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Physics · 2026 · 3 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsApplication of Junction Diode as a Rectifier3 marksApplyshort answer
CBSE 2026 · Region 4 · Set 1 · Q28
With the help of a circuit diagram, explain the working of a full wave rectifier. Depict the input and output waveforms.
With the help of a circuit diagram, explain the working of a full wave rectifier. Depict the input and output waveforms.
Marking-scheme solution
Explaining the working with the help of circuit diagram
Depicting the input and output waveforms
\[1 / 2+1 / 2
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Let the input voltage A with respect to the centre tap at any instant is positive. At that instant, voltage at B being out of phase will be negative. So, diode $\displaystyle \mathrm{D}_{1}$ gets forward biased and conducts (while $\displaystyle \mathrm{D}_{2}$ being reverse biased is not conducting). Hence, during this positive half cycle we get an output current. When voltage at A becomes negative w.r.t. centre tap, the voltage at B would be positive. In this part of the cycle diode $\displaystyle \mathrm{D}_{1}$ would not conduct but diode $\displaystyle \mathrm{D}_{2}$ would be giving output current.
Let the input voltage A with respect to the centre tap at any instant is positive. At that instant, voltage at B being out of phase will be negative. So, diode $\displaystyle \mathrm{D}_{1}$ gets forward biased and conducts (while $\displaystyle \mathrm{D}_{2}$ being reverse biased is not conducting). Hence, during this positive half cycle we get an output current. When voltage at A becomes negative w.r.t. centre tap, the voltage at B would be positive. In this part of the cycle diode $\displaystyle \mathrm{D}_{1}$ would not conduct but diode $\displaystyle \mathrm{D}_{2}$ would be giving output current.All Semiconductor Electronics: Materials, Devices and Simple Circuits questions2026 question paperNCERT solutions: Semiconductor Electronics: Materials, Devices and Simple CircuitsPractice Semiconductor Electronics: Materials, Devices and Simple Circuits →
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.