FPSC Everyday Science MCQs

Bronze is primarily copper alloyed with tin.
It is harder than pure copper.

Crude oil is heated and separated in a fractionating column.
Components condense at different heights according to boiling point.

Steel contains iron with a controlled amount of carbon.
Other alloying elements can modify its properties.

Petrol is a volatile petroleum fraction used in spark-ignition engines.
It contains a blend of hydrocarbons.

Chromium in stainless steel creates a thin passive oxide film.
This layer limits further corrosion.

Higher octane fuel resists premature ignition under compression.
This reduces knocking in suitable engines.

Copper conducts electricity well and can be drawn into wires.
It is also relatively resistant to corrosion.

Cooling slows metabolism of many microorganisms.
It also slows enzyme activity and spoilage reactions.

Aluminium has a low density and good corrosion resistance.
Its alloys are widely used in aircraft.

High salt concentration lowers available water through osmosis.
Many spoilage microbes cannot grow well under these conditions.

Mercury remains liquid at typical room temperatures.
Its toxicity has reduced its use in household instruments.

Concentrated sugar binds water and creates high osmotic pressure.
This inhibits many microorganisms.