Which of the following gate is called the universal gate? 
1. \(\mathrm{OR}\) gate 
2. \(\mathrm{AND}\) gate 
3. \(\mathrm{NAND}\) gate 
4. \(\mathrm{NOT}\) gate 

An intrinsic semiconductor is converted into an \(\mathrm{n\text{-}}\)type extrinsic semiconductor by doping it with: 

Out of the following which one is a forward-biased diode?

1.
2.
3.
4.

The electron concentration in an \(\mathrm{n\text-}\)type semiconductor is the same as the hole concentration in a \(\mathrm{p\text{-}}\)type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

Consider the following statements (A). and (B). and identify the correct answer. 

For the given circuit, the input digital signals are applied at the terminals \(A\), \(B\) and \(C\). What would be the output at terminal \(Y\)?
 

1.
2.
3.
4.

The solids which have the negative temperature coefficient of resistance are:

The increase in the width of the depletion region in a \(\mathrm{p\text{-}n}\) junction diode is due to:

For the logic circuit shown, the truth table is: