Hydrosphere - Practice Test 2

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

1. Q1.Neap Tides occur when the Sun and Moon are:

   • A.In a straight line
   • B.At right angles to each other✓ Correct Answer
   • C.Close together
   • D.Far apart

   Explanation: During quarter moons, gravitational forces counteract each other.

2. Q2.The time interval between two high tides is approx:

   • A.12 hours
   • B.12 hours 26 minutes✓ Correct Answer
   • C.24 hours
   • D.6 hours

   Explanation: Due to the Moon's revolution, tides are delayed by ~26 mins each cycle.

3. Q3.El Nino is a warm ocean current that appears along the coast of:

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

   Explanation: It replaces the cold Peru (Humboldt) current.

4. Q4.Coral Reefs are mainly found in:

   • A.Tropical Oceans✓ Correct Answer
   • B.Polar Oceans
   • C.Deep Trenches
   • D.Cold currents

   Explanation: Corals need warm water (20-21°C) to survive.

5. Q5.The Great Barrier Reef is located in:

   • A.Australia✓ Correct Answer
   • B.India
   • C.Maldives
   • D.USA

   Explanation: It is the world's largest coral reef system, off Queensland.

6. Q6.Which current flows in the Indian Ocean?

   • A.Agulhas Current✓ Correct Answer
   • B.Gulf Stream
   • C.Canary Current
   • D.Humboldt Current

   Explanation: Agulhas is a warm current in the SW Indian Ocean.

7. Q7.The Benguela Current is a cold current flowing along:

   • A.West coast of South Africa✓ Correct Answer
   • B.East coast of Africa
   • C.West coast of South America
   • D.East coast of USA

   Explanation: It flows northwards along the west coast of Southern Africa.

8. Q8.Kuroshio Current is in which ocean?

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

   Explanation: It is a warm current in the North Pacific (similar to Gulf Stream).

9. Q9.The deepest trench in the Indian Ocean is:

   • A.Sunda (Java) Trench✓ Correct Answer
   • B.Mariana Trench
   • C.Puerto Rico Trench
   • D.Tonga Trench

   Explanation: The Sunda Trench is the deepest point in the Indian Ocean.

10. Q10.Thermocline refers to:

    • A.Zone of rapid temperature drop with depth✓ Correct Answer
    • B.Zone of constant temperature
    • C.Surface water
    • D.Deepest water

    Explanation: It is the layer where temperature decreases rapidly compared to layers above and below.

11. Q11.Which strait connects the Atlantic Ocean to the Mediterranean Sea?

    • A.Strait of Gibraltar✓ Correct Answer
    • B.Strait of Dover
    • C.Bering Strait
    • D.Strait of Malacca

    Explanation: Gibraltar is the entry point to the Mediterranean.

12. Q12.The Bering Strait separates:

    • A.Asia and North America✓ Correct Answer
    • B.Europe and Africa
    • C.Australia and New Zealand
    • D.India and Sri Lanka

    Explanation: It separates Russia (Asia) from Alaska (USA).

13. Q13.The Suez Canal connects:

    • A.Red Sea and Mediterranean Sea✓ Correct Answer
    • B.Atlantic and Pacific
    • C.Black Sea and Marmara
    • D.North Sea and Baltic

    Explanation: It provides a direct route between Europe and Asia.

14. Q14.The Panama Canal connects:

    • A.Atlantic and Pacific Oceans✓ Correct Answer
    • B.Indian and Pacific
    • C.Mediterranean and Red
    • D.Arctic and Atlantic

    Explanation: It cuts through the Isthmus of Panama.

15. Q15.Fathometer is used to measure:

    • A.Ocean Depth✓ Correct Answer
    • B.Earthquakes
    • C.Rainfall
    • D.Wind Speed

    Explanation: 1 Fathom = 6 feet.

16. Q16.Which ocean is called the 'Herring Pond'?

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

    Explanation: Due to extensive Herring fishing and trade between Europe/USA.

17. Q17.Which current is also known as the 'Europe's Blanket'?

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

    Explanation: It keeps Western European ports warm in winter.

18. Q18.The Peru Current is also known as:

    • A.Humboldt Current✓ Correct Answer
    • B.Benguela Current
    • C.Falkland Current
    • D.Brazil Current

    Explanation: It is a cold current along the west coast of South America.

19. Q19.Salinity decreases near the equator due to:

    • A.Heavy rainfall✓ Correct Answer
    • B.High evaporation
    • C.Ice melting
    • D.High winds

    Explanation: Heavy daily rain dilutes the seawater.

20. Q20.Which sea has no coastline?

    • A.Sargasso Sea✓ Correct Answer
    • B.Red Sea
    • C.Black Sea
    • D.White Sea

    Explanation: It is defined by ocean currents, not land boundaries.