Communication System Quiz-2

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.

Q11. A geo-synchronous satellite is
•  Located at a height of 34860 km to ensure global coverage
•  appears stationary over a place on earth's magnetic pole
•  not really stationary, but orbits the earth within 24 h
•  Always at a fixed location in state and simply spins about its own axis
Solution
not really stationary, but orbits the earth within 24 h

Q12.If the area to be covered for TV telecast is doubled, then height of transmitting antenna (TV tower) will have to be
•  Doubled
•  Halved
•  Kept unchanged
Solution
In optical communication, light is transmitted in form of light pulses along an optical fibre is transmission medium. Since, wavelength of light is very small as compared o the radio waves, it provides a very large band width and can carry a huge amount of information.
In optical fibres there occurs a total internal reflection of light so interference phenomenon must not occur.

Q13.  The velocity of electromagnetic waves in a dielectric medium of constant 4 is
•  1.5×108 ms-1
•  3×108 ms-1
•  6×108 ms-1
•  12×108 ms-1
Solution

Q14. Identify the incorrect statement from the following
•  AM detection is carried out using a rectifier and an envelop detector
•  Pulse Position denotes the time of rise or fall of the pulse amplitude
•  Modulation index Î¼ is kept ≥1, to avoid distortion
•  Facsimile (FAX) scans the contents of the document to create electronic signals
Solution
Modulation index Î¼ is kept ≤1 to avoid distortion

Q15.A transmitter transmits the message in original
•  True
•  False
•  Something true and sometimes false
•  Never True
Solution
No, the message signal has to be transformed to make it suitable for transmission

Q16. The velocity of a particle at which the kinetic energy is equal to its rest energy is
•

•

•

•
Solution

Q17.The difference in the refractive index of the fiber core and fiber cladding in step-index fibers is typically
•  0.01%
•  1%
•  10%
•  25%
Solution

Q18.The characteristic impedance (Z0 ) of free space is
•  377 W
•  357 W
•  100 W
•  1000 W
Solution

Q19.In amplitude modulation, the bandwidth is
•  Twice the audio signal frequency
•  Thrice the audio signal frequency
•  Thrice the carrier wave frequency
•  Sum of audio signal frequency and carrier wave frequency
Solution
In amplitude modulation, Bandwidth vUSB-vLSB =(vc+vm )-(vc-vm )=2vm ∴ Bandwidth = Twice the frequency of modulating signal frequency

Q20. The height of a TV antenna is 200 m. The population density is4000 km-2. Find the population benefited
•  3.2×108
•  3.2×107
•  3.2×106
• 3.2×105
Solution

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