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Physics · 2025 · 2 marks
Semiconductor Electronics: Materials, Devices and Simple CircuitsSemiconductor Diode2 marksApplyvery short answer
CBSE 2025 · Region 2 · Set 1 · Q21
The threshold voltage of a silicon diode is 0.7 V. It is operated at this point by connecting the diode in series with a battery of V volt and a…
The threshold voltage of a silicon diode is $\displaystyle 0.7$ V. It is operated at this point by connecting the diode in series with a battery of V volt and a resistor of $\displaystyle 1000 \Omega$. Find the value of V when the current drawn is $\displaystyle 15$ mA.
Marking-scheme solution
$\displaystyle V-V_{0}=I R$
$\displaystyle V-0.7=\left(15 \times 10^{-3}\right) \times 1000$
$\displaystyle V=15.7$ volt
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CBSE Class 12 Physics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.