Tag: physics

Questions Related to physics

In which year, the radio broadcasting had started in India?

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. 1925

  2. 1926

  3. 1927

  4. 1928

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Correct Option: C
Explanation:
According to an agreement of 23 July 1927, the private Indian Broadcasting Company LTD (IBC) was authorised to operate two radio stations; the Bombay station began on 23 July 1927, and the Calcutta station followed on 26 August 1927.

The waves used in telecommunication are

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Infrared

  2. Ultraviolet

  3. Microwaves

  4. Cosmic rays

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Correct Option: C
Explanation:

In general Radio waves are used to transmit television and radio programs and Microwaves are used to transmit satellite television and for mobile phones.

A receiver in a communication system must have

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Pick-up antenna

  2. Demodulator

  3. Amplifier

  4. All of these

Show answer
Correct Option: A
Explanation:

A receiver in a communication system must have a pick-up antenna , a demodulator and an amplifier . A pick-up antenna is used to receive the signal . Then demodulator , separates the carrier wave from original signal . And amplifier , gives strength to the weak original signal .

When two or more signals share a common channel, it is called:

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. sub-channeling

  2. signal switching

  3. SINAD

  4. multiplexing

Show answer
Correct Option: D
Explanation:

When more than one signal shares a common channel for broadcasting, the method is known as multiplexing. The sent signal will be a single, complex signal and the receiver recovers the separate signals by a process called demultiplexing

A complete communication system must include:

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. a transmitter and receiver

  2. a transmitter, a receiver, and a channel

  3. a transmitter, a receiver, and a spectrum analyzer

  4. a multiplexer, a demultiplexer, and a channel

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Correct Option: C
Explanation:

A communication system requires a transmitter to upload the signal, a receiver to receive the signal and a channel to carry this information

An antenna is a device that converts

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. electromagnetic energy into radio frequency

    signal

  2. radio frequency signal into electromagnetic

    energy

  3. guided electromagnetic waves into free space

    electromagnetic waves

  4. free space electromagnetic waves into guided

    electromagnetic waves

Show answer
Correct Option: C,D
Explanation:

$Answer:-$ C ,D

An antenna (plural antennae or antennas), or aerial, is an electrical device which converts electric power (guided electromagnetic waves) into radio waves(free spaceelectromagnetic waves), and vice versa. It is usually used with a radio transmitter or radio receiver.

Basically, a communication system is a 

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Transmitter

  2. Receiver

  3. Messenger

  4. all of these

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Correct Option: D

The collection of communication line and routers form the:

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. Router

  2. Bridge

  3. Submet

  4. Packet

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Correct Option: C
Explanation:

The collection of communication line and routers from the subnet.

The modulation frequency of an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license what broadcast frequency will you allot ?

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. 2250 kHz

  2. 2900 kHz

  3. 2750 kHz

  4. 2000 kHz

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Correct Option: A

To double the covering range of a TV transmission tower, its height should be multiplied by :

physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

  1. 2

  2. 4

  3. $

    \sqrt{2}

    $

  4. $

    \frac{1}{\sqrt{2}}

    $

Show answer
Correct Option: A