Consider the following statements :

I. Mercury has the fastest orbital motion

II. Mars requires 687 days to complete one revolution

III. Saturn is the fifth planet from the sun.

Which of the statement(s) is/are correct?

Question

Question

This question was previously asked in

TNPSC Group 4 Official Paper 2012 (Held on: 07 Jul 2012)

Answer 1

The correct answer is 2) I and II.

Key Points

Mercury indeed has the fastest orbital motion in the Solar System due to its proximity to the Sun, completing a revolution in about 88 Earth days.
Mars requires approximately 687 Earth days to complete one revolution around the Sun, which corresponds to one Martian year.
Saturn, however, is incorrectly referred to as the fifth planet from the Sun in the statement. It is actually the sixth planet from the Sun, following Jupiter.
The correct order of the planets from the Sun is Mercury, Venus, Earth, Mars, Jupiter, and then Saturn, making the third statement incorrect.

Additional Information

The orbital speed of a planet decreases as the distance from the Sun increases, following Kepler's laws of planetary motion.
Jupiter is the fifth planet from the Sun, acting as a massive "guardian" by influencing the orbits of comets and asteroids with its strong gravitational field.
Each planet's orbit around the Sun is elliptical, with the Sun located at one of the two foci of the ellipse, as described by the first law of Kepler.