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JEE Main - Communication System Important Questions (Free PDF Download)

Last updated date: 17th Apr 2024
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Achieve Success in JEE Main 2024: Communication System Important Questions With Solutions PDF

Vedantu offers a valuable resource with its precisely selected JEE Main Communication System Important Questions by Vedantu's Master Teachers. They stay well-informed about current trends, ensuring that questions align closely with the JEE Main exam syllabus. Communication System important questions for JEE Main come in various formats, including multiple-choice questions (MCQs) and Integer Questions, allowing students to assess their proficiency across different levels. With comprehensive solutions and explanations, the JEE Main Important Questions PDF for Communication System helps students grasp the correct approaches and techniques. Furthermore, the JEE Main Communication System Important Questions PDF incorporates Previous Year Questions from JEE Main Exams, offering students enough questions to solve and excel in the upcoming exam. The best part? These resources are completely free and easily accessible in PDF format for direct download from our website.


JEE Main Important Questions


Text, Images, Videos and PDF


JEE Main

Chapter Name:

Communication System

Academic Session:



English Medium



Available Material:

Chapter-wise Important Questions with PDF

Communication System Important Questions PDF for JEE Main should be an essential material for students since this chapter explores the intricate web of transmitting and receiving information through various channels, encompassing principles of modulation, encoding, and decoding for efficient communication. You will get an idea of the importance of the Communication System in JEE Main by looking at the table below. 

Year Wise Weightage of Questions: JEE Main Communication System

Sl. No.


Average No. Of Questions Asked

Marks per Question

Total Marks





















Take advantage of the opportunity to boost your preparation with our Communication System Important Questions. These Important Questions of Communication System for JEE Main cover the entire JEE Main Physics Syllabus; you can download them for FREE.

Competitive Exams after 12th Science

Communication System JEE Main 2024: Important Topics

Here are a few Important topics students should consider when learning the Communication System chapter. These subjects are selected from previous years' JEE Main exams. Therefore, before you get the Communication System important questions for JEE Main, you can review this list of significant topics from the Communication System.

  • Propagation of electromagnetic waves

  • Amplitude modulation

  • Frequency modulation

  • Bandwidth

  • Noise

  • Error detection and correction

  • Data communication

  • Digital modulation

JEE 2024 Physics Important Questions: Get Chapter-wise Links Here

Access organised JEE 2024 Physics Important Questions with convenient chapter-wise links. Dive into essential topics, grasp key concepts, and prepare effectively for your exams. Get the edge you need these focused Important Questions.

JEE Main 2024 Physics Important Questions - Chapter-wise List

Physics and Measurement Important Questions

Current Electricity Important Questions

Kinematics Important Questions

Magnetic Effects of Current and Magnetism Important Questions

Laws of Motion Important Questions

Electromagnetic Induction and Alternating Current Important Questions

Work, Power and Energy Important Questions

Electromagnetic Waves Important Questions

Rotational Motion Important Questions

Optics Important Questions

Gravitation Important Questions

Dual Nature of Matter and Radiation Important Questions

Properties of Solids and Liquids Important Questions

Atoms and Nuclei Important Questions

Thermodynamics Important Questions

Electronic Devices Important Questions

Kinetic Theory of Gases Important Questions

Communication System Important Questions

Oscillations and Waves Important Questions

Experimental Skills Important Questions

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Learn With Communication System Important Questions and Score High in JEE Main 2024

Students learn Communication Systems to excel in competitive exams like JEE Main. This crucial subject delves into the transmission of information through various channels and signals, helping them understand the intricate world of electronics and telecommunications, ultimately paving the way to solve most of the Important Questions of Communication System in JEE Main Exam.

The weightage of Communication System in JEE Main is around The weightage of Communication System in JEE Main is 3.33%. This means that there is an expected 1 question from this chapter in the JEE Main exam. Students can also expect direct questions from this section, making it one of the scoring topics. Here are the few points that make the chapter high weightage.

Understanding the Fundamentals of Communication Systems:

A. What is a Communication System?

A communication system is a network of interconnected devices and processes that facilitate the transmission and reception of information. It comprises several components, such as transmitters, receivers, channels, and protocols. By establishing connections, communication systems enable telecommunication and networking, allowing individuals and organizations to exchange information efficiently.

B. Key Elements of Communication Systems:

Information Sharing:

Information sharing is the backbone of communication systems. It involves transmitting and receiving data, voice, and multimedia content. Whether it's making a phone call, sending an email, or streaming a video, information sharing enables effective communication across various platforms.

Signal Processing:

Signal processing is crucial in communication systems. It involves encoding, modulation, and demodulation of signals to ensure efficient transmission and reception of data. By manipulating signals, communication systems can overcome noise and other interferences, delivering clear and reliable information.

Data Transmission:

Data transmission refers to the process of transmitting data from one point to another. Communication systems utilize various methods, including wired and wireless communication, to transmit data. Whether it's through fiber optics or wireless networks, data transmission plays a pivotal role in connecting individuals and organizations.

Advancements in Communication Systems:

A. Wireless Communication:

Wireless communication has revolutionized how we connect and communicate. It has evolved from basic radio systems to encompass technologies like Bluetooth, Wi-Fi, and cellular networks. Wireless communication offers advantages such as mobility, convenience, and flexibility, making it widely utilized in industries such as healthcare, transportation, and entertainment.

B. Optical Communication:

Optical communication relies on the use of optical fibers to transmit data through light signals. This method allows high-speed data transmission and is known for its reliability and security. Optical communication finds applications in telecommunications, internet connectivity, and data centers, catering to the increasing demand for faster and more efficient transmission.

C. Satellite Communication:

Satellite communication enables global connectivity, especially in remote areas. Satellites orbiting the Earth transmit and receive signals, allowing communication over vast distances. This technology plays a crucial role in disaster management, providing communication infrastructure when terrestrial networks are unavailable or disrupted.

Communication Networks:

A. Internet Protocol (IP):

The Internet Protocol (IP) serves as the foundation of communication networks. It assigns unique IP addresses to devices and facilitates packet routing, ensuring that data reaches its intended destination. IP is essential for the internet to function, enabling seamless communication between devices worldwide.

B. Types of Communication Networks:

Digital Communication:

Digital communication systems use discrete signals, represented by binary digits (0s and 1s). This method offers benefits such as error correction, encryption, and higher data capacity. Digital communication finds applications in telecommunications, computer networking, and data transmission, enabling efficient and secure communication.

Analog Communication:

Analog communication uses continuous signals, representing information using varying physical quantities such as voltage or frequency. Although digital communication has gained prominence, analog communication remains relevant in industries such as audio broadcasting and certain types of telephony.

C. Communication Channels:

Communication channels are the mediums through which data is transmitted. They can be either wired or wireless, providing pathways for information to travel. Wired communication channels, such as copper wires and fiber optics, offer reliability and high data rates. Wireless communication channels, including radio waves and microwaves, provide flexibility and mobility.

The Science Behind Communication Systems:

A. Electromagnetic Waves:

Communication systems rely on electromagnetic waves to transmit signals. Electromagnetic waves consist of electric and magnetic fields that oscillate perpendicular to each other. By manipulating the properties of these waves, communication systems can transmit and receive information over various frequencies, enabling wireless communication.

B. Radio Waves:

Radio waves are a type of electromagnetic waves used for wireless communication and broadcasting. They have long wavelengths and are suitable for long-distance transmission. Radio waves find applications in radio broadcasting, wireless networking, and satellite communication, playing a crucial role in our daily lives.

Power of Equations: How Formulas Amplify Learning With Communication System important questions for JEE Main

JEE Main formulas are like the building blocks of success in the exam, and when combined with well-structured Important Questions, they become an indispensable tool for comprehensive understanding. As you solve your JEE Main Communication System Important Questions, incorporate the associated formulas. Understand how the formula can be used while solving the Important Questions from Communication System for JEE Main. This integration sharpens your understanding, reinforces memory, and develops problem-solving skills—critical aspects of excelling in JEE Main 2024. Download the Important JEE Main Physics Formula PDF for free from Vedantu’s website and score more in your JEE Main 2024 Examinations.

Important Equations from Communication System

1. Signal Representation:

  • Continuous-time signal: $x(t)$

  • Discrete-time signal: $x[n]$

2. Modulation:

  • Amplitude Modulation (AM):

- Carrier signal: $c(t)=A_c \cos \left(2 \pi f_c t\right)$

- Message signal: $m(t)$

- AM signal: $s(t)=A_c[1+m(t)] \cos \left(2 \pi f_c t\right)$

  • Frequency Modulation (FM):

- Instantaneous frequency deviation: $\Delta f(t)=k_f m(t)$

- FM signal: $s(t)=A_c \cos \left[2 \pi f_c t+2 \pi k_f \int_0^t m(\tau) d \tau\right]$

3. Power in AM:

  • Carrier power: $P_c=\frac{1}{2} A_c^2$

  • Sideband power: $P_{\text {sideband }}=\frac{1}{4} A_c^2$

4. Bandwidth in AM:

The bandwidth of an AM signal is given by $B W_{\mathrm{AM}}=2 \times$ max frequency in message signal

5. Transmission Efficiency in AM:

Transmission efficiency $(\eta)$ is given by $\eta=\frac{\text { Power in sidebands }}{\text { Total power }}$

6. Decibels (dB):

  • $A_{\mathrm{dB}}=10 \log _{10}\left(\frac{P_2}{P_1}\right)$

  • $P_{\mathrm{dB}}=10 \log _{10}\left(\frac{P}{P_0}\right)$

  • $L_{\mathrm{dB}}=10 \log _{10}\left(\frac{I_2}{I_1}\right)$

7. SNR in Decibels: 

\[ \text{SNR}_{\text{dB}} = 10 \log_{10} \left( \frac{S}{N} \right) \]

8. Shannon's Channel Capacity Theorem:

\[ C = B \log_2 (1 + \text{SNR}) \]

9. Noise Figure (NF):

\[ \text{NF} = 10 \log_{10} \left( \frac{\text{SNR}_{\text{out}}}{\text{SNR}_{\text{in}}} \right) \]

Check Other Important Links for JEE Main 2024 Communication System 

Explore additional resources beyond JEE Main 2024 Communication System Important Questions. Check out these other useful links that provide access to learning materials, practice papers, mock tests, and valuable insights. Enhance your preparation, overcome difficulties, and welcome achievement with these resources designed specifically for JEE Main 2024.

Excel in Your Exams with Vedantu’s JEE Main Communication System Important Questions

Communication System is a vital aspect of our interconnected world, enabling the seamless exchange of information. It encompasses various components like transmitters, receivers, and channels, all working together to transmit data effectively. The importance of clear and concise communication cannot be overstated, as it facilitates understanding and cooperation among individuals and organizations. Features like those found in the Communication System important questions for JEE Main PDFs provided by Vedantu serve as valuable resources in enhancing our communication skills. These PDFs for important questions for JEE Main Communication System aid in clarifying concepts, fostering better communication, and ultimately, empowering individuals to excel in their studies and beyond. Effective communication is the key to success, and understanding the tools and techniques behind it is essential in our modern society.

JEE Mains PYQ Chapterwise: Mastering Communication System with Past Papers

Conquering JEE Mains requires unwavering dedication and strategic preparation. One invaluable tool in your arsenal is the treasure trove of previous year question papers (PYQs). But navigating those years of questions can be overwhelming, especially for a crucial chapter like Communication System. Enter JEE Mains PYQ Chapterwise: your key to targeted practice and exam mastery in this foundational subject.

By delving into JEE Main Chapter-wise PYQs for Communication System, you gain laser-sharp focus on specific topics within this crucial domain. Imagine tackling your weakest areas, with a targeted set of past questions, building confidence and competence one problem at a time.

Whether you prefer the convenience of a JEE Mains Previous Year Questions Chapter Wise for Communication System with PDF download or prefer working directly from online resources, the benefits are undeniable. You'll hone your problem-solving skills, learn to apply theoretical knowledge to real-world scenarios involving Communication System, and develop the exam temperament needed to excel under pressure, especially when faced with Communication System questions. Remember, these questions are like blueprints for future JEE Mains papers – studying them is like peeking into the exam itself!

So, unleash the power of JEE Main PYQ Chapterwise for Communication System. Download your chosen resources, pick your weakest topic within this chapter, and start practicing. Each solved question is a step closer to your JEE Mains dream. Remember, consistency is key! Make chapterwise PYQs for Communication System a daily ritual, and watch your confidence and competence soar as you approach the exam with a laser-sharp focus and a wealth of knowledge at your fingertips, ready to conquer even the most challenging topics in Communication System.

FAQs on JEE Main - Communication System Important Questions (Free PDF Download)

1. What are some important topics in Communication System for JEE Main 2024?

In Communication System, important topics for JEE Main 2024 include Amplitude Modulation, Frequency Modulation, Antennas, Wave Propagation, Digital Communication, and Signal Processing.

2. What should I focus on when studying Frequency Modulation (FM) for Communication System?

For JEE Main 2024, pay attention to understanding the principles of Frequency Modulation (FM), the FM modulation index, and the advantages of FM over AM. A sample question could be: "Discuss the key differences between Amplitude Modulation (AM) and Frequency Modulation (FM) with suitable diagrams."

3. Are there any important questions related to Antennas in Communication System for JEE Main 2024?

Yes, there are. An important question could be:


  • Explain the basic functioning of a dipole antenna and its radiation pattern. 

  • Discuss the factors that affect antenna efficiency.

  • Explain the concept of Amplitude Modulation (AM) and its advantages in analog communication. 

  • Provide a mathematical expression for an AM signal.

4. What is the significance of Wave Propagation in Communication System for JEE Main 2024 important questions?

Wave Propagation is crucial in understanding how signals travel through different media. A potential question might be: "Explain the various modes of wave propagation, including ground wave, sky wave, and space wave, and their applications in long-distance communication."

5. How important is Digital Communication in the context of JEE Main 2024?

Digital Communication is a significant topic. An example question could be: "Describe the advantages of digital communication over analog communication. Discuss the process of pulse code modulation (PCM) and its applications."

6. Is it necessary to study the history of Communication Systems for JEE Main 2024?

While not a primary focus, understanding the historical development can provide context. You might be asked: "Briefly outline the evolution of communication systems from ancient times to modern digital communication."

7. Are there any recommended resources or books to prepare for important questions from Communication System in JEE Main 2024?

Yes, standard textbooks like "Communication Systems" by Simon Haykin and "Modern Digital and Analog Communication Systems" by B.P. Lathi are highly recommended for a comprehensive understanding.

8. How should I approach solving JEE Main 2024 Important Questions for Communication System?

To excel in Communication System, regularly solve previous years' JEE Main questions, and focus on understanding the underlying concepts. Utilize mock tests and study materials to track your progress and identify weak areas for improvement.