Communication System Quiz-5

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.

Q41. The length of a half wave dipole at 30MHz is
•  10 m
•  50 m
•  5 m
•  100 m
Solution

Q42.In space communication, the information can be passed from one place to another at a distance of 100 km in
•  1 s
•  0.5 s
•  0.003 s
•  None of these
Solution

Q43.  Maximum usable frequency (MUF) in F-region layer is x, when the critical frequency is 60 MHz and the angle of incidence is 70°. Then x is
•  150MHz
•  170MHz
•  175MHz
•  190MHz
Solution

Q44. Modulation is the phenomenon of
•  Superimposing the audio frequency signal over a carrier wave
•  Separating the audio frequency signal from the carrier wave
•  Separating carrier wave from the modulated wave
•  Any of (a), (b), (c) above
Solution
In modulation, audio frequency signal is superimposed on radio frequency carrier wave

Q45.The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as
•  Transmission
•  Reception
•  Modulation
•  Detection
Solution
Carrier + signal → modulation

Q36. The population inversion necessary for laser action used in solid state lasers is
• Electrical discharge
•  Inelastic atom-atom collisions
•  Direct conversion
•  Optical pumping
Solution
The population inversion required for laser action in solid state laser is optical pumping

Q47.A radio station has two channels. One is AM at 1020 kHz and the other FM at 89.5 Mhz. For good results you will use
•  Longer antenna for the AM channel and shorter for the FM
•  Shorter antenna for the AM channel and longer for the FM
•  Same length antenna will work for both
•  Information given is not enough to say which one to use for which
Solution
For efficient radiation and reception, the height of to be the transmitting and receiving antennas should be comparable to a quarter wavelength of the frequency used. Therefore FM has shorter antenna and AM has longer antenna.

Q48.Major parts of a communication system are
•  Transmitter and communication channel
• Transmitter, receiver and communication channel
Solution
A communication system is made up of three parts, transmitter, communication channel and receiver

Q49.Numerical aperture of optical fiber is a measure of
•  Its resolving power
•  Its light gathering power
•  The pulse dispersion
•  The attenuation of light through it
Solution
Its light gathering power

Q50. The characteristic impedance of a co-axial cable is160 Î©. If its inductance is 0.4 mH, its capacitance would be
•  15.6 Î¼F
•  1.6 F
•  15.6 nF
• 15.6 pF
Solution

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