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CBSE - XII Science - Physics - Communication Systems
Can you please tell me what is broadcast communication?
Asked by haazrasharif04
11th March 2020,
8:08 PM
CBSE - XII Science - Physics - Communication Systems
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Asked by abhitailor158
6th March 2019,
5:54 PM
CBSE - XII Science - Physics - Communication Systems
Optical communication using fibres is performed in the frequency range of
Asked by jay7venture
30th August 2018,
8:09 PM
CBSE - XII Science - Physics - Communication Systems
The characteristic impedence of a coaxial wire line is of order
Asked by jay7venture
30th August 2018,
8:05 PM
CBSE - XII Science - Physics - Communication Systems
1.suppose you wish to transmit an electro signal in the audio frequency range over a long distance directly .write briefly the three important factors which prevent you from doing so and explain how you overcome these factors?
2.for an amplitudec modulated wave the maximum amplitude is found to be 10 v while the minimum amplitude is 2v .determine the value of modulation index u
what would be the value of u if the minimum amplitude is zero volt?why is u generally kept less than !?
Asked by mahamood.iphone
23rd December 2015,
7:37 AM
CBSE - XII Science - Physics - Communication Systems
Give reasons
a) For ground wave transmission , size of antenna should be comparable to the wavelength of signal eg - 
b) Audio signals converted into electromagnetic waves are not transmitted as such directly .
c) The amplitude of modulating signal is kept less than that of carrier wave.
Asked by vinitapahel123
9th December 2015,
6:02 PM
CBSE - XII Science - Physics - Communication Systems
(a) Distinguish between ‘Analog’ and ‘Digital’ forms of communication. (b) Explain briefly two commonly used applications of the ‘Internet’.
Asked by Topperlearning User
8th July 2015,
12:54 PM
CBSE - XII Science - Physics - Communication Systems
(b) What is the minimum number of satellites that enables a Global Positioning System (GPS) receiver to determine one’s longitude/latitude position, i.e., to make a 2D position fix.
Asked by Malavika Umesh
26th February 2015,
10:21 AM
CBSE - XII Science - Physics - Communication Systems
What is the difference between Transmitter and Transducer. Explain with example ??
Asked by Shivansh Rawat
24th November 2014,
5:46 PM
CBSE - XII Science - Physics - Communication Systems
a) Distinguish between 'Analog and Digital signals'. b) Mention the function of any two of the following used in communication system: (i) Transducer (ii) Repeater (iii) transmitter (iv) Bandpass Filter
Asked by Topperlearning User
10th July 2014,
5:54 PM
CBSE - XII Science - Physics - Communication Systems
What is a digital signal?Write two advantages of digital communication. Give any one difference between Fax and E-mail systems of communication.
Asked by Topperlearning User
9th July 2014,
10:55 AM
CBSE - XII Science - Physics - Communication Systems
Draw a schematic diagram showing the (i) ground wave (ii) sky wave and (iii) space wave propagation modes for em waves. Write the frequency range for each of the following: (i) Standard AM broadcast (ii) Television (iii) Satellite communication
Asked by Topperlearning User
8th July 2014,
9:03 AM
CBSE - XII Science - Physics - Communication Systems
What is space wave propagation? Give two examples of communication system which use space wave mode. A TV tower is 80 m tall. Calculate the maximum distance upto which the signal transmitted from the tower can be received.
Asked by Topperlearning User
8th July 2014,
8:42 AM
CBSE - XII Science - Physics - Communication Systems
On a particular day, the maximum frequency reflected from the ionosphere is 10 MHz. On another day, it was found to decrease to 8 MHz. Calculate the ratio of the maximum electron densities of the ionosphere on the two days.
Asked by Topperlearning User
8th July 2014,
8:22 AM
CBSE - XII Science - Physics - Communication Systems
Briefly explain the ground wave propagation of radio waves.
Asked by Topperlearning User
8th July 2014,
8:07 AM
CBSE - XII Science - Physics - Communication Systems
The figure shows the block diagram of a receiver: (a) Identify 'X' and 'Y' (b) Write their functions.
Asked by Topperlearning User
7th July 2014,
3:26 PM
CBSE - XII Science - Physics - Communication Systems
Explain the function of a repeater in a communication system.
Asked by Topperlearning User
7th July 2014,
3:15 PM
CBSE - XII Science - Physics - Communication Systems
Why cannot the (i) ground waves (ii) space waves and (iii) sky waves be sustained for long distance communication beyond 10 to 20 MHz ? What is meant by critical frequency for sky wave propagation ? Write an expression for the critical frequency in terms of the maximum electron density of the ionosphere.
Asked by Topperlearning User
7th July 2014,
1:37 PM
CBSE - XII Science - Physics - Communication Systems
Which mode of propagation is used by short wave broadcast services having frequencies range from a few MHz upto 3 MHz? What do you understand by space wave propagation?Why ground wave propagation is not suitable for high frequency?
Asked by Topperlearning User
7th July 2014,
1:21 PM
CBSE - XII Science - Physics - Communication Systems
Why are sky waves reflected back from the ionosphere?
Asked by Topperlearning User
7th July 2014,
12:56 PM
CBSE - XII Science - Physics - Communication Systems
What is a band pass filter?
Asked by Topperlearning User
7th July 2014,
12:37 PM
CBSE - XII Science - Physics - Communication Systems
Write the expression of a TV station, area and the population covered by the transmission.
Asked by Topperlearning User
7th July 2014,
12:34 PM
CBSE - XII Science - Physics - Communication Systems
Sky waves are not used in transmitting TV signals. Why? How can the range of TV signals be increased?
Asked by Topperlearning User
7th July 2014,
12:24 PM
CBSE - XII Science - Physics - Communication Systems
What do you mean by bandwidth of a signal? How much bandwidth is considered adequate for (i) speech signal (ii) music signal (iii) video and TV signals?
Asked by Topperlearning User
7th July 2014,
9:22 AM
CBSE - XII Science - Physics - Communication Systems
What do you understand by line communication and space communication? Give example.
Asked by Topperlearning User
7th July 2014,
9:13 AM
CBSE - XII Science - Physics - Communication Systems
What do you mean by point to point communication and broadcast? Give examples.
Asked by Topperlearning User
3rd July 2014,
3:22 PM
CBSE - XII Science - Physics - Communication Systems
What do you mean by analog and digital communication system?
Asked by Topperlearning User
3rd July 2014,
3:12 PM
CBSE - XII Science - Physics - Communication Systems
Briefly describe the three basic parts of communication system.
Asked by Topperlearning User
3rd July 2014,
3:08 PM
CBSE - XII Science - Physics - Communication Systems
can u plz elaborate it sir/mam, that why does gravitational force bind d heavy objects like sun and planets...as i didnt understand it completely from ua last ans...
Asked by Kalyanrao Chavan
1st July 2014,
2:16 PM
CBSE - XII Science - Physics - Communication Systems
even-though ,,gravitational force is very weak force ,how does it still bind all d planets,moon n d heavy sun?
Asked by Kalyanrao Chavan
30th June 2014,
12:56 PM
CBSE - XII Science - Physics - Communication Systems
Name the type of communication in which the signal is a discrete and binary version of the message or information.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Communication Systems
Why do long distance radio broadcast use short wave bands?
Asked by Topperlearning User
4th June 2014,
1:23 PM
