Optical communication Bank PO MCQ Questions With Answers Quiz Questions

1. Optical fibers suffer radiation losses at bends or curves on their paths. State true or false.

A True B False

2. Range of optical communication

A 700 nm to 1700 nm B 800 nm to 1700 nm C 800 nm to 1200 nm D 800mm to 1600 mm

3. The wavelength region used in second window

A 800 to 900 nm B 1100 to 1350nm C 1500 to 1650nm D 1200 nm to 1400 nm

4. Which communication gives larger repeater spacing ?

A Coaxial cable B Twisted pair cable C Microwave communication system

5. Fiber optics provide data security.

A True B False

6. The light sources used in fibre optics communication are :

A a) LED’s and Lasers B b) Phototransistors C c) Xenon lights D d) Incandescent

7. Define - Acceptance Angle

A maximum angle that a light ray can have relative to the axis of the fiber and propagate down the fiber. B minimum angle that a light ray can have relative to the axis of the fiber and propagate down the fiber. C Right angle that a light ray can have relative to the axis of the fiber and propagate down the fiber. D None of the above

8. The type of attenuation shown is

A Absorption Loss B Scattering Loss C Radiation Loss D Adsorption Loss

9. Helium-Neon LASER is a:

A Gas LASER B Liquid LASER C Solid LASER D Plasma Laser

10. Which Physicist paved the idea that we can guide light.

A John Tyndal B John Mathews C Johnson D Jerry Pinto

11. A device which converts electrical energy in the form of a current into optical energy is called as

A a) Optical source B b) Optical coupler C c) Optical isolator D d) Circulator

12. What are fibre optics?

A thin, flexible fibres of glass/plastic B flexible fibers of copper C strands of rubber D those glow toys

13. The ratio of speed of light in air to the speed of light in another medium is called as_________

A a) Speed factor B b) Dielectric constant C c) Reflection index D d) Refraction index

14. Optical fibers work on the principle of

A total internal refraction B total internal absorption C total internal reflection D total internal flow

15. Which of these types of optical fibers is almost impossible to manufacture?

A Single mode, step index OFC B MUlti mode, Step index OFC C Single mode, graded index OFC D Multi mode, graded index OFC

16. Compared to the core, the index of refraction of the cladding must be:

A a. the same B b. greater C c. less D d. doesn’t have an index of refraction

17. The condition for propagation of light in optical fibers is

A Sinθi B Sinθi>NASin\theta_i>NASinθi>NA C Sinθi=NASin\theta_i=NASinθi=NA D Sinθi=0.5Sin\theta_i=0.5Sinθi=0.5