Ocean Currents and Tides - Practice Test 5

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

1. Q1.Great Barrier Reef is in:

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

   Explanation: Northeast coast of Australia.

2. Q2.Which current is called 'Kurishio' (Black Stream)?

   • A.Japan Current✓ Correct Answer
   • B.California Current
   • C.Peru Current
   • D.Canary Current

   Explanation: Deep blue water appears black.

3. Q3.Which current flows between Madagascar and Africa?

   • A.Mozambique Current✓ Correct Answer
   • B.Agulhas Current
   • C.Somali Current
   • D.Benguela Current

   Explanation: Flows in the Mozambique Channel.

4. Q4.Which current flows along the coast of Alaska?

   • A.Alaska Current (Warm)✓ Correct Answer
   • B.California Current
   • C.Oyashio
   • D.Kuroshio

   Explanation: Keeps ports open.

5. Q5.The Agulhas Current is formed by the union of:

   • A.Mozambique and Madagascar Currents✓ Correct Answer
   • B.Benguela and Guinea
   • C.Canary and North Atlantic
   • D.None

   Explanation: They merge south of Madagascar.

6. Q6.Which is the fastest ocean current?

   • A.Gulf Stream✓ Correct Answer
   • B.Canary
   • C.North Equatorial
   • D.Drift

   Explanation: Speeds up to 2.5 m/s.

7. Q7.The Counter-Equatorial Current flows:

   • A.West to East✓ Correct Answer
   • B.East to West
   • C.North to South
   • D.South to North

   Explanation: Opposite to the main equatorial currents.

8. Q8.Density of ocean water depends on:

   • A.Temperature and Salinity✓ Correct Answer
   • B.Wind
   • C.Tides
   • D.Waves

   Explanation: Cold and salty water is denser.

9. Q9.Thermohaline circulation refers to:

   • A.Global Ocean Conveyor Belt✓ Correct Answer
   • B.Surface currents
   • C.Tides
   • D.Wind driven currents

   Explanation: Deep ocean circulation driven by density.

10. Q10.Which current is responsible for the fog off the coast of Japan?

    • A.Meeting of Kuroshio and Oyashio✓ Correct Answer
    • B.Meeting of Gulf Stream and Labrador
    • C.Peru Current
    • D.Canary Current

    Explanation: Warm Kuroshio meets cold Oyashio.

11. Q11.Tides are highest at:

    • A.Perigee and Syzygy✓ Correct Answer
    • B.Apogee
    • C.Quadrature
    • D.Equinox

    Explanation: Closest moon + aligned sun/moon.

12. Q12.Ebb tide is good for:

    • A.Ships leaving harbour✓ Correct Answer
    • B.Ships entering
    • C.Swimming
    • D.None

    Explanation: Flow aids exit.

13. Q13.Flood tide is good for:

    • A.Ships entering harbour✓ Correct Answer
    • B.Ships leaving
    • C.Fishing
    • D.None

    Explanation: Raises water level.

14. Q14.Most currents in the Northern Indian Ocean reverse direction:

    • A.Twice a year (Monsoon)✓ Correct Answer
    • B.Never
    • C.Every day
    • D.Every month

    Explanation: Seasonal monsoon winds drive them.

15. Q15.The Somali Current is peculiar because:

    • A.It reverses direction (Cold to Warm)✓ Correct Answer
    • B.It is always cold
    • C.It is always warm
    • D.It is stationary

    Explanation: Reverses with monsoon winds.

16. Q16.Which current flows south along the east coast of Africa?

    • A.Mozambique / Agulhas✓ Correct Answer
    • B.Benguela
    • C.Canary
    • D.Somali

    Explanation: Warm currents.

17. Q17.Salinity is expressed in:

    • A.Parts per thousand (‰)✓ Correct Answer
    • B.Percent (%)
    • C.Grams
    • D.Moles

    Explanation: Standard unit.

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

    • A.North Atlantic Drift✓ Correct Answer
    • B.Gulf Stream
    • C.Labrador
    • D.Canary

    Explanation: Extension near Iceland.

19. Q19.Which ocean has the simplest current circulation?

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

    Explanation: Due to well-defined shape.

20. Q20.Tidal bore occurs in which river in India?

    • A.Hooghly (Kolkata)✓ Correct Answer
    • B.Ganga
    • C.Yamuna
    • D.Godavari

    Explanation: Tides rush up the river mouth.