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Main Subjects MCQs With Answers
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The photoelectric effect, in which light striking certain materials causes them to emit electrons, forms the basic scientific principle behind which everyday technology?
ASolar cells, or photovoltaic panels
BFire extinguishers
CRefrigerators
DVacuum flasks
In a typical food chain, which organisms are classified as producers?
AAnimals that eat both plants and animals
BPlants and other organisms that make their own food through photosynthesis
CAnimals that eat only meat
DFungi that decompose dead material
Cataracts are a common age-related eye condition involving what specific change?
AClouding of the eye's normally clear lens
BPermanent dilation of the pupil
CComplete loss of the retina
DExcessive tear production
What is the key difference between an epidemic and a pandemic?
AA pandemic is a disease outbreak that has spread across multiple countries or continents, while an epidemic is generally more localized
BAn epidemic affects a widespread global area, while a pandemic is limited to a single region
CThere is no meaningful difference between the two terms
DAn epidemic only refers to viral diseases, while a pandemic only refers to bacterial diseases
What term describes a chemical reaction that absorbs heat energy from its surroundings as it proceeds, such as photosynthesis?
AOxidation reaction only
BEndothermic reaction
CExothermic reaction
DCombustion reaction only
In an ecosystem, what role do decomposers, such as many fungi and bacteria, play?
AThey exclusively hunt and consume other living animals
BThey convert sunlight directly into electrical energy
CThey break down dead organic matter, recycling nutrients back into the environment
DThey produce their own food through photosynthesis
Jaundice, a condition causing yellowing of the skin and eyes, is typically linked to excess levels of which substance in the blood?
ACholesterol
BCalcium
CGlucose
DBilirubin
What term describes a close biological relationship between two different species in which both organisms benefit from the interaction?
AParasitism
BCompetition only
CMutualism
DPredation
Dry ice, commonly used for cooling and creating fog effects, is the solid form of which substance?
AWater
BCarbon dioxide
CNitrogen
DAmmonia
How are animals classified based on their diet into herbivores, carnivores, and omnivores?
ABy whether they eat only plants, only other animals, or a mix of both
BBy their exact size, regardless of diet
CBy whether they have a backbone
DBy whether they live on land or in water