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Main Subjects MCQs With Answers
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What term describes the point in an object where its entire weight can be considered to act, and which affects the object’s stability?
AFocal point
BCenter of gravity
CPivot point only
DTerminal point
What is the name of the green pigment found in plant leaves that absorbs light energy for photosynthesis?
AChlorophyll
BHemoglobin
CMelanin
DCarotene
Overexposure to which type of radiation from the sun is the primary cause of sunburn and increased skin cancer risk?
ARadio waves
BInfrared radiation
CUltraviolet radiation
DMicrowave radiation
Which simple machine is essentially a thin, wedge-shaped object with a sharp edge, commonly used to cut or split materials apart?
ALever
BWedge
CPulley
DWheel and axle
Calcium carbonate is the main chemical component of which common natural materials?
APetroleum and coal
BRubber and plastic
CTable salt and sugar
DChalk, limestone, and marble
Infrared radiation, though invisible to the human eye, is commonly used in which everyday household device?
AWi-Fi routers
BBluetooth speakers
CRegular incandescent light switches
DTelevision remote controls
Which simple machine is essentially an inclined plane wrapped in a spiral around a central cylinder?
APulley
BLever
CScrew
DWedge
What is the common name for calcium oxide, a chemical compound produced by heating limestone and widely used in cement and construction?
ABaking soda
BSlaked lime
CQuicklime
DTable salt
A microwave oven heats food primarily by causing which molecules within the food to vibrate rapidly?
AProtein molecules only
BFat molecules only
CWater molecules
DSalt molecules only
What term describes the repetition of a sound caused by sound waves reflecting off a distant surface, such as a canyon wall?
AEcho
BDiffusion
CInterference
DResonance