FPSC Everyday Science MCQs

Parallel branches have the same potential difference.
Switching off one appliance does not stop current in the others.

An electric motor uses magnetic forces on current-carrying conductors.
It converts electrical energy into motion.

A generator uses electromagnetic induction.
Mechanical motion produces electrical energy.

Lightning tends to strike exposed high points and conductors.
Safer shelter is inside a substantial building or closed vehicle.

Bats emit high-frequency sound pulses and detect returning echoes.
This helps them navigate and locate prey.

Heating usually increases particle motion and separation.
This commonly causes thermal expansion.

Light changes speed when moving between media.
This speed change usually causes bending, called refraction.

Metal structures expand in hot weather.
Gaps prevent buckling and structural damage.

Light from the submerged part changes direction when leaving water.
The brain traces rays backward and sees an apparent displacement.

Melting occurs when a solid gains enough energy to become liquid.
It happens at the melting point under fixed pressure.

Spectacle lenses change the convergence of light entering the eye.
They help focus images correctly on the retina.

Freezing removes energy from a liquid until it forms a solid.
For pure water at standard pressure, this occurs at 0°C.