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Which technology relies on signals from a network of orbiting satellites to determine a device’s precise geographic location?
AWi-Fi
BGPS, or the Global Positioning System
CSonar
DRadar
Why do astronauts aboard the International Space Station experience apparent weightlessness, even though Earth’s gravity is still acting on them?
ABecause there is no gravity at all in space
BBecause astronauts wear special anti-gravity suits
CBecause the station and its occupants are continuously falling around Earth in orbit, creating a state of continuous free fall
DBecause the station generates artificial zero gravity fields
What term describes an alloy, historically used in dental fillings, that is formed by combining mercury with another metal?
ASolder only
BBrass
CBronze
DAmalgam
What is a geostationary satellite, commonly used for communications and weather monitoring?
AA satellite that orbits the moon rather than Earth
BA satellite that only operates during nighttime
CA satellite that remains fixed at a single point relative to Earth's surface because its orbital speed matches Earth's rotation
DA satellite that never orbits Earth at all
What instrument measures altitude, or height above a reference point such as sea level, often based on changes in atmospheric air pressure?
AAltimeter
BHygrometer
CSeismograph
DAnemometer
Paper chromatography, a simple laboratory technique often used to separate the different pigments in ink, works based on what general principle?
ADifferent substances moving at different rates through a paper medium as a solvent travels through it
BAdding a strong acid to dissolve unwanted components
CFreezing substances to separate them by density
DBoiling different substances at different temperatures
A household refrigerator keeps food cold primarily by using a refrigerant that repeatedly does what?
AAbsorbs heat as it evaporates inside the refrigerator, then releases that heat outside as it condenses
BGenerates electricity directly
CFreezes permanently and stays solid
DBurns to generate heat
What device combines the functions of measuring voltage, current, and resistance into a single instrument, widely used by electricians and technicians?
AAnemometer
BBarometer
CMultimeter
DSeismograph
Antacid tablets, commonly used to relieve heartburn and indigestion, work by doing what to excess stomach acid?
ANeutralizing excess stomach acid using a mild base
BIncreasing the acidity of the stomach further
CPhysically absorbing all liquid in the stomach
DConverting stomach acid directly into water only
An air conditioner cools a room using a cooling cycle that is fundamentally most similar to which other common household appliance?
AA refrigerator
BA vacuum cleaner
CA toaster
DA washing machine