MHT-CET

32. Communication System question bank (Physics)

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Q1.

In a communication system,the range for line-of-sight propagation on Earth is $d$ for an antenna height of $h$. If $h$ is doubled,then the new range is:

(A)
$\frac{d}{\sqrt{2}}$
(B)
$\frac{\sqrt{2}}{d}$
(C)
$\frac{d}{2}$
(D)
$\sqrt{2} d$
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Q2.

In amplitude modulation,

(A)
both amplitude and frequency do not change according to information signal.
(B)
amplitude remains constant but frequency changes according to information signal.
(C)
both amplitude and frequency change according to information signal.
(D)
amplitude of carrier wave changes according to information signal.
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