1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The zener voltage in the circuit shown is $\mathrm{V}_{\mathrm{Z}}=20 \mathrm{~V}$. The load resistance $\mathrm{R}_{\mathrm{L}}=5 \mathrm{k} \Omega$ and the resistance $\mathrm{R}_{\mathrm{S}}=10 \mathrm{k} \Omega$. If the input voltage is $\mathrm{V} \mathrm{s}=100 \mathrm{~V}$, then the current through the zener diode in milliampere is:

COMEDK 2025 Evening Shift Physics - Semiconductor Devices and Logic Gates Question 1 English

A
8
B
6
C
4
D
5
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
What is the dc component of the output voltage if a sinusoidal signal of 33 V peak voltage is the input of a half wave diode rectifier circuit?
A
3.5 V
B
2.9 V
C
10.5 V
D
12.5 V
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
An intrinsic semiconductor has equal concentrations of hole and electron which is equal to $4 \times 10^8 \mathrm{~m}^{-3}$. During its conversion to extrinsic semiconductor, concentration of hole increases to $8 \times 10^{10} \mathrm{~m}^{-3}$. The new electron concentration is:
A
$4 \times 10^8 \mathrm{~m}^{-3}$
B
$2 \times 10^8 \mathrm{~m}^{-3}$
C
$2 \times 10^6 \mathrm{~m}^{-3}$
D
$4 \times 10^{10} \mathrm{~m}^{-3}$
4
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

COMEDK 2025 Afternoon Shift Physics - Semiconductor Devices and Logic Gates Question 4 English

Three ideal diodes and resistors connected to the cell of negligible internal resistance is as shown. Find the current passing through the $10 \Omega$ resistor.

A
1 A
B
2 A
C
0.5 A
D
0.1 A
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