The figure shows a logic circuit with two inputs A and B and the… | NEET 2012 (AIPMT, Prelims)

Q167NEET 2012 · AIPMT · PRELIMSEasy

Logic Gates

The figure shows a logic circuit with two inputs A and B and the output C. The voltage wave forms across A, B and C are as given. The logic circuit gate is

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Answer: (a)

Read each interval: $0$ to $t_1$ : $A = 0, B = 0, C = 0$ .
$t_1$ to $t_2$ : $(1,0) \to 1$ ; $t_2$ to $t_3$ : $(1,1) \to 1$ ; $t_3$ to $t_4$ : $(0,1) \to 1$ .
$t_4$ to $t_5$ : $(0,0) \to 0$ ; $t_5$ to $t_6$ : $(1,0) \to 1$ .
$C = 0$ only when both inputs are 0, so $C = A + B$ .
So the answer is (a) OR gate.

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