N-Level Combined Science 1

Question 1

What is the chemical symbol for water?

Accepted Answer

H₂O

Answer

Water's chemical formula is H₂O — two hydrogen atoms bonded to one oxygen atom.

Question 2

What force keeps us on the ground?

Accepted Answer

Gravity

Answer

Gravity is the force of attraction between all objects with mass. Earth's gravity pulls objects towards its centre, keeping us on the ground.

Question 3

Which organ pumps blood around the body?

Accepted Answer

Heart

Answer

The heart is a muscular pump that circulates blood around the body, delivering oxygen and nutrients to all organs and tissues.

Question 4

What gas do plants take in during photosynthesis?

Accepted Answer

Carbon dioxide

Answer

During photosynthesis, plants absorb carbon dioxide (CO₂) from the air and use it, along with water and sunlight, to produce glucose.

Question 5

What is the state of matter with no fixed shape and no fixed volume?

Accepted Answer

Gas

Answer

A gas has no fixed shape and no fixed volume — it expands to fill any container. Its particles move rapidly and are far apart.

GCE N-Level Practice Test