PPSC MCQs

Resistance is measured in ohms.
It describes opposition to electric current.

Electrons carry negative charge.
They occupy regions around the nucleus.

Copper contains mobile electrons that carry current easily.
It is widely used in electrical wiring.

Neutrons are electrically neutral.
They are found in atomic nuclei with protons.

Plastic resists the movement of electric charge.
The covering protects users from electric shock.

A fuse melts when excessive current heats it.
This interrupts the circuit and helps prevent fire or damage.

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.

An element contains atoms with the same number of protons.
It cannot be broken into simpler substances by ordinary chemical means.

A compound contains different elements chemically bonded together.
Its properties differ from those of its constituent elements.