A $p - n\;$ junction has acceptor impurity concentration of ${10^{17}}{\rm{c}}{{\rm{m}}^{ - 3}}$ in the $P$ side and donor impurity concentration of ${10^{16}}$ ${\rm{c}}{{\rm{m}}^{ - 3}}$ in the $N$ side. What is the contact potential at the junction? ($kT = $ thermal energy, intrinsic carrier concentration ${n_i} = 1.4 \times {10^{10}}$ ${\rm{c}}{{\rm{m}}^{ - 3}}$ )

$\left( {\frac{{kT}}{e}} \right)$ ln ($2.5 \times {10^{23}}$)

$\left( {\frac{{kT}}{e}} \right)$ ln (${10^{23}}$)

$\left( {\frac{{kT}}{e}} \right)$ ln (${10^9}$)

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JEE • PHYSICS • SEMI CONDUCTOR DEVICES

Semi conductor devices practice · Hard

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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1 Hard

1 of 5

Remembering +4 | -1

The emission of electrons from the host atoms due
to the high electric field is known as

View answer and explanation

Correct option: B

internal field emission

Option B (internal field emission) is correct because it describes the process of electron emission from host atoms due to a strong electric field.

2 Hard

2 of 5

Application +4 | -1

p - n\;

junction has acceptor impurity concentration of

{10^{17}}\mathrm{c}{\mathrm{m}^{ - 3}}

in the

P

side and donor impurity concentration of

{10^{16}}

\mathrm{c}{\mathrm{m}^{ - 3}}

in the

N

side. What is the contact potential at the junction? (

kT =

thermal energy, intrinsic carrier concentration

{n_i} = 1.4 \times {10^{10}}

\mathrm{c}{\mathrm{m}^{ - 3}}

)

View answer and explanation

Correct option: A

\left( {\frac{{kT}}{e}} \right)

ln (

4 \times {10^{12}}

)

Option A (

\left( {\frac{{kT}}{e}} \right)

ln (

4 \times {10^{12}}

)) is correct because it is calculated using the formula for contact potential, considering the acceptor and donor concentrations and intrinsic carrier concentration.

3 Hard

3 of 5

Understanding +4 | -1

Given below are three statements.

A. At absolute zero, Si acts as a perfect insulator.

B. When p-n junction diode is forward biased, both the thickness of depletion region and the barrier height are increased.

C. Order of energy band gap of C, Si and Ge is

(\mathrm{E})_{\mathrm{C}}>(\mathrm{E})_{\mathrm{Si}}>(\mathrm{E})_{\mathrm{Ge}}.

Choose the correct answer from the options given below.

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Correct option: D

Only A & C are correct

Option D is correct because at absolute zero, silicon acts as a perfect insulator, and the order of energy band gap is correctly given as (E)C > (E)Si > (E)Ge.

4 Hard

4 of 5

Understanding +4 | -1

Consider the following statements I and II and
identify the correct answer from the given options.

Statement-I: A zener diode should be connected
in reverse bias for proper functioning.

Statement-II: The potential barrier of a silicon
p-n junction lies between 2 V and 5 V.

Choose the correct answer from the options given
below.

View answer and explanation

Correct option: C

Statement-I is true but Statement-II is false

Option C is correct because a Zener diode operates in reverse bias, and the potential barrier of a silicon p-n junction is typically around 0.7V, not between 2V and 5V.

5 Hard

5 of 5

Understanding +4 | -1

Consider the following statements

(i) An intrinsic semiconductor will behave as insulator at T = 0 K

(ii) Doping pure silicon with trivalent impurities gives p-type semiconductors

(iii) The majority carriers in n-type semiconductors are electrons

(iv) Solar cell works when it is in forward bias

The correct statements(s) is/are

View answer and explanation

Correct option: C

Only (i), (ii) and (iii)

Option C (Only (i), (ii) and (iii)) is correct because intrinsic semiconductors act as insulators at 0K, doping silicon with trivalent impurities creates p-type semiconductors, and electrons are the majority carriers in n-type semiconductors.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 5 single-correct-answer MCQs on SEMI CONDUCTOR DEVICES.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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