# NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 15 Communication Systems Sample Test,Sample questions

## Question: `A loudspeaker converts:`

1.electrical signals into sound signals

2. sound signals into electrical signals

3.both (a) and (b)

4.neither (a) nor (b)

## Question: `A microphone converts:`

1.sound signals into electrical signals

2.electrical signals into sound signals

3.both (a) and (b)

4.Neither (a) nor (b)

## Question: `AM is used for broadcasting because:`

1.it is more noise immune than other modulation system

2. it requires less transmitting power compare with other systems

4.No other modulation system can provide the necessary bandwidth faithful transmission

1.Inductive

2.Capacitive

3.Resistive

4. A transformer

## Question: `Broadcasting antenna are generally:`

1.Ommi directional type

2.Vertical type

3.Horizontal type

4.None

## Question: `Communication channel consists of:`

1. transmission line only

2.optical fibre only

3.free space only

4.All the above

## Question: `Digital signals:`

1.represents values as discrete steps

2.Do not represents values as discrete steps

3.represent values steps

4.represent random steps

## Question: `In space communication, the sound waves can be sent from one place to another:`

1.through space

2.through wires

3.by superimposing it on undamped electro-magnetic waves

4.by superimposing it on damped electro-magnetic waves

## Question: `Increase in frequency deviation results into:`

1.increase in noise of FM receiver

2.decrease in noise of AM receiver

3.increase in noise of Am receiver

4.decrease in noise of FM receiver

## Question: `Name the man who was first to place his foot on the moon and in which year:`

1. Neil Armstrong, 1969

2.James Van A lien, 1971

3.Leonov, 1965

4.None of the these

## Question: `The audio frequencies range from:`

1.20 Hz to 20.000 kHz

2.20 Hz to 20 kHz

3. 20 kHz to 20.000 kHz

4.None of the these

1.5 m

2.10 m

3.25 m

4.80 m

## Question: `The modulation index in amplitude modulation is:`

1.Always zero

2.Between 0 and 1

3.Between 1 and âˆž

4. None of these

## Question: `The output of a digital computer is an example of:`

1.digital signal

2.analog signal

3.both (a) and (b)

4.neither (a) nor (b)

1.MF

2.HUF

3.VHF

4.UHF

1.modulation

2.communication

3.amplification

4.remote sensing

1.30 m

2.300 m

3.30 km

4.300 km

## Question: `Which is more advantageous?`

1. analog data communication

2.digital data communication

3. both (a) and (b) are equally good

4.depends on the situation

1.Loudspeaker

2.Amplifier

3.Microphone

4.All

## Question: `Who undertook the first space walk and in which year?`

1.Leonov 1965

2.Neil Armstrong, 1969

3.Rakesh Sharma. 1998

4.None of the above these

## More MCQS

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