1) What is the chemical symbol for water? a) H2O b) O2 c) CO2 d) H2 e) OH f) HO2 2) Which planet is known as the Red Planet? a) Venus b) Mars c) Jupiter d) Saturn e) Mercury f) Neptune 3) What is the process by which plants make their food? a) Respiration b) Photosynthesis c) Digestion d) Evaporation e) Condensation f) Transpiration 4) What is the largest organ in the human body? a) Heart b) Liver c) Skin d) Brain e) Lungs f) Kidneys 5) What force keeps us on the ground? a) Magnetism b) Gravity c) Friction d) Tension e) Pressure f) Buoyancy 6) What is the boiling point of water? a) 0°C b) 50°C c) 100°C d) 150°C e) 200°C f) 250°C 7) Which gas do plants absorb from the atmosphere? a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen e) Methane f) Helium 8) What is the hardest natural substance on Earth? a) Gold b) Iron c) Diamond d) Silver e) Copper f) Platinum 9) What is the main gas found in the air we breathe? a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen e) Argon f) Helium 10) What is the center of an atom called? a) Electron b) Proton c) Nucleus d) Neutron e) Molecule f) Ion 11) What is the main source of energy for the Earth? a) Wind b) Sun c) Water d) Coal e) Oil f) Gas 12) What is the smallest unit of life? a) Tissue b) Organ c) Cell d) Organism e) Molecule f) Atom 13) What is the chemical formula for table salt? a) NaCl b) KCl c) CaCl2 d) MgCl2 e) LiCl f) AlCl3 14) What is the powerhouse of the cell? a) Nucleus b) Ribosome c) Mitochondria d) Chloroplast e) Golgi apparatus f) Lysosome 15) What is the speed of light? a) 300,000 km/s b) 150,000 km/s c) 100,000 km/s d) 200,000 km/s e) 250,000 km/s f) 350,000 km/s

Grade 7 National Level Science Quiz

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