Consider the following calculation regarding Earth's rotation: 1. The Earth rotates 360° in about 24 hours. 2. The Earth rotates 25° in one hour. 3. The Earth rotates 1° in four minutes. Which of the statements given above is/are correct?

The correct option is (c). Explanation The Earth rotates on its axis from west to east. This rotation is the basis for the measurement of time and the determination of longitudes. A complete rotation constitutes a solar day. - Statement 1 is Correct: The Earth completes one full rotation on its axis, covering 360°, in approximately 24 hours. - Statement 2 is Incorrect: The rate of rotation per hour is calculated by dividing the total degrees by the total time: 360° ÷ 24 hours = 15° per hour. Therefore, the Earth rotates 15° in one hour, not 25°. - Statement 3 is Correct: Since the Earth rotates 15° in 60 minutes (1 hour), the time taken to cover 1° is calculated as: 60 minutes ÷ 15 = 4 minutes. Thus, the Earth rotates 1° every 4 minutes. Key Takeaway: The Earth rotates at a speed of 15° per hour, which equates to 1° every 4 minutes. This relationship is essential for calculating local time differences between longitudes.

Consider the following calculation… - NCERT Class 6 Geography MCQ

NCERT Class 6 Geography — Chapter 1: Globe: Latitudes and Longitudes

mcqeasy

Consider the following calculation regarding Earth's rotation:

The Earth rotates 360° in about 24 hours.
The Earth rotates 25° in one hour.
The Earth rotates 1° in four minutes.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT The Earth Our Habitat · Page 15

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 Earth rotates on its axis from west to east. This rotation is the basis for the measurement of time and the determination of longitudes. A complete rotation constitutes a solar day.

Statement 1 is Correct: The Earth completes one full rotation on its axis, covering 360°, in approximately 24 hours.
Statement 2 is Incorrect: The rate of rotation per hour is calculated by dividing the total degrees by the total time:
360° ÷ 24 hours = 15° per hour.
Therefore, the Earth rotates 15° in one hour, not 25°.
Statement 3 is Correct: Since the Earth rotates 15° in 60 minutes (1 hour), the time taken to cover 1° is calculated as:
60 minutes ÷ 15 = 4 minutes.
Thus, the Earth rotates 1° every 4 minutes.

Key Takeaway: The Earth rotates at a speed of 15° per hour, which equates to 1° every 4 minutes. This relationship is essential for calculating local time differences between longitudes.

Your note

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