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Science Trivia Questions

52 science questions, from ★ easy to ★★★★★ hard. Tap Show answer for the answer and source.

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  1. How many planets are in our Solar System? ★
    • 7
    • 9
    • 10
    • 8
    Show answer

    8 — The Solar System has eight planets. Source: Wikipedia 'Solar System'

  2. At what temperature does water freeze? ★
    • 10 °C
    • 50 °C
    • 100 °C
    • 0 °C
    Show answer

    0 °C — Water freezes at 0 °C (32 °F). Source: Wikipedia 'Water'

  3. What part of the body does the skull protect? ★
    • The lungs
    • The stomach
    • The heart
    • The brain
    Show answer

    The brain — The skull protects the brain. Source: Wikipedia 'Human skeleton'

  4. In a storm, why do we see lightning before we hear thunder? ★
    • Sound is faster than light
    • Ears work slower in rain
    • Clouds block the sound
    • Light is faster than sound
    Show answer

    Light is faster than sound — Light travels much faster than sound, so thunder arrives later. Source: Wikipedia 'Thunder'

  5. About how long does Earth take to spin once? ★
    • 1 hour
    • 7 days
    • 365 days
    • 24 hours
    Show answer

    24 hours — Earth turns once about every 24 hours, giving day and night. Source: Wikipedia 'Earth's rotation'

  6. The Moon makes its own light, just like the Sun. ★
    • True
    • False
    Show answer

    False — Moonlight is mostly sunlight reflected off the Moon's surface. Source: Wikipedia 'Moonlight'

  7. What is the largest planet in the Solar System? ★★
    • Saturn
    • Earth
    • Neptune
    • Jupiter
    Show answer

    Jupiter — Jupiter is the biggest planet, with a radius of about 71,000 km. Source: Wikipedia 'Solar System'

  8. Which planet is closest to the Sun? ★★
    • Mars
    • Earth
    • Venus
    • Mercury
    Show answer

    Mercury — Mercury is the innermost planet of the Solar System. Source: Wikipedia 'Solar System'

  9. Which planet is known as the "Red Planet"? ★★
    • Venus
    • Jupiter
    • Mercury
    • Mars
    Show answer

    Mars — Mars looks red because of iron oxide (rust) in its soil. Source: Wikipedia 'Mars'

  10. Which gas do plants release during photosynthesis? ★★
    • Nitrogen
    • Helium
    • Carbon dioxide
    • Oxygen
    Show answer

    Oxygen — Photosynthesis splits water and releases oxygen as a by-product. Source: Wikipedia 'Photosynthesis'

  11. What is the green pigment that plants use to absorb light? ★★
    • Melanin
    • Hemoglobin
    • Keratin
    • Chlorophyll
    Show answer

    Chlorophyll — Chlorophyll absorbs light for photosynthesis and reflects green light. Source: Wikipedia 'Photosynthesis'

  12. At sea level, at what temperature does water boil? ★★
    • 80 °C
    • 120 °C
    • 50 °C
    • 100 °C
    Show answer

    100 °C — At standard pressure water boils at about 100 °C (212 °F). Source: Wikipedia 'Properties of water'

  13. A water molecule has two hydrogen atoms and one atom of what? ★★
    • Nitrogen
    • Sodium
    • Carbon
    • Oxygen
    Show answer

    Oxygen — Water is H2O: two hydrogen atoms bonded to one oxygen atom. Source: Wikipedia 'Properties of water'

  14. What is the main cause of Earth's ocean tides? ★★
    • Strong winds
    • Underwater volcanoes
    • Heat from the core
    • The Moon's gravity
    Show answer

    The Moon's gravity — The Moon's tidal pull is the main driver of Earth's tides. Source: Wikipedia 'Moon'

  15. The Sun is a star. ★★
    • True
    • False
    Show answer

    True — The Sun is the star at the centre of our Solar System. Source: Wikipedia 'Solar System'

  16. Mercury is the hottest planet in the Solar System. ★★
    • True
    • False
    Show answer

    False — Venus is the hottest planet because its thick atmosphere traps heat. Source: Wikipedia 'Venus'

  17. Sound travels faster in water than in air. ★★
    • True
    • False
    Show answer

    True — Sound moves about 1,480 m/s in water but only about 343 m/s in air. Source: Wikipedia 'Speed of sound'

  18. Copper is strongly attracted to magnets. ★★
    • True
    • False
    Show answer

    False — Copper is not magnetic like iron; it is actually very weakly repelled by magnets. Source: Wikipedia 'Magnet'

  19. Ice floats because it is less dense than liquid water. ★★
    • True
    • False
    Show answer

    True — Water becomes about 9% less dense when it freezes, so ice floats. Source: Wikipedia 'Properties of water'

  20. Which part of a cell is nicknamed the "powerhouse of the cell"? ★★★
    • Ribosome
    • Cell membrane
    • Nucleus
    • Mitochondrion
    Show answer

    Mitochondrion — Mitochondria make ATP, the cell's main energy carrier. Source: Wikipedia 'Mitochondrion'

  21. Which particle in an atom has no electric charge? ★★★
    • Proton
    • Ion
    • Electron
    • Neutron
    Show answer

    Neutron — Protons are positive, electrons are negative and neutrons are neutral. Source: Wikipedia 'Atom'

  22. Diamond is a form of which element? ★★★
    • Nitrogen
    • Sulfur
    • Silicon
    • Carbon
    Show answer

    Carbon — Diamond is carbon with its atoms arranged in a very strong crystal structure. Source: Wikipedia 'Diamond'

  23. Which planet is the hottest in the Solar System? ★★★
    • Mercury
    • Mars
    • Jupiter
    • Venus
    Show answer

    Venus — Venus's thick carbon dioxide atmosphere traps heat, making it hotter than Mercury. Source: Wikipedia 'Venus'

  24. What gives Mars its reddish color? ★★★
    • Red algae
    • Copper dust
    • Hot lava
    • Iron oxide (rust)
    Show answer

    Iron oxide (rust) — Iron oxide minerals on its surface make Mars look red. Source: Wikipedia 'Mars'

  25. What is the chemical symbol for sodium? ★★★
    • Sd
    • S
    • So
    • Na
    Show answer

    Na — Na comes from "natrium", the element's Latin name. Source: Wikipedia 'Sodium'

  26. Which gas makes up most of Earth's atmosphere? ★★★
    • Oxygen
    • Argon
    • Carbon dioxide
    • Nitrogen
    Show answer

    Nitrogen — Air is about 78% nitrogen and 21% oxygen. Source: Wikipedia 'Atmosphere of Earth'

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  1. Which of Newton's laws says every action has an equal and opposite reaction? ★★★
    • The second law
    • The law of gravity
    • The first law
    • The third law
    Show answer

    The third law — Newton's third law: forces between two bodies are equal and opposite. Source: Wikipedia 'Newton's laws of motion'

  2. Sound can travel through the vacuum of space. ★★★
    • True
    • False
    Show answer

    False — Sound needs a medium such as air or water, so it cannot travel through a vacuum. Source: Wikipedia 'Sound'

  3. Chlorophyll absorbs green light more strongly than any other color. ★★★
    • True
    • False
    Show answer

    False — Chlorophyll absorbs mostly blue and red light and reflects green, which is why plants look green. Source: Wikipedia 'Chlorophyll'

  4. Electrons are found inside the nucleus of an atom. ★★★
    • True
    • False
    Show answer

    False — The nucleus holds protons and neutrons; electrons surround it. Source: Wikipedia 'Atom'

  5. Mercury is the closest planet to the Sun. ★★★
    • True
    • False
    Show answer

    True — Mercury is the first planet from the Sun and the smallest in the Solar System. Source: Wikipedia 'Mercury (planet)'

  6. Water boils at a lower temperature high up in the mountains than at sea level. ★★★
    • True
    • False
    Show answer

    True — Lower air pressure at high altitude lowers the boiling point of water. Source: Wikipedia 'Boiling point'

  7. Which noble gas is the most abundant in Earth's atmosphere? ★★★★
    • Neon
    • Helium
    • Krypton
    • Argon
    Show answer

    Argon — Argon makes up about 0.94% of the atmosphere by volume. Source: Wikipedia 'Noble gas'

  8. Which element has the chemical symbol W? ★★★★
    • Tin
    • Titanium
    • Vanadium
    • Tungsten
    Show answer

    Tungsten — W comes from "wolfram", tungsten's other name. Source: Wikipedia 'Tungsten'

  9. Absolute zero (0 kelvin) equals which temperature in Celsius? ★★★★
    • −100 °C
    • −173.15 °C
    • −459.67 °C
    • −273.15 °C
    Show answer

    −273.15 °C — The Kelvin scale starts at absolute zero, which is −273.15 °C. Source: Wikipedia 'Absolute zero'

  10. Which planet has the shortest day, rotating in under 10 hours? ★★★★
    • Mercury
    • Earth
    • Mars
    • Jupiter
    Show answer

    Jupiter — Jupiter spins faster than any other planet, once in about 9 hours 55 minutes. Source: Wikipedia 'Jupiter'

  11. Which planet takes longer to spin once on its axis than to orbit the Sun? ★★★★
    • Jupiter
    • Mars
    • Neptune
    • Venus
    Show answer

    Venus — Venus takes about 243 Earth days to spin once but only about 225 days to orbit the Sun. Source: Wikipedia 'Venus'

  12. The coulomb is the SI unit of what? ★★★★
    • Electric current
    • Voltage
    • Resistance
    • Electric charge
    Show answer

    Electric charge — The coulomb (C) is the SI unit of electric charge. Source: Wikipedia 'Coulomb'

  13. Phobos and Deimos are moons of which planet? ★★★★
    • Saturn
    • Neptune
    • Jupiter
    • Mars
    Show answer

    Mars — Mars has two small, irregular moons: Phobos and Deimos. Source: Wikipedia 'Mars'

  14. Roughly how many particles are in one mole of a substance? ★★★★
    • 6.02 × 10¹²
    • 1.60 × 10¹⁹
    • 3.14 × 10²³
    • 6.02 × 10²³
    Show answer

    6.02 × 10²³ — The Avogadro constant is exactly 6.02214076 × 10²³ per mole. Source: Wikipedia 'Avogadro constant'

  15. Which part of the brain is mainly known for coordinating balance and movement? ★★★★
    • Hypothalamus
    • Hippocampus
    • Thalamus
    • Cerebellum
    Show answer

    Cerebellum — The cerebellum fine-tunes motor coordination and helps keep balance. Source: Wikipedia 'Cerebellum'

  16. Helium has the lowest boiling point of all the elements. ★★★★
    • True
    • False
    Show answer

    True — Helium boils at about −269 °C (4.2 K), the lowest boiling point of any element. Source: Wikipedia 'Helium'

  17. Mitochondria have their own DNA, separate from the cell nucleus. ★★★★
    • True
    • False
    Show answer

    True — Mitochondria carry a small circular genome of their own, similar to bacterial DNA. Source: Wikipedia 'Mitochondrion'

  18. Mature human red blood cells have a nucleus. ★★★★
    • True
    • False
    Show answer

    False — Mature mammalian red blood cells lose their nucleus to make room for hemoglobin. Source: Wikipedia 'Red blood cell'

  19. Which particle carries the electromagnetic force? ★★★★★
    • Neutrino
    • Graviton
    • Gluon
    • Photon
    Show answer

    Photon — The photon is the force carrier (gauge boson) of electromagnetism. Source: Wikipedia 'Photon'

  20. Triton, a large moon with a backward (retrograde) orbit, circles which planet? ★★★★★
    • Uranus
    • Saturn
    • Jupiter
    • Neptune
    Show answer

    Neptune — Triton is Neptune's largest moon and the only large moon with a retrograde orbit. Source: Wikipedia 'Triton (moon)'

  21. Who discovered the neutron in 1932? ★★★★★
    • Ernest Rutherford
    • J. J. Thomson
    • Niels Bohr
    • James Chadwick
    Show answer

    James Chadwick — Chadwick discovered the neutron in 1932 and won the 1935 Nobel Prize in Physics. Source: Wikipedia 'James Chadwick'

  22. On the Mohs hardness scale, which mineral is rated 9, just below diamond? ★★★★★
    • Topaz
    • Quartz
    • Fluorite
    • Corundum
    Show answer

    Corundum — The Mohs scale puts topaz at 8, corundum at 9 and diamond at 10. Source: Wikipedia 'Mohs scale'

  23. The tesla is the SI unit of what? ★★★★★
    • Electric charge
    • Inductance
    • Capacitance
    • Magnetic flux density
    Show answer

    Magnetic flux density — The tesla (T) measures magnetic flux density, the B-field. Source: Wikipedia 'Tesla (unit)'

  24. Venus spins on its axis in the opposite direction to most planets, including Earth. ★★★★★
    • True
    • False
    Show answer

    True — Venus has retrograde rotation, turning clockwise as seen from above its north pole. Source: Wikipedia 'Venus'

  25. The siemens is the SI unit of electrical resistance. ★★★★★
    • True
    • False
    Show answer

    False — Resistance is measured in ohms; the siemens measures conductance, the reciprocal of resistance. Source: Wikipedia 'Ohm'

  26. Oxygen is the most abundant element in Earth's crust by mass. ★★★★★
    • True
    • False
    Show answer

    True — Oxygen makes up almost half of Earth's crust by mass, mostly in oxides such as silicates. Source: Wikipedia 'Oxygen'