Mini Q Bank - Semiconductor Electronics 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

Q1:

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:

1.	$\mathrm{p}\text-$ type semiconductor
2.	insulator
3.	metal
4.	$\mathrm{n}\text-$ type semiconductor

Subtopic: Energy Band theory |

76%

From NCERT

AIPMT - 2007

1

2

3

4

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Q2:

Identify the incorrect statement from the following:

1.	The resistivity of a semiconductor increases with an increase in temperature.
2.	Substances with an energy gap of the order of $10~\text{eV}$ are insulators.
3.	In conductors, the valence and conduction bands may overlap.
4.	The conductivity of a semiconductor increases with an increase in temperature.

Subtopic: Energy Band theory |

81%

From NCERT

AIPMT - 2005

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2

3

4

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Q3:

Carbon, Silicon, and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy gaps represented by $\left(E_g\right)_C,(E_g)_{Si}~\text{and}~(E_g)_{Ge}$ respectively. Which one of the following relationships is true in their case?
1. $\left(E_g\right)_C<\left(E_g\right)_{G e}$
2. $\left(E_g\right)_C>\left(E_g\right)_{S i}$
3. $\left(E_g\right)_C=\left(E_g\right)_{S i}$
4. $\left(E_g\right)_C<\left(E_g\right)_{S i}$

Subtopic: Energy Band theory |

70%

From NCERT

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4

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Q4:

A

p - n

$\mathrm{p\text-n}$ photodiode is fabricated from a semiconductor with a band gap of

2.5 eV .

$2.5~\text{eV}.$ It can detect a signal of wavelength:
1.

6000 \overset{˚}{A}

$6000~\mathring{A}$
2.

4000 nm

$4000~\text{nm}$
3.

6000 nm

$6000~\text{nm}$
4.

4000 \overset{˚}{A}

$4000~\mathring{A}$

Subtopic: Energy Band theory |

64%

From NCERT

AIPMT - 2009

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2

3

4

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Q5:

A semiconductor is known to have an electron concentration of $8\times 10^{13}~\text{cm}^{-3},$ and a hole concentration of $5\times 10^{2}~\text{cm}^{-3}.$ The semiconductor is:

1.	$\mathrm{n}\text-$ type	2.	$\mathrm{p}\text-$ type
3.	intrinsic	4.	insulator

Subtopic: Types of Semiconductors |

88%

From NCERT

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Q6:

C

$\mathrm{C}$ and

S i

$\mathrm{Si}$ both have the same lattice structure, having

4

$4$ bonding electrons in each. However,

C

$\mathrm{C}$ is an insulator whereas

S i

$\mathrm{Si}$ is an intrinsic semiconductor. This is because:

1.	in the case of $\mathrm{C},$ the valence band is not completely filled at absolute zero temperature.
2.	in the case of $\mathrm{C},$ the conduction band is partly filled even at absolute zero temperature.
3.	the four bonding electrons in the case of $\mathrm{C}$ lie in the second orbit, whereas in the case of $\mathrm{Si},$ they lie in the third.
4.	the four bonding electrons in the case of $\mathrm{C}$ lie in the third orbit, whereas for $\mathrm{Si},$ they lie in the fourth orbit.

Subtopic: Energy Band theory |

72%

From NCERT

NEET - 2012

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Q7:

Pure

S i

$\mathrm{Si}$ at

500 K

$500~\text K$ has an equal number of electrons

(n_{i})

$(n_i)$ and the hole

(n_{h})

$(n_h)$ concentration of

1.5 \times 10^{16} m^{- 3} .

$1.5\times10^{16}~\text{m}^{-3}.$ Doping by indium increases the hole concentration

n_{h}

$n_h$ to

4.5 \times 10^{22} m^{- 3} .

$4.5\times 10^{22}~\text{m}^{-3}.$ The doped semiconductor is of:

1.	$\mathrm{n}\text-$ type with electron concentration $n_{e}=5\times10^{22}~\text{m}^{-3}$
2.	$\mathrm{p}\text-$ type with electron concentration $n_{e}=2.5\times10^{23}~\text{m}^{-3}$
3.	$\mathrm{n}\text-$ type with electron concentration $n_{e}=2.5\times10^{10}~\text{m}^{-3}$
4.	$\mathrm{p}\text-$ type with electron concentration $n_{e}=5\times10^{9}~\text{m}^{-3}$

Subtopic: Types of Semiconductors |

71%

From NCERT

NEET - 2011

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Q8:

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

Subtopic: PN junction |

85%

From NCERT

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Q9:

The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance $R_1$ will be:

1.	$2.5~\text A$	2.	$10.0~\text A$
3.	$1.43~\text A$	4.	$3.13~\text A$

Subtopic: PN junction |

88%

From NCERT

NEET - 2016

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Q10:

What is the reading of the ideal ammeters

A_{1}

$A_1$ and

A_{2}

$A_2$ connected in the given circuit diagram, if

p - n

$\mathrm{p\text-n}$ junction diodes are ideal?

1.	$2~\text A$ and zero	2.	$3~\text A$ and $2~\text A$
3.	$2~\text A$ and $3~\text A$	4.	Zero and $2~\text A$

Subtopic: PN junction |

84%

From NCERT

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