MCQ Chapter 5 Class 7 Science Curiosity NCERT Advertisement Changes Around Us: Physical and Chemical 1. What type of change occurs when a cube of ice melts into water?Chemical changePhysical changeBoth physical and chemical changeNo changeQuestion 1 of 202. What happens to lime water when carbon dioxide is blown into it?It remains clearIt turns milkyIt evaporatesIt becomes solidQuestion 2 of 203. Which of the following is an example of a chemical change?Folding a piece of paperBurning woodCrushing chalk into powderInflating a balloonQuestion 3 of 204. What is the primary difference between physical and chemical changes?Physical changes are reversible, chemical changes are notPhysical changes form new substances, chemical changes do notPhysical changes do not form new substances, chemical changes doPhysical changes involve heat, chemical changes do notQuestion 4 of 205. What type of change is observed when a bud turns into a flower?Physical changeChemical changeNo changeBoth physical and chemical changeQuestion 5 of 206. What happens to a balloon when it is pricked with a pin after inflation?It returns to its original uninflated stateIt remains inflatedIt bursts and cannot be restoredIt slowly deflatesQuestion 6 of 207. Which of the following is a physical change?Burning magnesium ribbonChopping vegetablesRusting of ironMixing vinegar and baking sodaQuestion 7 of 208. What gas is produced when vinegar and baking soda are mixed?OxygenNitrogenCarbon dioxideHydrogenQuestion 8 of 209. What is the term for the minimum temperature at which a substance catches fire?Combustion temperatureIgnition temperatureMelting pointBoiling pointQuestion 9 of 2010. Which of the following is a combustible substance?GlassWaterKeroseneMetalQuestion 10 of 2011. What type of change occurs when wet clothes dry?Chemical changePhysical changeBoth physical and chemical changeNo changeQuestion 11 of 2012. What is formed when magnesium ribbon burns in air?Magnesium hydroxideMagnesium oxideMagnesium carbonateMagnesium sulfateQuestion 12 of 2013. What is the process called when a substance reacts with oxygen to produce heat and/or light?ErosionCombustionWeatheringEvaporationQuestion 13 of 2014. Why does a candle stop burning when covered with a glass tumbler?Lack of fuelLack of oxygenLack of heatExcess carbon dioxideQuestion 14 of 2015. What type of change is rusting of iron?Physical changeChemical changeNo changeBoth physical and chemical changeQuestion 15 of 2016. Which of the following changes can be reversed?Burning woodMelting ice cubesMaking popcorn from cornRusting of ironQuestion 16 of 2017. What is the result of focusing sunrays on paper using a magnifying glass?The paper meltsThe paper catches fireThe paper changes colorThe paper remains unchangedQuestion 17 of 2018. What type of change occurs when a piece of paper is torn?Chemical changePhysical changeBoth physical and chemical changeNo changeQuestion 18 of 2019. What is the term for the physical and chemical changes in rocks that form soil?ErosionCombustionWeatheringDecompositionQuestion 19 of 2020. Which of the following is an example of erosion?Rusting of ironSand collecting on riverbedsBurning of woodMelting of waxQuestion 20 of 20 Loading...
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