Super Science Quiz for Kids: Fun Facts & Cool Questions!

Bright, bite-size science quiz for curious kids (6+). Explore animals, space, plants, and simple experiments—learn while having fun!

  1. What gas do people breathe out?
    1. Nitrogen
    2. Oxygen
    3. Carbon dioxide
    4. Hydrogen
  2. Which of the following is a planet in our solar system?
    1. Ceres
    2. Europa
    3. Mars
    4. Titan
  3. Why do we wear helmets when biking?
    1. To improve balance
    2. To protect the head
    3. To increase cycling speed
    4. To keep hair neat
  4. Who is known for the theory of gravity after seeing an apple?
    1. Isaac Newton
    2. Albert Einstein
    3. Galileo Galilei
    4. Johannes Kepler
  5. What do plants make from sunlight?
    1. Oxygen only
    2. Glucose
    3. Protein
    4. Minerals
  6. Which tool helps us see tiny cells?
    1. Telescope
    2. Microscope
    3. Stethoscope
    4. Thermometer
  7. How does ice change when it gets warm?
    1. Becomes a different mineral
    2. Becomes colder
    3. Turns into steam
    4. Melts into water
  8. Which movie has a friendly robot named WALL·E?
    1. The Iron Giant
    2. WALL·E
    3. Big Hero 6
    4. RoboCop

Answers and explanations

  1. Question: What gas do people breathe out?
    Answer: Carbon dioxide
    Explanation: When we exhale, our bodies release carbon dioxide (CO2), a waste product of cellular respiration that occurs as cells convert glucose and oxygen into energy. CO2 is important because its levels in the blood help regulate breathing rate and maintain the body's acid–base balance.
  2. Question: Which of the following is a planet in our solar system?
    Answer: Mars
    Explanation: Mars is the fourth planet from the Sun, known for its red color caused by iron oxide on its surface. It's a major focus of planetary science and exploration because of its potential for past water and—possibly—habitability, making it key to understanding planetary evolution and the search for life.
  3. Question: Why do we wear helmets when biking?
    Answer: To protect the head
    Explanation: Helmets absorb and distribute impact energy to reduce head injuries in crashes or falls. Wearing one significantly lowers the risk of traumatic brain injury and can be lifesaving—studies show helmets reduce serious head injury by about 60–70%.
  4. Question: Who is known for the theory of gravity after seeing an apple?
    Answer: Isaac Newton
    Explanation: Sir Isaac Newton is credited with formulating the law of universal gravitation after the famous anecdote of an apple falling from a tree; his work unified celestial and terrestrial motion and laid foundations for classical physics. Interesting fact: Newton also made major contributions to optics and
  5. Question: What do plants make from sunlight?
    Answer: Glucose
    Explanation: Plants use sunlight to power photosynthesis, converting carbon dioxide and water into glucose — a sugar that supplies energy and building material for growth. Fun fact: photosynthesis also releases oxygen, which transformed Earth’s atmosphere and enabled animal life.
  6. Question: Which tool helps us see tiny cells?
    Answer: Microscope
    Explanation: A microscope magnifies tiny structures like cells so we can see details invisible to the naked eye. It unlocked discoveries in biology and medicine — for example, microscopes led to the cell theory, which is foundational to all life sciences.
  7. Question: How does ice change when it gets warm?
    Answer: Melts into water
    Explanation: When ice gets warm it absorbs heat and changes from solid to liquid — a process called melting. This phase change is important in Earth's water cycle and affects weather, sea levels, and everyday things like ice cubes in drinks.
  8. Question: Which movie has a friendly robot named WALL·E?
    Answer: WALL·E
    Explanation: WALL·E is the 2008 Pixar animated film about a lonely, trash-compacting robot who shows curiosity, emotion, and love while cleaning an abandoned Earth. It's notable for telling much of its early story with almost no dialogue and for its commentary on consumerism and environmental stewardship.