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

3.its use avoids receiver complexity

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


Question:
An antenna is:

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


Question:
The length of a half wave dipole at 30 mega-hertz is:

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 ∞

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)


Question:
The space waves which are affected seriously by atmospheric conditions are:

1.MF

2.HUF

3.VHF

4.UHF


Question:
The term used “to collect the information about an object and a place without physical contact” is called :

1.modulation

2.communication

3.amplification

4.remote sensing


Question:
The wavelength of a wave of frequency 10 kHz is:

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


Question:
Which of the following is not transducer?

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


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