Science question answers help explain natural phenomena by providing clear, factual responses based on scientific principles. They encourage curiosity, enhance understanding, and promote critical thinking. Covering topics like physics, biology, and chemistry, these Q&As support learning by breaking down complex concepts into simple explanations, making science accessible and engaging for everyone.

Q.1: What is the chemical symbol for water? Ans. H2O
Q.2: What planet is known as the “Red Planet”? Ans. Mars
Q.3: How many bones are in an adult human body? Ans. 206
Q.4: What gas do plants absorb from the atmosphere during photosynthesis? Ans. Carbon dioxide
Q.5: What is the fastest land animal? Ans. Cheetah
Q.6: What is the largest planet in our solar system? Ans. Jupiter
Q.7: What organ pumps blood through the human body? Ans. Heart
Q.8: What gas do we breathe in to survive? Ans. Oxygen
Q.9: How many legs does a spider have? Ans. Eight
Q.10: What is the hardest natural substance on Earth? Ans. Diamond
Q.11: What is the closest star to Earth? Ans. The Sun
Q.12: What do you call a baby frog? Ans. Tadpole
Q.13: What is the largest mammal in the world? Ans. Blue whale
Q.14: How many sides does a triangle have? Ans. Three
Q.15: What force keeps us on the ground? Ans. Gravity
Q.16: What is the main gas in the air we breathe? Ans. Nitrogen (78%)
Q.17: What do bees make? Ans. Honey
Q.18: What is the center of an atom called? Ans. Nucleus
Q.19: What do you call animals that eat only plants? Ans. Herbivores
Q.20: What is the smallest unit of life? Ans. Cell
Q.21: What is frozen water called? Ans. Ice
Q.22: How many chambers does a human heart have? Ans. Four
Q.23: What gas do plants release during photosynthesis? Ans. Oxygen
Q.24: What is the Earth’s natural satellite? Ans. The Moon
Q.25: What do you call a scientist who studies rocks? Ans. Geologist
Q.26: What is the largest organ in the human body? Ans. The skin
Q.27: What is the speed of light in a vacuum? Ans. Approximately 299,792,458 meters per second
Q.28: Who developed the theory of evolution by natural selection? Ans. Charles Darwin
Q.29: What is the pH of pure water? Ans. 7 (neutral)
Q.30: What element has the chemical symbol “Au”? Ans. Gold
Q.31: Which part of the brain controls balance and coordination? Ans. The cerebellum
Q.32: What is the most abundant gas in Earth’s atmosphere? Ans. Nitrogen
Q.33: What is the study of heredity called? Ans. Genetics
Q.34: What type of bond holds water molecules together? Ans. Hydrogen bonds
Q.35: What is the smallest bone in the human body? Ans. The stapes (in the ear)
Q.36: What causes the seasons on Earth? Ans. The tilt of Earth’s axis
Q.37: What is the chemical formula for table salt? Ans. NaCl (sodium chloride)
Q.38: What is the powerhouse of the cell? Ans. Mitochondria
Q.39: What scale measures earthquake intensity? Ans. Richter scale
Q.40: What is the study of insects called? Ans. Entomology
Q.41: What type of rock is formed by cooling magma? Ans. Igneous rock
Q.42: What is the chemical symbol for iron? Ans. Fe
Q.43: What organ produces insulin? Ans. Pancreas
Q.44: What is the smallest particle of an element? Ans. Atom
Q.45: What causes tides in Earth’s oceans? Ans. Gravitational pull of the Moon and Sun
Q.46: What is the study of weather called? Ans. Meteorology
Q.47: What type of blood vessel carries blood away from the heart? Ans. Arteries
Q.48: What is the chemical formula for carbon dioxide? Ans. CO2
Q.49: What is the longest bone in the human body? Ans. Femur (thigh bone)
Q.50: What galaxy is Earth located in? Ans. Milky Way
Q.51: What is the study of fungi called? Ans. Mycology
Q.52: What gas makes up about 21% of Earth’s atmosphere? Ans. Oxygen
Q.53: What is the liquid part of blood called? Ans. Plasma
Q.54: What is the study of earthquakes called? Ans. Seismology
Q.55: What type of animal is a dolphin? Ans. Mammal
Q.56: What is the chemical symbol for carbon? Ans. C
Q.57: What is the largest artery in the human body? Ans. Aorta
Q.58: What planet is closest to the Sun? Ans. Mercury
Q.59: What is the study of birds called? Ans. Ornithology
Q.60: What type of rock is marble? Ans. Metamorphic rock
Q.61: What is the chemical symbol for helium? Ans. He
Q.62: What is the strongest muscle in the human body? Ans. Jaw muscle (masseter)
Q.63: What planet has the most moons? Ans. Saturn
Q.64: What is the study of plants called? Ans. Botany
Q.65: What type of bond involves sharing electrons? Ans. Covalent bond
Q.66: What is the largest bone in the human body? Ans. Femur
Q.67: What is the study of the ocean called? Ans. Oceanography
Q.68: What gas is produced when metals react with acid? Ans. Hydrogen
Q.69: What is the smallest planet in our solar system? Ans. Mercury
Q.70: What is the study of fossils called? Ans. Paleontology
Q.71: What type of blood cell fights infection? Ans. White blood cells
Q.72: What is the chemical symbol for oxygen? Ans. O
Q.73: What is the study of stars called? Ans. Astronomy
Q.74: What organ filters waste from blood? Ans. Kidneys
Q.75: What is the study of matter and energy called? Ans. Physics
Q.76: What is the Heisenberg Uncertainty Principle? Ans. You cannot simultaneously know both the exact position and momentum of a particle
Q.77: What is the deepest oceanic trench? Ans. The Mariana Trench
Q.78: Who discovered penicillin? Ans. Alexander Fleming
Q.79: What is a supernova? Ans. A powerful stellar explosion that occurs at the end of a massive star’s life
Q.80: What does CRISPR stand for? Ans. Clustered Regularly Interspaced Short Palindromic Repeats
Q.81: What is the half-life of Carbon-14? Ans. Approximately 5,730 years
Q.82: What is the name of the theoretical boundary around a black hole? Ans. Event horizon
Q.83: What is the most reactive element on the periodic table? Ans. Fluorine
Q.84: What is the scientific name for the human species? Ans. Homo sapiens
Q.85: What is the study of the immune system called? Ans. Immunology
Q.86: What is the rarest naturally occurring element? Ans. Astatine
Q.87: What is the name of the process by which stars create heavier elements? Ans. Nuclear fusion
Q.88: What is the smallest unit of genetic information? Ans. Gene
Q.89: What is the study of the structure of organisms called? Ans. Anatomy
Q.90: What is the name of the theory that explains the origin of the universe? Ans. Big Bang Theory
Q.91: What is the chemical formula for ammonia? Ans. NH3
Q.92: What is the study of the nervous system called? Ans. Neurology
Q.93: What is the name of the effect that causes moving clocks to run slower? Ans. Time dilation
Q.94: What is the most electronegative element? Ans. Fluorine
Q.95: What is the study of genes and heredity called? Ans. Genetics
Q.96: What is the name of the particle that carries the electromagnetic force? Ans. Photon
Q.97: What is the chemical formula for methane? Ans. CH4
Q.98: What is the study of the endocrine system called? Ans. Endocrinology
Q.99: What is the name of the boundary between two tectonic plates? Ans. Fault line
Q.100: What is the most stable isotope of uranium? Ans. Uranium-238
Q.101: What is the study of the digestive system called? Ans. Gastroenterology
Q.102: What is the name of the process by which water moves through plants? Ans. Transpiration
Q.103: What is the chemical formula for sulfuric acid? Ans. H2SO4
Q.104: What is the study of the respiratory system called? Ans. Pulmonology
Q.105: What is the name of the force that holds atomic nuclei together? Ans. Strong nuclear force
Q.106: What is the most abundant element in the universe? Ans. Hydrogen
Q.107: What is the study of the circulatory system called? Ans. Cardiology
Q.108: What is the name of the process by which cells divide to form gametes? Ans. Meiosis
Q.109: What is the chemical formula for hydrochloric acid? Ans. HCl
Q.110: What is the study of the urinary system called? Ans. Urology
Q.111: What is the name of the particle that mediates the weak nuclear force? Ans. W and Z bosons
Q.112: What is the densest naturally occurring element? Ans. Osmium
Q.113: What is the study of the muscular system called? Ans. Myology
Q.114: What is the name of the process by which plants respond to light? Ans. Phototropism
Q.115: What is the chemical formula for nitric acid? Ans. HNO3
Q.116: What is the study of the skeletal system called? Ans. Osteology
Q.117: What is the name of the theoretical particle that gives mass to other particles? Ans. Higgs boson
Q.118: What is the lightest noble gas? Ans. Helium
Q.119: What is the study of the skin called? Ans. Dermatology
Q.120: What is the name of the process by which plants respond to gravity? Ans. Gravitropism
Q.121: What is the chemical formula for phosphoric acid? Ans. H3PO4
Q.122: What is the study of the eyes called? Ans. Ophthalmology
Q.123: What is the name of the theoretical particle that makes up dark matter? Ans. WIMP (Weakly Interacting Massive Particle)
Q.124: What is the heaviest naturally occurring element? Ans. Uranium
Q.125: What is the study of the ears called? Ans. Otology
Q.126: How many ribs does a human have? Ans. 24 (12 pairs)
Q.127: What is the largest muscle in the human body? Ans. Gluteus maximus
Q.128: What percentage of the human body is water? Ans. Approximately 60%
Q.129: How many taste buds does the average human have? Ans. About 10,000
Q.130: What is the smallest muscle in the human body? Ans. Stapedius (in the ear)
Q.131: How many teeth does an adult human have? Ans. 32
Q.132: What is the longest nerve in the human body? Ans. Sciatic nerve
Q.133: How many chromosomes do humans have? Ans. 46 (23 pairs)
Q.134: What is the average human body temperature? Ans. 98.6°F (37°C)
Q.135: How many vertebrae are in the human spine? Ans. 33
Q.136: What is the fastest-healing part of the human body? Ans. The tongue
Q.137: How many chambers does a human stomach have? Ans. One
Q.138: What is the largest gland in the human body? Ans. Liver
Q.139: How many muscles are in the human face? Ans. About 43
Q.140: What is the smallest organ in the human body? Ans. Pineal gland
Q.141: How many liters of blood does the human heart pump per day? Ans. About 7,000 liters
Q.142: What is the hardest substance in the human body? Ans. Tooth enamel
Q.143: How many hairs are on the average human head? Ans. About 100,000
Q.144: What is the largest joint in the human body? Ans. Knee
Q.145: How many times does the average human blink per day? Ans. About 17,000 times
Q.146: How many hearts does an octopus have? Ans. Three
Q.147: What is the only mammal capable of true flight? Ans. Bats
Q.148: How many stomachs does a cow have? Ans. Four
Q.149: What is the fastest bird in the world? Ans. Peregrine falcon
Q.150: How many legs does a lobster have? Ans. Ten
Q.151: What is the largest lizard in the world? Ans. Komodo dragon
Q.152: How many eyes does a bee have? Ans. Five
Q.153: What is the slowest mammal in the world? Ans. Three-toed sloth
Q.154: How many teeth does a shark have? Ans. Varies, but can have 3,000+ at one time
Q.155: What is the largest bird in the world? Ans. Ostrich
Q.156: How many chambers does a bird’s heart have? Ans. Four
Q.157: What is the most venomous snake in the world? Ans. Inland taipan
Q.158: How many pairs of legs does a centipede have? Ans. 15-177 pairs (varies by species)
Q.159: What is the largest cat in the world? Ans. Siberian tiger
Q.160: Who invented the telephone? Ans. Alexander Graham Bell
Q.161: Which invention laid the foundation for the Internet? Ans. ARPANET
Q.162: Which invention revolutionized transportation with assembly line production? Ans. Automobile
Q.163: Who is credited with inventing the World Wide Web? Ans. Tim Berners-Lee
Q.164: Which invention facilitated long-distance communication using electrical signals? Ans. Telegraph
Q.165: What invention transformed the way information was stored and retrieved? Ans. Computer
Q.166: Who is known for inventing the light bulb? Ans. Thomas Edison
Q.167: Which invention enabled mass production of printed materials? Ans. Printing Press
Q.168: What invention brought a new era of entertainment and communication through moving pictures? Ans. Motion Pictures
Q.169: Who developed the first successful polio vaccine? Ans. Jonas Salk
Q.170: Which invention revolutionized the way people listen to music on-the-go? Ans. Portable Music Player
Q.171: What invention marked the beginning of the industrial revolution with efficient cotton production? Ans. Cotton Gin
Q.172: Who is the inventor of the first practical photographic process? Ans. Louis Daguerre
Q.173: Which invention profoundly impacted global navigation and trade through accurate timekeeping? Ans. Marine Chronometer
Q.174: What invention significantly improved agricultural efficiency with mechanized plowing? Ans. Tractor
Q.175: Who invented the first successful airplane? Ans. Wright Brothers
Q.176: Which invention allowed for efficient long-distance communication using a series of electrical impulses? Ans. Telegraph
Q.177: What invention revolutionized personal computing with a user-friendly graphical interface? Ans. Graphical User Interface (GUI)
Q.178: Who developed the first successful smallpox vaccine? Ans. Edward Jenner
Q.179: Who discovered penicillin? Ans. Alexander Fleming
Q.180: Which scientist discovered the theory of general relativity? Ans. Albert Einstein
Q.181: Who discovered the double-helix structure of DNA? Ans. James Watson and Francis Crick
Q.182: Which scientist discovered the law of gravity? Ans. Isaac Newton
Q.183: Who discovered X-rays? Ans. Wilhelm Conrad Röntgen
Q.184: Which scientist discovered the process of vaccination? Ans. Edward Jenner
Q.185: Who discovered the circulation of blood in the human body? Ans. William Harvey
Q.186: Which scientist discovered the cure for scurvy? Ans. James Lind
Q.187: Who discovered the concept of anesthesia? Ans. William T. G. Morton
Q.188: Which scientist discovered the first successful organ transplant? Ans. Joseph Murray
Q.189: Who discovered the structure of the atom? Ans. Niels Bohr
Q.190: Which scientist discovered the polio vaccine? Ans. Jonas Salk
Q.191: Who discovered the process of pasteurization? Ans. Louis Pasteur
Q.192: Which scientist discovered the smallpox vaccine? Ans. Edward Jenner
Q.193: Who discovered the first antibiotic, sulfa drugs? Ans. Gerhard Domagk
Q.194: Which scientist discovered the concept of blood groups? Ans. Karl Landsteiner
Q.195: Who discovered the role of insulin in diabetes treatment? Ans. Frederick Banting
Q.196: Which scientist discovered the link between cholera and contaminated water? Ans. John Snow
Q.197: Who discovered the connection between smoking and lung cancer? Ans. Richard Doll
Q.198: What was the first man-made object to reach interstellar space? Ans. Voyager 1
Q.199: Which space telescope confirmed the existence of thousands of exoplanets? Ans. Kepler Space Telescope
Q.200: What dwarf planet was visited by the New Horizons spacecraft in 2015? Ans. Pluto

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