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What is the key difference between an antiseptic and a disinfectant?
AThere is no meaningful difference between the two terms
BAntiseptics are used on living tissue, while disinfectants are used on non-living surfaces
CAntiseptics only work against viruses, never bacteria
DDisinfectants are used on living tissue, while antiseptics are used on non-living surfaces
In the visible light spectrum, which color has the shortest wavelength?
AViolet
BOrange
CYellow
DRed
What term describes the point in an object where its entire weight can be considered to act, and which affects the object’s stability?
AFocal point
BCenter of gravity
CPivot point only
DTerminal point
What is the name of the green pigment found in plant leaves that absorbs light energy for photosynthesis?
AChlorophyll
BHemoglobin
CMelanin
DCarotene
Overexposure to which type of radiation from the sun is the primary cause of sunburn and increased skin cancer risk?
ARadio waves
BInfrared radiation
CUltraviolet radiation
DMicrowave radiation
Which simple machine is essentially a thin, wedge-shaped object with a sharp edge, commonly used to cut or split materials apart?
ALever
BWedge
CPulley
DWheel and axle
Calcium carbonate is the main chemical component of which common natural materials?
APetroleum and coal
BRubber and plastic
CTable salt and sugar
DChalk, limestone, and marble
Infrared radiation, though invisible to the human eye, is commonly used in which everyday household device?
AWi-Fi routers
BBluetooth speakers
CRegular incandescent light switches
DTelevision remote controls
Which simple machine is essentially an inclined plane wrapped in a spiral around a central cylinder?
APulley
BLever
CScrew
DWedge
What is the common name for calcium oxide, a chemical compound produced by heating limestone and widely used in cement and construction?
ABaking soda
BSlaked lime
CQuicklime
DTable salt