PMS Everyday Science MCQs

Muscle cells can produce lactate during anaerobic metabolism.
This supports short-term energy production when oxygen delivery is limited.

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.

Distillation boils water and then condenses the vapor.
Nonvolatile salts remain in the original container.

Atoms are the basic chemical units of elements.
They contain protons, neutrons, and electrons.

Protons carry positive electric charge.
They are located in the atomic nucleus.

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

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

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

O is the chemical symbol for oxygen.
Element symbols use one or two letters.

Iron's symbol Fe comes from the Latin word ferrum.
It is a common structural metal.

Sodium's symbol Na comes from the Latin natrium.
It is a highly reactive alkali metal.