200+ Science Quiz Questions and Answers For Kids

Science is everywhere, in the clouds floating above us, in the food we eat, and even in the devices we use every day. One of the most exciting ways to spark curiosity in young minds is through science quiz questions that challenge them to think, wonder, and discover.

Whether you are a teacher looking for classroom activities, a parent planning a fun quiz night, or a student brushing up for a competition, this collection of 250+ questions is your go-to guide.

From the tiniest cells in our body to the vast expanse of the universe, every category here is packed with fascinating facts your child will love to learn. So, get ready to test your knowledge and have a blast with science!

Why Science Quizzes Are Important for Kids

Science quizzes are not just about testing knowledge. They help kids think, ask questions, and understand the world better. They improve memory, encourage logical thinking, and make learning interactive.

Kids also develop problem-solving skills and gain confidence when they answer questions correctly. Most importantly, quizzes turn learning into a fun activity rather than a boring task.

Also Read: 250+ General Knowledge Questions With Answers For Kids

1. Biology Quiz Questions

Biology is the study of living things, from the tiniest bacteria to the largest whale. These questions will help kids understand the wonderful world of plants, animals, and the human body.

Q1. What is the powerhouse of the cell?

Answer: Mitochondria

Q2. How many chambers does the human heart have?

Answer: Four

Q3. What is the process by which plants make their own food?

Answer: Photosynthesis

Q4. Which organ in the human body produces insulin?

Answer: Pancreas

Q5. What is the largest organ of the human body?

Answer: Skin

Q6. How many bones are in the adult human body?

Answer: 206

Q7. What do we call the study of insects?

Answer: Entomology

Q8. Which part of the plant absorbs water and nutrients from the soil?

Answer: Roots

Q9. What is the scientific name for the human species?

Answer: Homo sapiens

Q10. Which blood cells help fight infections?

Answer: White blood cells (leukocytes)

Q11. What is the basic unit of life?

Answer: The cell

Q12. What green pigment is found in plant leaves?

Answer: Chlorophyll

Q13. Which organ is responsible for pumping blood throughout the body?

Answer: The heart

Q14. What do we call animals that eat only plants?

Answer: Herbivores

Q15. Which part of a flower becomes the fruit?

Answer: The ovary

Q16. What is the process of a caterpillar turning into a butterfly called?

Answer: Metamorphosis

Q17. How many legs does a spider have?

Answer: Eight

Q18. What is the longest bone in the human body?

Answer: The femur (thigh bone)

Q19. Which gas do plants absorb during photosynthesis?

Answer: Carbon dioxide (CO₂)

Q20. What do we call animals that eat both plants and meat?

Answer: Omnivores

Q21. What is the fluid that carries blood cells through the body?

Answer: Plasma

Q22. Which organ filters waste from the blood to make urine?

Answer: Kidneys

Q23. What is the name of the process by which organisms produce offspring?

Answer: Reproduction

Q24. What do we call the outer protective layer of a tree?

Answer: Bark

Q25. Which part of the brain controls balance and coordination?

Answer: Cerebellum

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2. Chemistry Quiz Questions

Chemistry is the science of matter, what things are made of and how they change and interact. These science questions will introduce kids to the fascinating world of atoms, elements, and chemical reactions.

Q26. What is the chemical symbol for water?

Answer: H₂O

Q27. What is the most abundant gas in Earth’s atmosphere?

Answer: Nitrogen (about 78%)

Q28. What do we call a substance that cannot be broken down into simpler substances by chemical means?

Answer: An element

Q29. What is the chemical formula of table salt?

Answer: NaCl (sodium chloride)

Q30. What is the pH value of pure water?

Answer: 7 (neutral)

Q31. What do we call the smallest particle of an element that retains its chemical properties?

Answer: An atom

Q32. Which element has the chemical symbol ‘O’?

Answer: Oxygen

Q33. What is the process of a liquid turning into a gas called?

Answer: Evaporation

Q34. Which metal is liquid at room temperature?

Answer: Mercury

Q35. What gas is produced when you mix vinegar and baking soda?

Answer: Carbon dioxide (CO₂)

Q36. What is the chemical symbol for gold?

Answer: Au

Q37. What type of bond holds water molecules together?

Answer: Hydrogen bond

Q38. What do we call a substance that speeds up a chemical reaction without being consumed?

Answer: A catalyst

Q39. What is the most reactive group of metals on the periodic table?

Answer: Alkali metals (Group 1)

Q40. What is dry ice made of?

Answer: Solid carbon dioxide (CO₂)

Q41. Which element is the hardest natural substance on Earth?

Answer: Carbon (in the form of diamond)

Q42. What is the name of the scale used to measure acidity or alkalinity?

Answer: The pH scale

Q43. What do we call the change of a solid directly into a gas?

Answer: Sublimation

Q44. Which element has the symbol ‘Fe’ on the periodic table?

Answer: Iron

Q45. What is the process of separating a mixture by passing it through a filter?

Answer: Filtration

Q46. What color does litmus paper turn in an acid?

Answer: Red

Q47. What is the chemical symbol for silver?

Answer: Ag

Q48. What type of reaction produces heat and light, such as burning?

Answer: Combustion reaction

Q49. What is the name of the force that holds atoms together in a molecule?

Answer: Chemical bond

Q50. Which planet in our solar system is made mostly of hydrogen and helium?

Answer: Jupiter

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3. Physics Quiz Questions

Physics explains the fundamental forces and laws that govern our universe, from gravity and electricity to light and sound. These questions will challenge young scientists to think about how the world works.

Q51. What is the speed of light in a vacuum?

Answer: Approximately 300,000 km/s (3 × 10⁸ m/s)

Q52. What force pulls objects toward the Earth?

Answer: Gravity

Q53. Who formulated the three laws of motion?

Answer: Sir Isaac Newton

Q54. What is the unit of electrical resistance?

Answer: Ohm (Ω)

Q55. What type of energy does a moving object have?

Answer: Kinetic energy

Q56. What do we call the energy stored in an object due to its position?

Answer: Potential energy

Q57. What is the unit of force named after a famous scientist?

Answer: Newton (N)

Q58. What type of wave does not require a medium to travel?

Answer: Electromagnetic wave (e.g., light)

Q59. What is the name of the phenomenon where light bends as it passes through different mediums?

Answer: Refraction

Q60. What is the unit of power?

Answer: Watt (W)

Q61. What do we call the bouncing back of light from a surface?

Answer: Reflection

Q62. What is the SI unit of temperature?

Answer: Kelvin (K)

Q63. Which colour has the longest wavelength in the visible spectrum?

Answer: Red

Q64. What is the principle that states energy cannot be created or destroyed?

Answer: Law of Conservation of Energy

Q65. What type of lens is used to correct short-sightedness?

Answer: Concave lens

Q66. What is measured in decibels (dB)?

Answer: Sound intensity (loudness)

Q67. Which particle in an atom has a negative charge?

Answer: Electron

Q68. What is the unit of electric current?

Answer: Ampere (A)

Q69. What do we call the resistance of a liquid to flow?

Answer: Viscosity

Q70. What is the name of the force that opposes the relative motion of two surfaces in contact?

Answer: Friction

Q71. What type of mirror is used in car rear-view mirrors?

Answer: Convex mirror

Q72. What is the formula for calculating speed?

Answer: Speed = Distance ÷ Time

Q73. What do we call the splitting of white light into its constituent colours?

Answer: Dispersion

Q74. Which law states that for every action there is an equal and opposite reaction?

Answer: Newton’s Third Law of Motion

Q75. What do we call the point where all the mass of an object is concentrated for calculation purposes?

Answer: Centre of gravity

Also Read: What is Meant by Mock Tests & How Does it Help Students?

4. Earth Science Quiz Questions

Our planet is a marvel of science, from volcanic eruptions and tectonic plates to weather systems and ocean currents. These questions explore the science of Earth itself.

Q76. What are the three main layers of the Earth?

Answer: Crust, mantle, and core

Q77. What type of rock is formed from cooled lava?

Answer: Igneous rock

Q78. What is the name of the layer of gases surrounding the Earth?

Answer: The atmosphere

Q79. What do we call the study of earthquakes?

Answer: Seismology

Q80. What is the water cycle also known as?

Answer: The hydrological cycle

Q81. Which is the tallest mountain in the world?

Answer: Mount Everest

Q82. What type of cloud is associated with thunderstorms?

Answer: Cumulonimbus

Q83. What causes the seasons on Earth?

Answer: Earth’s tilted axis as it orbits the Sun

Q84. What is the term for rocks formed from compressed sediments?

Answer: Sedimentary rock

Q85. What percentage of the Earth’s surface is covered by water?

Answer: About 71%

Q86. What do we call the boundary between two tectonic plates?

Answer: A fault line

Q87. Which layer of the atmosphere contains the ozone layer?

Answer: The stratosphere

Q88. What is the most common mineral in the Earth’s crust?

Answer: Feldspar

Q89. What do we call a scientist who studies weather?

Answer: Meteorologist

Q90. What is the deepest ocean trench in the world?

Answer: The Mariana Trench

Q91. What is the name of the supercontinent that existed millions of years ago?

Answer: Pangaea

Q92. What causes a rainbow to appear?

Answer: Refraction and reflection of sunlight in water droplets

Q93. What do we call the point inside the Earth where an earthquake originates?

Answer: The focus (or hypocentre)

Q94. What is the name of the scale used to measure earthquake magnitude?

Answer: The Richter Scale (or Moment Magnitude Scale)

Q95. What is the term for the natural breakdown of rocks by water, wind, and temperature changes?

Answer: Weathering

Q96. What do we call the natural satellite that orbits the Earth?

Answer: The Moon

Q97. What type of rock is marble?

Answer: Metamorphic rock

Q98. What is the name of the phenomenon where warm ocean water in the Pacific affects global weather?

Answer: El Niño

Q99. What is the term for the point on the Earth’s surface directly above an earthquake’s focus?

Answer: Epicentre

Q100. What do we call rainforests that receive rainfall throughout the year?

Answer: Tropical rainforests

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5. Space and Astronomy Quiz Questions

The universe is vast, mysterious, and full of wonder. From the planets in our solar system to distant galaxies, these questions will take young minds on an incredible journey through space.

Q101. How many planets are in our solar system?

Answer: Eight

Q102. What is the closest star to Earth?

Answer: The Sun

Q103. Which planet is known as the Red Planet?

Answer: Mars

Q104. What is a light-year a measure of?

Answer: Distance (the distance light travels in one year)

Q105. Which is the largest planet in our solar system?

Answer: Jupiter

Q106. What do we call a rocky body that orbits the Sun and sometimes has a glowing tail?

Answer: A comet

Q107. What is the name of Earth’s galaxy?

Answer: The Milky Way

Q108. Which planet has the most moons?

Answer: Saturn (with over 140 confirmed moons as of 2023)

Q109. What do we call a region of space with gravity so strong that even light cannot escape?

Answer: A black hole

Q110. What is the name of the first artificial satellite launched into space?

Answer: Sputnik 1 (launched by the Soviet Union in 1957)

Q111. Who was the first human to walk on the Moon?

Answer: Neil Armstrong (1969)

Q112. What is the name of the force responsible for keeping planets in orbit around the Sun?

Answer: Gravity

Q113. Which planet is known for its prominent ring system?

Answer: Saturn

Q114. What do we call the dark spots on the Sun’s surface?

Answer: Sunspots

Q115. What type of star is our Sun?

Answer: A yellow dwarf star (G-type main-sequence star)

Q116. What is the term for the path a planet follows around the Sun?

Answer: An orbit

Q117. What do we call a large collection of stars, gas, and dust held together by gravity?

Answer: A galaxy

Q118. Which planet is closest to the Sun?

Answer: Mercury

Q119. What is the name of the largest known volcano in our solar system?

Answer: Olympus Mons (on Mars)

Q120. What do we call a small, rocky body that burns up upon entering Earth’s atmosphere?

Answer: A meteor (shooting star)

Q121. What is the name of NASA’s famous space telescope launched in 1990?

Answer: The Hubble Space Telescope

Q122. Which planet rotates on its side (axial tilt of about 98°)?

Answer: Uranus

Q123. What is the name of the boundary at the edge of our solar system?

Answer: The heliopause

Q124. What do we call the alignment of three or more celestial bodies in a straight line?

Answer: A syzygy

Q125. What is the name of the first man-made object to leave our solar system?

Answer: Voyager 1 (launched in 1977)

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6. Human Body Quiz Questions

The human body is a remarkable machine. With trillions of cells working in perfect harmony, it is one of nature’s greatest masterpieces. These questions explore how our body works, from head to toe.

Q126. How many teeth does an adult human have (including wisdom teeth)?

Answer: 32

Q127. What is the name of the largest artery in the human body?

Answer: The aorta

Q128. Which part of the brain controls thinking, memory, and decision-making?

Answer: The cerebrum

Q129. What is the name of the tube that connects the throat to the stomach?

Answer: The oesophagus

Q130. How many pairs of ribs does the human body have?

Answer: 12 pairs (24 ribs total)

Q131. What is the name of the fluid that lubricates our joints?

Answer: Synovial fluid

Q132. Which vitamin is primarily produced when our skin is exposed to sunlight?

Answer: Vitamin D

Q133. What is the name of the small intestine’s first section?

Answer: The duodenum

Q134. What do we call the tiny air sacs in the lungs where gas exchange takes place?

Answer: Alveoli

Q135. Which gland is known as the ‘master gland’ of the endocrine system?

Answer: The pituitary gland

Q136. What is the name of the protein in red blood cells that carries oxygen?

Answer: Haemoglobin

Q137. How many muscles does the human body have, approximately?

Answer: About 600 muscles

Q138. What do we call the bony structure that protects the brain?

Answer: The skull (cranium)

Q139. What is the name of the involuntary muscle that makes up the heart?

Answer: Cardiac muscle

Q140. Which organ produces bile to help digest fats?

Answer: The liver

Q141. What is the name of the membrane that surrounds the lungs?

Answer: The pleura

Q142. How many chromosomes does a normal human cell contain?

Answer: 46 chromosomes (23 pairs)

Q143. What do we call the area of the skin that contains hair follicles and sweat glands?

Answer: The dermis

Q144. What is the name of the largest part of the large intestine?

Answer: The colon

Q145. Which sense organ contains the cochlea?

Answer: The ear

Q146. What do we call the three tiny bones in the middle ear?

Answer: Ossicles (malleus, incus, and stapes)

Q147. What is the name of the substance that makes up fingernails and hair?

Answer: Keratin

Q148. Which lobe of the brain processes vision?

Answer: The occipital lobe

Q149. What do we call the muscle that separates the chest cavity from the abdominal cavity?

Answer: The diaphragm

Q150. What is the name of the process by which the body maintains a stable internal environment?

Answer: Homeostasis

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7. Environment and Ecology Quiz Questions

Our environment is a complex web of living and non-living things that depend on one another for survival. These questions encourage kids to think about nature, ecosystems, and how we can protect our planet.

Q151. What do we call a community of organisms interacting with their environment?

Answer: An ecosystem

Q152. What is the term for an animal that feeds on dead organic matter?

Answer: A decomposer (or detritivore)

Q153. What is the name of the process by which plants release water vapour through their leaves?

Answer: Transpiration

Q154. What do we call the gradual increase in the Earth’s average temperature due to greenhouse gases?

Answer: Global warming

Q155. Which gas is primarily responsible for the greenhouse effect?

Answer: Carbon dioxide (CO₂)

Q156. What do we call an organism that produces its own food through photosynthesis?

Answer: A producer (autotroph)

Q157. What is the term for the variety of life in a particular habitat or ecosystem?

Answer: Biodiversity

Q158. What do we call the movement of carbon through living organisms, the atmosphere, and the Earth?

Answer: The carbon cycle

Q159. What is the name of the layer in the atmosphere that absorbs harmful UV radiation?

Answer: The ozone layer

Q160. What do we call a food chain that shows the feeding relationships in an ecosystem?

Answer: A food web

Q161. What type of pollution is caused by too much noise in the environment?

Answer: Noise pollution

Q162. What is the term for species that are at risk of becoming extinct?

Answer: Endangered species

Q163. What do we call the natural home or environment of an organism?

Answer: A habitat

Q164. What is acid rain caused by?

Answer: Air pollution (sulphur dioxide and nitrogen oxides dissolving in rainwater)

Q165. What is the name of the process where organic waste is broken down by microorganisms?

Answer: Decomposition

Q166. What do we call the organisms at the top of a food chain?

Answer: Apex predators

Q167. What is the term for the damage caused to an ecosystem by human activities?

Answer: Environmental degradation

Q168. What do we call the relationship where both organisms benefit from each other?

Answer: Mutualism

Q169. What is the name of the zone in the ocean where sunlight does not reach?

Answer: The aphotic zone

Q170. What do we call the process of restoring a forest that has been destroyed?

Answer: Reforestation

Q171. What type of energy does solar power harness?

Answer: Sunlight (solar energy)

Q172. What do we call the movement of animals from one region to another due to seasonal changes?

Answer: Migration

Q173. What is the role an organism plays in its ecosystem called?

Answer: Its ecological niche

Q174. What is the name of the international agreement aimed at reducing greenhouse gas emissions?

Answer: The Paris Agreement (2015)

Q175. What do we call the process by which plants release oxygen as a by-product of photosynthesis?

Answer: Oxygen evolution

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8. Technology and Inventions Quiz Questions

Science and technology go hand in hand. From ancient tools to modern computers, human ingenuity has shaped the world we live in. These questions celebrate some of the most important discoveries and inventions in history.

Q176. Who invented the telephone?

Answer: Alexander Graham Bell (1876)

Q177. What does ‘www’ stand for in a web address?

Answer: World Wide Web

Q178. Who is credited with inventing the practical light bulb?

Answer: Thomas Edison (1879)

Q179. What does ‘DNA’ stand for?

Answer: Deoxyribonucleic acid

Q180. What was the name of the world’s first electronic general-purpose computer?

Answer: ENIAC (1945)

Q181. Who invented the World Wide Web?

Answer: Tim Berners-Lee (1989)

Q182. What does ‘LED’ stand for?

Answer: Light Emitting Diode

Q183. What technology uses sound waves to detect objects underwater?

Answer: SONAR (Sound Navigation and Ranging)

Q184. Who discovered penicillin, the first antibiotic? A

nswer: Alexander Fleming (1928)

Q185. What is the name of the device that converts solar energy into electrical energy?

Answer: A solar cell (photovoltaic cell)

Q186. What does ‘GPS’ stand for?

Answer: Global Positioning System

Q187. Who invented the printing press?

Answer: Johannes Gutenberg (around 1440)

Q188. What do we call a computer program that can learn and improve from experience?

Answer: Artificial intelligence (AI) or machine learning

Q189. What does ‘RAM’ stand for in computing?

Answer: Random Access Memory

Q190. Who is known as the father of modern physics?

Answer: Albert Einstein

Q191. What technology is used in MRI scans to create images of the body?

Answer: Magnetic resonance imaging (using magnetic fields and radio waves)

Q192. Who invented the steam engine that powered the Industrial Revolution?

Answer: James Watt (improved design, 1769)

Q193. What is the name of the programming language created by Guido van Rossum?

Answer: Python

Q194. What do we call a network that connects computers around the world?

Answer: The internet

Q195. What technology is used to create three-dimensional objects layer by layer?

Answer: 3D printing (additive manufacturing)

Q196. What do we call the use of living organisms to develop useful products?

Answer: Biotechnology

Q197. What does ‘CPU’ stand for in computing?

Answer: Central Processing Unit

Q198. Which scientist developed the theory of general relativity?

Answer: Albert Einstein (1915)

Q199. What is the name of the process used to purify drinking water by removing impurities using a membrane?

Answer: Reverse osmosis

Q200. What do we call a machine that can perform tasks automatically without human intervention?

Answer: A robot

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9. Fun Science Trivia Questions

Here are some fascinating and surprising science trivia questions that will leave kids amazed! These are perfect for quiz competitions and are sure to spark lively conversations.

Q201. What is the hottest planet in our solar system?

Answer: Venus (not Mercury, despite being closest to the Sun — its thick atmosphere traps heat)

Q202. What is the only mammal capable of true flight?

Answer: The bat

Q203. How many hearts does an octopus have?

Answer: Three

Q204. What colour is the blood of a horseshoe crab?

Answer: Blue

Q205. Which planet has a day longer than its year?

Answer: Venus

Q206. What is the fear of spiders called?

Answer: Arachnophobia

Q207. Can you hear sound in space?

Answer: No, because space is a vacuum, and sound needs a medium to travel

Q208. What is the smallest planet in our solar system?

Answer: Mercury

Q209. What percentage of the human body is water?

Answer: About 60%

Q210. Why does the sky appear blue?

Answer: Because of the scattering of sunlight by Earth’s atmosphere (Rayleigh scattering)

Q211. What animal has the largest eyes of any living creature?

Answer: The giant squid

Q212. How long does it take for light from the Sun to reach Earth?

Answer: About 8 minutes and 20 seconds

Q213. Which is the only planet in the solar system that rotates clockwise (as seen from above the North Pole)?

Answer: Venus

Q214. What is the name of the world’s largest living structure?

Answer: The Great Barrier Reef

Q215. What do we call a group of fish swimming together?

Answer: A school of fish

Q216. What makes fizzy drinks fizzy?

Answer: Dissolved carbon dioxide (CO₂) gas under pressure

Q217. How many colours are in a rainbow?

Answer: Seven — violet, indigo, blue, green, yellow, orange, and red (VIBGYOR)

Q218. Why do we see lightning before we hear thunder?

Answer: Because light travels much faster than sound

Q219. What is the name of the first man-made object to leave our solar system?

Answer: Voyager 1 (launched in 1977)

Q220. What do we call the outer edge of a shadow where light is only partially blocked?

Answer: The penumbra

Q221. A snail can sleep for how long?

Answer: Up to three years during unfavourable conditions

Q222. Which is the fastest land animal on Earth?

Answer: The cheetah (reaching speeds of up to 120 km/h)

Q223. What is the name of the process by which a liquid becomes a solid?

Answer: Freezing (or solidification)

Q224. What do we call a scientist who studies fossils?

Answer: A palaeontologist

Q225. What is the most abundant element in the universe?

Answer: Hydrogen

Conclusion

Science is not just a subject. It is a lifelong journey of curiosity and discovery. These 200+ quiz questions spanning biology, chemistry, physics, space, and technology give kids a fun and effective way to strengthen their knowledge. Regular quizzing builds confidence, sharpens critical thinking, and makes learning truly enjoyable. 

For students at Delhi Public School Gurugram, this spirit of inquiry aligns perfectly with the school’s vision of nurturing curious, confident, and future-ready young minds