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Main Subjects MCQs With Answers
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What is the primary cause of ocean acidification?
AOil spills in oceans
BAbsorption of atmospheric carbon dioxide by oceans
CPlastic pollution
DAgricultural fertilizer runoff
In an ecological food chain, decomposers typically belong to which groups?
AInsects and birds
BBacteria and fungi
CAlgae and mosses
DViruses and protozoa
Which atmospheric gas forms the largest percentage of Earth’s air volume?
AOxygen
BCarbon dioxide
CNitrogen
DArgon
Which planet in our solar system is known as the ‘Red Planet’?
AVenus
BMars
CJupiter
DMercury
What process powers the Sun and other stars?
ANuclear fission
BNuclear fusion
CChemical combustion
DRadioactive decay
A light-year is a unit used to measure:
ATime
BDistance
CLight intensity
DVelocity
Which planet in our solar system has the most extensive and visible ring system?
AJupiter
BSaturn
CUranus
DNeptune
What causes the occurrence of solar eclipses on Earth?
AEarth passes between Sun and Moon
BMoon passes between Earth and Sun
CSun passes between Earth and Moon
DVenus passes between Earth and Sun
Which astronomical object was reclassified as a ‘dwarf planet’ by the IAU in 2006?
ACeres
BPluto
CEris
DMakemake
Halley’s Comet orbits the Sun approximately once every how many years?
A25 years
B50 years
C76 years
D100 years