Consider the following statements regarding the visibility of the Moon: 1. The Full Moon is visible only once in about a month. 2. A fortnight after the Full Moon, the Moon appears as a Full Moon again. 3. The New Moon night is the best time to observe the night sky if it is clear. Which of the statements given above is/are correct?

The correct option is (c). Explanation The changing visibility of the Moon is determined by its position relative to the Earth and the Sun. This cycle of phases, known as the lunar month or synodic month, lasts approximately 29.5 days. Statement-wise Analysis: - Statement 1 is Correct: The Full Moon (Purnima) occurs when the Earth is positioned between the Sun and the Moon, allowing the entire illuminated side of the Moon to be visible from Earth. This phenomenon occurs once in a lunar cycle, which is roughly one month. - Statement 2 is Incorrect: A fortnight represents a period of approximately 14 to 15 days. A fortnight after the Full Moon, the Moon completes half of its cycle and reaches the New Moon phase (Amavasya), where it is not visible from Earth. It does not appear as a Full Moon again until the cycle completes (approx. 29.5 days). - Statement 3 is Correct: On a New Moon night, the Moon is not visible in the sky, resulting in the absence of moonlight. This lack of natural light pollution makes it the optimal time to observe stars and other celestial objects, provided the sky is clear. Key Takeaway: The lunar cycle transitions from Full Moon to New Moon over a fortnight; the absence of moonlight during the New Moon provides the darkest background for astronomical observations.

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

mcqmedium

Consider the following statements regarding the visibility of the Moon:

The Full Moon is visible only once in about a month.
A fortnight after the Full Moon, the Moon appears as a Full Moon again.
The New Moon night is the best time to observe the night sky if it is clear.

Which of the statements given above is/are correct?

Official previous-year question

Verified 1 Aug 2026.

Options

A1 and 2 only
B2 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

The correct option is (c).

Explanation

The changing visibility of the Moon is determined by its position relative to the Earth and the Sun. This cycle of phases, known as the lunar month or synodic month, lasts approximately 29.5 days.

Statement-wise Analysis:

Statement 1 is Correct: The Full Moon (Purnima) occurs when the Earth is positioned between the Sun and the Moon, allowing the entire illuminated side of the Moon to be visible from Earth. This phenomenon occurs once in a lunar cycle, which is roughly one month.
Statement 2 is Incorrect: A fortnight represents a period of approximately 14 to 15 days. A fortnight after the Full Moon, the Moon completes half of its cycle and reaches the New Moon phase (Amavasya), where it is not visible from Earth. It does not appear as a Full Moon again until the cycle completes (approx. 29.5 days).
Statement 3 is Correct: On a New Moon night, the Moon is not visible in the sky, resulting in the absence of moonlight. This lack of natural light pollution makes it the optimal time to observe stars and other celestial objects, provided the sky is clear.

Key Takeaway: The lunar cycle transitions from Full Moon to New Moon over a fortnight; the absence of moonlight during the New Moon provides the darkest background for astronomical observations.

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?

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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 (c).

Explanation

The changing visibility of the Moon is determined by its position relative to the Earth and the Sun. This cycle of phases, known as the lunar month or synodic month, lasts approximately 29.5 days.

Statement-wise Analysis:

Statement 1 is Correct: The Full Moon (Purnima) occurs when the Earth is positioned between the Sun and the Moon, allowing the entire illuminated side of the Moon to be visible from Earth. This phenomenon occurs once in a lunar cycle, which is roughly one month.
Statement 2 is Incorrect: A fortnight represents a period of approximately 14 to 15 days. A fortnight after the Full Moon, the Moon completes half of its cycle and reaches the New Moon phase (Amavasya), where it is not visible from Earth. It does not appear as a Full Moon again until the cycle completes (approx. 29.5 days).
Statement 3 is Correct: On a New Moon night, the Moon is not visible in the sky, resulting in the absence of moonlight. This lack of natural light pollution makes it the optimal time to observe stars and other celestial objects, provided the sky is clear.

Key Takeaway: The lunar cycle transitions from Full Moon to New Moon over a fortnight; the absence of moonlight during the New Moon provides the darkest background for astronomical observations.