Tag: physics

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Questions Related to physics

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

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

  1. 1925

  2. 1926

  3. 1927

  4. 1928
Reveal answer Fill a bubble to check yourself
C Correct answer
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.
Multiple choice physics communication system elements of a communication system elements of communication system electromagnetic waves and communication system

A receiver in a communication system must have

  1. Pick-up antenna

  2. Demodulator

  3. Amplifier

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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 .

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

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

  1. sub-channeling

  2. signal switching

  3. SINAD

  4. multiplexing
Reveal answer Fill a bubble to check yourself
D Correct answer
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

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

A complete communication system must include:

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

An antenna is a device that converts

  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
Reveal answer Fill a bubble to check yourself
C,D Correct answer
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.