Question

Assertion : p-n junction diode can be used even at ultra high frequencies.
Reason : Capacitative reactance of a p-n junction diode increases as frequency increases.
A. if both the Assertion and Reason are true and the Reason is the correct explanation of Assertion.
B. if both the Assertion and Reason are true but the reason in not a correct explanation of the Assertion.
C. if the Assertion is true but the Reason is false.
D. if both Assertion and Reason are false.

Answer 1

Correct Answer - C
Here Assertion is correct but Reason is wrong. As capacitative reactance,
`X_(c)=1//(omegaC)=1//(2pi v C)`. It decreases as v increases.