1. Who undertook the first space walk and in which year ?

(A) Leonov, 1965
(B) Neil Armstrong, 1969
(C) Rakesh Sharma, 1998
(D) None of these

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

(A) modulation
(B) communication
(C) amplification
(D) remote sensing

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3. The velocity of electromagnetic wave is :

(A) 3 x 10⁵ ms^-1
(B) 3 x 10⁶ ms^-1
(C) 3 x 10⁸ ms^-1
(D) 3 x 10¹⁰ ms^-1

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4. The audio frequencies range from :

(A) 20 Hz to 20,000 kHz
(B) 20 Hz to 20 kHz
(C) 20 kHz to 20,000 kHz
(D) None of these

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5. The wavelength of a wave of frequency 10 kHz is :

(A) 30 m
(B) 300 m
(C) 30 km
(D) 300 km

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6. The area served by an antenna of height 100 m is :

(A) 10⁹ m²
(B) 4 x 10⁹ m²
(C) 6 x 10⁹ m²
(D) 8 x 10¹⁰ m²

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7. Which of the following is not transducer ?

(A) Loudspeaker
(B) Amplifier
(C) Microphone
(D) All

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8. The space waves which are affected seriously by atmospheric conditions are :

(A) MF
(B) HUF
(C) VHF
(D) UHF

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9. An antenna is :

(A) Inductive
(B) Capacitive
(C) Resistive
(D) A transformer

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10. Broadcasting antenna are generally :

(A) Ommi directional type
(B) Vertical type
(C) Horizontal type
(D) None

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11. The modulation index in amplitude modulation is :

(A) Always zero
(B) Between 0 and 1
(C) Between 1 and ∞
(D) None of these

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12. The output of a digital computer is an example of :

(A) digital signal
(B) analog signal
(C) both (A) and (B)
(D) neither (A) nor (B)

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13. Name the man who was first to place his foot on the moon and in which year :

(A) Neil Armstrong, 1969
(B) James Van Allen, 1971
(C) Leonov, 1965
(D) None of these

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14. A microphone converts :

(A) sound signals into electrical signals
(B) electrical signals into sound signals
(C) both (A) and (B)
(D) Neither (A) nor (B)

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15. A loudspeaker converts :

(A) electrical signals into sound signals
(B) sound signals into electrical signals
(C) both (A) and (B)
(D) neither (A) nor (B)

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16. The sound produced by a tuning fork is a sort of:

(A) analog signal
(B) digital signal
(C) both (A) and (B)
(D) neither (A) nor (B)

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17. The length of a half wave dipole at 30 mega hertz is :

(A) 5 m
(B) 10 m
(C) 25 m
(D) 80 m

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18. In space communication, the sound waves can be sent from one place to another :

(A) through space
(B) through wires
(C) by superimposing it on undamped electro magnetic waves
(D) by superimposing it on damped electro magnetic waves

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19. The output of a digital computer is an example of:

(A) digital signal
(B) analog signal
(C) both (A) and (B) above
(D) neither (A) nor (B)

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20. Which is more advantageous ?

(A) analog data communication
(B) digital data communication
(C) both (A) and (B) are equally good
(D) depends on the situation

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21. A byte is a string of n bits. Then n equals :

(A) 8
(B) 6
(C) 4
(D) 2

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22. When the modulation percentage is 75, an AM transmitter produces 10 kW. How much of this is carrier power ?

(A) 10 kW
(B) 12.30 kW
(C) 7.5 kW
(D) 7.81 kW

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23. The range of frequencies allotted for commercial FM radio broadcast is :

(A) 88 to 108 MHz
(B) 88 to 108 kHz
(C) 8 to 889 MHz
(D) None of these

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24. The range of frequencies allotted for commercial VHF TV broadcast is :

(A) 76-88 MHz
(B) 54-72 MHz
(C) 174-216 MHz
(D) None of these

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25. The range of frequencies allotted for commercial UHF TV broadcast is :

(A) 76-88 MHz
(B) 54-72 MHz
(C) 174-216 MHz
(D) None of these

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26. Basically a communication system is a:

(A) transmitter
(B) receiver
(C) messenger
(D) None of these