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Alternating Current Atoms Class 9 to 12th physics Communication Systems Current Electricity Dual Nature of Radiation and Matter Electric Charges and Fields Electromagnetic Induction Electromagnetic Waves Electrostatic Potential and Capacitance Magnetism and Matter Moving Charges and Magnetism Nuclei Ray Optics and Optical Instruments Semiconductor Electronics Unit 1-Electrostatics Unit 10-Communication Systems Unit 2-Current Electricity Unit 3-Magnetic Effect of Current & Magnetism Unit 4-Electromagnetic Induction & Alternating Current Unit 5-Electromagnetic Waves Unit 6-Optics Unit 7-Dual Nature of Matter Unit 8-Atoms & Nuclei Unit 9-Electronic Devices Wave Optics

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Free CBSE - Class 12 Physics worksheets

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

1.
Which of the following would produce analog signals and which would produce digital signals?
(iii) Light pulse.
2.
Which of the following would produce analog signals and which would produce digital signals?
(iv) Output of NAND gate.
3.
Would sky waves be suitable for transmission of TV signals of 60 MHz frequency?
4.
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?
5.
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?
6.
Compute the (LC) product of a tuned amplifier circuit required to generate a carrier wave of 1 MHz for amplitude modulation.
7.
Why is a AM signal likely to be more noisy than a FM signal upon transmission through a channel?
8.
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}).
9.

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.

10.
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.
- OR -

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Free CBSE Worksheets

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Alternating Current Atoms Class 9 to 12th physics Communication Systems Current Electricity Dual Nature of Radiation and Matter Electric Charges and Fields Electromagnetic Induction Electromagnetic Waves Electrostatic Potential and Capacitance Magnetism and Matter Moving Charges and Magnetism Nuclei Ray Optics and Optical Instruments Semiconductor Electronics Unit 1-Electrostatics Unit 10-Communication Systems Unit 2-Current Electricity Unit 3-Magnetic Effect of Current & Magnetism Unit 4-Electromagnetic Induction & Alternating Current Unit 5-Electromagnetic Waves Unit 6-Optics Unit 7-Dual Nature of Matter Unit 8-Atoms & Nuclei Unit 9-Electronic Devices Wave Optics

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