The loss of strength of a signal while propagating through a medium is known as :
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Attenuation
In a communication system a signal travelling through a channel (air, cable, optical fibre) gradually loses power through absorption and spreading. This loss of strength of the signal is called attenuation.
Note: The same question was also asked in CUET (UG) 2023 on 10-06-2023 (Slot 1), and a similar question in CUET (UG) 2023 on 06-06-2023 (Slot 1).
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):
Basic Terminology Used in Electronic Communication Systems – “… (vi) Attenuation: The loss of strength of a signal while propagating through a medium is known as attenuation.”