1. . The angle of incidence for which the angle of refraction is 90° is called:
(A) Right angle
(B) Crucial angle
(C) Critical angle
(D) Visual angle
2. . The relationship between critical angle ‘C’ and refractive index ‘n’ is:
(A) n = sin C
(B) n = 1/sin C
(C) n = cos C
(D) n = tan C
3. . The refractive index of glass is:
(A) 1.33
(B) 1.4
(C) 2.5
(D) 1.52
4. . The refractive index of water is:
(A) 1.5
(B) 2.33
(C) 1.33
(D) 0.33
5. . The raw material for optical fiber is:
(A) Copper
(B) Silver
(C) Plastic
(D) Silica
6. . The signals are transmitted through optical fiber by:
(A) Total internal reflection
(B) Refraction
(C) Dispersion
(D) Diffraction
7. . The signals transmitted through optical fiber are:
(A) Light signals
(B) Electrical signals
(C) Sound waves
(D) Gamma rays
8. . The optical fiber through which only one signal is transmitted at a time is called:
(A) Multi mode Graded index
(B) Multi mode
(C) Multi mode Step index
(D) Mono mode
9. . The diameter of the core of single mode optical fiber is approximately equal to:
(A) 5 mm
(B) 8 μm
(C) 5 m
(D) 5 cm
10. . The diameter of the core of multi-mode fiber is approximately equal to:
(A) 50 mm
(B) 5 μm
(C) 50 μm
(D) 50 cm
11. . The central part of the optical fiber is called:
(A) Cladding
(B) Core
(C) Optical center
(D) Kevlar