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GATE 2026 ST – Question 5

General Aptitude · Analytical Aptitude: Logical Reasoning, Deduction and Analogy · 1 mark · Multiple choice

“When the teacher is in the room, all students stand silently.” If true, which is not necessarily true?

  1. If any student is not standing silently, the teacher is absent.
  2. When the teacher is present, all students are silent.
  3. If all students are standing, the teacher is present.
  4. When the teacher is present, all students are standing.

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Show answer and explanation

Correct answer: (C) If all students are standing, the teacher is present.

Explanation

A is the contrapositive. B and D are individual parts of “stand silently.” C reverses the implication: students could stand even without the teacher. **C**.

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