Is Matter Around Us Pure (क्या हमारे आस-पास के पदार्थ शुद्ध है) Ch(2) Practice Quiz in Hindi Part – 1 || Class 9 Science Practice Quizzes in English Posted on February 28, 2025February 28, 2025 by Anshul Gupta0% 0 votes, 0 avg 3 Is Matter Around Us Pure (क्या हमारे आस-पास के पदार्थ शुद्ध है) Ch(2)Practice Quiz in Hindi Part – 1 || Class 9 Science Practice Quizzes in English 1 / 201. Which of the following is an example of a chemical change? A. Melting of ice B. Burning of wood C. Boiling of water D. Dissolving sugar in water Explanation: Burning wood involves a chemical reaction between the wood and oxygen, producing new substances like ash, carbon dioxide, and water vapor. 2 / 202. Which of the following is an example of a physical change? A. Burning of a candle B. Rusting of iron C. Cooking of food D. Melting of butter Explanation: Melting butter is a physical change because it only changes the state of the substance from solid to liquid, without altering its chemical composition. 3 / 203. What is the dispersion medium in a colloid? A. The component in which the dispersed phase is suspended B. The solute-like component or the dispersed particles C. The component present in lesser amount D. The component present in larger amount Explanation: The dispersion medium is the substance in which the dispersed phase is distributed. It is analogous to the solvent in a solution. 4 / 204. Which of the following is NOT a method of expressing the concentration of a solution? A. Volume by volume percentage B. Mass by volume percentage C. Temperature by temperature percentage D. Mass by mass percentage Explanation: The concentration of a solution is typically expressed as the amount of solute relative to the amount of solvent or solution. The methods mentioned in the text are mass by mass percentage, mass by volume percentage, and volume by volume percentage. 5 / 205. Which of the following is an example of an element? A. Gold B. Salt C. Water D. Sugar Explanation: Gold is an element because it cannot be broken down into simpler substances by chemical reactions. 6 / 206. What is the difference between a solution and a suspension? A. The particles in a solution do not settle down, while those in a suspension do. B. A solution is homogeneous, while a suspension is heterogeneous. C. The particles in a solution are smaller than those in a suspension. D. All of the above Explanation: Solutions and suspensions differ in their homogeneity, particle size, and stability. Solutions are homogeneous, have tiny particles, and are stable, while suspensions are heterogeneous, have larger particles, and are unstable. 7 / 207. What is the size range of particles in a colloid? A. Less than 1 nm B. Any size C. 1 nm to 1000 nm D. Greater than 1000 nm Explanation: Colloidal particles are larger than molecules but not large enough to be seen with the naked eye. They range from 1 to 1000 nanometers in diameter. 8 / 208. What is the Tyndall effect? A. The scattering of light by particles in a colloid B. The separation of a mixture by filtration C. The dissolving of a solute in a solvent D. The settling of particles in a suspension Explanation: The Tyndall effect is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible. 9 / 209. Which of the following is NOT a property of a suspension? A. Particles are visible to the naked eye B. Stable C. Heterogeneous mixture D. Particles scatter light Explanation: Suspensions are unstable, meaning the particles will settle down over time due to gravity. 10 / 2010. What is the dispersed phase in a colloidal solution? A. The component present in lesser amount B. The solute-like component or the dispersed particles C. The component present in larger amount D. The component in which the dispersed phase is suspended Explanation: In a colloid, the dispersed phase is the substance that is distributed throughout the dispersion medium. It is analogous to the solute in a solution. 11 / 2011. What is the difference between a compound and a mixture? A. A compound has a fixed composition, while a mixture has a variable composition. B. A compound can be separated by physical methods, while a mixture cannot. C. A compound is formed by a chemical change, while a mixture is formed by a physical change. D. A compound shows the properties of its constituent substances, while a mixture does not. Explanation: A compound is formed when two or more elements chemically combine in a fixed ratio. A mixture is formed when two or more substances are combined physically, and their ratio can vary. 12 / 2012. What is a saturated solution? A. A solution that is heated to a high temperature B. A solution that cannot dissolve any more solute at a given temperature C. A solution that can dissolve more solute at a given temperature D. A solution that is cooled to a low temperature Explanation: A saturated solution is a solution in which the maximum amount of solute has been dissolved at a given temperature. 13 / 2013. Which of the following is NOT a characteristic property of metals? A. Ductile B. Malleable C. Lustre D. Poor conductor of heat and electricity Explanation: Metals are good conductors of heat and electricity. 14 / 2014. What is the concentration of a solution containing 20 g of salt dissolved in 180 g of water? A. 10% B. 20% C. 30% D. 40% Explanation: The concentration of a solution can be calculated using the formula: (mass of solute / mass of solution) x 100. In this case, the mass of the solute (salt) is 20 g, and the mass of the solution is 200 g (20 g salt + 180 g water). So, the concentration is (20 g / 200 g) x 100 = 10%. 15 / 2015. Which of the following is an example of a colloid? A. Milk B. Saltwater C. Sand and iron filings D. Sugar dissolved in water Explanation: Milk is a colloid because it contains tiny droplets of fat dispersed throughout the water, and these droplets scatter light, exhibiting the Tyndall effect. 16 / 2016. Which of the following is an example of a compound? A. Carbon dioxide B. Iron C. Oxygen D. Air Explanation: Carbon dioxide is a compound because it is composed of two elements, carbon and oxygen, chemically combined in a fixed proportion. 17 / 2017. Which of the following is NOT a pure substance? A. Mixture B. Element C. All of the above D. Compound Explanation: A pure substance consists of only one type of particle, either an element or a compound. A mixture contains more than one substance mixed in any proportion. 18 / 2018. Which of the following is an example of a heterogeneous mixture? A. Lemonade B. Saltwater C. Air D. Sand and water Explanation: A heterogeneous mixture has a non-uniform composition, meaning the components are not evenly distributed. In sand and water, the sand particles are clearly distinguishable from the water. 19 / 2019. What is an alloy? A. A suspension B. A compound C. A pure substance D. A solid solution of two or more metals or a metal and a non-metal Explanation: An alloy is a mixture of two or more metals, or a metal and a non-metal, that cannot be separated into their components by physical methods. 20 / 2020. Which of the following is NOT a property of a solution? A. Solute particles cannot be separated by filtration B. Path of light is visible C. Homogeneous mixture D. Stable Explanation: The particles in a solution are too small to scatter light, so the path of light is not visible. 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