This is a straightforward question testing basic knowledge of common electronic component abbreviations.
The full form of LED is
Asked in UPSC NDA 2 2018 · Topic: Optics (Laser: Principles and applications)
More Physics questions
- In which one of the following devices, the light energy is converted into the electrical energy?
- What was the active medium used in the first working laser ever constructed ?
- The term LASER stands for
- Which one of the following statements on photoelectric effect is NOT correct ?
- With reference to street-lighting, how do sodium lamps differ from LED lamps? 1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps. 2. As street-lights, sodium lamps have longer life span than LED lamps. 3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting. Select the correct answer using the code given below.
- Laser is a device for producing
- Photovoltaic cells are
- For reproducing sound, a CD (Compact Disc) audio player uses a