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Main Subjects MCQs With Answers
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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
What technology uses sound waves, often underwater, to detect objects and measure depth?
AX-ray imaging
BSonar
CInfrared imaging
DRadar
Which technique is commonly used to separate insoluble solid particles from a liquid, such as separating sand from water?
ADistillation
BEvaporation
CElectrolysis
DFiltration
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
What type of wave is primarily used in medical ultrasound imaging, such as prenatal scans?
AHigh-frequency sound waves beyond human hearing
BRadio waves
CGamma rays
DVisible light waves
What is the process called in which an electric current is passed through a compound to break it down into its elements, such as splitting water into hydrogen and oxygen?
AFermentation
BDistillation
CNeutralization
DElectrolysis
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
X-rays, commonly used to image bones and detect fractures, were first discovered by which scientist?
AAlbert Einstein
BMarie Curie
CIsaac Newton
DWilhelm Roentgen
In aerobic cellular respiration, glucose and oxygen are converted into which products, releasing energy for the cell to use?
ANitrogen and hydrogen
BOnly water
COnly oxygen
DCarbon dioxide, water, and energy
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