MCQ Chapter 15 General Science Class 7 Maharashtra Board MCQ For All Chapters – General Science Class 7Materials we Use 1. What material is cement primarily used for in construction?CleaningMaking concretePolishing teethWashing clothesQuestion 1 of 202. What is the most commonly used type of cement?White cementPortland cementAqueous cementRoman cementQuestion 2 of 203. What is the main ingredient in Portland cement?SilicaLimeIron oxideGypsumQuestion 3 of 204. Who developed the method of making aqueous cement in 1756?ColgateJohn SmeatonRomansPortland engineersQuestion 4 of 205. What is concrete made of?Cement, water, sand, and gravelSoap and oilFluoride and calciumSodium hydroxide and fatQuestion 5 of 206. What did the Romans use to make their cement?Animal fatVolcanic ash and moistened limeSodium hydroxideChalkQuestion 6 of 207. Why are roads made of concrete nowadays?It is cheaperIt is stronger and leak-proofIt is easier to produceIt forms latherQuestion 7 of 208. What causes soap to lose its cleansing property in hard water?Formation of latherFormation of scumMixing with oilEvaporationQuestion 8 of 209. Which of the following is a natural substance used for cleaning teeth in olden times?ToothpasteAcacia barkSynthetic detergentFluorideQuestion 9 of 2010. What is the role of salt in the soap-making process?Adds fragranceHelps the soap float and thickenPrevents boilingCleans the mixtureQuestion 10 of 2011. What is a key difference between hard soap and soft soap?Hard soap is potassium-basedSoft soap is used for washing clothesHard soap does not cause skin irritationSoft soap is a sodium saltQuestion 11 of 2012. What is the source of fluoride in toothpaste?Calcium carbonateAdded as an ingredientNatural waterSoap nutQuestion 12 of 2013. Why does oil float on water without detergent?Oil is heavierOil and water do not mixWater evaporatesOil dissolvesQuestion 13 of 2014. What was used to make soap 2000 years ago?Coconut oilAnimal fat and wood ashSodium hydroxideKeroseneQuestion 14 of 2015. Which detergent is safe for silk and woolen clothes?Soap nutHard soapSynthetic detergentWashing sodaQuestion 15 of 2016. What is magnesia in cement?Calcium oxideMagnesium oxideSilicon dioxideIron oxideQuestion 16 of 2017. What happens if cement is not used in concrete?It becomes strongerIt loses binding strengthIt forms latherIt becomes oilyQuestion 17 of 2018. Which substance was used in 19th-century toothpaste?SoapFluorideBonesChalkQuestion 18 of 2019. What is the texture of Portland cement named after?Roman concreteStone from the Isle of PortlandVolcanic ashChalkQuestion 19 of 2020. What should a detergent for delicate garments do?Form scumBe harsh on fabricNot harm the fabricOnly work in hard waterQuestion 20 of 20 Loading...
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