Everyday Science MCQs

Electrons carry negative charge.
They occupy regions around the nucleus.

Bases accept protons according to Brønsted-Lowry theory.
Many aqueous bases produce hydroxide ions.

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

Copper contains mobile electrons that carry current easily.
It is widely used in electrical wiring.

Neutrons are electrically neutral.
They are found in atomic nuclei with protons.

pH values below 7 indicate acidity.
A pH of 3 is distinctly acidic.

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

Plastic resists the movement of electric charge.
The covering protects users from electric shock.

The proton number is the atomic number.
Changing the proton number creates a different element.

pH values above 7 indicate basicity.
A pH of 10 is alkaline.

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

A fuse melts when excessive current heats it.
This interrupts the circuit and helps prevent fire or damage.