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10 Question-Answer on optical fibers 1.        The main objective of an optical source is: (a)     To demodulate the electrical signal (b)    To detect the signal (c)     To convert the electrical energy into an optical energy (d)    All of these Ans: ( c) 2.        The number of telephonic messages which are carried by a fiber at an instant with much less intensity loss are (a)     2400 (b)    2200 (c)     2000 (d)    1800 Ans: ( c) 3.        Lasers are used in alignment because (a)     They are coherent (b)    They are highly directional (c)     Both (a) and (b) (d)    None of these Ans: ( c) 4.        Which fibers are less expensive and simple to construct? (a)     S...