class 12 communication system short question answer
Dear students class 12 communication system short question answer PDF have been collected at one place to get you all prepared for your 12th Bihar board exam, as well as for UP board exams ,Jharkhand board exam ,MP board exams ,Rajsthan board exams ,cbse board exams and other board exams. Visit my nawendu classes youtube channel for more help.
Q.1. – What is Ionosphere?
also read- NEET Numericals
Ans. – The part of
atmosphere,which is extended from 80 km to 400 km is called ionosphere.
also read- 12th Physics Short Question-Answer
It plays main
role in sky – wave communications because it reflects some frequencies of radio
waves.
Ans. – Frequency of T.V. signal
is high. Which is not reflected by ionosphere this is why – satellites are used
in long distance T.V. transmission.
Q.3. – What is meaning of “modulation index is 75%”?
Ans. – since we know that
also read- 12th Physics Important Long Question
Amplitude modulation index = Am/Ac
or, 75% = Am/Ac
or,75/100 =Am/Ac
or, Am/Ac = ¾
Am/Ac = 3:4
also read- 12th board Question Bank
Hence ratio of (message wave)Am to (carrier wave) Ac is 3:4
chapter 1 ELECTRIC CHARGES AND FIELDS short Q-A
chapter 2 ELECTROSTATIC POTENTIAL AND CAPACITANCE short Q-A
chapter 3 CURRENT ELECTRICITY short Q-A
chapter 4 MOVING CHARGES AND MAGNETISM short Q-A
chapter 5 MAGNETISM AND MATTER short Q-A
chapter 6 ELECTROMAGNETIC INDUCTION short Q-A
chapter 7 ALTERNATING CURRENT short Q-A
chapter 8 ELECTROMAGNETIC WAVES short Q-A
chapter 2 ELECTROSTATIC POTENTIAL AND CAPACITANCE short Q-A
chapter 3 CURRENT ELECTRICITY short Q-A
chapter 4 MOVING CHARGES AND MAGNETISM short Q-A
chapter 5 MAGNETISM AND MATTER short Q-A
chapter 6 ELECTROMAGNETIC INDUCTION short Q-A
chapter 7 ALTERNATING CURRENT short Q-A
chapter 8 ELECTROMAGNETIC WAVES short Q-A
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