MCQ Chapter 17 General Science Class 8 Maharashtra Board MCQ For All Chapters – General Science Class 8Man made Materials 1. What is a key characteristic of thermosetting plastic?It can be reshaped on heatingIt is lightweightIts shape cannot be changed after moldingIt is degradableQuestion 1 of 202. Why is glass considered non-degradable?It corrodes easilyIt does not decompose naturallyIt is lightweightIt absorbs waterQuestion 2 of 203. Which type of plastic is used for manufacturing lenses?PolyacrylicPVCTeflonPolypropyleneQuestion 3 of 204. What is the primary use of lead glass?Laboratory glasswareLight bulbsMedicine bottlesSpectaclesQuestion 4 of 205. Why does glass crack when cooled quickly?It is a good conductor of heatIt is a slow conductor of heatIt is transparentIt is brittleQuestion 5 of 206. What is the purpose of adding discarded glass in glass production?To increase transparencyTo lower the melting temperatureTo add colorTo make it degradableQuestion 6 of 207. Which of the following is a use of thermocol in daily life?Making lensesPacking delicate itemsCoating vehiclesStoring chemicalsQuestion 7 of 208. What is a disadvantage of using thermocol plates in mass feasts?They are heavyStyrene may dissolve in reheated foodThey degrade quicklyThey are expensiveQuestion 8 of 209. Which oxide is mixed to produce bluish-green glass?Copper oxideFerrous oxideLead oxideBarium oxideQuestion 9 of 2010. What is the main ingredient in borosilicate glass besides sand?Lead oxideBoric acidMagnesium oxideSodaQuestion 10 of 2011. Why is plastic considered an environmental pollutant?It is degradableIt is non-degradableIt conducts electricityIt is transparentQuestion 11 of 2012. What is the primary function of optical glass?Storing medicinesMaking light bulbsProducing spectacles and lensesLaboratory glasswareQuestion 12 of 2013. What happens to the glass mixture after heating to 1500 ºC?It becomes crystallineIt is immediately cooledIt turns opaqueIt degradesQuestion 13 of 2014. Which material is used in microwave oven cookware?ThermocolPlasticGlassLeadQuestion 14 of 2015. What is a health risk for workers in thermocol factories?Miscarriage in pregnant womenImproved eyesightWeight gainBetter respiratory healthQuestion 15 of 2016. Which type of glass is used to store medicines?Silica glassBorosilicate glassAlkali silicate glassLead glassQuestion 16 of 2017. What is the role of magnesium oxide in glass production?It adds colorIt is a minor ingredient in the mixtureIt increases the melting pointIt makes glass degradableQuestion 17 of 2018. Why is silica glass resistant to acid and alkali?It expands on heatingIt contains only silicaIt is water-solubleIt is coloredQuestion 18 of 2019. What is a common use of PVC mentioned in the document?Making lensesManufacturing toysCoating vehiclesPacking delicate itemsQuestion 19 of 2020. Which of the following is a processed glass type?Soda-lime glassReinforced glassLead glassOptical glassQuestion 20 of 20 Loading...
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