100 best science trivia questions and answers

Trivia questions are a fun pastime and a fantastic way to learn and engage with science. Whether you’re curious about the mysteries of space, the complexities of the human body, or the wonders of nature, trivia can make learning science interactive and enjoyable. From hosting quiz nights to creating online assignments, science trivia questions can spark curiosity and foster a deeper understanding of scientific concepts. 

Ready to challenge your knowledge? Let’s dive into some fascinating science trivia questions and answers!

Easy science trivia questions

1. What planet is the hottest in our solar system?
   Answer: Venus
2. What is the center of an atom called?
   Answer: Nucleus
3. What is the main gas that humans exhale?
   Answer: Carbon dioxide
4. What organ do humans use to breathe?
   Answer: Lungs
5. How many planets are in our solar system?
   Answer: 8
6. What do you call an animal that eats only plants?
   Answer: Herbivore
7. What part of the human body contains the most bones?
   Answer: Hands
8. What is the largest land animal?
   Answer: African elephant
9. What star is closest to Earth?
   Answer: The Sun
10. What is the only metal that is liquid at room temperature?
    Answer: Mercury
11. What is the process of water turning into vapor called?
    Answer: Evaporation
12. What is the soft tissue inside bones that produces blood cells?
    Answer: Bone marrow
13. What is the largest internal organ inside the human body?
    Answer: Liver
14. What is the chemical symbol for oxygen?
    Answer: O
15. What force keeps us on the ground and stops us from floating into space?
    Answer: Gravity
16. What do you call a scientist who studies rocks?
    Answer: Geologist
17. How many hearts does an octopus have?
    Answer: 3
18. What gas do humans need to breathe to survive?
    Answer: Oxygen
19. What is the smallest particle of an element called?
    Answer: Atom
20. What planet is famous for its beautiful rings?
    Answer: Saturn

Biology trivia questions

1. What is the basic unit of life?
   Answer: Cell
2. What is the process by which plants convert sunlight into energy?
   Answer: Photosynthesis
3. What organelle is known as the powerhouse of the cell?
   Answer: Mitochondria
4. What part of the human body is primarily responsible for filtering blood?
   Answer: Kidneys
5. What is the largest organ in the human body?
   Answer: Skin
6. What type of blood cells help fight infections?
   Answer: White blood cells
7. What is the name of the structure in plant cells that provides support and rigidity?
   Answer: Cell wall
8. What molecule carries genetic information in most living organisms?
   Answer: DNA
9. What is the process of cell division in somatic cells called?
   Answer: Mitosis
10. What types of animals are warm-blooded and have hair or fur?
    Answer: Mammals
11. Which organ in the human body produces insulin?
    Answer: Pancreas
12. What is the term for a group of ecosystems with similar climates and organisms?
    Answer: Biome
13. What is the smallest bone in the human body?
    Answer: Stapes (in the ear)
14. What is the scientific name for the study of animals?
    Answer: Zoology
15. Which organ in the human body is responsible for producing bile?
    Answer: Liver
16. What is the primary pigment in plants that captures sunlight for photosynthesis?
    Answer: Chlorophyll
17. What type of symmetry do humans have?
    Answer: Bilateral symmetry
18. What is the primary function of red blood cells?
    Answer: To transport oxygen
19. What is the term for organisms that can make their food?
    Answer: Autotrophs
20. What is the process by which an organism’s traits are passed to its offspring?
    Answer: Heredity

Chemistry trivia questions

1. What is the chemical symbol for silver?
   Answer: Ag
2. What is the most abundant gas in the Earth’s atmosphere?
   Answer: Nitrogen
3. What is the pH of a neutral solution?
   Answer: 7
4. What is the lightest element on the periodic table?
   Answer: Hydrogen
5. What is the name of the chemical process by which iron rusts?
   Answer: Oxidation
6. What is the common name for dihydrogen monoxide?
   Answer: Water
7. Which element is commonly used in balloons because it is lighter than air?
   Answer: Helium
8. What is the chemical formula for methane?
   Answer: CH₄
9. What type of bond forms between two water molecules?
   Answer: Hydrogen bond
10. What is the atomic number of carbon?
    Answer: 6
11. Which acid is found in vinegar?
    Answer: Acetic acid
12. What is the element’s name with the chemical symbol “K”?
    Answer: Potassium
13. What type of reaction absorbs heat?
    Answer: Endothermic reaction
14. What is the name of the chemical compound Na₂CO₃?
    Answer: Sodium carbonate
15. What element is used in thermometers and is toxic to humans?
    Answer: Mercury
16. Which element is commonly associated with the smell of rotten eggs?
    Answer: Sulfur
17. What are the vertical columns in the periodic table called?
    Answer: Groups
18. Which gas is released when an acid reacts with a carbonate?
    Answer: Carbon dioxide
19. What is the process by which a solid changes directly into a gas?
    Answer: Sublimation
20. What is the primary component of natural gas?
    Answer: Methane

Physics trivia questions

1. What force pulls objects toward the center of the Earth?
   Answer: Gravity
2. What is the speed of light in a vacuum?
   Answer: Approximately 299,792 kilometers per second (or 186,282 miles per second)
3. What is the unit of force in the International System of Units (SI)?
   Answer: Newton
4. What law states that “for every action, there is an equal and opposite reaction”?
   Answer: Newton’s Third Law of Motion
5. What type of energy is stored in a stretched or compressed spring?
   Answer: Elastic potential energy
6. What is the SI unit of power?
   Answer: Watt
7. What property of an object determines its resistance to changes in motion?
   Answer: Mass
8. Who developed the theory of general relativity?
   Answer: Albert Einstein
9. What is the term for bending light as it passes from one medium to another?
   Answer: Refraction
10. What is the name of the force that opposes the motion of an object through a fluid?
    Answer: Drag
11. What is the phenomenon called when light waves bend around obstacles or spread out after passing through a small opening?
    Answer: Diffraction
12. What measures the average kinetic energy of the particles in a substance?
    Answer: Temperature
13. What type of wave requires a medium to travel through?
    Answer: Mechanical wave
14. What is the SI unit of electric current?
    Answer: Ampere
15. What is the term for materials that do not allow electricity to flow easily?
    Answer: Insulators
16. What happens to the wavelength of light as its frequency increases?
    Answer: The wavelength decreases
17. What type of lens is thicker at the edges than in the center?
    Answer: Concave lens
18. What is the force that causes objects to move in a circular path?
    Answer: Centripetal force
19. What type of particle is found in the nucleus of an atom and has no electrical charge?
    Answer: Neutron
20. What is the phenomenon where sound frequency changes due to the motion of the source or observer?
    Answer: Doppler Effect

Challenging science trivia questions

1. What is the second most abundant element in the Earth’s crust?
   Answer: Silicon
2. What is the name of the scientist who first proposed the heliocentric model of the solar system?
   Answer: Nicolaus Copernicus
3. What is the term for the amount of energy required to remove an electron from an atom or ion?
   Answer: Ionization energy
4. What is the name of the process in which two atomic nuclei combine to form a heavier nucleus, releasing energy?
   Answer: Nuclear fusion
5. What is the chemical formula of the compound commonly known as laughing gas?
   Answer: N₂O (Nitrous Oxide)
6. What is the name of the effect that causes light to bend around massive objects, predicted by Einstein’s general relativity?
   Answer: Gravitational lensing
7. What principle explains why an airplane can generate lift and stay in the air?
   Answer: Bernoulli’s Principle
8. What is the rarest naturally occurring element on Earth?
   Answer: Astatine
9. What is the name of the phase transition from a gas directly to a solid?
   Answer: Deposition
10. Which type of quark is the heaviest?
    Answer: Top quark
11. What is the term for the process by which a cell engulfs a solid particle to form an internal compartment?
    Answer: Phagocytosis
12. What is the name of the largest known volcano in the solar system?
    Answer: Olympus Mons (on Mars)
13. What is the term for a protein that speeds up chemical reactions in living organisms?
    Answer: Enzyme
14. Which subatomic particle is responsible for the phenomenon of electricity?
    Answer: Electron
15. What is the SI unit of luminous intensity?
    Answer: Candela
16. What is the branch of physics that deals with the motion of objects at very high speeds, close to the speed of light?
    Answer: Relativistic mechanics
17. What is the name of the bond formed when atoms share electrons?
    Answer: Covalent bond
18. What element is present in all organic compounds?
    Answer: Carbon
19. What is the name of the hormone that regulates the sleep-wake cycle?
    Answer: Melatonin
20. What law states that the entropy of a closed system will never decrease over time?
    Answer: The Second Law of Thermodynamics

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Photo by Ron Lach