MCQ 11 MarkWhich of these processes is used in a town water supply to kill germs in water?ASedimentationBFiltrationCBoilingDChlorinationAnswerSELFView full question & answer→
MCQ 21 MarkWhich of these can be used to remove soluble impurities from water?ADistillationBFiltrationCSedimentationDDecantationAnswerSELFView full question & answer→
MCQ 31 MarkWhich of these works because of air pressure?AStrawBDropperCDoctor's syringeDAll of theseAnswerSELFView full question & answer→
MCQ 41 MarkWhich of these is not a property of air?AAir occupies spaceBAir helps burningCAir exerts pressureDAir has no weightAnswerSELFView full question & answer→
MCQ 51 MarkWhich of these gases is the most abundant in the atmosphere?AOxygenBCarbon dioxideCNitrogenDozoneAnswerSELFView full question & answer→
MCQ 61 MarkThe highest clouds are at aboutA$1 \ km$ above the surface of the earthB$15 \ km$ above the surface of the earth✓$50 \ km$ above the surface of the earthDhundreds of kilometres above the surface of the earthAnswerCorrect option: C. $50 \ km$ above the surface of the earthView full question & answer→