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Friday, 9 October

NEET UG 2018 · Physics · Question 17

NEET 2018 Physics, question 17

Question 17 of the NEET 2018 paper (code AA) is a Physics question from Semiconductor Electronics: Materials, Devices and Simple Circuits. Its idea, XOR Gate Fundamentals, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 2.

Updated 2026-10-08

Q17 · Physics

In the combination of the following gates the output Y can be written in terms of inputs A and B as

The figure, described in words

Logic circuit: AND gate 1 inputs A and NOT B; AND gate 2 inputs NOT A and B; both AND outputs feed an OR gate giving Y.

  1. 1A⋅B‾+A⋅B\overline{A\cdot B} + A\cdot B
  2. 2A⋅Bˉ+Aˉ⋅BA\cdot\bar{B} + \bar{A}\cdot BOfficial answer
  3. 3A⋅B‾\overline{A\cdot B}
  4. 4A+B‾\overline{A + B}

Official answer: option 2 · CBSE official answer key

Same idea

The only question on XOR Gate Fundamentals

No other NEET paper from 2017–2026 tested this exact idea.

XOR Gate Fundamentals: every question and how it was framed

The chapter

Semiconductor Electronics: Materials, Devices and Simple Circuits in ten years of NEET

27 questions from 2017–2026, asked in 10 of 10 papers, about 2.6 a paper. Logic Gates alone had 10.

Chapter analysisStudy this chapterPractise this chapter

Semiconductor Electronics: Materials, Devices and Simple Circuits: questions per paper

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