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

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In the context of oceanography, how does the Coriolis force influence the direction of moving ocean water?

Official previous-year question

Verified 1 Aug 2026.

Options

ATowards the equator in both hemispheres.
BTo the left in the northern hemisphere and to the right in the southern hemisphere.
CTo the right in the northern hemisphere and to the left in the southern hemisphere.
DTowards the poles in both hemispheres.

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Solution

The correct option is To the right in the northern hemisphere and to the left in the southern hemisphere..

Explanation

The Coriolis force is an apparent force caused by the rotation of the Earth on its axis. It plays a critical role in determining the direction of moving fluids, such as ocean currents and winds, on the planetary surface.

Analysis of Deflection:

Earth's Rotation: The Earth rotates from west to east. This rotation creates a deflective force known as the Coriolis force.
Directional Rule (Ferrel’s Law): The Coriolis force deflects moving objects (including water masses) to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
Impact on Ocean Currents: As ocean water moves under the influence of wind or density differences, the Coriolis force modifies its path. Instead of flowing in a straight line, currents curve according to the hemisphere they are in.
Magnitude: The effect of the Coriolis force is zero at the equator and increases towards the poles.

Key Takeaway:

Due to Earth's rotation, the Coriolis force causes moving ocean water to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

Your note

More from Chapter 2: Movements of Ocean Water

Consider the following factors: 1. The shape of bays and estuaries has no influence on the magnitude of tides. 2. Presence of wide continental shelves. 3. Presence of mid-oceanic islands. Which of the above factors can influence the height or magnitude of tidal bulges?

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Which of the following best describes the general movement of warm ocean currents?

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With reference to the movements of ocean water, consider the following statements: 1. Ocean currents represent the horizontal motion of water while tides represent the vertical motion. 2. In waves, the water moves ahead from one place to another along with the wave train. 3. The upwelling of cold water from the subsurface is a form of horizontal motion. Which of the statements given above is/are correct?

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Consider the following statements regarding the characteristics of ocean waves: 1. The largest waves are typically found in open oceans rather than enclosed seas. 2. Steep waves are generally old and originate from far away places. 3. Slow and steady waves usually originate from far away places. Which of the statements given above is/are correct?

medium

The maximum height of a wave is determined by which of the following factors? 1. The strength of the wind has no role in determining wave height. 2. The duration for which the wind blows. 3. The area over which the wind blows in a single direction. Select the correct answer using the code given below:

easy

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The correct option is To the right in the northern hemisphere and to the left in the southern hemisphere..

Explanation

Analysis of Deflection:

Earth's Rotation: The Earth rotates from west to east. This rotation creates a deflective force known as the Coriolis force.
Directional Rule (Ferrel’s Law): The Coriolis force deflects moving objects (including water masses) to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
Impact on Ocean Currents: As ocean water moves under the influence of wind or density differences, the Coriolis force modifies its path. Instead of flowing in a straight line, currents curve according to the hemisphere they are in.
Magnitude: The effect of the Coriolis force is zero at the equator and increases towards the poles.

Key Takeaway:

Due to Earth's rotation, the Coriolis force causes moving ocean water to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.