MCQ Chapter 15 General Science Class 7 Maharashtra Board MCQ For All Chapters – General Science Class 7Materials we Use 1. What is meant by a natural material? A substance produced by chemical processing A substance found in nature A man-made substance A synthetic detergentQuestion 1 of 202. Which of the following is a man-made substance? Neem twigs Toothpaste Coal powder Soap nutQuestion 2 of 203. What were neem twigs used for in olden times in India? Making soap Cleaning teeth Construction Washing clothesQuestion 3 of 204. What is the primary function of calcium carbonate in toothpaste? Prevents tooth decay Removes dirt and polishes teeth Strengthens bones Adds flavorQuestion 4 of 205. What substance in toothpaste helps prevent tooth decay? Calcium carbonate Fluoride Soap ChalkQuestion 5 of 206. What was toothpaste made from before 500 BC in countries like China and Greece? Soap and water Powder of bones and shells Chalk-like material Animal fatQuestion 6 of 207. When did Colgate first produce commercial toothpaste? 1756 1873 2000 years ago 19th centuryQuestion 7 of 208. What does the word "detergent" mean in Latin? To clean To wipe away To mix To polishQuestion 8 of 209. Which natural detergent contains saponin? Soap Toothpaste Soap nut Washing sodaQuestion 9 of 2010. What happens when you add detergent to a mixture of oil and water? Oil sinks to the bottom The mixture becomes homogeneous Water evaporates Oil remains separateQuestion 10 of 2011. Why does soap help clean oily clothes? It dissolves water It holds both oil and water molecules It evaporates oil It polishes the surfaceQuestion 11 of 2012. What is surface activity? The ability to form lather The property of spreading on a surface The process of making soap The strength of a materialQuestion 12 of 2013. Which of the following is a surfactant? Toothpaste Detergent Cement Coal powderQuestion 13 of 2014. What is soap chemically defined as? A calcium salt A sodium or potassium salt of fatty acids A fluoride compound A synthetic detergentQuestion 14 of 2015. Which type of soap is used for washing clothes? Soft soap Hard soap Liquid soap Synthetic soapQuestion 15 of 2016. What happens to soap in hard water? It forms lather easily It loses its cleansing property and forms scum It becomes more effective It dissolves completelyQuestion 16 of 2017. What is a key advantage of synthetic detergents over soap? They are natural They can be used in hard water They are cheaper to produce They form more scumQuestion 17 of 2018. What raw material is commonly used to produce synthetic detergents? Animal fat Kerosene Neem twigs Calcium carbonateQuestion 18 of 2019. What is added to detergents to give them specific properties? Fluoride Supporting additives like perfumes Calcium carbonate Coal powderQuestion 19 of 2020. In the soap-making process described, what is mixed with coconut oil? Salt water Sodium hydroxide solution Perfume OilQuestion 20 of 20 Loading...
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