Logic Gates MSQ - Physics MCQ

In digital electronics, a NAND gate (NOT-AND) is a logic gate which produces an output which is false only if all its inputs are true; thus its output is complement to that of an AND gate. A LOW (0) output results only if all the inputs to the gate are HIGH (1); if any input is LOW (0), a HIGH (1) output results.

 Answer :- d

Solution :- A transistor can be used as a switch. That is, when base is low collector is high (input zero, output one) and base is high collector is low (input 1, output 0).

The correct answer is: X = ​

The correct answer is: all 4

The Truth table for NAND gate is given below

The Truth table for XNOR gate is given below

The Truth table for NOR gate is given below

It is clear from the tables that when all the inputs are zero the output is high for NAND, XNOR and NOR. Hence correct answers are a, c and d.

The correct answer is: x + yz

The correct answers are: OR, AND, NOT

An OR gate gives the result as 1 if any one of the inputs is one. 
Its expression is A + B. 
An OR gate gives a 0 only if both the inputs are 0.

The correct answers are: 

The correct answers are: The boolean expression of an AND gate followed by an inverter is same as the boolean expression for a NAND gate., The boolean expression for an OR gate followed by a NOT gate is same as that for a NOR gate, No two basic logic gates have the same boolean expression