In the circuit, the logical value of A = 1 or B = 1 when potential at A or B is 5V and the logical value of A = 0 or B = 0 when potential at A or B is 0 V.
The truth table of the given circuit will be :

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A	B	Y
0	0	1
1	0	1
0	1	1
1	1	0

A	B	Y
0	0	0
1	0	1
0	1	1
1	1	1

A	B	Y
0	0	0
1	0	0
0	1	0
1	1	1

A	B	Y
0	0	0
1	0	0
0	1	0
1	1	0

answer is A.

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Detailed Solution

When both A and B have logical value ‘1’ both diode are reverse bias and current will flow in resistor hence output will be 5 volt i.e. logical value ‘1’.

In all other case conduction will take place, hence output will be zero volt i.e. logical value ‘0’.

So truth table is

A	B	Y
0	0	0
0	1	0
1	0	0
1	1	1

(AND gate)

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