NCERT Class 6 Geography — Chapter 1: The earth in the solar system

mcqeasy

Which one of the following planets is often designated as the "Blue Planet"?

Official previous-year question

Verified 1 Aug 2026.

Options

AUranus
BVenus
CNeptune
DEarth

Did you get this right?

Solution

The correct option is

Earth

Explanation

Planetary nicknames are often derived from the visual appearance of the celestial body from space, which is influenced by its surface features and atmospheric composition.

Detailed Analysis:

Earth: It is designated as the "Blue Planet" because approximately 71% of its surface is covered by water. When viewed from outer space, the oceans reflect and scatter blue light, giving the planet a distinct blue appearance.
Neptune and Uranus: While these planets also appear blue or blue-green due to the presence of methane in their atmospheres (which absorbs red light), the specific epithet "Blue Planet" is standard terminology for Earth, highlighting its unique hydrosphere.
Venus: It appears bright yellowish-white due to thick clouds of sulfuric acid that reflect a significant amount of sunlight.

Key Takeaway: Earth is uniquely termed the "Blue Planet" due to the abundance of liquid water covering the majority of its surface.

Your note

More from Chapter 1: The earth in the solar system

Consider the following statements regarding celestial bodies: 1. All celestial bodies emit their own heat and light in large amounts. 2. Stars are celestial bodies made up of gases. 3. The Sun is a celestial body that reflects the light of other stars. Which of the statements given above is/are correct?

easy

With reference to the phases of the Moon, consider the following statements: 1. The Full Moon can be seen only once in about a month’s time. 2. The New Moon night is also known as Poornima. 3. On Amavasya, the night sky can be watched best if it is a clear night. Which of the statements given above is/are correct?

medium

Which one of the following star groups is a recognizable part of the Ursa Major constellation?

easy

Consider the following pairs regarding the Solar System: Pair | Description 1. Geoid | Earth-like shape 2. Orbit | Circular path of planets 3. Satellite | Celestial body moving around planets 4. Asteroids | Found between Earth and Mars How many of the above pairs are correctly matched?

medium

The term ‘Planet’ is derived from the Greek word ‘Planetai’, which translates to:

easy

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The correct option is

Earth

Explanation

Planetary nicknames are often derived from the visual appearance of the celestial body from space, which is influenced by its surface features and atmospheric composition.

Detailed Analysis:

Earth: It is designated as the "Blue Planet" because approximately 71% of its surface is covered by water. When viewed from outer space, the oceans reflect and scatter blue light, giving the planet a distinct blue appearance.
Neptune and Uranus: While these planets also appear blue or blue-green due to the presence of methane in their atmospheres (which absorbs red light), the specific epithet "Blue Planet" is standard terminology for Earth, highlighting its unique hydrosphere.
Venus: It appears bright yellowish-white due to thick clouds of sulfuric acid that reflect a significant amount of sunlight.

Key Takeaway: Earth is uniquely termed the "Blue Planet" due to the abundance of liquid water covering the majority of its surface.