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NEET UG PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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Two amplifiers are connected one after other in series. The first amplifier has voltage gain of 15 and second has voltage gain of 20. If input signal voltage is 0.3 V, the output signal voltage is

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Correct option: C

90 V

Option D (9V) is correct because the total voltage gain is the product of the individual gains, and the output voltage is the input voltage multiplied by the total gain.

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Following is the relation between current and charge

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

, then value of

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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 =

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

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