Zener diode is used as:
1. Half-wave rectifier
2. Full-wave rectifier
3. AC voltage stabilizer
4. DC voltage stabilizer

Subtopic:  Applications of PN junction |
From NCERT
AIPMT - 1999
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The depletion layer has (for an unbiased \(\mathrm{p\text-n}\) junction):
1. electrons
2. holes
3. static ions
4. neutral atoms

Subtopic:  PN junction |
 64%
From NCERT
AIPMT - 1999
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In semiconductors at room temperature:

1. The valence band is completely filled and the conduction band is partially filled.
2. The valence band is completely filled.
3. The conduction band is completely empty.
4. The valence band is partially empty and the conduction band is partially filled.
Subtopic:  Energy Band theory |
 70%
From NCERT
AIPMT - 2004
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The peak voltage in the output of a half-wave diode rectifier fed with a sinusoidal signal without a filter is \(10\) V. The DC component of the output voltage is:
1. \(\frac{10}{\pi }\) V
2. \(10\) V
3. \(\frac{20}{\pi }\) V
4. \(\frac{10}{\sqrt{2}}\) V

Subtopic:  Rectifier |
 51%
From NCERT
AIPMT - 2004
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In a p–n junction photocell, the value of the photo electromotive force produced by monochromatic light is proportional to:

1. the intensity of the light falling on the cell.
2. the frequency of the light falling on the cell.
3. the voltage applied at the p–n junction.
4. the barrier voltage at the p–n junction.

Subtopic:  PN junction |
 60%
From NCERT
AIPMT - 2004
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The output of the OR gate is \(1\):

1. if either or both inputs are \(1.\)
2. only if both inputs are \(1.\)
3. if either input is zero
4. if both inputs are zero

Subtopic:  Logic gates |
 89%
From NCERT
AIPMT - 2004
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What is the correct statement regarding a \(\mathrm{p\text-n}\) junction:
1. High potential at the \(\mathrm{n}\) side and low potential at the \(\mathrm{p}\) side.
2. High potential at the \(\mathrm{p}\) side and low potential at the \(\mathrm{n}\) side.
3. \(\mathrm{p}\) and \(\mathrm{n}\) both are at the same potential.
4. Undetermined.
Subtopic:  PN junction |
From NCERT
AIPMT - 2002
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The given truth table is for which logic gate: 
A B Y
\(1\) \(1\) \(0\)
\(0\) \(1\) \(1\)
\(1\) \(0\) \(1\)
\(0\) \(0\) \(1\)
1. NAND
2. XOR
3. NOR
4. OR

Subtopic:  Logic gates |
 86%
From NCERT
AIPMT - 2002
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For the given circuit of the \(\mathrm{p\text-n}\) junction diode, which of the following statements is correct?

        

1. In F.B. the voltage across \(R\) is \(V\).
2. In R.B. the voltage across \(R\) is \(V\).
3. In F.B. the voltage across \(R\) is \(2V\).
4. In R.B. the voltage across \(R\) is \(2V\).

Subtopic:  PN junction |
 79%
From NCERT
AIPMT - 2002
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The following truth table represent which logic gate:

A B C
1 1 0
0 1 1
1 0 1
0 0 1


1.  XOR
2.  NOT
3.  NAND
4.  AND

Subtopic:  Logic gates |
 91%
From NCERT
AIPMT - 2001
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