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Question 8Asked in DSSSB TGT Computer Science (Technical), 12 Sep 2025, Shift 2 (1:00 PM)

Which of the following is INCORRECT, as per a 2-input OR gate truth table?

  1. AIf input A=1, B=0, then output Y=1.
  2. BIf input A=0, B=0, then output Y=1.
  3. CIf input A=1, B=1, then output Y=1.
  4. DIf input A=0 , B=1, then output Y=1.
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Correct answer: (B) If input A=0, B=0, then output Y=1.

Explanation

An OR gate gives 0 only when all inputs are 0. So A = 0, B = 0 gives Y = 0, and the statement Y = 1 is incorrect.

From DSSSB TGT Computer Science PYQ (Technical), 12 Sep 2025, Shift 2 (1:00 PM)

This is question 8 of DSSSB TGT Computer Science PYQ (Technical), 12 Sep 2025, Shift 2 (1:00 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.