The correct symbol for zener diode is:

1. 2.
3. 4.
Subtopic:  Applications of PN junction |
 90%
From NCERT
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Which of the following graphs may correctly represent the variation of current \((I)\) with potential difference \((V)\) across a zener diode?
1. 2.
3. 4.
Subtopic:  Applications of PN junction |
 88%
From NCERT
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An LED is constructed from a \(\mathrm{p\text{-}n}\) junction diode using \(\mathrm{GaAsP}\). The energy gap is \(1.9~\text{eV}\). The wavelength of the light emitted will be equal to:
1. \(10.4 \times 10^{-26} \text{m}\)
2. \(654~ \text{nm}\)
3. \(654~ \text{m}\)
4. \(654\times 10^{-11}~\text{m}\)

Subtopic:  Applications of PN junction |
 79%
From NCERT
NEET - 2019
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Zener breakdown will occur if:
1. impurity level is low.
2. impurity level is high.
3. impurity is less on the \(\mathrm{n\text-}\)side.
4. impurity is less on the \(\mathrm{p\text-}\)side.

Subtopic:  Applications of PN junction |
 75%
From NCERT
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In the given circuit, the power developed in \(2~\text{k}\Omega\) resistor is:


1. \(36~\text{mW}\)
2. \(12~\text{mW}\)
3. \(144~\text{mW}\)
4. \(72~\text{mW}\)

Subtopic:  Applications of PN junction |
 72%
From NCERT
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The LED:
1. is reverse-biased.
2. is forward-biased.
3. can be made of \(\mathrm{GaAs}\).
4. both (2) & (3) are correct.

Subtopic:  Applications of PN junction |
 70%
From NCERT
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A Zener diode is used to obtain a constant voltage. If applied voltage \(\text V\) changes, then:
(\(\text V\) is more than Zener voltage)
             

1. \(i_{1}\) and \(i_{2}\) change.
2. \(i_{2}\) and \(\text V_{0}\) change and \(i_{3}\) remains constant.
3. \(i_{2}\) and \(\text V_{0}\) don't change while \(i_{3}\) changes.
4. \(i_{3}\) and \(\text V_{0}\) don't change while \(i_{2}\) changes.
Subtopic:  Applications of PN junction |
 65%
From NCERT
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The given graph represents the \(V\text-I\) characteristic for a semiconductor device. Which of the following statement is correct?

1. It is a \(V\text-I\) characteristic for a solar cell where point \(A\) represents open-circuit voltage and point \(B\) represents short-circuit current.
2. It is for a solar cell and points \(A\) and \(B\) represent open-circuit voltage and current respectively.
3. It is for a photodiode and points \(A\) and \(B\) represent open-circuit voltage and current respectively.
4. It is for a LED and points \(A\) and \(B\) represent open-circuit voltage and short circuit current respectively.
Subtopic:  Applications of PN junction |
 68%
From NCERT
NEET - 2014
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A Zener diode is shown in the following circuit diagram. When the source voltage fluctuates such that \(V>V_z\) then:
   

1. all the current \(I_1, I_2~\text{and}~I_3\) change.
2. only \(I_1\) and \(I_2\) change and \(I_3\) remains constant.
3. only \(I_1\) and \(I_3\) change and \(I_2\) remains constant.
4. all the currents remain constant.
Subtopic:  Applications of PN junction |
 69%
From NCERT
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