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Q50 (CAPF/2016) Geography › World Physical Geography › Ocean water properties Answer Verified

If a place is affected by Tide at 6.00 AM Monday , normally at what time the same place will be affected by Ebb?

Result
Your answer: —  Â·  Correct: C
Explanation

Tides are primarily governed by the lunar day, which lasts 24 hours and 50 minutes [4]. In a standard semi-diurnal tidal pattern, there are two high tides and two low tides within this period [3]. Consequently, high tides occur approximately every 12 hours and 25 minutes [2]. The 'ebb' refers to the period when the water level is falling from high tide to low tide [3]. The time interval between a high tide and the subsequent low tide (ebb) is exactly half of the semi-diurnal interval, which is 6 hours and 12.5 minutes [4]. If a high tide occurs at 6:00 AM on Monday, the following low tide (ebb) will occur 6 hours and 12.5 minutes later. Adding this duration to 6:00 AM results in 12:12:30 PM, which is approximately 12:13 PM on Monday [4].

Sources

  1. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 32: Ocean Movements Ocean Currents And Tides > Ebb And Flood > p. 503
  2. [4] https://oceanservice.noaa.gov/education/tutorial_tides/tides05_lunarday.html
  3. [1] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 13: Movements of Ocean Water > Tides based on Frequency > p. 110
  4. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 32: Ocean Movements Ocean Currents And Tides > Ebb And Flood > p. 502
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