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Which vitamin deficiency causes night blindness?

AVitamin B

BVitamin C

CVitamin D

DVitamin A

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What causes the tides on Earth?

AWind

BMoon's gravity

CEarth's rotation

DSun's heat

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Which element is a non-metal but is a good conductor of electricity (used in pencils)?

ASulfur

BSilicon

CGraphite

DPhosphorus

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What is the common name for sodium bicarbonate?

ATable Salt

BBaking Soda

CBleach

DWashing Soda

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Which metal is the best conductor of electricity?

AGold

BSilver

CCopper

DAluminum

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Which organ produces insulin in the human body?

ASpleen

BGallbladder

CPancreas

DLiver

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What is the study of celestial objects and phenomena called?

AAstrology

BCosmology

CGeology

DAstronomy

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Which scientist proposed the theory of general relativity?

ANikola Tesla

BGalileo Galilei

CAlbert Einstein

DIsaac Newton

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What is the chemical formula for common salt?

ANaCl

BKCl

CCaCl2

DNa2CO3

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Which light color has the longest wavelength?

ABlue

BViolet

CGreen

DRed

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