Match List-I with List-II
| List-I | List-II |
| Electronic Device | Function |
| (A) Stabilizer | (I) Used to convert a.c. voltage into d.c. voltage |
| (B) Filter | (II) Used either for stepping up or stepping down the a.c. voltage |
| (C) Rectifier | (III) Used for constant output voltage even when the input voltage or load current changes |
| (D) Transformer | (IV) Used to remove any ripple in the rectified output voltage |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) - (III), (B) - (IV), (C) - (I), (D) - (II)
These four devices are the stages of a d.c. power supply: the transformer sets the a.c. voltage level, the rectifier turns it into pulsating d.c., the filter smooths it and the stabilizer holds the output steady.
(A) Stabilizer — this matches (III) Used for constant output voltage even when the input voltage or load current changes. A stabilizer (for example a Zener diode regulator) keeps the output voltage fixed.
(B) Filter — this matches (IV) Used to remove any ripple in the rectified output voltage. A capacitor or inductor filter removes the a.c. ripple left after rectification.
(C) Rectifier — this matches (I) Used to convert a.c. voltage into d.c. voltage. A diode conducts in one direction only, so it turns a.c. into one-way (d.c.) current.
(D) Transformer — this matches (II) Used either for stepping up or stepping down the a.c. voltage. The output voltage depends on the turns ratio \( N_s/N_p \).
NCERT (2026-27):
Application of Junction Diode as a Rectifier – “… This property is used to rectify alternating voltages and the circuit used for this purpose is called a rectifier.”
Application of Junction Diode as a Rectifier – “… Since these additional circuits appear to filter out the ac ripple and give a pure dc voltage, so they are called filters.”
Transformers – “… That is, if the secondary coil has a greater number of turns than the primary (Ns > Np), the voltage is stepped up (Vs > Vp). … If the secondary coil has less turns than the primary (Ns < Np), we have a step-down transformer.”