PPSC MCQs

Carbon dioxide contains one carbon atom and two oxygen atoms.
Its formula is CO₂.

Common table salt is sodium chloride.
It consists of sodium and chloride ions.

Most common combustion reactions require oxygen.
Removing oxygen can extinguish a fire.

Mixture components retain many of their own properties.
They can often be separated by physical methods.

Sand particles are too large to pass through filter paper.
Water passes through as the filtrate.

Evaporation removes water as vapor.
The dissolved salt remains behind as crystals.

Electric current measures charge passing a point per unit time.
Its SI unit is the ampere.

Distillation boils water and then condenses the vapor.
Nonvolatile salts remain in the original container.

Electric current is measured in amperes.
An ampere equals one coulomb of charge per second.

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

Voltage represents energy transferred per unit charge.
It drives current through a circuit.

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