CTET PAPER II 2021 · PYQ · Geography / Solar System · medium
As we move away from the sun in the solar system,
A.time taken by planets to complete one orbit around the sun increases.✓ Correct
B.time taken by planets to complete one orbit around the sun decreases.
C.size of the planets decreases gradually.
D.planets very close to the sun are made up of gases and liquids and the planets far away from the sun are made up of rocks.
Explanation
According to Kepler's third law, the orbital period of a planet increases with its distance from the Sun. So planets farther from the Sun (like Neptune) take much longer to complete one revolution than planets close to the Sun (like Mercury). The size of planets does not gradually decrease with distance — the gas giants like Jupiter and Saturn are far from the Sun and are very large. Planets close to the Sun (Mercury, Venus, Earth, Mars) are rocky, while planets far from the Sun (Jupiter, Saturn) are gaseous — the reverse of option 4.
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