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51 questions · Updated July 2026

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  1. 1. Which element has the chemical symbol 'O'?

    1. Osmium
    2. Osmium
    3. Oxygen
    4. Oganesson
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    Correct answer: Oxygen

    Explanation: Oxygen has the chemical symbol 'O'.

  2. 2. Would you rather be a famous actor or a successful scientist?

    1. Successful Scientist
    2. Famous Actor

  3. 3. What do we call water when it freezes and becomes hard?

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    Answer: Ice

    Explanation: When water gets very cold, it freezes into ice. Ice melts back into water when it warms up again.

  4. 4. Which planet is known as the Red Planet?

    1. Saturn
    2. Jupiter
    3. Mars
    4. Venus
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    Correct answer: Mars

    Explanation: Mars is called the Red Planet due to its reddish appearance.

  5. 5. What is the hardest natural substance on Earth?

    1. Granite
    2. Iron
    3. Diamond
    4. Steel
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    Correct answer: Diamond

    Explanation: Diamond is the hardest natural substance on Earth.

  6. 6. What is the chemical symbol for water?

    1. CO2
    2. H2O
    3. NaCl
    4. O2
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    Correct answer: H2O

    Explanation: H2O is the chemical formula for water.

  7. 7. What is the largest planet in our solar system?

    1. Saturn
    2. Neptune
    3. Uranus
    4. Jupiter
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    Correct answer: Jupiter

    Explanation: Jupiter is the largest planet in our solar system.

  8. 8. What is the closest planet to the Sun?

    1. Mars
    2. Venus
    3. Earth
    4. Mercury
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    Correct answer: Mercury

    Explanation: Mercury is the closest planet to the Sun.

  9. 9. Who was the first person to observe sunspots?

    1. Newton
    2. Kepler
    3. Copernicus
    4. Galileo
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    Correct answer: Galileo

    Explanation: Galileo was the first to observe and document sunspots in the early 17th century, providing evidence that the sun is not a flawless sphere, as previously thought.

  10. 10. The classic Valentine's heart symbol closely matches the anatomical shape of a real human heart.

    1. True
    2. False
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    Correct answer: False

    Explanation: False. A real human heart looks more like a lopsided fist than the symmetrical Valentine symbol. Historians have variously traced the symbol's shape to medieval art, ivy leaves, and even the seed of the ancient silphium plant.

  11. 11. Every place on Earth enters the new year at exactly the same moment.

    1. True
    2. False
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    Correct answer: False

    Explanation: False. Because of time zones, the new year arrives at different moments around the globe, rolling westward over roughly 26 hours from the earliest zones in the Pacific to the very last islands to celebrate.

  12. 12. Which gas do plants primarily take in from the air to perform photosynthesis?

    1. Carbon dioxide
    2. Oxygen
    3. Nitrogen
    4. Hydrogen
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    Correct answer: Carbon dioxide

    Explanation: Plants absorb carbon dioxide and use light energy to convert it into sugars during photosynthesis, releasing oxygen as a byproduct.

  13. 13. What is the chemical formula for water?

    1. H2
    2. O2
    3. H2O
    4. HO2
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    Correct answer: H2O

    Explanation: Water is composed of two hydrogen atoms bonded to one oxygen atom, giving the formula H2O.

  14. 14. What is the chemical symbol for gold?

    1. Fe
    2. Au
    3. Cu
    4. Ag
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    Correct answer: Au

    Explanation: Au comes from the Latin word 'Aurum' which means gold.

  15. 15. What is the study of fossils called?

    1. Paleontology
    2. Geology
    3. Biology
    4. Archaeology
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    Correct answer: Paleontology

    Explanation: Paleontology is the scientific study of fossils.

  16. 16. Who was the first woman to win a Nobel Prize?

    1. Jane Goodall
    2. Rosalind Franklin
    3. Dorothy Hodgkin
    4. Marie Curie
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    Correct answer: Marie Curie

    Explanation: Marie Curie was the first woman to win a Nobel Prize in 1903.

  17. 17. The term "light-year" refers to:

    1. A measure of distance
    2. A measure of brightness
    3. A measure of time
    4. The speed of light
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    Correct answer: A measure of distance

    Explanation: A light-year is a unit of distance, representing how far light travels in one year (about 9.46 trillion km).

  18. 18. What is the maximum number on the pH scale?

    1. 12
    2. 10
    3. 7
    4. 14
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    Correct answer: 14

    Explanation: The highest value on the pH scale is 14, indicating a highly basic solution. The lower the number the acidic the solution is.

  19. 19. Which inventor developed over 300 products from peanuts and revolutionized Southern agriculture?

    1. George Washington Carver
    2. Lewis Latimer
    3. Granville Woods
    4. Garrett Morgan
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    Correct answer: George Washington Carver

    Explanation: George Washington Carver, born into slavery, became a renowned scientist at Tuskegee Institute. His crop rotation methods and peanut products helped Southern farmers move beyond cotton dependency.

  20. 20. What order do the asteroidea belong to?

    1. Jellyfish
    2. Corals
    3. Sea urchins
    4. Starfish
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    Correct answer: Starfish

    Explanation: Asteroidea is the scientific class name for starfish, which are known for their unique radial symmetry and regeneration capabilities.

  21. 21. A meteorologist is a scientist who studies meteors.

    1. True
    2. False
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    Correct answer: False

    Explanation: False. A meteorologist studies the atmosphere and weather. Despite the name, meteors are studied by astronomers; the mix-up comes from the Greek "meteoros", meaning "high in the air".

  22. 22. True or False: Water vapor in the air can cool and form tiny droplets that make clouds.

    1. True
    2. False
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    Correct answer: True

    Explanation: When warm air with water vapor cools, the vapor condenses into small liquid droplets or ice crystals that appear as clouds.

  23. 23. Which gas makes up the largest proportion of Earth's atmosphere by volume?

    1. Carbon dioxide
    2. Nitrogen
    3. Argon
    4. Oxygen
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    Correct answer: Nitrogen

    Explanation: Nitrogen accounts for about 78 percent of Earth's atmosphere by volume, with oxygen around 21 percent.

  24. 24. Which element has the atomic number 1?

    1. Helium
    2. Hydrogen
    3. Lithium
    4. Carbon
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    Correct answer: Hydrogen

    Explanation: Hydrogen has the atomic number 1.

  25. 25. The first artificial satellite launched into space was ______, by the Soviet Union in 1957.

    1. Vanguard 2
    2. Apollo 1
    3. Sputnik 1
    4. Sputnik 2
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    Correct answer: Sputnik 1

    Explanation: Sputnik 1 was launched in October 1957, marking the start of the space age.

  26. 26. Which items were included on the Voyager Golden Record?

    1. Blueprints of the vehicle
    2. Music
    3. Photos
    4. DNA diagram
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    Correct answers: Music, Photos, DNA diagram

    Explanation: The Golden Record includes music, greetings, and scientific information, but not Voyager’s blueprints.

  27. 27. Voyager 2 has already left the Solar System and entered interstellar space.

    1. True
    2. False
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    Correct answer: True

    Explanation: Voyager 2 entered interstellar space on November 5, 2018, making it the second human-made object to leave the Sun's protective bubble, known as the heliosphere.

  28. 28. French astronomers discovered the lightest noble gas while observing a solar eclipse in 1868. What's the name of that gas?

    1. Fart
    2. Argon
    3. Methane
    4. Helium
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    Correct answer: Helium

    Explanation: Helium is the lightest noble gas and was first identified during a solar eclipse; it actually gets its name from the Greek word 'helios,' meaning sun.

  29. 29. What causes day and night on Earth?

    1. Earth rotating on its axis
    2. The Moon blocking the Sun
    3. The Sun turning on and off
    4. Earth orbiting the Sun
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    Correct answer: Earth rotating on its axis

    Explanation: Day and night occur because Earth spins once on its axis about every 24 hours, so different parts face the Sun or face away.

  30. 30. Which part of a plant takes in water and nutrients from the soil?

    1. Leaves
    2. Roots
    3. Stem
    4. Flower
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    Correct answer: Roots

    Explanation: Roots grow into the soil to absorb water and minerals and to anchor the plant in place.

  31. 31. What year did the United States land the first humans on the Moon?

    1. 1969
    2. 1972
    3. 1961
    4. 1965
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    Correct answer: 1969

    Explanation: The United States landed the first humans on the Moon on July 20, 1969, during the Apollo 11 mission.

  32. 32. Launched in 2021, the ______ Space Telescope is designed to study the universe in infrared wavelengths and has honeycomb-like mirrors.

    1. Spitzer
    2. Hubble
    3. James Webb
    4. Kepler
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    Correct answer: Hubble

    Explanation: The James Webb Space Telescope observes the universe primarily in infrared, succeeding Hubble in many areas.

  33. 33. Which planet could theoretically float in water?

    1. Neptune
    2. Jupiter
    3. Saturn
    4. Mars
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    Correct answer: Saturn

    Explanation: Saturn's density is only 0.687 g/cm³, less than water's 1 g/cm³, so it would float! Of course, you'd need an impossibly large ocean, and Saturn would eventually dissolve, but theoretically it works!

  34. 34. The Montserrat Volcano Observatory (MVO) was established in 1995 to monitor volcanic activity.

    1. False
    2. True
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    Correct answer: True

    Explanation: True. The MVO was established shortly after the eruption began to provide continuous monitoring and scientific analysis of the Soufrière Hills volcano.

  35. 35. Which hormone, released during hugging and bonding, is often nicknamed the "love hormone"?

    1. Adrenaline
    2. Insulin
    3. Oxytocin
    4. Melatonin
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    Correct answer: Oxytocin

    Explanation: Oxytocin is released during physical touch, childbirth, and bonding moments, earning it the nickname "love hormone" or "cuddle chemical".

  36. 36. Turkey contains far more tryptophan than other common meats, which is why it uniquely makes you sleepy after Thanksgiving dinner.

    1. False
    2. True
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    Correct answer: False

    Explanation: False. Turkey's tryptophan content is comparable to chicken and other meats. Post-feast drowsiness is mostly caused by simply eating a very large, carbohydrate-heavy meal, often washed down with alcohol.

  37. 37. Which gas makes up the largest portion of Earth's atmosphere by volume?

    1. Oxygen
    2. Argon
    3. Nitrogen
    4. Carbon dioxide
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    Correct answer: Nitrogen

    Explanation: About 78 percent of Earth's atmosphere is nitrogen, while oxygen is about 21 percent.

  38. 38. What is the name of the process by which green plants use sunlight to produce sugars?

    1. Fermentation
    2. Respiration
    3. Decomposition
    4. Photosynthesis
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    Correct answer: Photosynthesis

    Explanation: Photosynthesis uses light energy, carbon dioxide, and water to make sugars and oxygen in plants.

  39. 39. What metal impurity makes rubies red and emeralds green, and is added to iron to make steel resistant to corrosion?

    1. Copper
    2. Iron
    3. Chromium
    4. Nickel
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    Correct answer: Chromium

    Explanation: Chromium is the key element that gives rubies and emeralds their vibrant colors and also enhances steel's resistance to rust.

  40. 40. What’s the name of the Sun’s protective bubble that surrounds our solar system?

    1. Asteroid Belt
    2. Exosphere
    3. Heliosphere
    4. Oort Cloud
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    Correct answer: Heliosphere

    Explanation: The solar wind of our sun creates a protective bubble that surrounds our solar system, called the heliosphere.

  41. 41. Which of these Nobel Prizes were won by Japanese scientists?

    1. Chemistry
    2. Peace
    3. Literature
    4. Medicine
    5. Physics
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    Correct answers: Chemistry, Peace, Literature, Medicine, Physics

    Explanation: Japan has won Nobel Prizes in all categories: Physics (multiple), Chemistry (multiple), Medicine (multiple), Literature (Kawabata, Oe), and Peace (Sato).

  42. 42. The word 'laser' started life as an acronym. What does it stand for?

    1. Light Actuated System for Energy Redirection
    2. Linear Amplification of Standard Emitted Radiowaves
    3. Light Amplification by Stimulated Emission of Radiation
    4. Luminous Array of Synchronized Electromagnetic Rays
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    Correct answer: Light Amplification by Stimulated Emission of Radiation

    Explanation: Laser stands for Light Amplification by Stimulated Emission of Radiation, coined in the late 1950s. Like 'scuba' and 'radar', it became so common that we stopped writing it in capitals.

  43. 43. Scientists agree that wild snakes never actually lived in Ireland after the last Ice Age.

    1. False
    2. True
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    Correct answer: True

    Explanation: True. Fossil records show no native snakes in post-glacial Ireland; the surrounding cold seas kept them from ever recolonizing the island. So St. Patrick's legendary snake-banishing had no actual snakes to banish.

  44. 44. Which element is represented by the chemical symbol Fe?

    1. Francium
    2. Fluorine
    3. Iron
    4. Fermium
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    Correct answer: Iron

    Explanation: The symbol Fe comes from the Latin name ferrum, which means iron.

  45. 45. True or False: Sound travels faster in water than in air.

    1. True
    2. False
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    Correct answer: True

    Explanation: Sound moves faster in water because particles are closer together, allowing vibrations to transfer more quickly.

  46. 46. Which of these common gases has the lowest boiling point at standard pressure?

    1. Argon
    2. Helium
    3. Nitrogen
    4. Oxygen
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    Correct answer: Helium

    Explanation: Helium has the lowest boiling point among these at about −269 °C (4 K), lower than nitrogen, oxygen, or argon.

  47. 47. Which was the first planet visited by Voyager 2 after launch?

    1. Jupiter
    2. Saturn
    3. Neptune
    4. Uranus
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    Correct answer: Jupiter

    Explanation: After launching on August 20, 1977, the first planet Voyager 2 visited was Jupiter. It arrived at Jupiter in July 1979, followed by a flyby of Saturn in August 1981, then Uranus in January 1986, and finally Neptune in August 1989.

  48. 48. When was NASA’s Voyager 2 spacecraft launched?

    1. 1985
    2. 1973
    3. 1977
    4. 1981
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    Correct answer: 1977

    Explanation: Voyager 2 was launched on August 20, 1977, about two weeks before its twin, Voyager 1.

  49. 49. Which of these inventions were created by Irish people?

    1. The ejector seat
    2. Color photography
    3. The seismograph
    4. The submarine
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    Correct answers: The ejector seat, Color photography, The seismograph, The submarine

    Explanation: All were Irish inventions! John Philip Holland (submarine), Robert Mallet (seismograph), John Joly (color photography), and James Martin (ejector seat) were all Irish inventors.

  50. 50. True or False: A neutrino carries no electric charge and can pass through the entire Earth with very little chance of interacting.

    1. False
    2. True
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    Correct answer: True

    Explanation: Neutrinos are electrically neutral and interact only via the weak nuclear force and gravity, so most pass through matter, including Earth, without interacting.

  51. 51. Which element is named after the chemist who developed the periodic table?

    1. Curium
    2. Einsteinium
    3. Rutherfordium
    4. Mendelevium
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    Correct answer: Mendelevium

    Explanation: Mendelevium (Md, atomic number 101) is named for Dmitri Mendeleev, who organised the periodic arrangement of the elements.

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