A and B are inputs and C is the output. The voltage waveforms A, B and C are as shown. Choose the correct option for the LOGIC GATE.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → AND Gate
Read the logic levels (0 = low, 1 = high) of A, B and C between successive dashed lines of the figure, from left to right, and compare with the truth tables.
(A, B) = (0, 0) → C = 0
(A, B) = (1, 1) → C = 1
(A, B) = (0, 1) → C = 0
(A, B) = (1, 0) → C = 0
(A, B) = (0, 0) → C = 0
(A, B) = (1, 1) → C = 1
The output is high only when both inputs are high, which is the AND operation.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic was removed from the latest NCERT book (2026-27), and it also appears to be out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Logic Gates – “… An AND gate has two or more inputs and one output. The output Y of AND gate is 1 only when input A and input B are both 1. The logic symbol and truth table for this gate are given in Fig. 14.38”
