Question

A gate in which all the inputs must be low to get a high output is called:
A) NAND gate
B) An Inverter
C) NOR gate
D) AND gate

Answer 1

Hint:
Recall the concept of logic gates. Logic gates are types of electronic circuits that have one or more than one input and have only one output. These gates are so connected in the circuit that have some logic. On the basis of that logic, they have their different names.

Step-by-Step Explanation
Step I:
A NAND gate is the logic gate made from AND-NOT gates. In NAND gates, if the inputs provided are high, then all the outputs obtained are low. If any of the input is low, then the output obtained will be high.
Step II:
An inverter is a logic gate. It is made up of logic NOT gates. Its main function is to invert the applied input signal. If the applied input is low, then the output will be high. If the input is high then the output will be low.
Step III:
The NOR gate is a logic gate obtained from NOT-OR gate. In NOR logic gates, the inputs given are low and the outputs are very high. It can be used to construct other basic gates.

Step IV:
The AND gate is also a type of logic gate. If all the inputs provided are very high, only then it will produce a high output.

Option C is the right answer.

Note:Though NAND and NOR gates look like they are the same, they have some differences in their properties. Both are known as universal gates. But NAND gate is preferred over NOR gate. This is because the area occupied by the NOR gate is larger and hence its capacitance is also large.