P4 Science Questions — Free MCQ Practice & Revision with Answers
Primary 4 science introduces three major physical science topics for the first time: light, heat and temperature, and matter. Students also study the human digestive system and plant parts. This page links to free MCQ practice for every P4 topic, with instant answers and detailed explanations for each question.
Looking for Primary 4 Science questions with answers? Start with the free set below, then practise more questions by topic, including dedicated practice for P4 matter.
What Your Child Learns in P4
Primary 4 is a pivotal year in the science curriculum. It is the first time students encounter physical science concepts alongside biological systems. The syllabus is organised around five themes: Diversity, Cycles, Systems, Energy, and Interactions.
The jump from P3 to P4 is significant. While P3 focuses on observable, concrete topics like plants, animals, and magnets, P4 introduces abstract concepts such as heat energy, the difference between heat and temperature, and the properties of matter. Students must move beyond memorisation and learn to apply concepts to unfamiliar scenarios.
P4 Science Topics
Light
EnergyStudents learn how we see objects, that light travels in straight lines, and how shadows are formed. They investigate how the size and shape of a shadow change when the object or light source is moved.
Practice Light MCQ →Heat & Temperature
EnergyStudents learn the difference between heat and temperature, how heat flows from hotter to colder objects, and the effects of heat gain and loss — including expansion, contraction, and changes of state. They also identify good and poor conductors of heat.
Practice Heat & Temperature MCQ →Matter
CyclesStudents learn that matter is anything with mass that occupies space. They compare the three states of matter — solid, liquid, and gas — by their shape and volume, and practise measuring mass and volume.
Practice Matter MCQ →Digestive System
SystemsStudents identify the organs of the human digestive system and learn the function of each organ, from the mouth through to the large intestine. This topic builds understanding of how the body processes food.
Dedicated topic page coming soonPlant Parts and Their Functions
SystemsStudents identify the main parts of a plant — roots, stem, leaves, and flowers — and learn the function of each part. This topic builds on P3 diversity concepts and connects to plant reproduction in P5.
Dedicated topic page coming soonPractice Questions
Try these P4 science MCQs covering light, heat and temperature, and matter. Each question includes a detailed explanation of why every option is right or wrong.
Study Tips for P4 Science
Understand the difference between heat and temperature early
Heat and temperature are the most commonly confused P4 concepts. Heat is energy that flows from a hotter object to a colder one. Temperature is a measurement of how hot something is. A swimming pool and a cup of hot tea illustrate this well: the pool has more heat energy (because of its larger volume), but the tea has a higher temperature. Practise distinguishing the two with everyday examples before attempting MCQs.
Use comparison tables for matter
Draw a simple table comparing solids, liquids, and gases across three properties: shape, volume, and compressibility. This single table covers a large portion of P4 matter questions. Stick it on your study wall and refer to it when practising. Most MCQ distractors for matter questions mix up one of these three properties.
Learn the two shadow rules by heart
Shadow size questions follow two reliable rules. NLB: Near Light, Bigger — when the object moves closer to the light source, the shadow gets bigger. NSS: Near Screen, Smaller — when the object moves closer to the screen, the shadow gets smaller. Before answering any shadow question, identify which direction the object is moving and apply the correct rule.
Connect science to daily life
P4 science questions are increasingly application-based. Rather than memorising definitions, try to spot science concepts in everyday situations. Why does a metal spoon feel hot in soup but a plastic one does not? Why can you see yourself in a mirror but not through a wall? Why does a balloon deflate in cold weather? Discussing these at home builds the reasoning skills that MCQ questions test.
Read every option before choosing your answer
A common P4 mistake is choosing the first option that seems correct without reading all four. In well-written MCQs, distractors are deliberately plausible. Option A might sound right, but Option C might be more precise. Train yourself to read all four options and eliminate wrong ones before confirming your choice. This habit prevents careless errors and builds exam discipline for PSLE.
Other Levels
Living and non-living things, animal and plant classification, life cycles, and magnets
Electrical circuits, plant reproduction, water cycle, photosynthesis, and human body systems
Food chains, food webs, forces, adaptations, and full PSLE revision across all levels
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