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Quizzes > Science

Science Questions for Kids: Elementary Quiz

Quick, free elementary science quiz with kid-friendly questions. Instant results.

Editorial: Review CompletedCreated By: Silvia RoloffUpdated Aug 28, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art quiz scene shows children exploring science with test tubes books planet and rocket on coral background

This quiz helps young learners practice science questions for kids across elementary topics and see what they know with instant feedback. If you want an easier start, try the science quiz for kindergarten, then build skills with a basic science quiz or stretch with 6th grade science questions.

Which planet is closest to the sun?
Mercury
Venus
Mars
Earth
Mercury is the closest planet to the Sun, orbiting at an average distance of about 58 million kilometers. It appears to move quickly across the sky due to its proximity and swift orbit. Unlike Venus, which is the second planet, Mercury has no substantial atmosphere to trap heat.
What do plants use to make food through photosynthesis?
Oxygen
Nitrogen
Soil
Sunlight
Plants make food through photosynthesis by using sunlight, water, and carbon dioxide to produce glucose and oxygen. Sunlight provides the energy needed to split water molecules and form sugars. Chlorophyll in the leaves captures light energy to drive this process.
What is H2O commonly known as?
Water
Hydrogen peroxide
Oxygen
Salt
H2O is the chemical formula representing two hydrogen atoms bonded to one oxygen atom, forming water. Water covers about 71% of Earth’s surface and is essential for all known forms of life. It can exist in three states: liquid, solid (ice), and gas (vapor) under normal Earth conditions.
Which sense organ do we primarily use to smell?
Ear
Skin
Eye
Nose
The nose contains olfactory receptors that detect odor molecules in the air. When these receptors are stimulated, they send signals to the brain, which interprets them as different smells. This sense is crucial for taste and environmental awareness.
What gas do we exhale in respiration?
Hydrogen
Nitrogen
Carbon dioxide
Oxygen
During cellular respiration, our bodies use oxygen to convert glucose into energy and produce carbon dioxide as a waste product. We inhale oxygen-rich air and exhale carbon dioxide when we breathe out. The exchange occurs in the alveoli of the lungs, transferring gases between blood and the air.
At what temperature does water boil at sea level in Celsius?
120°C
90°C
50°C
100°C
At sea level, the atmospheric pressure is one atmosphere (101.3 kPa), at which pure water boils at 100 degrees Celsius. Boiling occurs when the vapor pressure of the water equals the surrounding atmospheric pressure. Changing elevation alters boiling temperature due to pressure differences.
What force keeps us on the ground?
Magnetism
Gravity
Electricity
Friction
Gravity is the force of attraction between objects that have mass, pulling us toward Earth's center. It is what keeps everything on the ground and governs the motion of planets and stars. Sir Isaac Newton first formulated the law of universal gravitation to describe this force.
What is the process by which caterpillars become butterflies?
Germination
Respiration
Photosynthesis
Metamorphosis
Metamorphosis is the process by which insects like caterpillars transform into butterflies or moths. It typically involves distinct life stages: egg, larva (caterpillar), pupa (chrysalis), and adult butterfly. During the pupal stage, the organism’s tissues are reorganized into the adult form.
Which layer of Earth is liquid?
Outer core
Inner core
Crust
Mantle
Earth’s outer core lies beneath the mantle and is composed of molten iron and nickel, making it a liquid layer. Convection currents within the outer core generate Earth's magnetic field. Below the liquid outer core is the solid inner core under extreme pressure.
What is the chemical symbol for potassium?
P
Pt
Po
K
Potassium is represented by the symbol K on the periodic table from its Latin name 'Kalium.' It is an alkali metal found in group 1 and is highly reactive, especially with water. Potassium ions are vital for nerve function and fluid balance in living organisms.
What organ in the human body produces insulin?
Gallbladder
Pancreas
Liver
Kidney
The pancreas contains clusters of cells called islets of Langerhans that release the hormone insulin into the bloodstream. Insulin helps regulate blood glucose levels by promoting the uptake of sugar into cells for energy. Malfunction or autoimmune destruction of these cells can lead to diabetes.
Which phenomenon causes day and night?
Eclipse
Precession
Revolution
Rotation
Day and night are caused by Earth’s rotation on its axis, which takes approximately 24 hours to complete one full turn. When a part of Earth faces the Sun, it experiences daylight, and when it is turned away, it experiences night. This rotation also influences time zones around the world.
What is the pH value of pure water at 25°C?
7
14
5
0
The pH scale measures the acidity or basicity of a solution from 0 (most acidic) to 14 (most basic). Pure water at 25°C has a neutral pH of 7, meaning it has equal concentrations of hydrogen and hydroxide ions. Temperature changes can slightly alter the pH of pure water.
What type of bond involves the sharing of electron pairs between atoms?
Covalent bond
Hydrogen bond
Ionic bond
Metallic bond
A covalent bond is formed when two atoms share pairs of electrons to achieve stable electron configurations. This type of bonding typically occurs between nonmetal atoms, such as in molecules like water (H2O) and carbon dioxide (CO2). Covalent bonds can be single, double, or triple, depending on the number of shared electron pairs.
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Study Outcomes

  1. Identify Basic Science Facts -

    Recall key elementary science concepts across topics like planets, plants, and animals to build foundational knowledge.

  2. Describe Planetary and Botanical Processes -

    Explain how planets orbit the Sun and how plants grow, demonstrating understanding of Earth and space phenomena.

  3. Classify Living and Non-Living Things -

    Differentiate between living organisms and non-living matter by recognizing their distinct characteristics.

  4. Apply Critical Thinking Skills -

    Use logical reasoning and observational clues to answer elementary science questions and solve quiz challenges.

  5. Analyze Cause-and-Effect Relationships -

    Evaluate how environmental factors influence living organisms and natural processes in various scenarios.

  6. Build Confidence in Science Learning -

    Develop self-assurance and enthusiasm for science by successfully completing quiz questions and tracking progress.

Cheat Sheet

  1. Planets of the Solar System -

    To master children's science questions on planets, remember the order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Use the mnemonic "My Very Educated Mother Just Served Us Nachos" to recall this sequence easily (source: NASA). Draw a simple diagram and label each planet to reinforce memory.

  2. Photosynthesis Basics -

    Elementary science questions often ask how plants make food: 6CO₂ + 6H₂O → C₆H₝₂O₆ + 6O₂ is the core formula (source: National Geographic Kids). Remember "Light + CO₂ + H₂O = Sugar + Oxygen" as a quick phrase. Try explaining this process in your own words to boost confidence in kids science trivia.

  3. States of Matter -

    In a primary school science quiz, you'll encounter solids, liquids, and gases. Solids hold shape, liquids take container shape, and gases fill any space - temperature changes drive transitions (kinetic theory, source: university chemistry departments). Act out molecules moving to visualize each state for extra fun!

  4. Water Cycle Steps -

    Science quiz for kids often covers evaporation, condensation, precipitation, and collection. Picture the sun heating water (evaporation), clouds forming (condensation), rain falling (precipitation), and rivers returning water (collection) (source: USGS). Draw the cycle on paper and label each part to reinforce understanding.

  5. Basic Force and Motion -

    Primary school science quiz questions may ask for Newton's 2nd law: F = m × a, meaning force equals mass times acceleration (source: MIT OpenCourseWare). Use a toy car experiment - vary mass or push harder - to see how acceleration changes. This hands-on trick cements the concept!

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