Who undertook the first space walk and in which year?
  • Leonov 1965
  • Neil Armstrong, 1969
  • Rakesh Sharma. 1998
  • None of these
The term used “to collect the information about an object and a place without physical contact” is called :
  • modulation
  • communication
  • amplification
  • remote sensing
The velocity of electromagnetic wave is:
  • 3 × 105 ms-1
  • 3 × 106 ms-1
  • 3 × 108 ms-1
  • 3 × 1010 ms-1
The audio frequencies range from:
  • 20 Hz to 20.000 kHz
  • 20 Hz to 20 kHz
  • 20 kHz to 20.000 kHz
  • None of these
The wavelength of a wave of frequency 10 kHz is:
  • 30 m
  • 300 m
  • 30 km
  • 300 km
The area served by an antenna of height 100 m is:
  • 109m²
  • 4 × 109 m²
  • 6 × 109m²
  • 8 × 1010m²
Which of the following is not transducer?
  • Loudspeaker
  • Amplifier
  • Microphone
  • All
The space waves which are affected seriously by atmospheric conditions are:
  • MF
  • HUF
  • VHF
  • UHF
An antenna is:
  • Inductive
  • Capacitive
  • Resistive
  • A transformer
Broadcasting antenna are generally:
  • Ommi directional type
  • Vertical type
  • Horizontal type
  • None
The modulation index in amplitude modulation is:
  • Always zero
  • Between 0 and 1
  • Between 1 and ∞
  • None of these
The output of a digital computer is an example of:
  • digital signal
  • analog signal
  • both (a) and (b)
  • neither (a) nor (b)
Name the man who was first to place his foot on the moon and in which year:
  • Neil Armstrong, 1969
  • James Van A lien, 1971
  • Leonov, 1965
  • None of these
A microphone converts:
  • sound signals into electrical signals
  • electrical signals into sound signals
  • both (a) and (b)
  • Neither (a) nor (b)
A loudspeaker converts:
  • electrical signals into sound signals
  • sound signals into electrical signals
  • both (a) and (b)
  • neither (a) nor (b)
The sound produced by a tuning fork is a sort of:
  • analog signal
  • digital signal
  • both (a) and (b)
  • neither (a) nor (b)
The length of a half wave dipole at 30 mega-hertz is:
  • 5 m
  • 10 m
  • 25 m
  • 80 m
In space communication, the sound waves can be sent from one place to another:
  • through space
  • through wires
  • by superimposing it on undamped electro-magnetic waves
  • by superimposing it on damped electro-magnetic waves
Which is more advantageous?
  • analog data communication
  • digital data communication
  • both (a) and (b) are equally good
  • depends on the situation
Communication channel consists of:
  • transmission line only
  • optical fibre only
  • free space only
  • All of the above
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