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CBSE - Class 12 > Physics > Communication Systems Worksheets

Free CBSE - Class 12 Physics - Communication Systems worksheets

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1.
An audio signal is modulated by a carrier wave of 20MHz such that the bandwidth required for modulation is 3kHz. Could this wave be demodulated by a diode detector which has the values of (R) and (C) as
(i) (R = 1 \text{ k}\Omega), (C = 0.01\mu\text{F}).
2.
An audio signal is modulated by a carrier wave of 20MHz such that the bandwidth required for modulation is 3kHz. Could this wave be demodulated by a diode detector which has the values of (R) and (C) as
(ii) (R = 10 \text{ k}\Omega), (C = 0.01\mu\text{F}).
3.
An audio signal is modulated by a carrier wave of 20MHz such that the bandwidth required for modulation is 3kHz. Could this wave be demodulated by a diode detector which has the values of (R) and (C) as
(iii) (R = 10 \text{ k}\Omega), (C = 0.1\mu\text{F}).
4.
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:
1. A is transmitted via space wave while B and C are transmitted via sky wave. 2. A is transmitted via ground wave, B via sky wave and C via space wave. 3. B and C are transmitted via ground wave while A is transmitted via sky wave. 4. B is transmitted via ground wave while A and C are transmitted via space wave.
5.
A 100m long antenna is mounted on a 500m tall building. The complex can become a transmission tower for waves with (\lambda)
1. ~ 400 m. 2. ~ 25 m. 3. ~ 150 m. 4. ~ 2400 m.
6.
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}})]
1. 900 W. 2. 100 W. 3. 990 W. 4. 1010 W.
7.
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
1. 1.003 MHz and 0.997 MHz. 2. 3001 kHz and 2997 kHz. 3. 1003 kHz and 1000 kHz. 4. 1 MHz and 0.997 MHz.
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:
1. ABCDE. 2. BADEC. 3. BDACE. 4. BEADC.
9.
Which of the following would produce analog signals and which would produce digital signals?
(i) A vibrating tuning fork.
10.
Which of the following would produce analog signals and which would produce digital signals?
(ii) Musical sound due to a vibrating sitar string.
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Dr. mamatha C. Communication Systems in Bangalore

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Dr. mamatha C.
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Manohar sir is a professional teacher who created interest in Maths for me. I was doing average in Maths till 10th. But after taking his classes, my grades improved now in 11th and also I'm interested in maths. He also helped me in Physics and Chemistry. His teaching is really interesting. He also clears any doubt with a lot of patience.

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Top Concept Videos in Physics Communication Systems

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Signals Transmitting Information Across Distances

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