Everyday Science MCQs

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.

Osmosis is a special case of water movement across a membrane.
It affects cell volume and water balance.

The embryo requires energy for growth.
Respiration releases this energy from stored food.

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.

Water enters the cell and enlarges the vacuole.
The cell contents press against the wall, making the cell turgid.

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.

Tissues consist of coordinated cells with related roles.
Examples include muscle tissue and epithelial tissue.

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.