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Quizzes > Science

3rd Grade Science Questions: Class 3 Practice Quiz

Quick science quiz for grade 3 to check core topics. Instant results.

Editorial: Review CompletedCreated By: Wayne PotgieterUpdated Aug 23, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art grade 3 science quiz header with colorful letters planets test tubes on dark blue background

This Class 3 science quiz helps you review key third-grade topics like the water cycle, ecosystems, and simple machines, and spot what to study next. After you try it, explore more with science questions for kids or switch subjects with a 3rd grade geography quiz.

Which part of a plant absorbs water and nutrients from the soil?
Stem
Flower
Root
Leaf
Roots absorb water and minerals from the soil, anchoring the plant. This water travels up the stem to the rest of the plant. Leaves then use this water in photosynthesis to produce food. .
What state of matter is water at room temperature?
Solid
Plasma
Gas
Liquid
At room temperature, water has molecules that move freely but stay close together, making it a liquid. Liquids take the shape of their container but have a fixed volume. Changes in temperature can turn water to ice or vapor. .
Which sense helps you smell food?
Touch
Sight
Smell
Taste
The sense of smell uses receptors in the nose to detect airborne chemicals. When we sniff, odor particles bind to these receptors, sending signals to the brain. This system helps us identify different scents and flavors. .
What color results when red and blue paint are mixed?
Orange
Purple
Brown
Green
Mixing red and blue paint combines pigments that absorb and reflect different wavelengths of light, producing purple. This is an example of color mixing using primary colors. Artists use this principle to create new hues. .
The process by which water changes from liquid to gas is called what?
Evaporation
Collection
Condensation
Precipitation
Evaporation occurs when water gains energy and changes from liquid to water vapor. Heat from the sun speeds up this process. It is a key part of the water cycle, returning water to the atmosphere. .
Which planet is known as the Red Planet?
Mars
Venus
Jupiter
Earth
Mars is called the Red Planet because its surface is covered with iron oxide dust, giving it a reddish color. It is the fourth planet from the Sun and has two small moons, Phobos and Deimos. Scientists study Mars to learn about past water and potential for life. .
What force pulls objects toward the center of the Earth?
Gravity
Electricity
Magnetism
Friction
Gravity is the force that attracts any two objects with mass toward each other. Earth's large mass gives it a strong gravitational pull, keeping us and other objects grounded. Without gravity, everything would float off into space. .
Which organ helps digest food by using acids and enzymes?
Lungs
Heart
Stomach
Liver
The stomach uses gastric acids and enzymes to break down food into nutrients the body can absorb. It churns food into a semi-liquid mixture called chyme. This process is vital for digestion before food moves to the intestines. .
What gas do animals release during respiration that plants use for photosynthesis?
Oxygen
Nitrogen
Carbon Dioxide
Hydrogen
Animals exhale carbon dioxide as a waste product of cellular respiration. Plants take in carbon dioxide to perform photosynthesis, producing oxygen and glucose. This exchange of gases is part of the carbon cycle. .
Which simple machine is represented by a seesaw?
Wheel and Axle
Inclined Plane
Pulley
Lever
A seesaw is a lever, which is a rigid bar that pivots around a fixed point called a fulcrum. Levers help lift or move loads with less effort. The seesaw's plank and fulcrum demonstrate how a lever works in real life. .
During which phase of the moon is it fully illuminated as seen from Earth?
Crescent Moon
Half Moon
Full Moon
New Moon
The full moon phase occurs when the Earth is between the sun and the moon, allowing the sun's light to fully illuminate the moon's surface as seen from Earth. This phase is visible all night long. It happens roughly once every 29.5 days. .
What type of animal is a frog classified as?
Mammal
Reptile
Insect
Amphibian
Frogs are amphibians, which means they can live both in water and on land. They undergo metamorphosis from tadpoles with gills to adult frogs with lungs. Amphibians have moist skin and lay eggs in water. .
What do we call an organism that makes its own food through processes like photosynthesis?
Scavenger
Decomposer
Producer
Consumer
Producers, such as plants and algae, create their own food by converting sunlight into chemical energy through photosynthesis. They form the base of food chains, supplying energy to consumers. Decomposers and scavengers break down dead matter later in the cycle. .
Which layer of the Earth do we live on?
Crust
Atmosphere
Core
Mantle
The Earth's crust is its outermost layer, composed of solid rock that forms continents and ocean floors. It is thinner than the layers beneath it, the mantle and core. Most geological activity like earthquakes occurs in the crust. .
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Study Outcomes

  1. Understand States of Matter -

    Learn to distinguish solids, liquids, and gases by exploring real-life examples in our asset science quiz designed for Grade 3 science quiz practice.

  2. Identify Simple Machines -

    Recognize levers, pulleys, and inclined planes in everyday tools, reinforcing class 3 science questions and boosting hands-on comprehension.

  3. Apply Scientific Vocabulary -

    Use key asset science terms correctly when answering questions, strengthening your command of science language in this free science practice test.

  4. Differentiate Living and Non-living Things -

    Analyze characteristics that set organisms apart from inanimate objects through targeted quiz items aligned with Grade 3 standards.

  5. Evaluate Your Answers Instantly -

    Receive real-time feedback on your responses to understand mistakes and learn correct explanations immediately.

  6. Strengthen Problem-solving Skills -

    Build critical thinking by tackling a variety of asset science scenarios and refining strategies in a fun, interactive format.

Cheat Sheet

  1. States of Matter -

    In this asset science quiz, you'll classify matter by shape and volume: solids hold their shape, liquids take the shape of their container, and gases fill any space available. According to the American Chemical Society, temperature changes cause transitions like ice melting into water or water boiling into steam. Try the "Silly Little Ghosts" mnemonic (S-L-G) to recall Solid, Liquid, and Gas in your grade 3 science quiz.

  2. Simple Machines -

    The grade 3 science quiz on simple machines focuses on six key tools - lever, pulley, wheel and axle, inclined plane, wedge, and screw - as outlined by NASA Glenn Research Center. Understanding how each machine makes work easier, such as a lever amplifying force, is essential for class 3 science questions. Use the fun phrase "Let's Put Wheels In Smart Circles" to remember Lever, Pulley, Wheel & axle, Inclined plane, Screw, and Wedge.

  3. Water Cycle Stages -

    Our class 3 science questions on the water cycle cover evaporation, condensation, precipitation, and collection, following the USGS model. Evaporation turns liquid water into vapor, condensation forms clouds, and precipitation returns water as rain or snow. A catchy mnemonic is "Even Clouds Pour Constantly" (E-C-P-C) to help you ace the science practice test.

  4. Ecosystems and Food Chains -

    National Geographic Kids defines ecosystems by producers (plants), consumers (animals), and decomposers (fungi/bacteria) that cycle nutrients in nature. A sample food chain like grass → rabbit → fox illustrates how energy moves through these levels. Remember "Please Cook Dinner" for Producers, Consumers, Decomposers in your asset science quiz.

  5. Plant Structure & Photosynthesis -

    The USDA explains that roots absorb water, leaves capture sunlight, and stems transport nutrients, all crucial for class 3 science questions on plants. Photosynthesis is summarized by the equation 6CO₂ + 6H₂O → C₆H₝₂O₆ + 6O₂, showing how plants make glucose and oxygen. Visualize this process as "CO₂ + H₂O → O₂ + Sugar" to confidently tackle your grade 3 science quiz.

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