2003 General Studies, all questions

UPSC Prelims 2003 · General Studies

Question 126: Geography

Among the following which planet takes maximum time for one revolution around the Sun?

aEarth
bJupiter
cMars
dVenus

AnswerThe answer is (b).

The time for one revolution around the Sun rises with distance from the Sun (Kepler's third law: the square of the period is proportional to the cube of the orbit size). Jupiter, the farthest of the four at about 5.2 AU, takes about 11.86 years; Mars takes about 1.88 years, Earth one year and Venus about 225 days.

Why each option is right or wrong
  • (a) Earth takes one year.
  • (b) Correct: Jupiter, about 11.9 years.
  • (c) Mars takes about 1.9 years.
  • (d) Venus takes about 225 days.

Explanation: written by UPSC Grade, not by UPSC.

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Source: UPSC, Civil Services (Preliminary) Examination 2003, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.