MDCAT Physics Chapter 7 Light Online Test With Answers

MDCAT Physics Chapter 7 Light Online Test

Sr. # Questions Answers Choice
1 In a never system, the repeaters are placed at about 50 km 75 km 100 km 125 km
2 Repeaters are the devices which regenerate the signals and are placed at about 20 km 30 km 40 km 50 km
3 The ultra-purity of optical fibre is 90 %  99 % 99.9 % 99.99 %
4 The digital modulation is expressed in Bytes Codes Bits None of these
5 The transmission of information by light waves may be An audio signal A television signal A computer data signals All of them
6 Which one light source can travel faster through optical fibre is Infra red Visible Ultra violet All of these
7 The typical wavelength of light source in transmitter is 1.1 μm 1.2 μm 1.3 μm 1.4 μm
8 The light source in the transmitter can be either Light emitting diode Semiconductor laser Light emitting in an invisible infra red All of these
9 The components of a fibre optic communication system is/are At transmitter An optical fibre Receiver All of these
10 How many major components of fibre optic communication system are 4 5 3 2
11 When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is 11.2<sup>o</sup> 14.2<sup>o</sup> 15.4<sup>o</sup> 13.6<sup>o</sup>
12 Calculate the critical angle when core refractive index is 1.50 and cladding of refractive index 1.48 70.3<sup>o</sup> 80.9<sup>o</sup> 80.6<sup>o</sup> 89.6<sup>o</sup>
13 In multimode graded index fibre core and cladding has boundary Noticeable&nbsp; No noticeable No boundary None of these
14 The range of the diameter of core in multimode graded index fibre is 50 to 100&nbsp;μm 50 to 1000&nbsp;μm 50 to 1000&nbsp;μm None of these
15 The lower refractive index the fibre core has 1.48 1.40 1.54 1.42
16 The fibre core has constant refractive index such as 1.48 1.5 1.52 1.56
17 Due to dispersion effects, white light source is useful for Long distance Short distance Very long distances None of these
18 The light source used in multimode step index fibre is A monochromatic source Red light White light None of these
19 Multimode step index fibre has diameter as 40&nbsp;μm 50&nbsp;μm 60&nbsp;μm None of these
20 A single step index fibre can carry more than 14 TV channels 14,000 phone calls 16 TV channels a and b
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