AP EAPCET 06-Jul-2022 Shift 2 Paper

Truth table for AND, OR, NAND and NOR gate for two input A and B are given below.
AND gate

A	B	Output Y=AB
0	0	0
0	1	0
1	0	0
1	1	1

OR gate  

A	B	Output Y=AB
0	0	0
0	1	1
1	0	1
1	1	1

NOR gate 

A	B	A+B	Output Y= − A + − B
0	0	0	1
0	1	1	0
1	0	1	0
1	1	0	0

NAND gate 

A	B	A+B	Output Y= − AB
0	0	0	1
0	1	0	1
1	0	0	1
1	1	1	0

From above truth tables, it is clear that in NOR and NAND gate, if all the inputs are low, then their outputs are high.