Optical Fiber Communication MCQ Questions and Answers for Practice

1. Visible lights wavelength range ...................

1. 0.39 – 0.77 mm
2. 0.39 – 0.77 µm
3. 0.39 – 0.77 nm
4. 0.39 – 0.77 cm

2. Sum of these is unity

1. Reflectivity
2. Reflectivity + Refractivity
3. Reflectivity + Refractivity + Transmitivity
4. Any

3. Metals can ................... the light beams.

1. Reflect
2. Refract
3. Transmit
4. Any

4. Metals are ...................

1. Transparent
2. Opaque
3. Translucent
4. None

5. Metals can transmit these ...................

1. Radio ways
2. Visible light
3. Microwaves
4. x-rays

6. Reflectivity of metals

1. 0.05
2. 0.5
3. 0.95
4. None

7. Refractive index of materials is approximately equal to square root of

1. electrical permittivity
2. magnetic permeability
3. electrical permittivity x magnetic permeability
4. None

8. Snells law relates ...................

1. Light relfection
2. Light refraction
3. Light transmission
4. Light Absorption

9. Bouguers law relates ...................

1. Light relfection
2. Light refraction
3. Light transmission
4. Light Absorption

10. Sky looks blue because the sun light is subjected to ...................

1. Rayleigh scattering
2. Compton scattering
3. Both
4. None

11. Luminescence is because of

1. Photons emitted while excited electrons drops down
2. Knocking out of electrons by photons
3. Photons stimulated by photons
4. All

12. Fluorescence occurs within ...................

1. 10-5 s.
2. 10-5 ms.
3. 10-5 µs.
4. 10-5ns.

13. Electro-luminescence occurs in ...................

1. Electrical conductors
2. Electrical insulators
3. p-n junctions
4. all

14. Pyrometer works based on

1. Laser technology
2. Photo-conduction
3. Thermal emission
4. Tyndall effect

15. Solar cell works based on

1. Laser technology
2. Photo-conduction
3. Thermal emission
4. Tyndall effect