engineering intelligence MCQ #976

You are given 8 balls, and one will be slightly heavier or lighter than the others. How can you find the heavier or lighter ball in only 2 weighings on a balance scale?

engineering intelligence MCQ #976

  1. Question 1

    Q1. You are given 8 balls, and one will be slightly heavier or lighter than the others. How can you find the heavier or lighter ball in only 2 weighings on a balance scale?

    • A) Weigh 3 against 3, then weigh 1 of the heavier or lighter group against another
    • B) Weigh 4 against 4, then weigh 2 of the heavier or lighter group against each other
    • C) Weigh 3 against 3, then if unbalanced, weigh 1 of the 3 against another. If balanced, weigh the remaining 2 against each other
    • D) Weigh all 8 together

    Answer: Weigh 3 against 3, then if unbalanced, weigh 1 of the 3 against another. If balanced, weigh the remaining 2 against each other

    Explanation: First weighing: 3 vs 3. If unbalanced, take the heavier/lighter 3 and weigh 1 vs 1. If still unbalanced, the heavier/lighter one is identified. If balanced, the remaining is the heavier/lighter one.