Voltage Comparator.

Based on the value of input and reference voltages a comparator can be named as
If the input of the comparator is sine wave, then the output is _______.
Clamp diodes used in comparators ______.
If an op-amp comparator has a gain of 100,000, an input difference of 0.2 mV above reference, and a supply of 12 V, the output will be?
How to obtain high rate of accuracy in comparator?