FPSC Everyday Science MCQs

Chlorine in controlled amounts disinfects water.
It reduces disease-causing bacteria and viruses.

Polymers consist of repeating monomer units.
Many plastics, fibers, and biological molecules are polymers.

Calcium and magnesium ions cause hardness.
Hard water forms scale and reduces soap lather.

Strong polymer structures can resist decomposition.
This durability is useful but creates waste-management problems.

Hardness ions react with soap molecules.
The insoluble products waste soap and reduce lather.

Natural gas consists mainly of methane.
It burns relatively cleanly compared with coal.

Temporary hardness is caused mainly by bicarbonates.
Boiling converts them into insoluble precipitates.

Liquefied petroleum gas is mainly propane and butane.
Pressure keeps these gases liquid in cylinders.

Alloys combine metals with other elements.
They are designed for strength, corrosion resistance, or other useful properties.

Coal formed from buried plant matter over geological time.
Heat and pressure changed the material into carbon-rich fuel.

Brass contains mainly copper and zinc.
It is used in fittings, instruments, and decorative items.

Crude petroleum contains many hydrocarbon compounds.
Refining separates it into useful fractions.