Question

Assertion: The logic gate `NOT` can be built using diode.
Reason: The output voltage and the input voltage of the diode have `180^(@)` phase difference.
A. If both the assertion and reason are true and reason is a true explantion of the assertion.
B. If both the assertion and reason are true but the reason is not true the correct explantion of the assertion.
C. If the assertion is true but reason false
D. If both the assertion and reason are false.

Answer 1

Correct Answer - D
The `NOT` gate has only one input and one output. It combines the input `A` with the output `Y`, from Boolean expression
`bar(A)=Y`
We cannot realise a `NOT` gate by using diodes.

Instead a transistor has to be used. An electric circuit and truth table for a `NOT` gate using a `n-p-n` transistor is shown.