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Osteoporosis is a medical condition characterized by what change to a person’s bones?
ABones growing excessively large
BBones fusing together permanently
CBones becoming unusually flexible and rubbery
DBones becoming weak, brittle, and more prone to fracture
What term describes the period of time between when a person is exposed to an infectious pathogen and when symptoms of the disease first appear?
ARecovery period
BContagious window only
CQuarantine period
DIncubation period
Why do stars appear to twinkle when viewed from Earth’s surface?
AStars physically flicker on and off
BHuman eyes cannot properly focus on distant light
CStarlight bends as it passes through Earth's constantly moving atmosphere
DStars are actually much closer than they appear
What term describes compounds made up entirely of hydrogen and carbon atoms, such as those found in fuels like petrol and natural gas?
ACarbohydrates
BHalides
CHydrocarbons
DAmino acids
What term describes a chemical reaction that releases heat energy into its surroundings, such as combustion?
AExothermic reaction
BEndothermic reaction
CNeutralization reaction only
DCatalytic reaction only
What is the approximate acceleration due to gravity near Earth’s surface?
A22 meters per second squared
B9.8 meters per second squared
C1.6 meters per second squared
D100 meters per second squared
What causes the loud noise known as a sonic boom?
AAn object traveling faster than the speed of sound
BTwo clouds colliding
CAn object suddenly stopping completely
DA sudden drop in air pressure
Ethanol, the type of alcohol found in beverages and used in hand sanitizers, is commonly produced through which biological process?
AElectrolysis of salt water
BFermentation of sugars by yeast
CDistillation of water
DCombustion of hydrocarbons
Sound waves are classified as which type of wave, based on how particles move relative to the wave’s direction of travel?
ALongitudinal waves
BTransverse waves
CStanding waves only
DElectromagnetic waves
According to Newton’s law of universal gravitation, the gravitational force between two objects depends on what factors?
ATheir speed alone
BTheir color and temperature
CTheir exact chemical composition only
DTheir masses and the distance between them