## Communication System Quiz-4

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.

Q31. A microphone converts
•  Sound signals into electrical signals
•  Electrical signals into sound signals
•  Both (a) and (b) above
•  Neither (a) nor (b)
Solution
Sound signals into electrical signals

Q32.A 1000kHz carrier wave is modulated by audio signal of frequency range 100-5000Hz. Then the width of the channel in kHz is
•  10
•  20
•  30
•  40
Solution
Band width =2× frequency of modulating =2×5000 Hz=10 kHz

Q33.  The modulation in which pulse duration varies in accordance with the modulating signal is called
•  PAM
•  PPM
•  PWM
•  PCM
Solution
PWM

Q34. Frequency range for microwaves is
•  3×104 to 3×109 Hz
•  3×109 to 3×1013Hz
•  3×109 to 3×1014Hz
•  1×109 to 3×1011Hz
Solution
Frequency range for microwaves is 1×109 to 3×1011 Hz

Q35.The characteristic impedance (Z0) parallel line wire is
•

•

•

•
Solution
choice (a) is correct as Za=276/√k log⁡(2s/d)

Q36. If an electromagnetic wave is transmitted to the height equal to 150 km with maximum frequency 300 kHz and critical frequency 100 kHz, the skip distance is
• 426 km
•  636 km
•  824 km
•  849 km
Solution

Q37.In which frequencies range space waves normally propagated
•  HF
•  VHF
•  UHF
•  SHF
Solution
Ultra high frequency waves are generally normally propagated

Q38.The waves relevant to telecommunications are
•  Visible light
•   Infrared
•  Ultraviolet
• Microwave
Solution

Q39.If a radio receiver amplifies all the signal frequencies equally well, it is said to have high
•  Fidelity
•  Distortion
•  Sensibility
•  Sensitivity
Solution

Q40. The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is
•  10%
•  20%
• 25%
•  50%
Solution

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