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Main Subjects MCQs With Answers
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What is the main raw material used to manufacture ordinary glass?
AClay
BSalt
CSilica, or sand
DLimestone
Which digestive enzyme, found in saliva, begins breaking down starch in the mouth?
ALipase
BTrypsin
CAmylase
DPepsin
What is the primary purpose of a lightning rod installed on tall buildings?
ATo provide a safe, low-resistance path for lightning current to reach the ground
BTo generate electricity from storms
CTo predict when lightning will strike
DTo attract more lightning strikes for research purposes
Which of the following is a typical physical property of most non-metals?
AExcellent conductors of electricity
BAlways found as liquids at room temperature
CPoor conductors of electricity and often brittle if solid
DMalleable and shiny
What is the main raw material used in the manufacturing of cement?
ALimestone
BSodium chloride
CSilica sand
DSulfur
Which digestive enzyme, active in the acidic environment of the stomach, primarily breaks down proteins?
ALactase
BLipase
CAmylase
DPepsin
What is the key difference between alternating current (AC) and direct current (DC)?
AAC periodically reverses direction, while DC flows in only one direction
BAC only exists in batteries, while DC only exists in power lines
CAC and DC are simply two names for the same type of current
DAC flows in only one direction, while DC periodically reverses direction
Brass, a common metal alloy used in fittings and musical instruments, is primarily made by combining which two metals?
ACopper and tin
BAluminum and magnesium
CCopper and zinc
DIron and carbon
What do the letters N, P, and K represent on a common fertilizer label?
ANickel, platinum, and krypton
BNitrogen, phosphorus, and potassium
CNeon, phosphorus, and potassium
DNitrogen, plastic, and kerosene
What energy conversion takes place inside a battery when it powers a device?
ALight energy into chemical energy
BElectrical energy into chemical energy
CMechanical energy into chemical energy
DChemical energy into electrical energy