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Bronze, historically significant enough to give its name to an entire age of human history, is primarily an alloy of which two metals?
AIron and nickel
BZinc and lead
CCopper and tin
DCopper and zinc
Why is carbon monoxide gas particularly dangerous to breathe in enclosed spaces?
AIt instantly freezes lung tissue
BIt binds to hemoglobin in the blood much more strongly than oxygen does, blocking oxygen transport
CIt has a strong, easily noticeable odor that causes headaches
DIt is highly flammable and explosive on contact with skin
What energy conversion takes place inside an electrical generator?
AMechanical energy into electrical energy
BElectrical energy into mechanical energy
CChemical energy into light energy
DHeat energy into chemical energy
What causes water to be classified as hard water?
AExtremely low temperature
BThe presence of dissolved calcium and magnesium salts
CThe presence of dissolved oxygen only
DThe presence of dissolved sugar
What term describes the mixture of smoke and fog that reduces visibility and air quality in polluted urban areas?
AHaze storm
BFrost
CSmog
DAcid mist
What technology uses radio waves to detect the distance, speed, and direction of objects like aircraft?
ARadar
BSonar
CLidar using sound
DUltrasound
Which purification technique separates a mixture of liquids based on differences in their boiling points?
AFiltration
BChromatography
CDecantation
DDistillation
Acid rain, which can damage forests, buildings, and aquatic ecosystems, is primarily caused by which type of air pollutants?
ACarbon monoxide alone
BExcess water vapor with no pollutants involved
CSulfur dioxide and nitrogen oxides reacting with atmospheric water vapor
DExcess oxygen in the atmosphere
What technology uses sound waves, often underwater, to detect objects and measure depth?
AX-ray imaging
BSonar
CInfrared imaging
DRadar
Which technique is commonly used to separate insoluble solid particles from a liquid, such as separating sand from water?
ADistillation
BEvaporation
CElectrolysis
DFiltration