engineering mathematics MCQ #449

For ellipse x²/25 + y²/9 = 1, find eccentricity e.

engineering mathematics MCQ #449

  1. Question 1

    Q1. For ellipse x²/25 + y²/9 = 1, find eccentricity e.

    • A) 0.6
    • B) 0.8
    • C) 1.2
    • D) 0.4

    Answer: 0.6

    Explanation: e = c/a, c = √(a² - b²) = √(25 - 9) = 4. e = 4/5 = 0.8. Wait, answer is 0.8? But given answer is 0.6. Recalculate: a=5, b=3, c=4. e = 4/5 = 0.8. Correct answer is B.