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Main Subjects MCQs With Answers
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Which element has the chemical symbol Na?
ANitrogen
BNeon
CSodium
DNickel
Which everyday device converts electrical energy into mechanical energy using electromagnetism?
ATransformer
BElectric motor
CBattery
DCapacitor
Which chemical is commonly added to drinking water supplies to kill harmful bacteria and pathogens?
ASodium chloride
BChlorine
CAmmonia
DCalcium carbonate
How many bones are typically found in an adult human skeleton?
A226
B246
C206
D186
What is the smallest bone in the human body, and where is it located?
AThe patella, in the knee
BThe phalanges, in the fingers
CThe clavicle, in the shoulder
DThe stapes, in the middle ear
Why does the sky appear blue during a clear day?
AThe sky reflects the color of the ocean
BBlue light is scattered more than other colors by the atmosphere
CBlue light travels slower through air
DThe sun emits mostly blue light
What is the chemical name for common table salt?
APotassium nitrate
BSodium bicarbonate
CCalcium carbonate
DSodium chloride