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What optical phenomenon, in which light is completely reflected within a denser medium, forms the basis of fiber-optic communication?
ATotal internal reflection
BPolarization
CDispersion
DDiffraction
What formula is used to calculate the density of a substance?
ADensity equals mass multiplied by volume
BDensity equals mass divided by volume
CDensity equals volume divided by mass
DDensity equals mass minus volume
What key advantage do synthetic detergents generally have over traditional soap?
ADetergents work effectively even in hard water, unlike soap
BDetergents are edible while soap is not
CDetergents are always cheaper to produce
DDetergents never produce any foam
Which method of heat transfer involves the movement of heated fluid, such as warm air or water, from one place to another?
ARadiation
BConvection
CConduction
DReflection
What is the key difference between an object’s mass and its weight?
AWeight is constant everywhere, while mass depends on gravity
BMass is measured in newtons, while weight is measured in kilograms
CMass and weight are exactly the same thing
DMass is constant everywhere, while weight depends on the local strength of gravity
Fractional distillation of crude petroleum separates it into various products mainly based on differences in what property?
AColor
BSmell
CBoiling point
DDensity alone
What blood pressure reading is generally considered a typical healthy value for a resting adult?
A180/120 mmHg
B90/40 mmHg
C120/80 mmHg
D220/140 mmHg
Which method of heat transfer occurs through direct contact between particles, and works best in solids like metals?
ARadiation
BConvection
CEvaporation
DConduction
In chemistry, what is a pure substance made up of only one type of atom called?
AA mixture
BAn element
CA solution
DA compound