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  9. Q72

UKPSC PCS 2025 · Question 72 of 150

What is the Boolean expression for a NAND gate?

Science & Tech

  1. AA + B
  2. BNOT (A AND B)Correct
  3. CNOT (A OR B)
  4. DA AND B

Answer: B. NOT (A AND B)

Explanation

A NAND gate outputs the negation of AND, i.e., NOT (A AND B).

Source: UKPSC Combined Upper PCS Prelims 2025 GS (Paper-I) held 29-Jun-2025, Series-A (SDJ), via teachingninja.in; answers from UKPSC provisional answer key Series A (prepp.in)

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