1
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The positive feedback is required by an amplifier to act an oscillator. The feedback here means :

A
External input is necessary to sustain ac signal in output.
B
A portion of the output power is returned back to the input.
C
Feedback can be achieved by LR network.
D
The base-collector junction must be forward biased.
2
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The I-V characteristics of a p-n junction diode in forward bias is shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltage of 2 V and 4 V respectively, is :

JEE Main 2022 (Online) 26th June Morning Shift Physics - Semiconductor Question 54 English

A
1 : 2
B
5 : 1
C
1 : 40
D
20 : 1
3
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify the logic operation performed by the given circuit:

JEE Main 2022 (Online) 25th June Evening Shift Physics - Semiconductor Question 53 English

A
AND gate
B
OR gate
C
NOR gate
D
NAND gate
4
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode because :

A
fractional change in majority carriers produce higher forward bias current
B
fractional change in majority carriers produce higher reverse bias current
C
fractional change in minority carriers produce higher forward bias current
D
fractional change in minority carriers produce higher reverse bias current
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