Everyday Science MCQs

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

Carbon dioxide does not support combustion and is nonconductive.
It can displace oxygen around a fire.

Acid-carbonate reactions form a salt, water, and carbon dioxide.
The gas causes visible bubbling.

Sound waves can reflect from distant surfaces.
If the delay is sufficient, the reflected sound is heard as an echo.

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

Rusting is an oxidation process requiring oxygen and moisture.
It weakens exposed iron over time.

Baking soda is sodium hydrogen carbonate, NaHCO₃.
It releases carbon dioxide when heated or mixed with acid.

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

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

Galvanization covers iron or steel with zinc.
The coating blocks moisture and can protect sacrificially.

The reaction produces carbon dioxide gas.
Gas bubbles become trapped and expand during heating.

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