Previous year MCQs

General science UPPSC 2017 GS-I
Question

Television viewers using dish antenna to receive satellite signals do not receive signals during rain because:

(A) Of the small size of the antenna.
(B) Rain droplets absorb the energy of radio waves.
(C) Rain droplets disperse the energy of radio waves from their original direction.

Which of the above statements are correct?

Answer & Solution

Answer: (Detailed Solution Below)

Option D: A, B and C

Detailed Solution:

The correct answer is “A, B and C”.
All three options contribute to the loss of satellite signals during rain:

1) While not the primary factor, the size of the antenna can play a role in signal reception, especially in extreme conditions.

2) Rain droplets can absorb some of the radio wave energy, reducing the signal strength.

3) This is the most significant factor. Rain droplets scatter the radio waves in various directions, dispersing their energy and weakening the signal that reaches the antenna.

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