Hydrosphere - Practice Test 5

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

1. Q1.Which ocean is named after a country?

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

   Explanation: Named after India.

2. Q2.Ocean thermal energy conversion (OTEC) uses:

   • A.Temperature difference between surface and deep water✓ Correct Answer
   • B.Tides
   • C.Waves
   • D.Salt

   Explanation: To generate electricity.

3. Q3.The continuous movement of ocean water is:

   • A.Ocean Circulation✓ Correct Answer
   • B.Stagnation
   • C.Evaporation
   • D.Rain

   Explanation: Currents/Tides/Waves.

4. Q4.Which sea has the highest salinity among open oceans?

   • A.Red Sea✓ Correct Answer
   • B.Baltic Sea
   • C.North Sea
   • D.Caribbean

   Explanation: Due to high evaporation and low freshwater influx.

5. Q5.Baltic Sea has low salinity because of:

   • A.Influx of river water and low evaporation✓ Correct Answer
   • B.High evaporation
   • C.Salt mining
   • D.Volcanoes

   Explanation: Cool climate and rivers dilute it.

6. Q6.Terrigenous deposits in the ocean come from:

   • A.Land (erosion)✓ Correct Answer
   • B.Space
   • C.Volcanoes
   • D.Fish bones

   Explanation: Mud, sand, clay from land.

7. Q7.Biogenous deposits are:

   • A.Remains of marine organisms (Shells/Skeletons)✓ Correct Answer
   • B.Rocks
   • C.Sand
   • D.Meteorites

   Explanation: Oozes (Calcareous/Siliceous).

8. Q8.Polymetallic nodules (Manganese nodules) are found on:

   • A.Abyssal Plain (Deep sea floor)✓ Correct Answer
   • B.Shelf
   • C.Beach
   • D.River bed

   Explanation: Valuable resource.

9. Q9.The Antarctic Circumpolar Current is also called:

   • A.West Wind Drift✓ Correct Answer
   • B.East Wind Drift
   • C.Polar Drift
   • D.Southern Drift

   Explanation: Driven by Westerlies.

10. Q10.Which of these is a marginal sea of the Indian Ocean?

    • A.Red Sea / Persian Gulf✓ Correct Answer
    • B.Caribbean Sea
    • C.Bering Sea
    • D.North Sea

    Explanation: Connected to the Indian Ocean.

11. Q11.The coast of Norway remains ice-free in winter due to:

    • A.North Atlantic Drift (Warm)✓ Correct Answer
    • B.Canary Current
    • C.Labrador Current
    • D.Wind

    Explanation: Warm water transport.

12. Q12.The average depth of the ocean is:

    • A.3,800 meters✓ Correct Answer
    • B.100 meters
    • C.10,000 meters
    • D.500 meters

    Explanation: Approx 3.8 km.

13. Q13.Continental Shelf is important for:

    • A.Fishing and Oil/Gas✓ Correct Answer
    • B.Surfing
    • C.Diving only
    • D.Shipping lanes

    Explanation: Rich resources.

14. Q14.Seawater density depends on:

    • A.Temperature and Salinity✓ Correct Answer
    • B.Fish count
    • C.Waves
    • D.Sand

    Explanation: Cold + Salty = Denser.

15. Q15.Which ocean is shrinking?

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

    Explanation: Due to plate tectonics (subduction), Atlantic is growing.

16. Q16.The slope between the continental shelf and the abyssal plain is:

    • A.Continental Slope✓ Correct Answer
    • B.Trench
    • C.Ridge
    • D.Rise

    Explanation: Steep descent.

17. Q17.Halocline refers to a rapid change in:

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

    Explanation: Halo = Salt.

18. Q18.Pycnocline refers to a rapid change in:

    • A.Density✓ Correct Answer
    • B.Temperature
    • C.Salinity
    • D.Color

    Explanation: Pycno = Density.

19. Q19.The Humboldt Current affects the climate of:

    • A.Chile and Peru (Deserts)✓ Correct Answer
    • B.Brazil
    • C.USA
    • D.Japan

    Explanation: Creates Atacama desert conditions.

20. Q20.Sonar is used in oceanography to:

    • A.Measure depth / Map ocean floor✓ Correct Answer
    • B.Measure temperature
    • C.Catch fish
    • D.Measure salinity

    Explanation: Sound Navigation and Ranging.