N-Level Combined Science 2

Question 1

What is the process by which a liquid changes into a gas?

Accepted Answer

Evaporation

Answer

Evaporation is the process by which a liquid changes into a gas at the surface of the liquid. It can occur at temperatures below the boiling point.

Question 2

What is an atom?

Accepted Answer

The smallest part of an element that retains the chemical properties of that element

Answer

An atom is the smallest unit of an element that retains the chemical properties of that element. It consists of protons, neutrons, and electrons.

Question 3

Which type of diet is essential for good health?

Accepted Answer

A balanced diet with carbohydrates, proteins, fats, vitamins, minerals, and water

Answer

A balanced diet includes all essential nutrients in the right proportions: carbohydrates (energy), proteins (growth/repair), fats (energy store), vitamins and minerals (body functions), and water.

Question 4

What does a voltmeter measure?

Accepted Answer

Voltage (potential difference)

Answer

A voltmeter measures the voltage (potential difference) across two points in a circuit. It is connected in parallel.

Question 5

What is the function of the lungs?

Accepted Answer

To exchange gases — absorbing oxygen and releasing carbon dioxide

Answer

The lungs are the organs of gas exchange — oxygen from inhaled air enters the blood, and carbon dioxide from the blood is exhaled.

GCE N-Level Practice Test

GCE N-Level Practice Test

N-Level Combined Science 2