PN junction JEE-Mains MCQs Semiconductor Electronics Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

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Semiconductor Electronics
JEE-Mains MCQs
PN junction (20 Qs)

1(current)
2

Q. No.

The forward-biased diode connection is:

1.		2.
3.		4.

Q1:

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In an unbiased p-n junction electrons diffuse from the n-region to the p-region because:

1.	electrons travel across the junction due to potential difference
2.	electron concentration in the n-region is more as compared to that in the p-region
3.	only electrons move from the n to p region and not the vice-versa.
4.	holes in the p-region attract them

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The \(V\text-I\) characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is:

1. \(10\)
2. \(10^{-6}\)
3. \(100\)
4. \(10^6\)

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The ammeter reading for the silicon diode in the given circuit is:

1.	\(0\)	2.	\(15~\text{mA}\)
3.	\(11.5~\text{mA}\)	4.	\(13.5~\text{mA}\)

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A diode with a forward bias voltage drop of \(0.5~\text{V}\) has a maximum safe current rating of \(10~\text{mA}.\) Suppose this diode is connected in series with a resistor to a battery of EMF \(1.5~\text{V}.\)What minimum resistance value is required to ensure the current does not exceed the diode's safe operating limit?
1. \(300~\Omega \)
2. \(50~\Omega \)
3. \(100~\Omega \)
4. \(200~\Omega\)

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In connection with the circuit drawn below, the value of the current flowing through \(2~\text{k}\Omega\) resistor is:

1. \(5 \times 10^{-4} ~\text A\)
2. \(5 \times 10^{-3} ~\text A\)
3. \(25 \times 10^{-4} ~\text A\)
4. \(25 \times 10^{-3}~\text A\)

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The circuit contains two diodes each with a forward resistance of \(50 ~\Omega\) and with infinite reverse resistance. If the battery voltage is \(6~\text V,\) the current through the \(120 ~\Omega\) resistance is:

1. \(10~\text{mA}\)
2. \(20~\text{mA}\)
3. \(30~\text{mA}\)
4. \(40~\text{mA}\)

Q7:

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The \((\text{I-V})\) characteristics of a \(\text{p-n}\) junction diode in forward bias are shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltages of \(2\) V and \(4\) V respectively, is: