Ocean Currents and Tides - Practice Test 3

Attempt the quiz above first, then review every question with its correct answer and a short explanation below.

1. Q1.Isohalines connect places of equal:

   • A.Salinity✓ Correct Answer
   • B.Pressure
   • C.Rainfall
   • D.Temperature

   Explanation: Iso-Haline = Equal Salinity.

2. Q2.The Irminger Current flows near:

   • A.Iceland✓ Correct Answer
   • B.Japan
   • C.Brazil
   • D.Australia

   Explanation: It is a warm current near Iceland.

3. Q3.Which current enters the Arctic Ocean?

   • A.Norwegian Current✓ Correct Answer
   • B.Canary Current
   • C.Benguela Current
   • D.Peru Current

   Explanation: The warm Norwegian current keeps northern ports ice-free.

4. Q4.The Mozambique Current is located in:

   • A.Indian Ocean✓ Correct Answer
   • B.Pacific Ocean
   • C.Atlantic Ocean
   • D.Arctic

   Explanation: It is a warm current flowing between Madagascar and Africa.

5. Q5.The East Australian Current is:

   • A.Warm✓ Correct Answer
   • B.Cold
   • C.Neutral
   • D.Seasonal

   Explanation: It flows south along the east coast (Warm).

6. Q6.Which is the largest coral reef system?

   • A.Great Barrier Reef✓ Correct Answer
   • B.Belize Barrier Reef
   • C.Red Sea Reef
   • D.Maldives

   Explanation: Located off Australia.

7. Q7.The deepest trench, Mariana Trench, is in which ocean?

   • A.Pacific✓ Correct Answer
   • B.Atlantic
   • C.Indian
   • D.Arctic

   Explanation: West Pacific Ocean.

8. Q8.Tides help in:

   • A.Navigation and Desilting
   • B.Fishing
   • C.Electricity generation
   • D.All of the above✓ Correct Answer

   Explanation: Tides raise water levels for ships, clear silt, and run turbines.

9. Q9.Kandla and Diamond Harbour are examples of:

   • A.Tidal Ports✓ Correct Answer
   • B.River Ports
   • C.Lake Ports
   • D.Canal Ports

   Explanation: They rely on high tides for ship entry.

10. Q10.Upwelling brings:

    • A.Nutrient-rich cold water to surface✓ Correct Answer
    • B.Warm water down
    • C.Sand to surface
    • D.Oil to surface

    Explanation: Supports rich fisheries (e.g., Peru coast).

11. Q11.The Guinea Current is located in:

    • A.West Africa (Atlantic)✓ Correct Answer
    • B.East Africa
    • C.India
    • D.Australia

    Explanation: It is a warm current.

12. Q12.The Florida Current is:

    • A.Warm✓ Correct Answer
    • B.Cold
    • C.Deep
    • D.None

    Explanation: It joins the Gulf Stream (Warm).

13. Q13.Which current is responsible for the mild climate of Northwest Europe?

    • A.North Atlantic Drift✓ Correct Answer
    • B.Canary Current
    • C.Labrador Current
    • D.Benguela

    Explanation: It transports heat from the tropics.

14. Q14.The periodic rise and fall of sea level is called:

    • A.Tide✓ Correct Answer
    • B.Wave
    • C.Current
    • D.Tsunami

    Explanation: Caused by gravity.

15. Q15.Apogean Tide occurs when the Moon is:

    • A.Farthest from Earth✓ Correct Answer
    • B.Closest to Earth
    • C.At 90 degrees
    • D.New

    Explanation: Apogee = Far. Tides are lower.

16. Q16.Perigean Tide occurs when the Moon is:

    • A.Closest to Earth✓ Correct Answer
    • B.Farthest from Earth
    • C.Full
    • D.Half

    Explanation: Perigee = Near. Tides are higher.

17. Q17.The Antilles Current flows in:

    • A.Atlantic Ocean✓ Correct Answer
    • B.Pacific Ocean
    • C.Indian Ocean
    • D.Arctic

    Explanation: North of the Caribbean (Warm).

18. Q18.The Tsushima Current is a branch of:

    • A.Kuroshio✓ Correct Answer
    • B.Oyashio
    • C.California
    • D.North Equatorial

    Explanation: Warm branch entering the Sea of Japan.

19. Q19.El Nino leads to:

    • A.Weak Monsoon in India✓ Correct Answer
    • B.Strong Monsoon
    • C.Floods in Australia
    • D.Cold Peru current

    Explanation: Droughts in India/Australia, Floods in Peru.

20. Q20.La Nina leads to:

    • A.Strong Monsoon in India✓ Correct Answer
    • B.Drought in India
    • C.Floods in Peru
    • D.Warming of Pacific

    Explanation: Opposite of El Nino.