engineering intelligence MCQ #961

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

engineering intelligence MCQ #961

  1. Question 1

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

    • A) Divide into 3, 3, and 2, then weigh the 3s
    • B) Divide into 4 and 4, then weigh
    • C) Weigh 3 against 3, then weigh the remaining 2
    • D) Weigh 1 against 1 until you find the different one

    Answer: Divide into 3, 3, and 2, then weigh the 3s

    Explanation: Divide the balls into 3, 3, and 2. Weigh the two groups of 3. If they balance, the different ball is in the group of 2. Weigh one of the 2 against a known good ball.