Q126 / 270 · NDA 2023 (Phase 1) · General Ability

Which one of the following is an example of Second Class Lever?

  • A
    A pair of scissors
  • Correct answer
    B
    A bottle opener
  • C
    A cricket bat
  • D
    A bow and arrow

Solution

Lever: A lever is a simple machine made up of a rigid rod arranged in such a manner that it can move freely around a fixed part. It consists of the following three parts. Fulcrum: This is the fixed point around which the rod moves. Load: It is the object or weight on which work is to be performed. Effort: It is the force that needs to be applied to the rod in order to perform a task. Based on the position of these three parts, the lever can be classified into three types. - First-class lever - Second-class lever - Third-class lever Explanation: First-class Iever: - The lever in which the fulcrum is located in between the load and the effort is called a first-class or class one lever. - Examples: a pair of scissors, a see-saw, and a crowbar. Second-class lever: - A Lever in which the load is located between the fulcrum and the effort is called a second-class or class two lever. - Examples: a wheelbarrow, a bottle opener, and a nutcracker. Third-class lever: - It is a Lever in which the effort is located in between the fulcrum and the load is called third-class or class three levers. - Examples: a pair of tongs, and a fishing rod. - Hence Fishing rod is the correct answer.

Hence, the correct answer is option: 'B'.

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