In satellite communication the preferable range of frequency band for down link is:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 3.7 – 4.2 GHz
Satellite communication uses microwave frequencies in the GHz range, because such waves pass through the ionosphere without being reflected. The band is split into two parts: an uplink (earth station to satellite) and a downlink (satellite to earth), on different frequencies so that the satellite's receiver is not swamped by its own transmitter.
\( \text{Uplink: } 5.925 - 6.425\,\mathrm{GHz} \)
\( \text{Downlink: } 3.7 - 4.2\,\mathrm{GHz} \)
So the downlink band is 3.7 – 4.2 GHz.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic was removed from the latest NCERT book (2026-27), and it also appears to be out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Bandwidth of Transmission Medium – …
