Science MCQs

Wood is a fuel that can catch fire (combust) while the other options are not.

Strong heating of sugar (a process called caramelization and then charring) decomposes it into carbon (black residue) and water vapor.

The solute is the component that is dissolved (e.g. salt sugar).

Hardness is a physical property describing resistance to scratching. The other options describe its chemical behavior.

Sulphur dioxide (SO2) and nitrogen oxides (NOx) react with water vapor in the atmosphere to form acidic compounds.

Copper is used in wiring primarily because it is an excellent conductor of electricity a physical property.

The chemical property of baking powder (sodium bicarbonate) is to decompose upon heating and release carbon dioxide gas which creates bubbles and makes the cake rise.

Chlorine compounds in detergents have a chemical property that allows them to bleach stains and remove colors.

Digestion involves enzymes breaking down food into simpler substances (a chemical change). Chewing and swallowing are physical processes.

Magnesium metal (Mg) reacts with oxygen (O2) in the air to form magnesium oxide (MgO).