WBCS.LIVE practice question

A bird is sitting in a wire cage hanging from the spring balance. Let the reading of the spring balance be W₁. If the bird flies about inside the cage, the reading of the spring balance becomes W2. Which of the following is true?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. W1 > W2
  2. W1 < W2
  3. W1 = W2
  4. W1=1W2

Correct answer and explanation

Correct answer: W1 = W2

Explanation: ✅ Correct Answer: C) W1 = W2 📚 Explanation: According to the principles of physics, a bird flying inside a closed cage exerts a downward force on the air to stay up. This force is transferred exactly to the bottom of the cage. Therefore, the total weight recorded by the balance remains the same whether the bird is sitting or flying. This assumes the cage is a single, perfectly balanced system.