MCQs Archive - Page 1005 of 1097

What is a primary function of the spleen in the human body?

AProducing digestive enzymes

BFiltering blood and removing old or damaged red blood cells

CProducing sound for the voice

DRegulating body temperature

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What blood pressure reading is generally considered a typical healthy value for a resting adult?

A180/120 mmHg

B90/40 mmHg

C120/80 mmHg

D220/140 mmHg

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How many teeth does a typical full set of adult human permanent teeth include?

A28

B20

C36

D32

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How does a universal indicator differ from simple litmus paper when testing pH?

AIt changes color based on temperature rather than pH

BIt shows a gradual range of colors corresponding to different pH values across the scale

CIt only ever shows a single fixed color regardless of pH

DIt can only detect acids, never bases

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On the pH scale, substances like soap and baking soda that are basic, or alkaline, typically have a pH value that is what?

AExactly 7

BAlways exactly 14

CBelow 7

DAbove 7

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What is the correct order of the main stages in the water cycle, describing how water moves between the atmosphere and Earth’s surface?

AFermentation, saponification, and electrolysis

BOxidation, reduction, and neutralization

CCombustion, filtration, and distillation

DEvaporation, condensation, and precipitation

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Which element, with the atomic number 1, is the lightest and most abundant element in the universe?

AHydrogen

BOxygen

CHelium

DNitrogen

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The depletion of the ozone layer in the upper atmosphere has been strongly linked to the release of which class of chemicals?

ANitrogen gas

BPure carbon dioxide

CChlorofluorocarbons (CFCs)

DTable salt particles

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Acid rain, which can damage forests, buildings, and aquatic ecosystems, is primarily caused by which type of air pollutants?

ACarbon monoxide alone

BExcess water vapor with no pollutants involved

CSulfur dioxide and nitrogen oxides reacting with atmospheric water vapor

DExcess oxygen in the atmosphere

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What term describes the mixture of smoke and fog that reduces visibility and air quality in polluted urban areas?

AHaze storm

BFrost

CSmog

DAcid mist

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