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Which acid is present in lemon juice?
AAcetic acid
BCitric acid
CLactic acid
DTartaric acid
Which gas is primarily responsible for the greenhouse effect and global warming?
AOxygen
BNitrogen
CCarbon dioxide
DArgon
Rusting of iron is an example of which type of chemical process?
AReduction
BOxidation
CSublimation
DEvaporation
Which gas is used in the manufacturing of soft drinks and carbonated beverages?
AOxygen
BCarbon dioxide
CNitrogen
DHydrogen
Which element is abundant in the Earth’s crust by weight?
ASilicon
BAluminum
CIron
DOxygen
What process converts liquid directly into gas below its boiling point?
ABoiling
BEvaporation
CCondensation
DSublimation
Why does a swimming pool appear less deep than it actually is?
AReflection of light
BRefraction of light
CDiffraction of light
DAbsorption of light
Sound travels fastest in which of the following media?
AVacuum
BAir
CWater
DSteel
What is the primary heat transfer mechanism by which thermal energy from the Sun reaches the Earth?
AConduction
BConvection
CRadiation
DAdvection
What type of mirror is commonly used as a rearview mirror in motor vehicles?
APlane mirror
BConcave mirror
CConvex mirror
DParabolic mirror