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Question 20Asked in DSSSB TGT Computer Science (Technical), 13 Sep 2025, Shift 3 (5:00 PM)

What is the Boolean expression for a 2-input NOR gate?

  1. AA·B
  2. B(A·B)' (complement of A·B)
  3. C(A + B)' (complement of A + B)
  4. DA + B
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Correct answer: (C) (A + B)' (complement of A + B)

Explanation

NOR is the complement of OR: Y = (A + B)'. The output is 1 only when both inputs are 0.

From DSSSB TGT Computer Science PYQ (Technical), 13 Sep 2025, Shift 3 (5:00 PM)

This is question 20 of DSSSB TGT Computer Science PYQ (Technical), 13 Sep 2025, Shift 3 (5:00 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.