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  4. Statement I A logic gate is a digital circuit. Statement II They are called gates, because they do not allow current through them.

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Q. Statement I A logic gate is a digital circuit.
Statement II They are called gates, because they do not allow current through them.

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

A gate is a digital circuit that follows certain logical relationship between the input and output voltages. Therefore, they are generally known as logic gates because they control the flow of information. The five common logic gates used are NOT, AND, OR, NAND and NOR.