Tag: communication systems

Questions Related to communication systems

Internet uses 

different modes of communication and their uses information technology communication systems physics

  1. Packet switching

  2. Circuit switching

  3. Telephone switching

  4. Telex switching

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Correct Option: A
Explanation:

Packet-switched describes the type of network in which relatively small units of data called packets are routed through a network based on the destination address contained within each packet. Breaking communication down into packets allows the same data path to be shared among many users in the network. This type of communication between sender and receiver is known as connectionless (rather than dedicated). Most traffic over the Internet uses packet switching and the Internet is basically a connectionless network.

Desirable properties of a website are  

different modes of communication and their uses information technology communication systems physics

  1. a meaningful address

  2. Help and search facilities

  3. Links to related sites

  4. Features to allow users to give feedback

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Correct Option: B

The difficulty to recognize the speaker's voice over the telephone is due to poor quality of sound.

different modes of communication and their uses information technology communication systems physics

  1. True

  2. False

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Correct Option: A
Explanation:

The bandwidth used to transmit telephone signals is very low , it is generally around $4 KHZ$ in range .So, the quality of audio signals is low , therefore make it difficult to recognize the speaker's voice .

In modern day technologies . the bandwidth of the audio signals is however increased to around $9 KHZ$

Basic components of a transmitter are 

different modes of communication and their uses information technology communication systems physics

  1. message signal generator and antenna

  2. modulator and antenna

  3. signal generator and modulator

  4. message signal generator, modulator and antenna

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Correct Option: A
Explanation:

The basic component of a transmitter are.

1. message signal
2. generator
3. antenna
The correct option is A.

Government has divided the carrier frequency range from 30 Mhz to 60 Mhz between 20 stations which are independently beaming their signals. Which of the signals can be beamed by each of the stations :-

different modes of communication and their uses information technology communication systems physics

  1. Voice signals only

  2. Music signals and voice signals only

  3. TV Signals, Music Signals as well as voice signals

  4. Music signals only

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Correct Option: A

_________  converts the light from T.V camera to VF signals.

different modes of communication and their uses information technology communication systems physics

  1. Amplifier

  2. Receiver

  3. Photo cell

  4. Rectifier

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Correct Option: C
Explanation:

Photocell are used for the conversion light to frequency signals. So, In television the light from T.V camera is converted to video frequency signals that are further processed

Channel selection is selection of ________  of a T.V. station.

different modes of communication and their uses information technology communication systems physics

  1. area

  2. range

  3. frequency

  4. channel

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Correct Option: C
Explanation:
On a television, the signals are transmitted at different frequencies from a T.V station. Different band of frequencies is allocated to different channels wherever changing a channel in a T.V., we are actually selecting to different frequencies.

Depending upon the frequency of the ____________  emitted by remote control, a channel is selected, by the ________  sensor.

different modes of communication and their uses information technology communication systems physics

  1. infrared radiations,microwave

  2. X-rays, X-ray

  3. infrared radiations,infrared

  4. radio waves,infrared

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Correct Option: C
Explanation:
Remote control always use infrared light , as it will not penetrate through the walls of the room and also carry enough information for a required signal.

What is ISD in telephonic communication ? 

different modes of communication and their uses information technology communication systems physics

  1. Inter Subscriber Dialing

  2. Inter Secure Dialing

  3. International Subscriber Dialing

  4. Intercom Simple Dialing

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Correct Option: C
Explanation:

ISD is International Subscriber Dialing . It is placing an international telephone call that is dialed directly by a telephone Subscriber , rather than by a telephone operator .

Calls are initiated by dialing the International call prefix for the originating  country ,followed by the country calling code for the  destination country , and finally the national telephone number of the destination.

 The remote control handset of T.V makes use of _________ of very low frequency.

different modes of communication and their uses information technology communication systems physics

  1. microwaves

  2. infrared radiations

  3. visible rays

  4. radio waves

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Correct Option: B
Explanation:

The infrared radiation of low frequency are used in remote control handset of T.V .The low powered infrared waves make sure the signals sent from your remote does not penetrate the walls and interfere with outside surroundings .