science test class 10 science test class 10 0% Time Limit 10 minutes Maximum Allowed Time Is over Your Paper Successfully Sent. school1 Class 10 Science 1 1 / 80 The reaction of a metal with oxygen to form a metal oxide is an example of: Reduction Oxidation Decomposition 2 / 80 What is the SI unit of weight? Meter (m) Kilogram (kg) Newton (N) 3 / 80 Which element has the atomic number 8? Carbon Nitrogen Oxygen 4 / 80 What is the law that states mass is neither created nor destroyed in a chemical reaction? Law of Definite Proportions Law of Conservation of Mass Law of Multiple Proportions 5 / 80 Define chemical equation. A physical representation of a chemical change. A mathematical equation describing the energy of a system. A symbolic representation of a chemical reaction. 6 / 80 Which of the following is a noble gas? Sodium Neon Chlorine 7 / 80 What is artificial satellite? Man-made object orbiting Earth. Natural object orbiting Earth. Star orbiting Earth. 8 / 80 What is the force experienced by a 1 kg mass at the Earth's surface? 1 N 9.8 N 98 N 9 / 80 Elements in the same group of the periodic table have the same number of: Valence electrons Protons Neutrons 10 / 80 Who formulated the Law of Universal Gravitation? Isaac Newton Galileo Galilei Albert Einstein 11 / 80 What is the function of the pancreas in the human body? Produces insulin Produces hormones Produces bile 12 / 80 What is the main ore of aluminium? Magnetite Haematite Bauxite 13 / 80 Which part of the human body contains the smallest bones? Nose Ear Hand 14 / 80 What is the mode of nutrition in fungi? Autotrophic Parasitic Heterotrophic 15 / 80 What is the process of removing waste products from the body called? Ingestion Excretion Digestion 16 / 80 Which vitamin is essential for healthy eyes? Vitamin A Vitamin B Vitamin C 17 / 80 Which vitamin is also known as ascorbic acid? Vitamin C Vitamin D Vitamin B 18 / 80 Which is the longest bone in the human body? Radius Humerus Femur 19 / 80 What is the role of chlorophyll in photosynthesis? Absorbing oxygen Absorbing carbon dioxide Absorbing sunlight 20 / 80 What is the speed of light in a vacuum? 2 × 10⁸ m/s 3 × 10⁸ m/s 1.5 × 10⁸ m/s 21 / 80 What is the term for the splitting of light into its constituent colors? Dispersion Refraction Reflection 22 / 80 What is the term for the movement of particles from high concentration to low concentration? Diffusion Active transport Osmosis 23 / 80 Which blood group is known as the universal donor? AB A O 24 / 80 What is the term for the process of heat transfer in fluids due to density differences? Convection Radiation Conduction 25 / 80 Which organ in the human body stores bile? Gallbladder Liver Pancreas 26 / 80 What is the term for the natural process of converting nitrogen gas into compounds usable by plants? Nitrification Nitrogen fixation Combustion 27 / 80 What is the most abundant gas in Earth's atmosphere? Oxygen Nitrogen Argon 28 / 80 What is the process of breaking down food to release energy in cells called? Fermentation Transpiration Cellular respiration 29 / 80 What is the process of breaking down glucose to release energy called? Photosynthesis Respiration Digestion 30 / 80 What is the process by which plants lose water in the form of vapor? Transpiration Photosynthesis Respiration 31 / 80 What is the atomic number of oxygen? 8 16 10 32 / 80 What is the natural satellite of Earth? Sun Mars Moon 33 / 80 What is the term for the splitting of a nucleus into two smaller nuclei, releasing energy? Radioactivity Nuclear fusion Nuclear fission 34 / 80 What is the process of depositing a layer of metal on another material using electricity? Rusting Alloying Electroplating 35 / 80 What is the chemical formula of quicklime? CaCO₃ Ca(OH)₂ CaO 36 / 80 What is the SI unit of electric current? Ampere Ohm Volt 37 / 80 What is the chemical formula of hydrochloric acid? HNO₃ H₂SO₄ HCl 38 / 80 Which part of the human brain is responsible for thinking and decision-making? Medulla oblongata Cerebrum Hypothalamus 39 / 80 Which element is the most abundant in the Earth's crust? Oxygen Carbon Silicon 40 / 80 What is the formula of common salt? NaOH KCl NaCl 41 / 80 Which organelle is called the powerhouse of the cell? Nucleus Ribosome Mitochondria 42 / 80 What is the term for the energy possessed by a body due to its motion? Potential energy Kinetic energy Thermal energy 43 / 80 What is the speed of light in a vacuum? 3 x 10⁷ m/s 3 x 10⁸ m/s 3 x 10⁶ m/s 44 / 80 What is the chemical formula of methane? CH₄ CH₄O CH₃OH 45 / 80 What is the process by which plants convert sunlight into food? Transpiration Respiration Photosynthesis 46 / 80 Which process is used for the purification of seawater? Desalination Filtration Decantation 47 / 80 Which gas is required for combustion to occur? Oxygen Carbon dioxide Nitrogen 48 / 80 What is the full form of DNA? Deoxyribonucleic acid Deoxyribose nucleic acid Deoxynitrogen acid 49 / 80 What is the formula of rust? FeO FeCl₃ Fe₂O₃.xH₂O 50 / 80 Which type of energy is stored in a stretched rubber band? Thermal energy Kinetic energy Potential energy 51 / 80 Which element is used in making thermometers? Zinc Mercury Copper 52 / 80 Which organ filters and removes waste from the blood in humans? Kidney Spleen Liver 53 / 80 What is the term for the number of protons in the nucleus of an atom? Mass number Atomic number Valency 54 / 80 What is the name of the process by which plants release oxygen? Transpiration Photosynthesis Respiration 55 / 80 What is the main cause of acid rain? Carbon monoxide Methane emission Sulphur dioxide 56 / 80 What is the chemical symbol for gold? Pb Ag Au 57 / 80 What is the main element present in diamonds? Silicon Sulphur Carbon 58 / 80 What is the law of reflection of light? Light bends toward the normal Incident ray and reflected ray are perpendicular Angle of incidence = angle of reflection 59 / 80 Which organ in the human body is responsible for pumping blood? Lungs Heart Liver 60 / 80 What is the term for a chemical reaction in which heat is released? Neutralization Endothermic Exothermic 61 / 80 What is the boiling point of ethanol? 78°C 100°C 78.5°C 62 / 80 What is the chemical name of common salt? Sodium chloride Potassium chloride Calcium chloride 63 / 80 Which gas is evolved when calcium carbonate reacts with dilute hydrochloric acid? Oxygen Hydrogen Carbon dioxide 64 / 80 What is the basic unit of heredity? DNA Gene Chromosome 65 / 80 What is the process of conversion of sugar into alcohol called? Respiration Photosynthesis Fermentation 66 / 80 Which gas is required for combustion? Nitrogen Helium Oxygen 67 / 80 What is the chemical formula of quicklime? CaO Ca(OH)₂ CaCO₃ 68 / 80 What is the term for the transfer of heat through direct contact? Radiation Conduction Convection 69 / 80 What is the process of removing soluble impurities from water? Sedimentation Filtration Decantation 70 / 80 Which part of the brain controls balance and coordination? Medulla oblongata Cerebellum Cerebrum 71 / 80 What is the product formed when magnesium reacts with oxygen? Magnesium carbonate Magnesium oxide Magnesium chloride 72 / 80 What is the main constituent of biogas? Carbon dioxide Methane Hydrogen 73 / 80 What is the chemical formula of gypsum? Ca(OH)₂ CaSO₄·2H₂O CaO 74 / 80 What is the primary source of energy on Earth? Electricity Fossil fuels Sun 75 / 80 What is the name of the process in which water changes directly into vapor without becoming a liquid? Condensation Sublimation Freezing 76 / 80 What is the formula for calculating speed? Distance² ÷ Time Distance ÷ Time Distance × Time 77 / 80 What is the outermost layer of the Earth called? Crust Mantle Core 78 / 80 Which component of blood helps in clotting? Platelets Red blood cells Plasma 79 / 80 What is the SI unit of power? Volt Joule Watt 80 / 80 What is the term for the force per unit area applied on a surface? Pressure Density Volume Your score is LinkedIn Facebook VKontakte 0% Exit