What is the SI unit of force?

What is the working principle of a hydraulic press?

What is the SI unit of energy?

Which type of energy is stored in a compressed spring?

Which particle carries a negative electric charge in an atom?

What type of lens is thicker at the centre than at the edges?

Which device is used to measure the electric current flowing through a circuit?

Which law states that every action has an equal and opposite reaction?

What is the approximate speed of sound in air at room temperature?

What does a transformer do to alternating current?

Which device converts electrical energy into mechanical energy?