If the reverse bias in a junction diode is changed from \(5\) V to \(15\) V then the value of current changes from \(38\) \(\mu \text{A}\) to \(88\) \(\mu \text{A}.\) The resistance of junction diode will be:
1. \(4\times10^{5}\) 
2. \(3\times10^{5}\)
3. \(2\times10^{5}\)
4. \(10^{6}\)

Subtopic:  PN junction |
 84%
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The energy band diagrams for semiconductor samples of silicon are as shown. We can assert that:

          

1. sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectively.
2. sample X is undoped while both samples Y and Z have been doped with a fifth group impurity.
3. sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undoped.
4. sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively.
Subtopic:  Energy Band theory |
 67%
From NCERT
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In the circuit shown in the figure, the maximum output voltage Vo is:

     

1. 0 V

2. 5 V

3. 10 V

4. 52 V

Subtopic:  Rectifier |
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In the circuit given below, if V(t) is the sinusoidal voltage source, then the voltage drop VAB(t) across the resistance R:

1. is half-wave rectified.
2. is full-wave rectified.
3. has the same peak value in the positive and negative half-cycles.
4. has different peak values during the positive and negative half-cycles.
Subtopic:  Rectifier |
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A 2 V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is:

      

1. 0.2 A 2. 0.4 A
3. Zero 4. 0.1 A
Subtopic:  PN junction |
 83%
From NCERT
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For a diode connected in parallel with a resistor, Choose the correct graph between \((I)\) and \((V)\) for the given circuit:

             

1.   2.   
3.   4.  
Subtopic:  PN junction |
From NCERT
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A potential barrier of 0.50 V exists across a p-n junction. If the depletion region is 5.0×10-7 m wide, the intensity of the electric field in this region is:

1. \(1.0 \times 10^6 \mathrm{~V} / \mathrm{m}\) 2. \(1.0 \times 10^5 \mathrm{~V} / \mathrm{m}\)
3. \(2.0 \times 10^5 \mathrm{~V} / \mathrm{m}\) 4. \(2.0 \times 10^6 \mathrm{~V} / \mathrm{m}\)
Subtopic:  PN junction |
 82%
From NCERT
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p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength:
1. 6000 Å
2. 4000 nm
3. 6000 nm
4. 4000 Å
 
Subtopic:  Energy Band theory |
 62%
From NCERT
AIPMT - 2009
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\({C}\) and \({Si}\) both have the same lattice structure, having \(4\) bonding electrons in each. However, \(C\) is an insulator whereas \(Si\) is an intrinsic semiconductor. This is because:

1. in the case of \(C\), the valence band is not completely filled at absolute zero temperature.
2. in the case of \(C\), the conduction band is partly filled even at absolute zero temperature.
3. the four bonding electrons in the case of \(C\) lie in the second orbit, whereas in the case of \(Si\), they lie in the third.
4. the four bonding electrons in the case of \(C\) lie in the third orbit, whereas for \(Si\), they lie in the fourth orbit.
Subtopic:  Energy Band theory |
 71%
From NCERT
NEET - 2012
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The current through an ideal p-n junction diode shown in the circuit will be:

                     

1.  5 A

2.  0.2 A 

3.  0.6 A

4.  Zero

Subtopic:  PN junction |
 64%
From NCERT
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