WBCS.LIVE practice question

When a heavy body is lifted manually by a human hand, the forearm acts as which type of simple machine?

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

Answer options

  1. First-class lever
  2. Second-class lever
  3. Third-class lever
  4. Fixed pulley

Correct answer and explanation

Correct answer: Third-class lever

Explanation: āœ… Correct Answer: C) Third-class lever šŸ“š Explanation: The human forearm functions brilliantly as a third-class lever during the lifting of objects. In this biological system, the elbow joint acts as the fulcrum, the weight being lifted by the hand is the load, and the muscular effort is applied by the biceps exactly between the fulcrum and the load. This setup favors a greater range of motion over mechanical advantage.