N-Level Science

Question 1

What is the chemical formula for water?

Accepted Answer

H₂O

Answer

Water's chemical formula is H₂O, meaning each molecule consists of two hydrogen atoms bonded to one oxygen atom through covalent bonds.

Question 2

What is photosynthesis?

Accepted Answer

The process by which green plants use sunlight to convert carbon dioxide and water into glucose and oxygen

Answer

Photosynthesis is the process: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. It occurs in chloroplasts using chlorophyll to capture light energy and convert it into chemical energy stored in glucose.

Question 3

What is the SI unit of force?

Accepted Answer

Newton

Answer

The SI unit of force is the newton (N), named after Sir Isaac Newton. One newton is the force needed to accelerate a mass of 1 kg by 1 m/s².

Question 4

In the human body, what is the function of red blood cells?

Accepted Answer

To transport oxygen from the lungs to body tissues using haemoglobin

Answer

Red blood cells contain haemoglobin, which binds to oxygen in the lungs and transports it to cells throughout the body. They are biconcave in shape to maximise surface area for gas exchange.

Question 5

What is an electric circuit?

Accepted Answer

A closed loop through which electric current can flow, consisting of a power source, conductors, and electrical components

Answer

An electric circuit is a complete closed path that allows electric current to flow from a power source (battery), through conductors (wires) and components (bulbs, resistors), and back to the source.

GCE N-Level Practice Test

GCE N-Level Practice Test

N-Level Science