With reference to the forces generating tides, consider the following statements: 1. The moon’s gravitational pull is the primary cause for the occurrence of tides. 2. Centrifugal force acts in the same direction as gravity. 3. On the side of the earth facing the moon, the gravitational attraction of the moon is greater than the centrifugal force. Which of the statements given above is/are correct?

The correct option is 1 and 3 only. Explanation Tides are the rhythmical rise and fall of ocean water caused by the combined effects of the gravitational attraction of the Moon and the Sun, along with the centrifugal force generated by the Earth's rotation. Statement-wise Analysis - Statement 1 is Correct: The Moon’s gravitational pull is the primary cause of tides. Although the Sun is far more massive, the Moon exerts a greater tide-generating force (approximately double that of the Sun) because it is much closer to the Earth. - Statement 2 is Incorrect: Centrifugal force acts in the direction opposite to the gravitational attraction of the Moon. While gravity pulls water towards the Moon, centrifugal force acts outwards, away from the center of rotation, to counterbalance gravity. - Statement 3 is Correct: On the side of the Earth facing the Moon, the gravitational attraction is at its maximum and exceeds the centrifugal force. This net force pulls the water towards the Moon, creating a tidal bulge. On the opposite side of the Earth, the centrifugal force is greater than the Moon's gravitational pull, causing a second bulge away from the Moon. Key Takeaway: The horizontal tide-generating force is the resultant of the difference between the gravitational pull of the Moon and the centrifugal force. These forces act in opposite directions to create two simultaneous tidal bulges on opposite sides of the Earth.

With reference to the forces generating… - NCERT Class 11 Geography MCQ

NCERT Class 11 Geography — Chapter 2: Movements of Ocean Water

mcqmedium

With reference to the forces generating tides, consider the following statements:

The moon’s gravitational pull is the primary cause for the occurrence of tides.
Centrifugal force acts in the same direction as gravity.
On the side of the earth facing the moon, the gravitational attraction of the moon is greater than the centrifugal force.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Fundamentals of Physical Geography · Page 2

Options

A1, 2 and 3
B1 and 3 only
C1 and 2 only
D2 only

Did you get this right?

Solution

The correct option is 1 and 3 only.

Explanation

Tides are the rhythmical rise and fall of ocean water caused by the combined effects of the gravitational attraction of the Moon and the Sun, along with the centrifugal force generated by the Earth's rotation.

Statement-wise Analysis

Statement 1 is Correct: The Moon’s gravitational pull is the primary cause of tides. Although the Sun is far more massive, the Moon exerts a greater tide-generating force (approximately double that of the Sun) because it is much closer to the Earth.
Statement 2 is Incorrect: Centrifugal force acts in the direction opposite to the gravitational attraction of the Moon. While gravity pulls water towards the Moon, centrifugal force acts outwards, away from the center of rotation, to counterbalance gravity.
Statement 3 is Correct: On the side of the Earth facing the Moon, the gravitational attraction is at its maximum and exceeds the centrifugal force. This net force pulls the water towards the Moon, creating a tidal bulge. On the opposite side of the Earth, the centrifugal force is greater than the Moon's gravitational pull, causing a second bulge away from the Moon.

Key Takeaway: The horizontal tide-generating force is the resultant of the difference between the gravitational pull of the Moon and the centrifugal force. These forces act in opposite directions to create two simultaneous tidal bulges on opposite sides of the Earth.

Your note

More from Chapter 2: Movements of Ocean Water

The interval between Spring tides and Neap tides is normally:

easy

Deep water currents make up what percentage of the ocean water?

easy

In oceanography, the size and shape of a wave are primarily indicative of its:

easy

Which force is responsible for creating the second tidal bulge away from the moon?

easy

How do differences in water density affect the vertical mobility of ocean currents? 1. Water with high salinity is less dense than water with low salinity. 2. Cold water is denser than warm water. 3. Denser water tends to rise while lighter water tends to sink. Which of the statements given above is/are correct?

easy

Keep practising Chapter 2: Movements of Ocean Water

Work through every question from this NCERT chapter.

Browse all NCERT Class 11 Geography chapters