MCQ Chapter 3 General Science Class 7 Maharashtra Board MCQ For All Chapters – General Science Class 7Properties of Natural Resources 1. Which gases are present in air, making it a homogeneous mixture?Oxygen and Nitrogen onlyA mixture of gases like oxygen, nitrogen, and othersCarbon dioxide onlyWater vapor onlyQuestion 1 of 202. Why is air called a homogeneous mixture?Because it has different colorsBecause its components are uniformly mixedBecause it is visible to the naked eyeBecause it contains only one gasQuestion 2 of 203. What can be inferred from the balloon experiment with the stick?Air has no weightAir has mass and weightBalloons are heavier than airThe stick has no massQuestion 3 of 204. What happens when you pull the piston of a syringe with the inlet hole closed?The piston stays in placeThe piston moves out easilyThe air pressure inside increasesThe piston is pushed back in when releasedQuestion 4 of 205. What is atmospheric pressure measured with?A thermometerA barometerA syringeA balloonQuestion 5 of 206. What happens to atmospheric pressure as you go higher above sea level?It increasesIt remains the sameIt decreasesIt doublesQuestion 6 of 207. Who proposed the principle that air pressure decreases when its velocity increases?SorensenDaniel BernoulliNewtonGalileoQuestion 7 of 208. Why does water form a fountain when you blow through a straw near another straw?The water evaporatesAir pressure at the straw’s end decreasesThe straw heats the waterThe water’s density increasesQuestion 8 of 209. What causes water droplets to appear on the outside of a glass with ice cubes?The glass leaksWater vapor in the air condensesThe ice melts quicklyThe air heats upQuestion 9 of 2010. What is dew?Frozen waterExcess water vapor turning into dropletsRainwater collected on surfacesMelted iceQuestion 10 of 2011. Why do wet clothes dry faster in summer than in the rains?The air is colder in summerThe air’s capacity to hold moisture increases in summerRain increases humidityBoth B and CQuestion 11 of 2012. What property of air is demonstrated by dipping an uncorked bottle into water?Air has weightAir occupies spaceAir has no volumeAir is invisibleQuestion 12 of 2013. What happens to a balloon when air is filled in it?It shrinksIt expandsIt floats immediatelyIt loses weightQuestion 13 of 2014. What natural phenomenon scatters light in all directions due to air particles?ReflectionRefractionScattering of lightAbsorptionQuestion 14 of 2015. How does air help regulate Earth’s temperature?By reflecting sunlightBy absorbing and distributing heatBy cooling the surfaceBy blocking all heatQuestion 15 of 2016. Why can we hear a train whistle clearly early in the morning in winter?Air density is lowerAir density increasesSound travels slowerThe train is closerQuestion 16 of 2017. In which state does water occur under ordinary conditions?SolidLiquidGasPlasmaQuestion 17 of 2018. What happens to water’s volume when it freezes into ice?It decreasesIt remains the sameIt increasesIt doublesQuestion 18 of 2019. Why does ice float on water?Ice is denser than waterIce is lighter than waterWater evaporates under iceIce has no massQuestion 19 of 2020. What is the density of water if 1 liter has a mass of 1 kilogram?1 g/cc2 g/cc0.5 g/cc10 g/ccQuestion 20 of 20 Loading...
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