6. ……. Is the unit of loudness.
(a) Decibel
(b) Mel
(c) Phon
(d) Sone
7. ….. is the power ratio of one decibel.
(a) 1.26 : 1
(b) 2 : 1
(c) 5 : 1
(d) 10 : 1
8. The ionosphere consists of ……. Layer.
(a) Positive charge
(b) Negative charge
(c) Neutral
(d) Any of the other
9. The channel capacity is exactly equal to which of the following ?
(a) Noise rate in the channel
(b) Bandwidth of demand
(c) Amount of information per second
(d) None
10. Sampling theorem finds application in :
(a) Frequency modulation
(b) Amplitude modulation
(c) PCM
(d) None of the above
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