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Which planet is referred to as Earth’s ‘Twin’ due to similar size and mass?

AMars

BVenus

CMercury

DNeptune

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Halley’s Comet orbits the Sun approximately once every how many years?

A25 years

B50 years

C76 years

D100 years

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Which astronomical object was reclassified as a ‘dwarf planet’ by the IAU in 2006?

ACeres

BPluto

CEris

DMakemake

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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

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Which planet in our solar system has the most extensive and visible ring system?

AJupiter

BSaturn

CUranus

DNeptune

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A light-year is a unit used to measure:

ATime

BDistance

CLight intensity

DVelocity

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What process powers the Sun and other stars?

ANuclear fission

BNuclear fusion

CChemical combustion

DRadioactive decay

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Which planet in our solar system is known as the ‘Red Planet’?

AVenus

BMars

CJupiter

DMercury

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Which atmospheric gas forms the largest percentage of Earth’s air volume?

AOxygen

BCarbon dioxide

CNitrogen

DArgon

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In an ecological food chain, decomposers typically belong to which groups?

AInsects and birds

BBacteria and fungi

CAlgae and mosses

DViruses and protozoa

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