100 Science Quiz Questions with Answers – Science sparks curiosity and helps young minds explore the wonders of the world! This science quiz is designed for students from Class 3 to Class 10, offering a fun and educational challenge. With science quiz questions tailored to each grade, this collection covers topics like plants, animals, forces, matter, and more. Dive into our science quiz with answers to test your knowledge and learn new facts.
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Here are 100 science quiz questions with answers, split into eight sections: 15 MCQs each for Classes 3 to 7, and 10 MCQs each for Classes 8 to 10. Perfect for classrooms, study groups, or curious learners, these questions will inspire a love for science!
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100 Science Quiz Questions with Answers for CLASS 3
| Questions | Answers |
|---|---|
| What is the main source of energy for Earth? a) Moon b) Sun c) Wind d) Water | b) Sun - The Sun provides heat and light. |
| Which part of a plant makes food? a) Root b) Stem c) Leaf d) Flower | c) Leaf - Leaves use sunlight to make food. |
| What do we breathe to stay alive? a) Oxygen b) Carbon dioxide c) Nitrogen d) Helium | a) Oxygen - We inhale oxygen to breathe. |
| Which animal is a mammal? a) Crocodile b) Python c) Dolphin d) Turtle | c) Dolphin - Mammals give birth to live young. |
| What is water’s solid form called? a) Steam b) Ice c) Vapor d) Liquid | b) Ice - Water freezes into ice. |
| Which sense helps us smell flowers? a) Sight b) Touch c) Smell d) Taste | c) Smell - The nose detects smells. |
| What do plants need to grow? a) Sand b) Water c) Plastic d) Glass | b) Water - Plants need water, sunlight, and air. |
| Which is a natural source of light? a) Bulb b) Candle c) Star d) Flashlight | c) Star - Stars emit natural light. |
| What is the shape of the Earth? a) Flat b) Square c) Sphere d) Triangle | c) Sphere - Earth is a round planet. |
| Which bird cannot fly? a) Eagle b) Penguin c) Sparrow d) Parrot | b) Penguin - Penguins swim instead of flying. |
| What keeps us on the ground? a) Wind b) Gravity c) Heat d) Light | b) Gravity - Gravity pulls us downward. |
| Which is a source of food? a) Stone b) Fruit c) Cloth d) Paper | b) Fruit - Fruits are edible and nutritious. |
| What is the weather like on a rainy day? a) Sunny b) Wet c) Dry d) Cold | b) Wet - Rain makes the weather wet. |
| Which animal lays eggs? a) Dog b) Hen c) Cow d) Horse | b) Hen - Hens lay eggs for reproduction. |
| What do we use to see our reflection? a) Window b) Mirror c) Wall d) Table | b) Mirror - Mirrors reflect our image. |
100 Science Quiz Questions with Answers for CLASS 4
| Questions | Answers |
|---|---|
| Which gas do plants use to make food? a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen | b) Carbon dioxide - Plants use it in photosynthesis. |
| What is the hardest substance in our body? a) Bone b) Skin c) Tooth enamel d) Muscle | c) Tooth enamel - It protects our teeth. |
| Which planet is closest to the Sun? a) Venus b) Mercury c) Earth d) Mars | b) Mercury - It’s the nearest planet. |
| What is a shadow made of? a) Light b) Darkness c) Water d) Air | b) Darkness - Shadows form when light is blocked. |
| Which is a renewable resource? a) Coal b) Oil c) Wind d) Natural gas | c) Wind - It’s naturally replenished. |
| What carries blood to the heart? a) Arteries b) Veins c) Nerves d) Muscles | b) Veins - Veins return blood to the heart. |
| Which is a herbivore? a) Lion b) Cow c) Tiger d) Eagle | b) Cow - Herbivores eat plants. |
| What causes day and night? a) Earth’s rotation b) Moon’s orbit c) Sun’s movement d) Cloud cover | a) Earth’s rotation - It rotates every 24 hours. |
| Which is a conductor of electricity? a) Wood b) Plastic c) Copper d) Rubber | c) Copper - Metals conduct electricity. |
| What is the process of water turning into vapor? a) Condensation b) Evaporation c) Freezing d) Melting | b) Evaporation - Water becomes vapor with heat. |
| Which organ helps us hear? a) Eye b) Nose c) Ear d) Tongue | c) Ear - Ears detect sound waves. |
| What type of rock is marble? a) Igneous b) Sedimentary c) Metamorphic d) Volcanic | c) Metamorphic - Formed under heat and pressure. |
| Which insect helps pollinate flowers? a) Ant b) Bee c) Mosquito d) Cockroach | b) Bee - Bees transfer pollen. |
| What is the boiling point of water? a) 50°C b) 100°C c) 0°C d) 25°C | b) 100°C - Water boils at this temperature. |
| Which is a source of clean energy? a) Coal b) Solar c) Oil d) Gas | b) Solar - Sunlight is clean and renewable. |
100 Science Quiz Questions with Answers for CLASS 5
| Questions | Answers |
|---|---|
| What is the main source of oxygen on Earth? a) Animals b) Plants c) Oceans d) Clouds | b) Plants - They release oxygen during photosynthesis. |
| Which force slows down a moving object? a) Gravity b) Friction c) Magnetism d) Push | b) Friction - It opposes motion. |
| What is the largest organ in the human body? a) Heart b) Brain c) Skin d) Liver | c) Skin - It covers the entire body. |
| Which planet is known as the Red Planet? a) Jupiter b) Mars c) Venus d) Saturn | b) Mars - Due to its reddish surface. |
| What is a fossil? a) Living plant b) Dead animal c) Preserved remains d) New rock | c) Preserved remains - Of ancient organisms. |
| Which is a non-magnetic material? a) Iron b) Nickel c) Wood d) Steel | c) Wood - It’s not attracted to magnets. |
| What is the process of food breaking down in the body? a) Digestion b) Respiration c) Circulation d) Excretion | a) Digestion - Breaks food into nutrients. |
| Which is a carnivore? a) Deer b) Lion c) Elephant d) Rabbit | b) Lion - Carnivores eat meat. |
| What is the center of the solar system? a) Earth b) Moon c) Sun d) Jupiter | c) Sun - Planets orbit around it. |
| Which gas is used in balloons to make them float? a) Oxygen b) Helium c) Carbon dioxide d) Nitrogen | b) Helium - It’s lighter than air. |
| What is the freezing point of water? a) 0°C b) 100°C c) 50°C d) -10°C | a) 0°C - Water turns to ice. |
| Which is a biodegradable material? a) Plastic b) Paper c) Glass d) Metal | b) Paper - It decomposes naturally. |
| What causes tides in the ocean? a) Wind b) Sun c) Moon d) Clouds | c) Moon - Its gravity pulls water. |
| Which is an example of a simple machine? a) Computer b) Lever c) Car d) Television | b) Lever - Helps lift or move objects. |
| What protects Earth from harmful sun rays? a) Clouds b) Ozone layer c) Atmosphere d) Rain | b) Ozone layer - Blocks UV rays. |
100 Science Quiz Questions with Answers for CLASS 6
| Questions | Answers |
|---|---|
| What is the smallest unit of life? a) Cell b) Tissue c) Organ d) Atom | a) Cell - The basic building block of life. |
| Which type of energy is stored in food? a) Kinetic b) Chemical c) Thermal d) Mechanical | b) Chemical - Released during digestion. |
| What is the SI unit of force? a) Watt b) Newton c) Joule d) Meter | b) Newton - Measures force. |
| Which part of a plant absorbs water? a) Leaf b) Stem c) Root d) Flower | c) Root - Absorbs water and nutrients. |
| What is a mixture of two or more substances? a) Element b) Compound c) Solution d) Atom | c) Solution - Like saltwater. |
| Which planet has the most moons? a) Jupiter b) Saturn c) Uranus d) Neptune | b) Saturn - Has over 80 moons. |
| What is the process of plants losing water? a) Photosynthesis b) Transpiration c) Respiration d) Digestion | b) Transpiration - Water evaporates from leaves. |
| Which is a source of sound energy? a) Sun b) Drum c) Fire d) Wind | b) Drum - Vibrations create sound. |
| What is the chemical symbol for water? a) CO2 b) H2O c) O2 d) N2 | b) H2O - Two hydrogen, one oxygen. |
| Which is an example of a balanced diet? a) Only rice b) Fruits and vegetables c) Only sweets d) Only meat | b) Fruits and vegetables - Includes all nutrients. |
| What is the main function of red blood cells? a) Fight infection b) Carry oxygen c) Digest food d) Form clots | b) Carry oxygen - To body tissues. |
| Which is a non-renewable resource? a) Wind b) Coal c) Solar d) Water | b) Coal - Takes millions of years to form. |
| What is the angle of reflection equal to? a) Angle of incidence b) 90 degrees c) Angle of refraction d) 180 degrees | a) Angle of incidence - Law of reflection. |
| Which animal is an amphibian? a) Snake b) Frog c) Crocodile d) Lizard | b) Frog - Lives on land and water. |
| What is the main source of energy for a food chain? a) Animals b) Sun c) Water d) Soil | b) Sun - Drives photosynthesis. |
100 Science Quiz Questions with Answers for CLASS 7
| Questions | Answers |
|---|---|
| What is the process of breaking down food for energy? a) Photosynthesis b) Respiration c) Digestion d) Circulation | b) Respiration - Releases energy in cells. |
| Which is a physical change? a) Burning wood b) Melting ice c) Rusting iron d) Cooking food | b) Melting ice - Reversible change. |
| What is the SI unit of electric current? a) Volt b) Ampere c) Ohm d) Watt | b) Ampere - Measures current flow. |
| Which acid is found in lemon? a) Hydrochloric b) Citric c) Sulfuric d) Nitric | b) Citric - Gives lemons their sour taste. |
| What is the speed of light in a vacuum? a) 300,000 km/s b) 150,000 km/s c) 500,000 km/s d) 100,000 km/s | a) 300,000 km/s - Universal constant. |
| Which is a greenhouse gas? a) Oxygen b) Nitrogen c) Carbon dioxide d) Helium | c) Carbon dioxide - Traps heat in the atmosphere. |
| What is the main source of energy in a hydroelectric dam? a) Wind b) Water c) Sun d) Coal | b) Water - Moving water spins turbines. |
| Which organ pumps blood in the body? a) Lung b) Heart c) Kidney d) Liver | b) Heart - Circulates blood. |
| What is the chemical formula for table salt? a) NaCl b) KCl c) CaCO3 d) MgO | a) NaCl - Sodium chloride. |
| Which type of soil holds the most water? a) Sandy b) Clay c) Loamy d) Rocky | b) Clay - Has fine particles. |
| What is the primary source of energy for Earth’s climate? a) Moon b) Sun c) Earth’s core d) Oceans | b) Sun - Drives weather patterns. |
| Which is a vertebrate? a) Jellyfish b) Snake c) Starfish d) Octopus | b) Snake - Has a backbone. |
| What is the pH of pure water? a) 7 b) 14 c) 0 d) 5 | a) 7 - Neutral pH. |
| Which is a type of simple lens? a) Convex b) Prism c) Mirror d) Cylinder | a) Convex - Curves outward. |
| What is the process of soil being washed away? a) Erosion b) Weathering c) Deposition d) Sedimentation | a) Erosion - Caused by wind or water. |
100 Science Quiz Questions with Answers for CLASS 8
| Questions | Answers |
|---|---|
| What is the main source of energy for Earth’s crust movements? a) Sun b) Earth’s core c) Moon d) Wind | b) Earth’s core - Drives plate tectonics. |
| Which metal is liquid at room temperature? a) Iron b) Mercury c) Aluminum d) Copper | b) Mercury - Used in thermometers. |
| What is the unit of pressure? a) Pascal b) Newton c) Joule d) Watt | a) Pascal - Measures force per area. |
| Which cell organelle is the powerhouse of the cell? a) Nucleus b) Mitochondria c) Ribosome d) Golgi body | b) Mitochondria - Produces energy. |
| What causes an earthquake? a) Volcanic eruption b) Plate movement c) Heavy rain d) Wind storms | b) Plate movement - Shifts in Earth’s crust. |
| Which is a synthetic fiber? a) Cotton b) Wool c) Nylon d) Silk | c) Nylon - Man-made material. |
| What is the charge of a proton? a) Negative b) Positive c) Neutral d) Variable | b) Positive - Found in the nucleus. |
| Which gas is used in fire extinguishers? a) Oxygen b) Carbon dioxide c) Nitrogen d) Helium | b) Carbon dioxide - Smothers fire. |
| What is the study of stars called? a) Geology b) Astronomy c) Biology d) Chemistry | b) Astronomy - Studies celestial bodies. |
| Which hormone regulates blood sugar? a) Adrenaline b) Insulin c) Thyroxine d) Estrogen | b) Insulin - Produced by the pancreas. |
100 Science Quiz Questions with Answers for CLASS 9
| Questions | Answers |
|---|---|
| What is the SI unit of work? a) Newton b) Joule c) Watt d) Pascal | b) Joule - Measures energy transfer. |
| Which is the most abundant gas in the atmosphere? a) Oxygen b) Nitrogen c) Carbon dioxide d) Argon | b) Nitrogen - About 78% of air. |
| What is the atomic number of carbon? a) 6 b) 8 c) 12 d) 14 | a) 6 - Number of protons. |
| Which law states that force equals mass times acceleration? a) Newton’s First b) Newton’s Second c) Newton’s Third d) Law of Gravitation | b) Newton’s Second - F = ma. |
| What is the process of cell division in body cells? a) Meiosis b) Mitosis c) Binary fission d) Budding | b) Mitosis - For growth and repair. |
| Which is a vector quantity? a) Speed b) Distance c) Velocity d) Time | c) Velocity - Has direction and magnitude. |
| What is the chemical name for baking soda? a) Sodium chloride b) Sodium bicarbonate c) Calcium carbonate d) Sodium hydroxide | b) Sodium bicarbonate - Used in cooking. |
| Which tissue transports food in plants? a) Xylem b) Phloem c) Epidermis d) Cortex | b) Phloem - Carries nutrients. |
| What is the speed of sound in air? a) 343 m/s b) 300 m/s c) 400 m/s d) 500 m/s | a) 343 m/s - At room temperature. |
| Which is a communicable disease? a) Diabetes b) Influenza c) Cancer d) Asthma | b) Influenza - Spreads through contact. |
100 Science Quiz Questions with Answers for CLASS 10
| Questions | Answers |
|---|---|
| What is the focal length of a plane mirror? a) Zero b) Infinity c) 1 meter d) Negative | b) Infinity - Plane mirrors have no curvature. |
| Which gas is produced during photosynthesis? a) Carbon dioxide b) Oxygen c) Nitrogen d) Hydrogen | b) Oxygen - Released by plants. |
| What is the valency of oxygen? a) 1 b) 2 c) 3 d) 4 | b) 2 - Forms two bonds. |
| Which part of the brain controls balance? a) Cerebrum b) Cerebellum c) Medulla d) Hypothalamus | b) Cerebellum - Coordinates movement. |
| What is the formula for electric power? a) P = VI b) P = V/I c) P = IR d) P = V/R | a) P = VI - Power in watts. |
| Which is a homologous series? a) Alkanes b) Metals c) Salts d) Acids | a) Alkanes - Same functional group. |
| What is the law of conservation of mass? a) Mass is created b) Mass is destroyed c) Mass is conserved d) Mass changes | c) Mass is conserved - In chemical reactions. |
| Which is a renewable source of energy? a) Coal b) Wind c) Petroleum d) Natural gas | b) Wind - Naturally replenished. |
| What is the unit of magnetic field strength? a) Tesla b) Weber c) Ampere d) Ohm | a) Tesla - Measures magnetic field. |
| Which process produces gametes? a) Mitosis b) Meiosis c) Fission d) Fusion | b) Meiosis - Forms sex cells. |
Conclusion
We hope these 100 science quiz questions with answers have ignited your curiosity and deepened your understanding of science! From basic concepts for younger learners to advanced topics for older students, this quiz is perfect for all. Keep exploring the wonders of science!
Stay curious and keep learning!
