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 factor does NOT affect the rate of a chemical reaction? Temperature Concentration of reactants Color of reactants 2 / 80 What is the force experienced by a 1 kg mass at the Earth's surface? 1 N 98 N 9.8 N 3 / 80 What is the common characteristic of elements in the same period? Same number of electron shells Same chemical reactivity Same atomic number 4 / 80 What is the general formula for a hydrocarbon? Hydrocarbon Hydroxide Hydrochloric acid 5 / 80 What is a displacement reaction? An element replaces another element in a compound. Two elements combine to form a product. A compound breaks into elements. 6 / 80 What is the atomic number of carbon? 12 14 6 7 / 80 Who is known as the father of the periodic table? Henry Moseley Dmitri Mendeleev Antoine Lavoisier 8 / 80 What is a combination reaction? Two substances exchange ions. Two or more substances combine to form a single product. A single substance breaks into two or more products. 9 / 80 State the law of conservation of mass. Mass can be created or destroyed in a chemical reaction. Mass changes during a chemical reaction. Mass is neither created nor destroyed in a chemical reaction. 10 / 80 What is the trend in electronegativity across a period? Remains the same. Increases. Decreases. 11 / 80 Which organ in the human body is responsible for pumping blood? Lungs Liver Heart 12 / 80 What is the chemical formula of limewater? CaO Ca(OH)₂ CaCO₃ 13 / 80 What is the process of breaking down food to release energy in cells called? Cellular respiration Transpiration Fermentation 14 / 80 What is the term for the energy possessed by a body due to its motion? Kinetic energy Potential energy Thermal energy 15 / 80 What is the chemical formula of ethanol? C₂H₄ C₂H₅OH C₆H₁₂O₆ 16 / 80 Which planet is known as the Red Planet? Mars Mercury Venus 17 / 80 What is the SI unit of work? Newton Joule Pascal 18 / 80 What is the formula of acetic acid? HCl H₂SO₄ CH₃COOH 19 / 80 What is the chemical formula of methane? CH₄ CH₄O CH₃OH 20 / 80 What is the term for the minimum amount of energy required to start a chemical reaction? Activation energy Thermal energy Potential energy 21 / 80 Which component of blood helps in clotting? Platelets Red blood cells Plasma 22 / 80 What is the formula of baking soda? CaCO₃ NaHCO₃ Na₂CO₃ 23 / 80 What is the term for the natural process of converting nitrogen gas into compounds usable by plants? Nitrogen fixation Nitrification Combustion 24 / 80 What is the process of converting liquid into gas at any temperature called? Evaporation Condensation Freezing 25 / 80 What is the pH value of pure water? 5.5 7 8 26 / 80 What is the term for the splitting of light into its constituent colors? Reflection Dispersion Refraction 27 / 80 Which property of metals allows them to be drawn into wires? Malleability Ductility Conductivity 28 / 80 What is the term for the force per unit area applied on a surface? Volume Density Pressure 29 / 80 What is the term for the process of heat transfer in fluids due to density differences? Conduction Convection Radiation 30 / 80 What is the term for the resistance of a fluid to flow? Viscosity Capillarity Density 31 / 80 Which vitamin is essential for healthy eyes? Vitamin B Vitamin A Vitamin C 32 / 80 What is the formula for calculating speed? Distance ÷ Time Distance² ÷ Time Distance × Time 33 / 80 What is the chemical name of common salt? Potassium chloride Calcium chloride Sodium chloride 34 / 80 Which gas is evolved when calcium carbonate reacts with dilute hydrochloric acid? Carbon dioxide Hydrogen Oxygen 35 / 80 Which gas is used in fire extinguishers? Carbon dioxide Hydrogen Oxygen 36 / 80 Which gas is evolved when zinc reacts with hydrochloric acid? Hydrogen Oxygen Carbon dioxide 37 / 80 What is the main cause of acid rain? Carbon monoxide Sulphur dioxide Methane emission 38 / 80 Which vitamin is also known as ascorbic acid? Vitamin C Vitamin B Vitamin D 39 / 80 Which process is used for the purification of seawater? Desalination Decantation Filtration 40 / 80 Which part of the human body contains the smallest bones? Nose Hand Ear 41 / 80 What type of energy is stored in a stretched rubber band? Potential energy Thermal energy Kinetic energy 42 / 80 What is the term for the movement of particles from high concentration to low concentration? Osmosis Diffusion Active transport 43 / 80 What is the term for the property of liquids to rise in a narrow tube? Density Viscosity Capillarity 44 / 80 What is the process of conversion of sugar into alcohol called? Fermentation Respiration Photosynthesis 45 / 80 What is the pH value of acidic solutions? Equal to 7 Less than 7 More than 7 46 / 80 What is the phenomenon responsible for the blue color of the sky? Refraction Scattering of light Reflection 47 / 80 What is the most abundant gas in Earth's atmosphere? Nitrogen Argon Oxygen 48 / 80 What is the chemical formula of baking soda? NaCl NaHCO₃ Na₂CO₃ 49 / 80 Which organelle is known as the powerhouse of the cell? Ribosome Mitochondria Nucleus 50 / 80 What is the principle of an electric motor? Electrostatic force Electromagnetic induction Electrolysis 51 / 80 What is the energy change in a chemical reaction that absorbs heat? Neutralization Exothermic Endothermic 52 / 80 What is the formula of common salt? KCl NaOH NaCl 53 / 80 Which part of the brain controls balance and coordination? Cerebellum Cerebrum Medulla oblongata 54 / 80 What is the term for organisms that can prepare their own food? Autotrophs Parasites Decomposers 55 / 80 What is the term for a chemical reaction in which heat is released? Endothermic Neutralization Exothermic 56 / 80 What is the effect of rusting on the weight of iron? Decreases No change Increases 57 / 80 What is the term for the transfer of heat through direct contact? Convection Radiation Conduction 58 / 80 Which planet is known as the "Red Planet"? Mercury Venus Mars 59 / 80 What is the SI unit of energy? Calorie Newton Joule 60 / 80 What is the natural satellite of Earth? Moon Sun Mars 61 / 80 What is the type of bond formed by the sharing of electrons? Ionic bond Covalent bond Metallic bond 62 / 80 What is the speed of light in a vacuum? 1.5 × 10⁸ m/s 2 × 10⁸ m/s 3 × 10⁸ m/s 63 / 80 What is the device used to convert AC to DC? Oscillator Rectifier Transformer 64 / 80 What type of lens is used to correct myopia? Convex Cylindrical Concave 65 / 80 What is the chemical formula of gypsum? Ca(OH)₂ CaO CaSO₄·2H₂O 66 / 80 What is the process by which plants convert sunlight into food? Respiration Transpiration Photosynthesis 67 / 80 What is the SI unit of power? Watt Joule Volt 68 / 80 What is the process of separating grains from chaff? Winnowing Threshing Sieving 69 / 80 What is the force acting on an object due to gravity called? Friction Tension Weight 70 / 80 What is the process by which plants lose water in the form of vapor? Photosynthesis Transpiration Respiration 71 / 80 What is the functional unit of the kidney? Alveolus Neuron Nephron 72 / 80 What is the process of converting liquid into vapor? Evaporation Condensation Sublimation 73 / 80 What is the SI unit of electric current? Volt Ampere Watt 74 / 80 What is the mode of reproduction in amoeba? Spore formation Binary fission Budding 75 / 80 What is the main function of hemoglobin in the blood? Provide energy Transport oxygen Fight infections 76 / 80 Which type of energy is stored in a stretched rubber band? Potential energy Thermal energy Kinetic energy 77 / 80 What is the basic unit of heredity? Gene DNA Chromosome 78 / 80 What is the primary function of the stomata in plants? Gas exchange Water absorption Food transport 79 / 80 What is the function of the ozone layer? Traps heat Absorbs oxygen Protects from harmful UV rays 80 / 80 What is the chemical symbol for gold? Pb Au Ag Your score is LinkedIn Facebook VKontakte 0% Exit
