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Question

Which is the smallest planet in the solar system?

This question was previously asked in
TNPSC Group 2 2026 Prelims Question Paper (01-Nov-2026)
The correct answer is

Mercury

The solar system has eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Since Pluto was reclassified as a dwarf planet in 2006, the smallest of the eight is Mercury.

Mercury has a diameter of about 4,880 km, which is smaller than every other planet and even smaller than Jupiter’s moon Ganymede and Saturn’s moon Titan. It is also the planet closest to the Sun.

The Sun is a star, not a planet, and is by far the largest body in the solar system. Earth (about 12,742 km across) and Venus (about 12,104 km across) are almost equal in size and are much larger than Mercury.

Mercury option is correct.

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Important Questions from Origin and evolution of Universe Solar system

  1. A huge collection of gas, dust and billions of stars is called a:

  2. The Greenwich Mean Time is the local time at :

  3. The force exerted by rotation of the earth is known as:

  4. How many hours is one solar day

  5. Moon changes its shape everyday due to:

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