Match List I with List IILIST ILIST IIA.RepeaterI.converts one form o…

The correct answer is Option (2) → A-III, B-IV, C-I, D-II

A communication system has a transmitter, a channel and a receiver. Each term in List I names one part or one property of such a system.

(A) Repeater — this matches (III) A combination of a receiver and a transmitter. A repeater picks up the signal, amplifies it and sends it out again, so it extends the range of the system; it receives like a receiver and retransmits like a transmitter.

(B) Bandwidth — this matches (IV) portion of the spectrum occupied by the signal. The bandwidth is the range of frequencies over which the signal is spread, for example about 3 kHz for speech.

(C) Transducer — this matches (I) converts one form of energy into another. A microphone (sound to electrical energy) and a loudspeaker (electrical to sound energy) are transducers.

(D) Signal — this matches (II) information converted in electrical form and suitable for transmission. Speech, music or data is first changed into an electrical signal, which can then be sent over the channel.

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 – “… (i) Transducer: Any device that converts one form of energy into another can be termed as a transducer. …
(ii) Signal: Information converted in electrical form and suitable for transmission is called a signal. …
(ix) Bandwidth: Bandwidth refers to the frequency range over which an equipment operates or the portion of the spectrum occupied by the signal. …
(xii) Repeater: A repeater is a combination of a receiver and a transmitter.”