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 Which scientist arranged elements based on their increasing atomic mass? Henry Moseley Glenn Seaborg Dmitri Mendeleev 2 / 80 What happens in an endothermic reaction? No heat change. Heat is absorbed. Heat is released. 3 / 80 What happens to atomic radius across a period? It remains the same It increases It decreases 4 / 80 What is a catalyst? Substance that speeds up a reaction without being consumed. Substance that is consumed in the reaction. Substance that slows down a reaction. 5 / 80 State Newton’s Law of Gravitation. The force between particles is independent of distance. Every particle of matter in the universe attracts every other particle with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Every particle repels every other particle with a force directly proportional to their masses. 6 / 80 Why do noble gases have low reactivity? Because they have an incomplete outer electron shell. Because they have a high number of valence electrons. Because they have a complete outer electron shell. 7 / 80 What is the atomic number of chlorine? 12 7 17 8 / 80 What is the force experienced by a 1 kg mass at the Earth's surface? 98 N 9.8 N 1 N 9 / 80 What is the trend in melting points of alkali metals down the group? Remains the same. Increases. Decreases. 10 / 80 What causes tides on Earth? Gravitational pull of the Moon and Sun. Rotation of the Earth. Wind and ocean currents. 11 / 80 What is the product formed when magnesium reacts with oxygen? Magnesium oxide Magnesium chloride Magnesium carbonate 12 / 80 What is the pH value of a neutral solution? 7 0 14 13 / 80 What is the process of removing soluble impurities from water? Sedimentation Decantation Filtration 14 / 80 What is the formula of rust? FeO Fe₂O₃.xH₂O FeCl₃ 15 / 80 What is the law of reflection of light? Incident ray and reflected ray are perpendicular Angle of incidence = angle of reflection Light bends toward the normal 16 / 80 What is the formula of common salt? KCl NaCl NaOH 17 / 80 What is the term for the movement of particles from high concentration to low concentration? Diffusion Active transport Osmosis 18 / 80 Which metal is most reactive according to the reactivity series? Iron Potassium Gold 19 / 80 What is the name of the process by which plants release oxygen? Transpiration Photosynthesis Respiration 20 / 80 What is the pH value of acidic solutions? More than 7 Less than 7 Equal to 7 21 / 80 What is the term for the resistance of a fluid to flow? Viscosity Density Capillarity 22 / 80 Which is the longest bone in the human body? Femur Humerus Radius 23 / 80 What is the chemical name of vinegar? Lactic acid Acetic acid Formic acid 24 / 80 What is the formula of baking soda? Na₂CO₃ NaHCO₃ CaCO₃ 25 / 80 What is the process by which plants convert sunlight into food? Photosynthesis Respiration Transpiration 26 / 80 What is the chemical formula of gypsum? CaSO₄·2H₂O Ca(OH)₂ CaO 27 / 80 What is the atomic number of oxygen? 10 8 16 28 / 80 Which process is used for the purification of seawater? Desalination Decantation Filtration 29 / 80 Which element is the most abundant in the Earth's crust? Oxygen Silicon Carbon 30 / 80 What is the term for a chemical reaction in which heat is released? Exothermic Neutralization Endothermic 31 / 80 What is the term for the natural process of converting nitrogen gas into compounds usable by plants? Combustion Nitrification Nitrogen fixation 32 / 80 What type of lens is used to correct myopia? Concave Cylindrical Convex 33 / 80 What is the process of depositing a layer of metal on another material using electricity? Electroplating Alloying Rusting 34 / 80 Which element is used in making thermometers? Copper Mercury Zinc 35 / 80 What is the process of removing waste products from the body called? Ingestion Digestion Excretion 36 / 80 What is the effect of acid rain on marble structures? No effect Sublimation Corrosion 37 / 80 What is the term for the device used to convert mechanical energy into electrical energy? Generator Transformer Motor 38 / 80 What is the primary pigment responsible for photosynthesis in plants? Chlorophyll Carotene Xanthophyll 39 / 80 Which part of the eye controls the amount of light entering it? Cornea Retina Iris 40 / 80 What is the boiling point of water at sea level? 150°C 50°C 100°C 41 / 80 What is the term for the property of liquids to rise in a narrow tube? Viscosity Density Capillarity 42 / 80 What is the chemical formula of baking soda? NaCl Na₂CO₃ NaHCO₃ 43 / 80 Which vitamin is essential for healthy eyes? Vitamin C Vitamin B Vitamin A 44 / 80 What is the formula of acetic acid? H₂SO₄ HCl CH₃COOH 45 / 80 What is the chemical formula of hydrochloric acid? H₂SO₄ HNO₃ HCl 46 / 80 Which organ in the human body is responsible for pumping blood? Liver Heart Lungs 47 / 80 What is the name of the gas-filled organ that helps fish maintain buoyancy? Swim bladder Fins Gills 48 / 80 What is the name of the process in which water changes directly into vapor without becoming a liquid? Sublimation Freezing Condensation 49 / 80 What is the most abundant gas in Earth's atmosphere? Argon Nitrogen Oxygen 50 / 80 What is the process by which plants lose water vapor through stomata? Transpiration Respiration Photosynthesis 51 / 80 What is the SI unit of electric current? Ohm Ampere Volt 52 / 80 What is the unit of power in the SI system? Joule Watt Newton 53 / 80 Which type of bond is formed in H₂O? Metallic Covalent Ionic 54 / 80 Which gas is required for combustion? Oxygen Helium Nitrogen 55 / 80 What is the phenomenon where light bends as it passes through different mediums? Diffraction Reflection Refraction 56 / 80 What is the mode of reproduction in amoeba? Spore formation Binary fission Budding 57 / 80 What is the main function of white blood cells? Fight infections Provide energy Transport oxygen 58 / 80 Which organ produces bile in the human body? Pancreas Liver Stomach 59 / 80 Which gas is used in fire extinguishers? Hydrogen Oxygen Carbon dioxide 60 / 80 What is the term for the number of protons in the nucleus of an atom? Mass number Atomic number Valency 61 / 80 Which planet in the solar system is known as the "Evening Star"? Venus Mars Mercury 62 / 80 What is the SI unit of energy? Calorie Newton Joule 63 / 80 What is the process of breaking down glucose to release energy called? Digestion Respiration Photosynthesis 64 / 80 What is the term for the resistance of a liquid to flow? Density Pressure Viscosity 65 / 80 What is the SI unit of work? Pascal Newton Joule 66 / 80 Which organ of the human body produces bile? Stomach Pancreas Liver 67 / 80 What is the force acting on an object due to gravity called? Tension Weight Friction 68 / 80 What is the approximate percentage of nitrogen in Earth's atmosphere? 1% 78% 21% 69 / 80 What is the chemical formula of methane? CH₄ CH₃OH CH₄O 70 / 80 Which gas is responsible for the greenhouse effect? Carbon dioxide Argon Nitrogen 71 / 80 Which gas is required for combustion to occur? Nitrogen Oxygen Carbon dioxide 72 / 80 What is the valency of nitrogen in NH₃? 3 4 5 73 / 80 What is the main component of a cell wall in plants? Lipid Cellulose Protein 74 / 80 Which gas is a major component of biogas? Methane Oxygen Carbon dioxide 75 / 80 Which planet is known as the Red Planet? Mercury Mars Venus 76 / 80 Which planet is known as the "Red Planet"? Mars Mercury Venus 77 / 80 Which organelle is known as the powerhouse of the cell? Ribosome Nucleus Mitochondria 78 / 80 What is the full form of DNA? Deoxyribose nucleic acid Deoxynitrogen acid Deoxyribonucleic acid 79 / 80 What is the principle of an electric motor? Electrostatic force Electrolysis Electromagnetic induction 80 / 80 What is the unit of resistance? Volt Ampere Ohm Your score is LinkedIn Facebook VKontakte 0% Exit
