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The Ocean Currents

📆 October 28, 2024

Total Questions: 21

11. Which of the following oceanic current does not flow in North Atlantic ocean? [Uttarakhand P.C.S. (Pre) 2021]

Correct Answer: (b) Benguela
Solution:The Benguela is a cold current in the South Atlantic Ocean. The Gulf stream, Norwegian and Florida are warm currents that flow in the North Atlantic Ocean.

12. The ocean current different from the remaining three is: [R.A.S./R.T.S. (Pre) 1999]

Correct Answer: (d) Peruvian
Solution:Except for Peruvian current, all the three currents mentioned above are related to the Atlantic Ocean which forms a circle. Peruvian current is related to the Southeast Pacific Ocean. Peruvian current is also known as Humboldt current. It is a cold current which flows along the west coast of the South American continent.

13. Which of the following statements is true? [ U.P.P.C.S. (Pre) 2023]

Correct Answer: (a) Ocean salinity is maximum at the Tropic of Cancer and Capricorn.
Solution:Ocean salinity is the term used to define the total content of dissolved salts in sea water. It is usually expressed as parts per thousand (‰) or ppt. Ocean salinity is maximum at the Tropic of Cancer and Tropic by Capricorn due to low rainfall and high evaporation. Hence statement (a) is correct.
The periodical rise and fall of the sea level, once or twice a day, mainly due to the attraction of the Sun and the Moon, is called a tide. Hence statement (b) is incorrect.
Benguela current is a cold current but not of the Pacific ocean. Hence statement (c) is incorrect.
When the Sun, the Moon and the Earth are in a straight line, the height of the tide will be higher. These are called spring tides and they occur twice a month, one on full moon period and another during new moon period. Hence Statement (d) is also incorrect.

14. Which of the following is cold ocean current: [ Jharkhand P.C.S. (Pre) 2003. U.P.P.C.S. (Pre) 1995]

Correct Answer: (a) Peruvian Current (Humboldt Current)
Solution:• The Humboldt Current is a cold water ocean current that travels north from Antarctica through South America's west coast, providing nutrient-rich water to the Galapagos Islands and assisting in the preservation of the islands' unique biodiversity.

• The frigid waters coming up from the depths are high in nutrients derived from dead and decaying materials on the seafloor.

• These feed phytoplankton, which is the primary producer in the environment and is critical to the food chain.

• Their richness makes the Humboldt Current one of the most productive ecosystems on the planet, supporting the world's greatest fisheries and allowing certain penguin species to thrive on the equator.

• The upper ocean's Humboldt current moves the equatorial ward, transporting new, cold Sub-Antarctic surface water northward along the fringes of the subtropical gyre.

• The primary current flow veers offshore in southern Peru, while a weaker limb continues to flow equatorward.

15. Which of the following is not matched correctly? [U.P.P.C.S. (Pre) 1998]

Correct Answer: (b) Humboldt Current - North Pacific Ocean
Solution:• The Humboldt Current is a cold water ocean current that travels north from Antarctica through South America's west coast, providing nutrient-rich water to the Galapagos Islands and assisting in the preservation of the islands' unique biodiversity.
• The frigid waters coming up from the depths are high in nutrients derived from dead and decaying materials on the seafloor.
These feed phytoplankton, which is the primary producer in the environment and is critical to the food chain.
Their richness makes the Humboldt Current one of the most productive ecosystems on the planet, supporting the world's greatest fisheries and allowing certain penguin species to thrive on the equator.
• The upper ocean's Humboldt current moves the equatorial ward, transporting new, cold Sub-Antarctic surface water northward along the fringes of the subtropical gyre.
• The primary current flow veers offshore in southern Peru, while a weaker limb continues to flow equatorward.

16. Gulf Stream is- [44th B.P.S.C. (Pre) 2000. 42nd B.P.S.C. (Pre) 1997]

Correct Answer: (b) an oceanic current
Solution:Gulf stream is a powerful warm current in the North Atlantic Ocean. It originates at the Gulf of Mexico as the Florida current which merges in Antilles current and flows through the Cape Hatteras and then flows along the east coast of United States of America. Spanish explorer Juan Ponce de Leon first discovered the Gulf Stream in 1513.

17. Which of the following pair of oceanic currents is shown in the given map: [I.A.S. (Pre) 1999]

Correct Answer: (d) Benguela and Guinea
Solution:In the above map, the current flowing from south to north is Benguela current. It is cold water current. The current flowing from north to south is Guinea Current.

18. Match List-I with List-II and select the correct answer using the code given below the Lists : [Jharkhand P.C.S. (Pre) 2013]

List-IList-II
A. Gulf Stream1. Pacific Ocean
B. West Wind Drift2. A slow eastward movement of water over the zone of westerly wind
C. Peru Current3. Indian Ocean
D. West Australian Current4. Warm current

Code:

ABCD
(a)4213
(b)1342
(c)4312
(d)1243
Correct Answer: (a)
Solution:The correctly matched of List-I and List-II is as follows :
Ocean CurrentCharacteristic/Location
Gulf StreamWarm current
West Wind DriftA slow eastward movement of water over the zone of westerly wind
Peru CurrentPacific Ocean
West Australian CurrentIndian Ocean

19. What explains the eastward flow of the equatorial counter-current? [I.A.S. (Pre) 2015]

Correct Answer: (b) Convergence of the two equatorial currents
Solution:There are two equatorial currents flowing from east to west - the north equatorial current and the south equatorial current. In between these two, there flows an equatorial counter current in the opposite direction from west to east. Piling up of water due to the convergence of two equatorial currents give rise to equatorial counter current. Therefore, it’s the earth rotation on its axis which is responsible for the eastward flow of equatorial counter current.

20. Which one of the following Oceanic currents is not associated with the Pacific Ocean? [Uttarakhand P.C.S. (Pre) 2016]

Correct Answer: (a) Canaries
Solution:There are two equatorial currents flowing from east to west - the north equatorial current and the south equatorial current. In between these two, there flows an equatorial counter current in the opposite direction from west to east. Piling up of water due to the convergence of two equatorial currents give rise to equatorial counter current. Therefore, it’s the earth rotation on its axis which is responsible for the eastward flow of equatorial counter current.
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