## Communication System Quiz-10

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.

Q91. If Î¼1 and Î¼2 are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimized by having
•  Î¼1>Î¼2
•  Î¼1<Î¼2
•  Î¼1=Î¼2
•  None of these
Solution
Refractive index of core is always greater than refractive index of cladding, to minimize the loss of light.

Q92.The audio signal used to modulate 60 sin⁡(2Ï€×106 t) is 15 sin⁡300Ï€t. The depth of modulation is
•  50%
•  40%
•  25%
•  15%
Solution
ma=Em/Ec =15/60×100=25%

Q93.  The frequency of a FM transmitter without signal input is called
•  Lower side band frequency
•  Upper side band frequency
•  Resting frequency
•  None of these
Solution
Resting frequency

Q94. Ozone layer above earth's atmosphere will not
•  Prevent infrared radiations from sun reaching on earth
•  Prevent infrared radiations originated from earth from escaping earth's atmosphere
•  Prevent ultra violet rays from sun
Solution
Ozone layer will absorb UV rays; reflects the infrared radiation and does not reflected back radiowaves

Q95.The cladding material of optical fibre has refractive index
•  Greater than that of core
•  Infinity
•  Equal of that of core
•  Less than that of core
Solution
In optical fibre, the core (refractive index Î¼1) is surrounded by cladding (refractive index Î¼2) made up of transparent glass or plastic such that Î¼2>Î¼1.

Q96. A TV tower has a height 150 m. What is the total population covered by the TV tower, if the population density around the TV tower is 103 km-2?
•  60.288 lakhs
•  40.192 lakhs
• 100 lakhs
•  20.228 lakhs
Solution

Q97.Two electrons are moving in opposite direction with speeds 0.8 c and 0.4 c, where c the speed of light in vacuum.Then the relative speed is about
•  0.4 c
•  0.8 c
•  0.9 c
•  1.2 c
Solution

Q98.A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of
•  Sky wave
•  Sea wave
•  Both (a) and (b)
• Ground wave
Solution
A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of sky wave and ground wave depending upon the frequency of signal

Q99.The portfolios to the central ministers are allocated by:
•  Conductor heating only
•  Dielectric heating only
•  All of the above
Solution
All the three types of energy losses persist in transmission lines

Q100. The ratio waves of frequency 30 MHz to 300 MHz belong to
•  High frequency band
•  Very high frequency band
•  Ultra high frequency band
• Super high frequency band
Solution
Radiowaves of frequency 30 MHz to 300 MHz belong to very high frequency band

#### Written by: AUTHORNAME

AUTHORDESCRIPTION

## Want to know more

Please fill in the details below:

## Latest NEET Articles\$type=three\$c=3\$author=hide\$comment=hide\$rm=hide\$date=hide\$snippet=hide

Name

ltr
item
BEST NEET COACHING CENTER | BEST IIT JEE COACHING INSTITUTE | BEST NEET & IIT JEE COACHING: Communication-System-Quiz-10
Communication-System-Quiz-10