Verification and interpretation of truth table for AND, OR, NOT, NAND, NOR, Ex-OR, Ex-NOR gates.

Electronic circuits that operate on one or more input signals to produce standard output ___________
A __________ gate gives the output as 1 only if all the inputs signals are 1.
The boolean expression of an OR gate is _______
The gate which is used to reverse the output obtained is _____
Which of the following gate will returns a 1 only if both the inputs are 0?