NDA Physics · Modern Physics
Scientific Acronyms: Full Forms to Memorise
A short list of physics-and-technology acronyms whose full forms the NDA tests directly — LED, LASER, LIGO and a few common companions.
Why this matters
Two PYQs, both pure recall of an acronym's expansion. There is nothing to derive — just memorise the full forms. LED (Light Emitting Diode) and LIGO (Laser Interferometer Gravitational-wave Observatory) have both appeared.
Concept 1 of 2: Device and optics acronyms — LED, LASER, LCD
Definition
Common device/optics acronyms:
- LED = Light Emitting Diode — a semiconductor that emits light when forward-biased.
- LASER = Light Amplification by Stimulated Emission of Radiation.
- LCD = Liquid Crystal Display.
- CFL = Compact Fluorescent Lamp.
| Acronym | Full form |
|---|---|
| LED | Light Emitting Diode NDA 2018 / 2021 — LED stands for Light Emitting Diode. |
| LASER | Light Amplification by Stimulated Emission of Radiation |
| LCD | Liquid Crystal Display |
| CFL | Compact Fluorescent Lamp |
Practice this conceptself-check · 4 quick reps
The same idea in a real exam question:
Example 1 · Modern Physics · Scientific Acronyms
LED's D is DIODE, not Display
Concept 2 of 2: Big-science and research acronyms — LIGO, LASER, MASER
Definition
Research-facility / advanced-physics acronyms:
- LIGO = Laser Interferometer Gravitational-wave Observatory — detected gravitational waves.
- MASER = Microwave Amplification by Stimulated Emission of Radiation (the microwave cousin of the laser).
- SONAR = Sound Navigation and Ranging (uses ultrasonic sound).
- RADAR = Radio Detection and Ranging (uses radio waves).
| Acronym | Full form |
|---|---|
| LIGO | Laser Interferometer Gravitational-wave Observatory NDA 2019 — LIGO stands for Laser Interferometer Gravitational-wave Observatory. |
| MASER | Microwave Amplification by Stimulated Emission of Radiation |
| SONAR | Sound Navigation and Ranging |
| RADAR | Radio Detection and Ranging |
Practice this conceptself-check · 4 quick reps
The same idea in a real exam question:
Example 2 · Modern Physics · Scientific Acronyms
LIGO starts with LASER, not Light
Summary — formulas & gotchas at a glance
A revision cheat-sheet for the formulas and gotchas above. Click any concept name to jump back to its full explanation.
Reference tables (2)
Device and optics acronyms — LED, LASER, LCD4 rows
| Acronym | Full form |
|---|---|
| LED | Light Emitting Diode NDA 2018 / 2021 — LED stands for Light Emitting Diode. |
| LASER | Light Amplification by Stimulated Emission of Radiation |
| LCD | Liquid Crystal Display |
| CFL | Compact Fluorescent Lamp |
Big-science and research acronyms — LIGO, LASER, MASER4 rows
| Acronym | Full form |
|---|---|
| LIGO | Laser Interferometer Gravitational-wave Observatory NDA 2019 — LIGO stands for Laser Interferometer Gravitational-wave Observatory. |
| MASER | Microwave Amplification by Stimulated Emission of Radiation |
| SONAR | Sound Navigation and Ranging |
| RADAR | Radio Detection and Ranging |
Watch out for (2)
- LED's D is DIODE, not Display→ Device and optics acronyms — LED, LASER, LCD
- LIGO starts with LASER, not Light→ Big-science and research acronyms — LIGO, LASER, MASER
Test yourself on Modern Physics
10 past NDA questions from this chapter, timed at 10 minutes and marked the way the exam marks it. You see your score and every answer the moment you finish. Free to start.