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Communication Systems MCQ I Solutions
- Q15.1: Three waves A, B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication:
- Q15.1: Three waves A, B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication:
- Q15.2: A 100m long antenna is mounted on a 500m tall building. The complex can become a transmission tower for waves with $\lambda$
- Q15.2: A 100m long antenna is mounted on a 500m tall building. The complex can become a transmission tower for waves with (\lambda)
- Q15.3: A 1 KW signal is transmitted using a communication channel which provides attenuation at the rate of – 2dB per km. If the communication channel has a total length of 5 km, the power of the signal received is [gain in dB = $10 \log \frac{P_o}{P_i}$]
- Q15.3: A 1 KW signal is transmitted using a communication channel which provides attenuation at the rate of – 2dB per km. If the communication channel has a total length of 5 km, the power of the signal received is [gain in dB = (10 \log \frac{P_{i}}{P_{0}})]
- Q15.4: A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude modulation. The frequencies of the side bands will be
- Q15.4: A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude modulation. The frequencies of the side bands will be
- Q15.5: A message signal of frequency $\omega_m$ is superposed on a carrier wave of frequency $\omega_c$ to get an amplitude modulated wave (AM). The frequency of the AM wave will be
- Q15.5: A message signal of frequency (\omega_{m}) is superposed on a carrier wave of frequency (\omega_{c}) to get an amplitude modulated wave (AM). The frequency of the AM wave will be
- Q15.6: I-V characteristics of four devices are shown in Fig. 15.1 Identify devices that can be used for modulation:
- Q15.6: I-V characteristics of four devices are shown in Fig. 15.1. Identify devices that can be used for modulation:
- Q15.7: A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to
- Q15.7: A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to
- Q15.8: A basic communication system consists of (A) transmitter. (B) information source. (C) user of information. (D) channel. (E) receiver. Choose the correct sequence in which these are arranged in a basic communication system:
- Q15.8: A basic communication system consists of (A) transmitter. (B) information source. (C) user of information. (D) channel. (E) receiver. Choose the correct sequence in which these are arranged in a basic communication system:
- Q15.9: Identify the mathematical expression for amplitude modulated wave:
- Q15.9: Identify the mathematical expression for amplitude modulated wave:
Other Exercises for CBSE - Class 12 Physics Communication Systems
Chapters in CBSE - Class 12 Physics
- Electric Charges and Fields
- Electrostatic Potential and Capacitance
- Current Electricity
- Moving Charges and Magnetism
- Magnetism and Matter
- Electromagnetic Induction
- Alternating Current
- Electromagnetic Waves
- Ray Optics and Optical Instruments
- Wave Optics
- Dual Nature of Radiation and Matter
- Atoms
- Nuclei
- Semiconductor Electronics
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Faridabad, Faridabad
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I am teaching Physics from last 5 years. And within a week after getting classes from me, student falls in love with the subject. Eagerly waits for the next class.
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CUC, Gachibowli, Hyderabad
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I am avid learner of Science and have helped several students improve their understanding and hence academic performances.Currently,I am doing my Ph.d. in Mathematics from IISER Bhopal. I have done my Bachelors in Mathematics from IGNOU. I have also completed M.Sc. in Pure Mathematics from University of Hyderabad in 2024. I have successfully managed to clear GATE, NET JRF in Mathematical science..To spread my love for Mathematics and Physics I have been teaching Mathematics and Physics for the past 6 years (std 9-12, B.Sc and M.Sc). So ,If you want to understand the concepts of mathematics and physics, I am here to help you with that. I also provide Customized notes and exercise to focus on the area of improvement .Classes are recorded so that you can go through them anytime and refresh/ revise the topics. I have all the necessary tools for online classes. So, hope to see you in Demo.
It was a very nice experience. He went very in-depth and clear. It was very useful. I studied maths for CBSE board.
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Sukhlia, Indore
4 yrs of
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I am pursuing a Ph.D. in Economics from DAVV Indore. I have completed Master of Business Administration. I have also completed a Bachelor of Engineering in Computer Science. I am UGC NET qualified in Economics. and I have more than 4 years of experience in teaching.
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Ashok Nagar D' Souza Layout, Bangalore
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Total Years of Experience: Over [X years] of experience in teaching across various academic levels, focusing on delivering engaging, student-centered education. 2. Educational Levels Taught: Primary, Secondary, and Senior Secondary levels Undergraduate-level classes (if applicable) Coaching for competitive exams (NEET, JEE, UPSC, etc.) 3. Key Responsibilities: Planning and delivering lessons based on prescribed curriculum. Assessing students’ understanding through regular tests, quizzes, and assignments. Using various teaching methodologies including lectures, group activities, demonstrations, and ICT tools. Providing remedial classes for weak students and enrichment activities for high performers. Maintaining discipline, fostering motivation, and ensuring an inclusive classroom environment. 4. Classroom Management: Successfully managed classrooms of 30–60 students. Promoted active participation and collaborative learning. Ensured timely syllabus completion while maintaining quality of instruction. 5. Communication and Interaction: Maintained regular communication with parents regarding student progress. Participated in parent-teacher meetings, academic planning sessions, and faculty training programs. 6. Technology Integration: Used smart boards, PowerPoint presentations, online quizzes, and digital simulations to enhance learning outcomes. Conducted online classes using platforms like Google Meet, Zoom, and Microsoft Teams during the COVID-19 pandemic. 7. Co-curricular and Administrative Roles: Organized and participated in educational tours, science exhibitions, and debate competitions. Assisted in exam invigilation, results compilation, and record keeping. 8. Achievements and Impact: Improved student performance and pass percentage year-on-year. Received positive feedback from students and parents for teaching effectiveness and approachability. Mentored students who went on to excel in competitive exams and higher education
had a great learning experience under the guidance of my History teacher. Their teaching style is clear, engaging, and well-structured. Complex topics like the Nationalism in India, Partition, and World War themes were explained with such depth and simplicity that it made understanding and remembering easy. They don’t just teach dates and events—they bring history to life with stories, critical thinking, and real-world connections. Regular assessments, personalized feedback, and doubt-clearing sessions really helped me improve my writing and analytical skills. Highly recommended for any Class 12th student aiming for high marks in board exams!
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Mahipalpur, Delhi
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As an experienced teacher for 12 years, I have been teaching to make students interested in the subjects of Maths. My attitude is to help children improve in studies in the best possible way.
