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12 tution 26 years experience for 12 Accountancy Arts / Humanities Biology Business Studies Chemistry Commerce Economics English Entrepreneurship Geography Hindi History ISC Grade 12 Chemistry Jee physics and maths for 12 Mathematics Physics Political Science Part I Political Science Part II Psychology Science Sociology

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CBSE - Class 12 Worksheets

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Here is a Sample Worksheet for you to Practice. Download this worksheet to see the answers.

1.
Two waves $A$ and $B$ of frequencies 2 MHz and 3 MHz, respectively are beamed in the same direction for communication via sky wave. Which one of these is likely to travel longer distance in the ionosphere before suffering total internal reflection?
2.
The maximum amplitude of an A.M. wave is found to be 15 V while its minimum amplitude is found to be 3 V. What is the modulation index?
3.
Compute the LC product of a tuned amplifier circuit required to generate a carrier wave of 1 MHz for amplitude modulation.
4.
Why is a AM signal likely to be more noisy than a FM signal upon transmission through a channel?
5.
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 = $10 \log \frac{P_o}{P_i}$]
1. 900 W. 2. 100 W. 3. 990 W. 4. 1010 W.
6.
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
1. $\omega_m$. 2. $\omega_c$. 3. $\frac{\omega_c + \omega_m}{2}$. 4. $\frac{\omega_c - \omega_m}{2}$.
7.

I-V characteristics of four devices are shown in Fig. 15.1 Identify devices that can be used for modulation:

1.

‘i’ and ‘iii’.

 2.

only ‘iii’.

 3.

‘ii’ and some regions of ‘iv’.

 4.

All the devices can be used.
8.
A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to
1. poor selection of modulation index (selected $0 < m < 1$) 2. poor bandwidth selection of amplifiers. 3. poor selection of carrier frequency 4. loss of energy in transmission.
9.
An audio signal of 15kHz frequency cannot be transmitted over long distances without modulation because
1. the size of the required antenna would be at least 5 km which is not convenient. 2. the audio signal can not be transmitted through sky waves. 3. the size of the required antenna would be at least 20 km, which is not convenient. 4. effective power transmitted would be very low, if the size of the antenna is less than 5 km.
10.
Audio sine waves of 3 kHz frequency are used to amplitude modulate a carrier signal of 1.5 MHz. Which of the following statements are true?
1. The side band frequencies are 1506 kHz and 1494 kHz. 2. The bandwidth required for amplitude modulation is 6kHz. 3. The bandwidth required for amplitude modulation is 3 MHz. 4. The side band frequencies are 1503 kHz and 1497 kHz.
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