Class 12 Physics Chapter 15 - Communication System: NCERT Solutions Free PDF Download
FAQs on NCERT Solutions for Class 12 Physics Chapter 15 - Communication Systems
1. What is the Weightage of Questions that can be Asked From the Communication System?
Communication System belongs to the last part of the syllabus and hence encompasses questions that carry lesser marks. In this case, long answer type questions are more likely to be asked. Students often ignore the chapters that weigh less and focus on more weightage chapters for high marks. However, if practised thoroughly, low weightage chapters can fetch you marks that help in increasing your overall score.
2. How do NCERT Solutions Help in a Thorough Study of the Chapters?
NCERT Solutions for Class 12 Physics is devised in such a manner that it keeps in mind the knowledge level of all the students. Many students may be bright in a subject, others may not easily understand the chapters of Physics. Therefore, NCERT Solutions are carefully formulated by experts who can compile the chapter in a manner that even a layman can study and learn. Learning physics is made easy when you opt for NCERT Solutions by Vedantu and study and learn through the material provided.
3. Is it Necessary to Solve Previous Year Question Papers?
Knowledge about the type of questions asked in the exams helps in improving your study pattern and evolving new ways to study smartly. It has been noted that solving question papers of past years helps students to engage with and solve a variety of questions and understand the complex language in which they might be asked. These papers are solved by experts at Vedantu who have kept in mind all the needs of students and provide solutions based on best of their knowledge. Previous year questions may come for the exams or are similar to the questions that can be asked. These questions also help students learn and understand the chapters to the fullest.
4. What are the various divisions of Chapter 15 of Class 12 Physics?
Chapter 15 of Class 12 Physics is divided into the following parts:
Introduction
Elements Of A Communication System
Basic Terminologies used In Electronic Communication Systems
Bandwidth Of Signals
Bandwidth Of Transmission Mediums
Propagation Of Electromagnetic Waves
Ground Waves
Sky Waves
Space Waves
Modulation and its necessity
Size of the antenna or aerial
Effective Power radiated by an antenna
Mixing up of signals from different transmitters
Amplitude Modulation
Production of Amplitude Modulated waves
Detection of Amplitude Modulated waves
To get the NCERT Solutions for understanding these topics, tap on NCERT Solutions for Chapter 15 Class 12 Physics.
5. What were the inventions done in the following years?
1835
1955
1989-91
1835 – The “Telegraph” was invented by Samuel F.B. Morse and Sir Charles Wheatstone. This creation reduced the manual travel of messengers as the growth of messages through post offices increased.
1955 – Alexander Bain invented the First radio FAX which was transmitted across the continent. The idea for this innovation was patented by Alexander Bain in 1843.
1989-91 – World Wide Web was innovated by Tim Berners-Lee. The WWW was regarded as the mammoth encyclopaedia of knowledge that is accessible by everyone around the world.
6. Write a short note on “Signal”.
A signal is defined as the information which is converted into the electrical form for suitable transmission. There are two types of signal: digital and analogue.
The continuous variations of current and voltage are known as analogue signals. These signals are considered as single-valued functions of time. The signals which can carry only discrete stepwise values are known as digital signals. For analogue signals, the sine wave is fundamental. For digital communications, there are different coding schemes. In the binary system, ‘0’ represents a low level and ‘1’ depicts a high level of voltage or current.
7. Interpret the following terms:
Noise
Demodulation
Repeater
Noise – The unwanted signals that create a disturbance in the transmission and processing of message signals in communication systems are termed noise. The source of noise may be present outside or inside the system.
Demodulation – It is defined as the process in which information is taken from the carrier wave at the receiver. Demodulation is the contrary procedure of modulation.
Repeater – The union of transmitter and receiver is known as a repeater. The repeater takes the signal from the transmitter, amplifies it and gives it back to the receiver.
8. What are the advantages and disadvantages of satellite communication?
Advantages of satellite communication are:
With the use of satellite communication, a single relay station can enclose a large part of the Earth.
There is an option of checking the transmitted information transit by the satellite.
The communication cost is not dependent on the distance between the two points on the Earth.
Disadvantages of satellite communication are:
There is no privacy and security as the information delivered by the satellite can be heard or caught by everyone.
It is difficult to repair the satellite system as it is subjected to extreme environmental stress.
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