The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that (a) Sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectively
(b) Sample X is undoped while both samples Y and Z have been doped with a fifth group impurity
(c) Sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undoped
(d) Sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively

Concept Questions :-

Energy band theory
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Difficulty Level:

In a semiconducting material, the mobilities of electrons and holes are ${\mathrm{\mu }}_{\mathrm{e}}$ and ${\mathrm{\mu }}_{\mathrm{h}}$ respectively. Which of the following is true?
(a) ${\mathrm{\mu }}_{\mathrm{e}}$>${\mathrm{\mu }}_{\mathrm{h}}$               (b)  ${\mathrm{\mu }}_{\mathrm{e}}$<${\mathrm{\mu }}_{\mathrm{h}}$
(c)  ${\mathrm{\mu }}_{\mathrm{e}}$${\mathrm{\mu }}_{\mathrm{h}}$             (d)  ${\mathrm{\mu }}_{\mathrm{e}}$<0; ${\mathrm{\mu }}_{\mathrm{h}}$>0

Concept Questions :-

Types of semiconductors
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Difficulty Level:

The temperature (T) dependence of resistivity ($\rho$) of a semiconductor is represented by Concept Questions :-

Types of semiconductors
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Difficulty Level:

In a forward biased PN-junction diode, the potential barrier in the depletion region is of the form Concept Questions :-

PN junction
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Difficulty Level:

Different voltages are applied across a P-N junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current Concept Questions :-

PN junction
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Difficulty Level:

If the following input signal is sent through a PN-junction diode, then the output signal across ${\mathrm{R}}_{\mathrm{L}}$ will be Concept Questions :-

PN junction
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Difficulty Level:

The curve between charge density and distance near P-N junction will be Concept Questions :-

PN junction
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Difficulty Level:

The resistance of a germanium junction diode whose is shown in figure is $\left({\mathrm{V}}_{\mathrm{k}}=0.3\mathrm{V}\right)$ (a) 5 k$\mathrm{\Omega }$
(b) 0.2 k$\mathrm{\Omega }$
(c) 2.3 k$\mathrm{\Omega }$
(d) $\left(\frac{10}{2.3}\right)\mathrm{k\Omega }$

Concept Questions :-

PN junction
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Difficulty Level:

In the half-wave rectifier circuit shown. Which one of the following wave forms is true for ${\mathrm{V}}_{\mathrm{CD}}$, the output across C and D? Concept Questions :-

Rectifier
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Difficulty Level:

A full-wave rectifier circuit along with the input and output voltages is shown in the figure. The contribution to the output voltage from diode – 2 is :

(a) A, C                       (b) B, D
(c) B, C                       (d) A, D

Concept Questions :-

Rectifier