Pakistan MCQs

Atoms are the basic chemical units of elements.
They contain protons, neutrons, and electrons.

Protons carry positive electric charge.
They are located in the atomic nucleus.

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

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

The proton number is the atomic number.
Changing the proton number creates a different element.

O is the chemical symbol for oxygen.
Element symbols use one or two letters.

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.

Soft porous materials absorb part of the sound energy.
This reduces excessive reverberation and improves clarity.

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