Which of the following is a transducer?

The correct answer is Option (1) → Loud speaker

A transducer is a device that converts energy from one form to another, such as a pressure or sound signal into an electrical signal, or the reverse.

Option (1) Loud speaker — Correct. A loudspeaker converts the electrical signal into sound, so it is a transducer.

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 – “… Any device that converts one form of energy into another can be termed as a transducer. In electronic communication systems, we usually come across devices that have either their inputs or outputs in the electrical form. An electrical transducer may be defined as a device that converts some physical variable (pressure, displacement, force, temperature, etc) into corresponding variations in the electrical signal at its output.”