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What term describes sound waves with a frequency higher than the upper limit of typical human hearing, generally above about 20,000 hertz?
AUltrasonic sound
BResonant sound
CInfrasound
DAmplified sound only
Galileo Galilei made significant contributions to astronomy largely by improving which existing optical instrument and applying it to observe the night sky?
AThe camera
BThe telescope
CThe microscope
DThe periscope
Paraffin wax, a common material used in making candles, is primarily derived from which source?
ABeeswax exclusively
BCoral reefs
CPlant-based oils exclusively
DPetroleum processing
Unlike the ethanol found in alcoholic beverages, methanol, a similar but chemically distinct type of alcohol, is notably dangerous for what reason if accidentally consumed?
AIt has an extremely pleasant, sweet taste that causes overconsumption
BIt is completely harmless to consume in any quantity
CIt causes only very mild, brief drowsiness with no other effects
DIt is highly toxic and can cause serious health effects, including blindness or death, even in relatively small amounts
What term describes sound waves with a frequency lower than the typical lower limit of human hearing, generally below about 20 hertz?
AUltrasonic sound
BResonant sound
CInfrasound
DWhite noise only
Which astronomer is credited with formulating the laws of planetary motion, describing how planets move in elliptical orbits around the sun?
AJohannes Kepler
BGalileo Galilei
CIsaac Newton
DNicolaus Copernicus
Activated charcoal, sometimes used in certain medical and filtration contexts, is particularly valued for its ability to do what?
AConduct heat exceptionally well
BGenerate electricity
CAbsorb and trap certain toxins and impurities due to its highly porous structure
DAdd sweetness to food or drinks
Gypsum, a naturally occurring mineral primarily composed of calcium sulfate, is commonly processed to produce which widely used material?
ANatural rubber
BTable salt
CBaking soda
DPlaster of Paris
What is the SI base unit used to measure time?
ADay
BHour
CSecond
DMinute
A stethoscope, a common medical instrument, is primarily designed to do what?
ATake internal images of bones
BMeasure body temperature
CMeasure blood pressure directly
DAmplify and allow a doctor to listen to internal body sounds, such as the heartbeat