MCQ Chapter 7 Class 7 Science Curiosity NCERT Advertisement Heat Transfer in Nature 1. Why are cooking utensils generally made of metals?They are poor conductors of heatThey are good conductors of heatThey trap airThey radiate heatQuestion 1 of 202. What is the process called when heat transfers from a hotter part to a colder part of an object?ConvectionRadiationConductionEvaporationQuestion 2 of 203. In Activity 7.1, why does the pin closest to the candle flame fall first?It is heavierHeat reaches it firstIt is made of waxIt is farther from the standQuestion 3 of 204. Which material is a poor conductor of heat?AluminiumSteelWoodIronQuestion 4 of 205. Why do woollen clothes keep us warm in winter?They conduct heatThey trap air, a poor conductor of heatThey absorb sunlightThey radiate heatQuestion 5 of 206. In Activity 7.2, why does the paper cup above the candle rise?The candle pushes itHot air inside expands and risesThe thread shrinksThe cup is lightweightQuestion 6 of 207. How is heat primarily transferred in liquids and gases?ConductionConvectionRadiationInfiltrationQuestion 7 of 208. In Activity 7.3, why does the coloured streak move up and down in the beaker?The water is stirredHeated water rises, cooler water sinksThe candle pushes the streakThe potassium permanganate settlesQuestion 8 of 209. What causes a sea breeze during the day?Cooler air moves from land to seaWarmer air rises over the seaCooler air moves from sea to landWarmer air rises over the landQuestion 9 of 2010. How does heat from the Sun reach the Earth?ConductionConvectionRadiationInfiltrationQuestion 10 of 2011. Why are light-coloured clothes preferred in summer?They absorb heatThey reflect heatThey conduct heatThey trap airQuestion 11 of 2012. Why are Himalayan house walls made of wood and mud?They conduct heatThey are poor conductors of heatThey radiate heatThey absorb heatQuestion 12 of 2013. What happens to a hot utensil kept away from a flame?It conducts heatIt radiates heatIt convects heatIt stores heatQuestion 13 of 2014. Why do hollow bricks keep houses cool in summer?They conduct heatThey trap air, a poor conductorThey radiate heatThey absorb heatQuestion 14 of 2015. In Activity 7.4, which heats faster?WaterSoilAirSandQuestion 15 of 2016. What is the movement of cooler air from land to sea at night called?Sea breezeLand breezeConductionRadiationQuestion 16 of 2017. Why does smoke from an incense stick rise?It is heavier than airIt is cooler than airIt is warmer than airIt is pushed by the flameQuestion 17 of 2018. What is the continuous movement of water through evaporation and precipitation?ConductionWater cycleRadiationInfiltrationQuestion 18 of 2019. In Activity 7.5, which material allows the fastest water seepage?ClaySandGravelSoilQuestion 19 of 2020. What is the process of surface water seeping through soil called?EvaporationInfiltrationConvectionPrecipitationQuestion 20 of 20 Loading...
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