSC OAS 2020 PrelimsScience & TechnologyQuestion 10
Solved previous year question from the OPSC OAS/OCS 2020 Preliminary Examination (General Studies), with the official answer key and a detailed explanation.
Question
Subatomic particles are:
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Answer & Explanation
Correct answer: (D) All of these
- Electrons, Protons, and Neutrons are all subatomic particles — meaning they are particles that are smaller than an atom and exist within an atom. These three particles together make up the structure of every atom.
The Three Fundamental Subatomic Particles
| Particle | Symbol | Charge | Mass | Location |
|---|---|---|---|---|
| Electron | e⁻ | Negative (-1) | 9.109 × 10⁻³¹ kg (negligible, approximately 1/1836 of proton) | Orbits around the nucleus in electron shells |
| Proton | p⁺ | Positive (+1) | 1.672 × 10⁻²⁷ kg (approximately 1 amu) | Inside the nucleus |
| Neutron | n⁰ | Neutral (0) | 1.674 × 10⁻²⁷ kg (slightly heavier than proton, approximately 1 amu) | Inside the nucleus |
