1. . Optical fiber is made of ___________
(A) Glass and plastic
(B) Silica
(C) Plastic
(D) None of these
2. . In optical fiber used as light source ___________
(A) L.E.D
(B) Laser
(C) Photo diode
(D) a and b
3. . The velocity of light is ___________
(A) 3×10⁸ m/sec
(B) 3×10⁸ miles/sec
(C) 3×10¹⁸ m/sec
(D) None of these
4. . The signal travels in optical fiber in the form of ___________
(A) Voltage
(B) Current
(C) Light
(D) None of these
5. . Optical receiver converts the light into ___________
(A) Electrical signal
(B) Light signal
(C) Waves
(D) None of these
6. . Light travels in optical fiber ___________
(A) Straight
(B) Zigzag
(C) Vertical
(D) None of these
7. . Light reflects in optical fiber from ___________
(A) Cladding
(B) Core
(C) Rubber
(D) All of these
8. . For long distance transmission the optical transmitter is used ___________
(A) L.E.D
(B) LASER
(C) Photo diode
(D) Photo transistor
9. . To control the temperature of LASER diode by ___________
(A) Feedback
(B) Cooling
(C) Water
(D) None of these
10. . Ratio of losses signal in optical fiber is ___________
(A) More
(B) Less
(C) Too much
(D) None of these