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What causes iron to rust when exposed to air and moisture?
AA chemical reaction with oxygen called oxidation
BExtreme cold temperatures
CA physical change only
DExposure to sunlight
Which element, when combined with iron, is essential for making the steel used in construction?
ACarbon
BHelium
CArgon
DNeon
Malaria is transmitted to humans through the bite of which insect?
AAedes mosquito
BFemale Anopheles mosquito
CHousefly
DTsetse fly
Which type of lens is used to correct farsightedness, also called hyperopia?
AConvex lens
BConcave lens
CPlano lens
DPrism lens
What is the chemical formula for baking soda?
ACaCO3
BKNO3
CNaHCO3
DNaCl
What type of chemical reaction occurs when a candle burns?
AFermentation
BNeutralization
CCombustion
DReduction only
What is the main function of a transformer in an electrical power system?
ATo change the voltage of alternating current
BTo store electrical energy
CTo generate electricity
DTo convert AC to DC
Which gas makes up the largest percentage of Earth’s atmosphere?
ANitrogen
BCarbon dioxide
COxygen
DArgon
What acid is formed when carbon dioxide dissolves in water, giving carbonated drinks their fizz?
ASulfuric acid
BAcetic acid
CCarbonic acid
DHydrochloric acid
What is the function of a fuse in an electrical circuit?
ATo store electrical charge
BTo protect the circuit by breaking it during excess current
CTo increase voltage
DTo convert electrical energy into light