Semiconductors Question 1
Question 1 - 24 January - Shift 1
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Photodiodes are preferably operated in reverse bias condition for light intensity measurement.
Reason $\mathbf{R}$ : The current in the forward bias is more than the current in the reverse bias for a $p-n$ junction diode.
In the light of the above statement, choose the correct answer from the options given below :
(1) $\mathbf{A}$ is false but $\mathbf{R}$ is true
(2) Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$
(3) $\mathbf{A}$ is true but $\mathbf{R}$ is false
(4) Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$
Show Answer
Answer: (2)
Solution:
Photodiodes are operated in reverse bias as fractional change in current due to light is more easy to detect in reverse bias.
