Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Communication Systems, Exercise 3: Competitive Thinking

Author:Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula & Ketki Deshpande

Umakant Kondapure Physics Solutions for Exercise - Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Communication Systems, Exercise 3: Competitive Thinking

Attempt the practice questions on Chapter 14: Communication Systems, Exercise 3: Competitive Thinking with hints and solutions to strengthen your understanding. MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET solutions are prepared by Experienced Embibe Experts.

Questions from Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Communication Systems, Exercise 3: Competitive Thinking with Hints & Solutions

EASY
MHT-CET
IMPORTANT

The maximum frequency of transmitted radio waves above which the radio waves are no longer reflected back by ionosphere is (N=maximum electron density of ionosphere),

EASY
MHT-CET
IMPORTANT

For sky wave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere?

MEDIUM
MHT-CET
IMPORTANT

A sky wave with a frequency 55 MHz is incident on D-region of earth's atmosphere at 45°. The angle of refraction is (electron density for D-region is 400 electrons cm-3 ),

EASY
MHT-CET
IMPORTANT

A transmitting antenna of height $h$ and the receiving antenna of height 45 m are separated by a distance of 40 km of satisfactory communication in line-of-sight mode. Then, the value of $h$ is (given, radius of earth is 6400 km),

EASY
MHT-CET
IMPORTANT

In optical communication system operating at 1200 nm, only $2 \%$ of the source frequency is available for TV transmission having a bandwidth of 5 MHz. The number of TV channels which can be transmitted is,

EASY
MHT-CET
IMPORTANT

Assertion: Electromagnetic waves with frequencies more than the critical frequency of ionosphere cannot be used for communication using sky wave propagation.

Reason: The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.

EASY
MHT-CET
IMPORTANT

A message signal of frequency $\omega_{\mathrm{m}}$ is superposed on carrier wave of frequency $\omega_{\mathrm{c}}$ to get an amplitude modulated wave (AM). Then, one of the angular frequencies of the AM wave is,

EASY
MHT-CET
IMPORTANT

Assertion: A portable AM radio set must be kept horizontal to receive the signals properly.

Reason: Radio waves are polarised electromagnetic waves.