## Communication System Quiz-1

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q1.In a radio receiver, the short wave and medium wave stations are tuned by using the same capacitor but coils of different inductance Ls and Lmrespectively then
•  Ls>Lm
•  Ls < Lm
•  Ls=Lm
•  None of these
Solution

Q2.The number of telephonic message which are carried by a fiber at an instant with much less intensity loss are
•  2400
•  2000
•  2200
•  1800
Solution
2000 number of telephonic messages can be carried by a optical fiber at an instant

Q3.  Calculate the phase velocity of electromagnetic wave having electron density and frequency of D-layer, N=400 electron cc-1,v=200 kHz
•   3×108 ms-1
•  3.5×108 ms-1
•  6.9×108 ms-1
•  1.1×108 ms-1
Solution

Q4. A laser device produces amplification in the
•  Microwave region
•  Ultraviolet or visible region
•  Infrared region
•  None of the above
Solution
A laser device produces amplification in the ultraviolet or visible region.

•  Omnidirectional type
•  Vertical type
•  Horizontal type
•  None of these
Solution
Vertical type

Q6. Fading is the variation in the strength of a signal at a receiver due to
•  Interference of waves
•  Diffraction of waves
•  Polarisation of waves
•  None of these
Solution
Interference of waves

Q7.Which one of the following is incorrect statement in the transmission of electromagnetic waves?
•  Ground wave propagation is for high frequency transmission
•  Sky wave propagation is facilitated by ionospheric layers
•  Space wave is of high frequency and is suitable for line of sight communication
•  Space wave is used for satellite communication
Solution
Ground wave propagation is for high frequency transmission

Q8.Because of tilting which waves finally disappear
•  Microwaves
•  Surface waves
•  Sky waves
•  Space waves
Solution
Surface waves

Q9.Faintest stars are called
•  Dwarfs
•  Sixth magnitude stars
•  Second magnitude
•  Zero magnitude stars
Solution
Sixth magnitude stars

Q10. Consider telecommunication through optical fibres. Which of the following statements is no true?
•  Optical fibres can be of graded refractive index
•  Optical fibres are subjected to electro-magnetic interference from outside
•  Optical fibres have extremely low transmission loss
• Optical fibres may have homogeneous core with a suitable cladding
Solution
Some of the characteristics of an optical fibre are as follows.
(i) This works on the principle of total internal reflection.
(ii) It consists of core made up of glass/silica/plastic with refractive index n1, which is surrounded by a        glass or plastic cladding with refractive index n2 (n2>n1 ). The refractive index of cladding can be          either changing abruptly or gradually changing (Graded index fibre).
(iii) There is a very little transmission loss through optical fibres.
(iv) There is no interference from stray electric and magnetic fields to the signals through optical fibres.

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