For which gate is the output high,if at least one input is low?

The output $Y$ of the combination of gates shown is equal to :-

To write the decimal number $37$ in binary, how many binary digits are required?

Identify the logic gate represented by the given circuit diagram:

Assertion: The logic gate $NOT$ can be built using a diode.
Reason: The output voltage and the input voltage of the diode have a $180^o$ phase difference.

How many $NAND$ gates are used to form an $AND$ gate?