Which of the following is NOT based on the Archimedes’ Principle?

Correct option is A

The correct answer is (a) Designing of aeroplane wings.
· The designing of aeroplane wings is not based on Archimedes’ Principle but rather on Bernoulli's Principle and the laws of aerodynamics, which explain how the pressure difference created by the airflow around the wings generates lift.
Archimedes' Principle states that any object completely or partially submerged in a fluid experiences an upward force (buoyancy) equal to the weight of the fluid displaced by the object. This principle is applied to:
· Ships and submarines : To ensure they float or dive based on the displacement of water.
· Hydrometers and Lactometers : Devices that measure the density or specific gravity of liquids by floating, with their buoyancy depending on the liquid's density.