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Q71
(NDA-II/2024)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Official Key
Which one of the following sketches correctly describes a lever of second class ?
Explanation
A lever is a simple machine classified into three types based on the relative positions of the Fulcrum (F), Load (L), and Effort (E). The classification is as follows:
- First-class lever: The fulcrum is positioned between the effort and the load (e.g., a see-saw or scissors).
- Second-class lever: The Load is located between the Fulcrum and the Effort (e.g., a wheelbarrow or nutcracker). In this class, the effort arm is always longer than the load arm, providing a mechanical advantage.
- Third-class lever: The effort is applied between the fulcrum and the load (e.g., tweezers or a fishing rod).
Since Option C identifies the arrangement where the load is situated between the fulcrum and the effort, it correctly describes a second-class lever.
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