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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
Top Tutors who teach Communication Systems
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Madhurawada, Visakhapatnam
20 yrs of
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I mentored several students for CBSE/ICSE/STATE/NIOS CLASS 12 in PHYSICS for the last 24 years.
Good teaching and knowledge and fun to learn not strict and a fun teacher everything is good with him
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Lekha Nagar, Nashik
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Taught 6 years in Junior College for class12 ( Science and Commerce stream ) as a Math teacher.
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Virugambakkam, Chennai
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My students get acquainted with me easily... I will be both friendly and strict ( according to the need)... Students love to learn physics with me. Their learning process will be in easy and efficient. They will Excel in concepts and problem solving
She is very talented and knowledgeable tutor. She taught me 12th board CBSE Physics very well. She explained the concepts clearly even I asked multiple times. She is my motivator. Apart from her teaching, She is very friendly and has a fun motive. I have scored 95% in Physics. All my credits and thanks to her.
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Ashok Nagar, Delhi
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I am teacher with over experience of 20 years. Provides complete notes and assignment. And make subject more understanding and easy.
I’ve had a great experience learning under my Accounts tuition teacher. Their way of explaining concepts is clear, practical, and easy to understand, even for tough topics like journal entries, ledgers, and financial statements. They are patient, punctual, and always open to doubts—no matter how many times I ask. Thanks to their guidance, I’ve not only improved my grades but also developed a genuine interest in the subject. Their real-world examples make learning more engaging and help me understand the application of concepts beyond the textbook.
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Dwarka Sector 1, Delhi
13 yrs of
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I have been teaching Class 12 Mathematics for years, helping students understand difficult concepts with simple explanations and step-by-step guidance. My focus is on making math easy—especially chapters like Calculus, Matrices, Determinants, Vectors, and 3D Geometry. I provide regular practice, chapter-wise tests, and personalized feedback so students know exactly where to improve. Many of my students have gained confidence and improved their scores through clear concepts and exam-oriented preparation.
