120 True False Science Questions With Answers: Easy to Hard

These 120 true false science questions with answers cover biology, the human body, Earth science, physics, chemistry, space, and general scientific knowledge. The questions begin with familiar concepts before moving into statements that require more careful scientific reasoning.

Use the collection for classroom warm-ups, science review, homework, team competitions, formative assessment, or a quick knowledge check. Every false statement includes a correction so students can learn from the answer instead of simply seeing True or False.

120 True False Science Questions With Answers

The questions are organized by subject and difficulty. Teachers can use one section for a focused lesson or mix several categories for a broader science review.

• Questions 1–20: Easy General Science
• Questions 21–40: Biology and Living Things
• Questions 41–55: Human Body Science
• Questions 56–70: Earth and Environmental Science
• Questions 71–85: Physics
• Questions 86–100: Chemistry
• Questions 101–110: Space and Astronomy
• Questions 111–120: Hard Science Challenge

Easy General Science True or False Questions — 1–20

1. Earth orbits the Sun.
   Answer: True. Earth completes one orbit around the Sun in about one year.
2. Plants can use light energy during photosynthesis.
   Answer: True. Photosynthesis converts light energy into chemical energy.
3. Sound can travel through a perfect vacuum.
   Answer: False. Sound requires matter through which mechanical vibrations can travel.
4. The chemical formula for water is H₂O.
   Answer: True. A water molecule contains two hydrogen atoms and one oxygen atom.
5. Oxygen makes up most of Earth's atmosphere.
   Answer: False. Nitrogen makes up about 78% of the atmosphere, while oxygen accounts for about 21%.
6. The Sun is a star.
   Answer: True. The Sun is the star at the center of our Solar System.
7. All mammals lay eggs.
   Answer: False. Most mammals give birth to live young; only monotremes such as the platypus and echidnas lay eggs.
8. Ice is less dense than liquid water.
   Answer: True. This lower density is why ice floats.
9. Electrons have a positive electric charge.
   Answer: False. Electrons carry negative electric charge.
10. Earth has one natural satellite large enough to be commonly called its Moon.
    Answer: True. Earth's natural satellite is the Moon.
11. Venus is the closest planet to the Sun.
    Answer: False. Mercury is the closest planet to the Sun.
12. Light travels faster than sound.
    Answer: True. Light moves vastly faster than sound under ordinary conditions.
13. Spiders are insects.
    Answer: False. Spiders are arachnids and normally have eight legs rather than the six found in insects.
14. Photosynthesis can release oxygen.
    Answer: True. Oxygen is produced during oxygenic photosynthesis.
15. A typical adult human skeleton has 206 bones.
    Answer: True. The commonly cited adult total is 206, although small anatomical variations can occur.
16. Water always boils at exactly 100°C everywhere on Earth.
    Answer: False. Boiling temperature changes with atmospheric pressure.
17. Bats are naturally blind.
    Answer: False. Bats can see, and many species also use echolocation.
18. Jupiter is the largest planet in the Solar System.
    Answer: True. Jupiter is the largest planet by both mass and diameter.
19. Fungi are classified as plants.
    Answer: False. Fungi form their own major group of organisms and differ fundamentally from plants.
20. DNA is found only in blood cells.
    Answer: False. DNA occurs in many types of cells; mature human red blood cells are actually unusual because they lack nuclei.

Biology and Living Things True or False Questions — 21–40

1. Mitochondria are involved in cellular respiration.
   Answer: True. Mitochondria play a major role in producing ATP in eukaryotic cells.
2. Chlorophyll is naturally a bright red pigment.
   Answer: False. Chlorophyll appears green because of the wavelengths of light it reflects.
3. All bacteria are harmful to humans.
   Answer: False. Many bacteria are harmless or beneficial, including organisms important to digestion and ecosystems.
4. Whales are fish.
   Answer: False. Whales are mammals that breathe air with lungs.
5. Many amphibians undergo metamorphosis during their life cycle.
   Answer: True. Frogs, for example, develop from aquatic tadpoles into adults.
6. Human and chimpanzee DNA sequences are completely identical.
   Answer: False. Humans and chimpanzees share a very high degree of genetic similarity, but their genomes are not identical.
7. Some fungi act as decomposers in ecosystems.
   Answer: True. They break down dead organic matter and help recycle nutrients.
8. Viruses can reproduce completely independently without using a host cell.
   Answer: False. Viruses depend on host-cell machinery to replicate.
9. Red blood cells contain hemoglobin.
   Answer: True. Hemoglobin binds oxygen and helps transport it through the body.
10. Shark skeletons are made primarily of bone.
    Answer: False. Sharks have skeletons made mainly of cartilage.
11. An octopus has three hearts.
    Answer: True. Two pump blood toward the gills and one pumps it through the rest of the body.
12. Adult insects normally have six legs.
    Answer: True. Three pairs of legs are a defining feature of adult insects.
13. Every species of snake is venomous.
    Answer: False. Many snake species are nonvenomous.
14. Modern birds are descendants of theropod dinosaurs.
    Answer: True. Extensive fossil and anatomical evidence links birds to theropod dinosaurs.
15. Corals are plants.
    Answer: False. Corals are animals, although many live in partnership with photosynthetic algae.
16. Enzymes can speed up biochemical reactions.
    Answer: True. Enzymes act as biological catalysts.
17. Adult frogs exchange gases only through their lungs.
    Answer: False. Many frogs can also exchange gases through their moist skin.
18. A cell membrane helps control which substances enter and leave a cell.
    Answer: True. Cell membranes are selectively permeable.
19. Bacteria have membrane-bound nuclei like animal cells do.
    Answer: False. Bacteria are prokaryotes and do not have a membrane-bound nucleus.
20. Natural selection can change the characteristics of populations over generations.
    Answer: True. Differential survival and reproduction can change trait frequencies over time.

Human Body True or False Science Questions — 41–55

1. The human heart has four chambers.
   Answer: True. It has two atria and two ventricles.
2. The liver is the largest internal organ in the human body.
   Answer: True. The liver is the largest solid internal organ.
3. Most nutrient absorption takes place in the stomach.
   Answer: False. Most nutrient absorption occurs in the small intestine.
4. The kidneys help filter waste products from the blood.
   Answer: True. They also help regulate water, salts, and acid-base balance.
5. Every artery in the human body carries oxygen-rich blood.
   Answer: False. Pulmonary arteries carry oxygen-poor blood from the heart toward the lungs.
6. The cerebellum contributes to balance and coordination.
   Answer: True. It plays an important role in coordinated movement.
7. Humans normally have three lungs.
   Answer: False. Humans normally have two lungs.
8. Insulin is produced by cells in the pancreas.
   Answer: True. Beta cells in pancreatic islets produce insulin.
9. Skin is the largest organ of the human body.
   Answer: True. It forms the body's outer protective covering.
10. The appendix has absolutely no biological function.
    Answer: False. Research indicates that the appendix contains immune tissue and may have roles related to gut microbes.
11. Most oxygen in human blood is transported by hemoglobin.
    Answer: True. Hemoglobin in red blood cells binds most transported oxygen.
12. The left human lung is larger than the right lung.
    Answer: False. The left lung is smaller because it shares space with the heart.
13. Neurons communicate using electrical and chemical signals.
    Answer: True. Electrical impulses travel along neurons, while chemical neurotransmitters often carry signals across synapses.
14. Human bones are completely solid all the way through.
    Answer: False. Bones contain different tissues, including compact and spongy bone, marrow, blood vessels, and nerves.
15. Blood inside human veins is blue.
    Answer: False. Human blood is red; oxygen-poor blood is darker red, not blue.

Earth and Environmental Science True or False Questions — 56–70

1. Earth's inner core is solid.
   Answer: True. Immense pressure keeps the inner core solid despite its high temperature.
2. Earth's tectonic plates move over geological time.
   Answer: True. Plate motion drives processes such as seafloor spreading, mountain building, and many earthquakes.
3. Earth is a perfect sphere.
   Answer: False. Earth is slightly flattened at the poles and wider near the equator.
4. Lightning can never strike the same location twice.
   Answer: False. Tall structures and other locations can be struck repeatedly.
5. Most of Earth's freshwater is stored in rivers and lakes.
   Answer: False. Much of Earth's freshwater is frozen in glaciers and ice caps or stored underground.
6. Nitrogen is the most abundant gas in Earth's atmosphere.
   Answer: True. Nitrogen accounts for roughly 78% of dry air.
7. The Moon's gravity is a major cause of Earth's ocean tides.
   Answer: True. The Sun also affects tides, but the Moon has a major tidal influence.
8. Earthquakes can occur only directly on plate boundaries.
   Answer: False. Most occur near plate boundaries, but intraplate earthquakes also happen.
9. Most natural diamonds formed when buried coal was compressed deep underground.
   Answer: False. Most natural diamonds formed deep in Earth's mantle from carbon sources unrelated to coal deposits.
10. Earth's magnetic field helps shield the planet from charged particles from space.
    Answer: True. The magnetosphere deflects many charged particles carried by the solar wind.
11. Most everyday weather occurs in the troposphere.
    Answer: True. The troposphere is the lowest major layer of Earth's atmosphere.
12. The ozone hole and global warming are exactly the same environmental problem.
    Answer: False. Ozone depletion and climate change involve different primary mechanisms, although atmospheric processes can interact.
13. Volcanoes exist only on land.
    Answer: False. Large numbers of volcanoes occur beneath the oceans.
14. The continents continue to move today.
    Answer: True. They move as parts of tectonic plates, generally at rates of centimeters per year.
15. The Mariana Trench is located in the Atlantic Ocean.
    Answer: False. The Mariana Trench is in the western Pacific Ocean.

Physics True or False Questions — 71–85

1. Newton's second law can be written as F = ma for constant mass.
   Answer: True. Force equals mass multiplied by acceleration in this common form.
2. Mass and weight mean exactly the same thing in physics.
   Answer: False. Mass measures the amount of matter or inertia, while weight is a force caused by gravity.
3. A mechanical sound wave requires a medium to propagate.
   Answer: True. Sound travels through matter such as gases, liquids, or solids.
4. The speed of light in a vacuum is approximately 300,000 kilometers per second.
   Answer: True. The exact defined value is 299,792,458 meters per second.
5. Without air resistance, objects near Earth fall with the same gravitational acceleration regardless of their mass.
   Answer: True. Differences seen in air often come from drag rather than gravitational acceleration itself.
6. Energy can be created from nothing and permanently destroyed.
   Answer: False. In an isolated system, total energy is conserved, though it can change form.
7. An ordinary bar magnet has both a north and a south magnetic pole.
   Answer: True. Cutting a bar magnet creates smaller magnets that still have both poles.
8. Temperature directly measures the total thermal energy contained in an object.
   Answer: False. Temperature is related to the average kinetic behavior of particles, while total thermal energy also depends on the amount and type of matter.
9. Absolute zero is equal to 0°C.
   Answer: False. Absolute zero is 0 kelvin, equal to -273.15°C.
10. Friction is always undesirable.
    Answer: False. Friction allows activities such as walking, gripping objects, and braking vehicles.
11. For the same force, applying it over a smaller area produces greater pressure.
    Answer: True. Pressure is force divided by area.
12. The ampere is an SI unit of electric current.
    Answer: True. Electric current is measured in amperes.
13. Visible light is a form of electromagnetic radiation.
    Answer: True. Visible light occupies one region of the electromagnetic spectrum.
14. Radio waves move more slowly than visible light in a vacuum.
    Answer: False. All electromagnetic waves travel at the same speed in a vacuum.
15. An object moving at constant velocity in empty space needs a continuous net force to keep moving.
    Answer: False. By inertia, an object maintains constant velocity when no net force acts on it.

Chemistry True or False Questions — 86–100

1. The modern periodic table is arranged primarily by atomic number.
   Answer: True. Atomic number equals the number of protons in an atom's nucleus.
2. Pure water has a pH of about 7 at 25°C.
   Answer: True. At that temperature, pure water is approximately neutral.
3. Sodium chloride is a metallic element.
   Answer: False. Sodium chloride is an ionic compound made from sodium and chlorine.
4. Atoms consist mostly of empty space at the scale of the nucleus and electron cloud.
   Answer: True. The nucleus occupies an extremely small fraction of an atom's volume.
5. An acidic solution normally has a pH greater than 7.
   Answer: False. On the common aqueous pH scale, acidic solutions generally have a pH below 7.
6. Helium is denser than ordinary air under the same conditions.
   Answer: False. Helium is much less dense than air.
7. The chemical symbol for gold is Ag.
   Answer: False. Gold is Au; Ag is silver.
8. A chemical reaction can rearrange atoms into different substances.
   Answer: True. Chemical bonds can break and form while atoms are rearranged.
9. Isotopes of the same element have the same number of protons but different numbers of neutrons.
   Answer: True.
10. Rusting iron is only a physical change.
    Answer: False. Rusting is a chemical process that forms iron oxides.
11. Noble gases are generally among the most chemically reactive elements.
    Answer: False. Noble gases are generally known for relatively low chemical reactivity.
12. A carbon dioxide molecule contains one carbon atom and two oxygen atoms.
    Answer: True. Its molecular formula is CO₂.
13. Electrons are located inside the atomic nucleus with protons and neutrons.
    Answer: False. Electrons occupy quantum states around the nucleus.
14. A catalyst must be permanently consumed by the reaction it speeds up.
    Answer: False. A catalyst participates in the reaction mechanism but is regenerated overall.
15. Diamond and graphite are different forms of carbon.
    Answer: True. They are allotropes with different atomic structures and properties.

Space and Astronomy True or False Questions — 101–110

1. The Moon is visible mainly because it reflects sunlight.
   Answer: True. The Moon does not produce visible light in the way the Sun does.
2. Earth's seasons are mainly caused by Earth being much closer to the Sun in summer.
   Answer: False. The seasons are primarily caused by Earth's axial tilt as it orbits the Sun.
3. Mars has two small natural moons.
   Answer: True. They are Phobos and Deimos.
4. Venus is the hottest planet in the Solar System.
   Answer: True. Its dense carbon-dioxide atmosphere produces an intense greenhouse effect.
5. Mercury is the hottest planet because it is closest to the Sun.
   Answer: False. Venus has the highest average surface temperature.
6. The Sun contains most of the mass in the Solar System.
   Answer: True. The Sun accounts for more than 99% of the Solar System's mass.
7. Every planet in the Solar System has at least one moon.
   Answer: False. Mercury and Venus have no natural moons.
8. Pluto is classified as a dwarf planet.
   Answer: True.
9. A black hole automatically pulls in everything in the universe.
   Answer: False. A black hole's gravity affects surrounding objects according to mass and distance, just like other gravitational sources.
10. Stars would visibly twinkle in empty space for the same reason they appear to twinkle from Earth's surface.
    Answer: False. The familiar twinkling is largely caused by Earth's turbulent atmosphere.

Hard True or False Science Questions — 111–120

1. A photon has zero rest mass.
   Answer: True. Photons carry energy and momentum despite having zero invariant rest mass.
2. Mature human red blood cells contain a nucleus.
   Answer: False. Mature mammalian red blood cells lose their nuclei during development.
3. At its triple point, water can exist as solid, liquid, and vapor in equilibrium.
   Answer: True.
4. The entropy of an isolated system tends to decrease spontaneously according to the second law of thermodynamics.
   Answer: False. The second law states that entropy of an isolated system does not spontaneously decrease overall.
5. Neutrinos have no electric charge.
   Answer: True. They are electrically neutral elementary particles.
6. Protons and neutrons are indivisible fundamental particles with no smaller constituents.
   Answer: False. Protons and neutrons are composite particles made from quarks bound by the strong interaction.
7. Light normally travels faster through glass than through a vacuum.
   Answer: False. Light's propagation through glass is slower than its speed in a vacuum.
8. Antimatter includes antiparticles corresponding to ordinary matter particles.
   Answer: True. For example, the positron is the antiparticle of the electron.
9. Earth's inner core is cooler than boiling water.
   Answer: False. The inner core is thousands of degrees Celsius.
10. The modern periodic table contains 118 recognized chemical elements.
    Answer: True.

Find More True or False Questions Beyond Science

Science works well for classroom review, but the same True or False format can also be used for seasonal topics, general knowledge, personal icebreakers, math, history, and other subjects.

Explore these true or false questions with answers when you want more topics while keeping the same two-choice question format.

Turn Science True or False Questions Into an Online Quiz

Once you have chosen questions that match the lesson, arrange them so students begin with concepts they recognize before moving into statements that require closer reasoning.

Use the True or False Quiz Maker when you want to turn the selected statements into a scored digital activity.

Correct Every False Statement

Showing only “False” tells students whether they were wrong but not why. Add the corrected scientific idea so the question also functions as a learning opportunity.

Avoid Obvious Clue Words

Statements containing words such as “always,” “never,” or “every” can sometimes reveal the answer before students evaluate the science. Use absolute language only when it is scientifically necessary.

Mix True and False Answers

Avoid long predictable sequences. A balanced answer distribution keeps students focused on the content instead of guessing from a pattern.

Use Science True or False Questions in the Classroom

For Lesson Warm-Ups

Choose three to five statements about material students studied previously. Ask students to answer first and explain their reasoning before revealing the correct response.

For Formative Assessment

Use a short set of statements after teaching a concept. Incorrect answers can reveal misconceptions that need clarification before the class moves forward.

For Review Before a Test

Mix biology, chemistry, physics, Earth science, and space when preparing for a broad assessment. For a subject-specific test, select statements only from the relevant sections.

For Team Challenges

Give teams a short discussion period before they commit to True or False. Requiring a reason for the answer can make the activity more useful than guessing alone.

Organize Science Questions by Topic and Difficulty

A large science collection becomes easier to reuse when each statement is tagged by subject, learning objective, and difficulty. For example, biology questions can be separated from physics, while harder misconceptions can be saved for later review.

If you regularly create quizzes for several classes or units, learn how to organize questions in a question bank so questions can be stored and reused systematically.

Group Questions by Science Subject

Keep biology, chemistry, physics, Earth science, environmental science, astronomy, and human-body questions in clearly labeled groups.

Add Difficulty Levels

Easy questions can test recognition of foundational facts. Medium questions can challenge common misconceptions, while harder questions can require students to connect several scientific ideas.

Tag Questions by Learning Objective

A question about photosynthesis and a question about plant anatomy may both belong to biology, but they assess different objectives. More specific tags make future quiz creation faster.

Add Math and History to a Multi-Subject Learning Quiz

Science does not have to be the only subject in a review game. For a broader classroom challenge, alternate science rounds with other academic topics.

Add math true or false questions with answers when you want students to evaluate equations, number properties, geometry, fractions, and other mathematical statements.

You can also include history true or false questions with answers for a mixed academic game covering scientific reasoning, mathematics, and historical knowledge.

How to Build a Balanced 20-Question Science Quiz

You do not need all 120 questions for one lesson. A balanced 20-question science review can include:

• 3 General Science Questions
• 3 Biology Questions
• 3 Human Body Questions
• 3 Earth Science Questions
• 3 Physics Questions
• 3 Chemistry Questions
• 2 Space or Hard Science Questions

For a focused lesson, replace the mixed structure with more questions from the science topic students are currently studying.

How to Write Better True or False Science Questions

Test One Scientific Idea at a Time

A statement containing two different claims can become difficult to score. Keep each question centered on one fact, relationship, or misconception.

Use Scientifically Precise Language

Small wording differences can change whether a science statement is correct. Specify the conditions when temperature, pressure, location, or biological variation matters.

Target Common Misconceptions

Statements such as “bats are blind,” “blood in veins is blue,” or “Mercury is the hottest planet” work well because the correction addresses a familiar misunderstanding.

Explain Why False Answers Are False

The corrected explanation is often the most educational part of the question. Keep it short enough to maintain the pace while still stating the accurate concept.

Avoid Accidental Answer Patterns

Review the final sequence before publishing. Too many True or False answers in a row can encourage pattern guessing rather than scientific reasoning.

Match Difficulty to the Learner

A statement about planets may be easy for one age group and challenging for another. Difficulty should reflect the students' prior learning rather than the topic alone.

Ready to Start a Science True or False Quiz?

These 120 true false science questions with answers provide an easy-to-hard collection for classroom warm-ups, homework, science review, team competitions, and formative assessment.

Choose the subjects that match your lesson, explain the scientific reasoning behind difficult answers, and use NineQuiz when you are ready to bring the science activity online.