GATE CE 2023 Set 1 — Question 4

MCQ+1 / -0.33MediumDeduction & InductionAnalytical AptitudeGeneral Aptitude

General Aptitude → Analytical Aptitude → Deduction & Induction

Last updated 5 September 2026

Question

A duck named Donald Duck says “All ducks always lie.” Based only on the information above, which one of the following statements can be logically inferred with certainty ?

Correct answer (D) Donald Duck’s statement is false. Solution If the statement "All ducks always lie" were true, then Donald Duck (being a duck) would be lying, which is a contradiction. Therefore, the statement must be false. If the statement is false, it means not all ducks always lie. This doesn't mean Donald Duck always lies or always tells the truth; it just means the specific statement he made is false. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (D) Donald Duck’s statement is false. Solution If the statement "All ducks always lie" were true, then Donald Duck (being a duck) would be lying, which is a contradiction. Therefore, the statement must be false. If the statement is false, it means not all ducks always lie. This doesn't mean Donald Duck always lies or always tells the truth; it just means the specific statement he made is false.

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