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Main Subjects MCQs With Answers
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What term describes the number of protons found in the nucleus of an atom?
AIsotope number
BMass number
CValency
DAtomic number
What process, involving heating rubber with sulfur, was developed to make natural rubber more durable and elastic?
ASaponification
BVulcanization
CFermentation
DElectrolysis
Which digestive enzyme, found in saliva, begins breaking down starch in the mouth?
ALipase
BTrypsin
CAmylase
DPepsin
How does a vacuum flask, commonly called a thermos, keep drinks hot or cold for extended periods?
ABy actively heating or cooling the liquid inside
BBy adding chemical coolants
CBy using a sealed vacuum layer that greatly reduces heat transfer
DBy constantly stirring the liquid
In chemistry, what term describes the combining capacity of an element, or how many bonds it can typically form?
ADensity
BValency
CSolubility
DMolarity
What is the main raw material used to manufacture ordinary glass?
AClay
BSalt
CSilica, or sand
DLimestone
Which digestive enzyme, active in the acidic environment of the stomach, primarily breaks down proteins?
ALactase
BLipase
CAmylase
DPepsin
What does the law of conservation of energy state?
AEnergy can be created but not destroyed
BEnergy cannot be created or destroyed, only converted from one form to another
CEnergy always increases over time
DEnergy can be destroyed but not created
What term describes the energy an object possesses because of its motion?
AKinetic energy
BPotential energy
CThermal energy
DChemical energy
What term describes stored energy an object has because of its position or condition?
ARadiant energy
BPotential energy
CKinetic energy
DSound energy