Hydraulic lift is a device used to lift heavy loads. State the principle behind the working of this device.

State the principle on which ELISA works.

The schematic diagram of a sprayer atomiser is given below. Name the principle of working of this device from the following : (i)Surface tension (ii)Viscosity (iii)Bernoulli's principle (iv)Archimedes principle.

Which is the device used to generate electricity ?

A hydraulic lift is designed to lift a maximum, mass of 3000 kg and area of the piston carrying it is 425 cm^(2) . What is the maximum pressure \that should be applied to the smaller piston?