MCQ Chapter 14 General Science Class 7 Maharashtra Board MCQ For All Chapters – General Science Class 7Elements, Compounds and Mixtures 1. Which of the following is a mixture?SaltBhajani mixtureHydrogenSilverQuestion 1 of 202. What is the symbol for iron?FeCuZnSiQuestion 2 of 203. What is the molecular formula of sodium chloride?HClNaClH2SO4CH4Question 3 of 204. Why is buttermilk churned to get butter?To evaporate waterTo separate solids by centrifugationTo dissolve sugarTo heat the mixtureQuestion 4 of 205. Why do ingredients in chromatography rise to limited heights?Water stops risingDifferent solubility and sticking propertiesPaper shrinksInk evaporatesQuestion 5 of 206. What property of non-metals distinguishes them from metals?High densityLack of lusterConductivityMalleabilityQuestion 6 of 207. What is a key difference between mixtures and compounds?Mixtures have fixed proportionsCompounds have no chemical changeMixtures form new substancesCompounds involve chemical combinationQuestion 7 of 208. What is the smallest particle of a compound?AtomMoleculeElementIonQuestion 8 of 209. Which method separates immiscible liquids?DistillationSeparating funnelCentrifugationChromatographyQuestion 9 of 2010. Which element is used in electric bulb wires?CopperTungstenSilverGoldQuestion 10 of 2011. What is the symbol for chlorine?CClSPQuestion 11 of 2012. Which of the following is a metalloid?IronSulphurSiliconOxygenQuestion 12 of 2013. What happens when magnesium is burned?It melts onlyIt changes into a new substanceIt evaporatesIt remains unchangedQuestion 13 of 2014. Which mixture is an example of adulteration?SherbetBhelContaminated foodSalt waterQuestion 14 of 2015. What method separates iron filings from a mixture?DistillationCombing with a magnetFiltrationCentrifugationQuestion 15 of 2016. What is the purpose of distillation?To mix liquidsTo purify impure liquidsTo dissolve solidsTo heat compoundsQuestion 16 of 2017. Which element is combustible?OxygenHydrogenNitrogenCarbon dioxideQuestion 17 of 2018. What precaution is necessary when using a separating funnel?Heat the mixtureKeep the stopcock closed initiallyShake vigorouslyUse a filterQuestion 18 of 2019. Where is centrifugation used in everyday life?Cooking foodChurning buttermilkFiltering waterMixing paintsQuestion 19 of 2020. Which property of water is seen in distillation?FreezingVaporization and condensationDissolving solidsColor changeQuestion 20 of 20 Loading...
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