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NEET UG PHYSICS MCQ: SEMI CONDUCTOR DEVICES

1 Hard

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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 for a silicon p-n junction is typically around 0.7V, not between 2V and 5V.

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Following is the relation between current and charge

I = A{T^2}{e^{q/{V_L}}}

, then value of

{V_L}

will be To measure light intensity we use The ratio of RMS output voltage of full wave rectifier and half wave rectifier is

\sqrt{n}.

n

is? (The input voltage is sine wave). The truth table shown in figure is for
A    0   0   1   1
B    0   1   0   1
Y    1   0   0   1  The average value of output direct current in a half wave rectifier is A

p - n\;

junction has acceptor impurity concentration of

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

P

side and donor impurity concentration of

{10^{16}}

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

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}}