Ocean Temperature, Density, Salinity GK Questions and Answers | Oceanography MCQs

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1. The salinity of Bay of Bengal is lower than the salinity of Indian Ocean due to -
  1. Evaporation
  2. Influx of river water
  3. higher density of sea water
  4. More than one of the above

Answer: Influx of river water

2. The rate of decrease of temperature with increasing latitudes is generally
  1. 2⁰ F
  2. 1⁰ F
  3. 1.5⁰ F
  4. 0.5⁰ F

Answer: 0.5⁰ F

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3. Which among the following statements is correct about isothermal lines?
  1. They join places of equal atmospheric pressure
  2. They join places of equal salinity
  3. They join places of equal temperature
  4. They join places of equal length

Answer: They join places of equal temperature

4. The maximum and minimum annual temperature of ocean water are recorded in
  1. August and February respectively
  2. July and January respectively
  3. June and December respectively
  4. May and November respectively

Answer: August and February respectively

5. The temperature of water falls very rapidly upto the depth of ………… metres in the oceans.
  1. 400
  2. 300
  3. 200
  4. 100

Answer: 200

6. World’s most saline Ocean/Lake is
  1. Caspian Sea
  2. Great Salt Lake
  3. Dead Sea
  4. Lake Van

Answer: Lake Van

7. What is the surface zone of the ocean water called?
  1. Pelagic zone
  2. Aphotic zone
  3. Thermohaline zone
  4. Photic zone

Answer: Photic zone

8. The variation of temperatures in the northern and southern hemispheres is because, of
  1. Unequal distribution of land and water
  2. Different rate of evaporation
  3. Variation in rainfall
  4. Unequal distribution of sun rays

Answer: Unequal distribution of land and water

9. Which one of the following denotes water salinity gradient?
  1. Thermocline
  2. Halocline
  3. Pycnocline
  4. Chemocline

Answer: Halocline

10. Which of the following Sea has the highest salinity?
  1. Caspian Sea
  2. Mediterranean Sea
  3. Red Sea
  4. Dead Sea

Answer: Dead Sea

11. Which among the following statements is not correct about the Deep Zone of the ocean water?
  1. This zone lies below 1000 meters in the mid-latitudes.
  2. The temperature in this zone remains constant.
  3. It contains about 18 percent of the total volume of water in the ocean.
  4. The ocean bottom always has a temperature that is one or two degrees Celsius above the freezing point.

Answer: It contains about 18 percent of the total volume of water in the ocean.

12. Which among the following factors influence the salinity of ocean water?

1. Precipitation
2. Evaporation
3. Ocean Currents
4. Temperature

Select the correct code from the options given below:
  1. 1, 2 and 3 only
  2. 1, 2 and 4 only
  3. 1 and 2 only
  4. More than one of the above

Answer: More than one of the above

13. The major source of temperature of the ocean water is the
  1. Black body radiation
  2. Central point of the earth
  3. Volcanic eruption
  4. Sun

Answer: Sun

14. Which of the following currents raises the temperature near the eastern coasts of North America and the western coast of Europe?
  1. Brazil current
  2. Gulf stream
  3. North Atlantic current
  4. Florida current

Answer: Gulf stream

15. Which one of the following salts contributes maximum to the salinity of sea water?
  1. Calcium sulphate
  2. Magnesium chloride
  3. Magnesium sulphate
  4. Sodium chloride

Answer: Sodium chloride

16. Constantly moving system of deep-ocean circulation driven by temperature and salinity. It moves water around the globe.
  1. California Current
  2. Global Conveyor Belt
  3. Surface Currents
  4. Gulf Stream

Answer: Global Conveyor Belt

17. Which of the following waterways transport raw materials of eastern countries to western countries and transport industrial products to eastern countries?
  1. South Atlantic Oceanic Route
  2. North Atlantic Oceanic Route
  3. Routes of Mediterranean Sea
  4. Cape of Good Hope route

Answer: Routes of Mediterranean Sea

18. The decrease of temperature with increasing latitudes is more pronounced in the
  1. North Atlantic Ocean
  2. South Atlantic Ocean
  3. North Pacific Ocean.
  4. South Pacific Ocean

Answer: South Atlantic Ocean

19. The highest amount of salinity is found in
  1. Pacific Ocean
  2. Indian Ocean
  3. Mediterranean Sea
  4. Dead Sea

Answer: Dead Sea

20. Which process does NOT lead to a decrease in the salinity of water?
  1. runoff from land
  2. precipitation
  3. sea ice melting
  4. evaporation

Answer: evaporation

21. Which among the following zone contains about 80 percent of the total volume of water in the ocean?
  1. Photic zone
  2. Euphotic zone
  3. Deep zone
  4. Thermocline zone

Answer: Deep zone

22. Which among the following is not a major determinant of Ocean temperature?
  1. Latitude
  2. Revolution of the earth
  3. Density of water
  4. Ocean currents

Answer: Revolution of the earth

23. Main source of Salinity of the Sea is
  1. Rivers
  2. Land
  3. Wind
  4. Ash ejected from the Volcano

Answer: Land

24. Where would you find the lowest density seawater?
  1. surface zone
  2. deep zone
  3. Thermocline
  4. abyssal zone

Answer: surface zone

25. Which zone of ocean water does not receive adequate sunrays?
  1. Photic
  2. Euphotic
  3. Aphotic
  4. Surface

Answer: Aphotic

26. Which among the following statements is not correct about ocean temperature?
  1. The uppermost 10 percent of the oceans contain more heat than the entire atmosphere.
  2. The temperature of the oceans is always uniform.
  3. The density of ocean water is mostly a function of its temperature and salinity.
  4. The oceans of the northern hemisphere are warmer than that of the southern hemisphere.

Answer: The temperature of the oceans is always uniform.

27. The salinity of ocean waters is calculated as the amount of salt (in gm) dissolved in _____ gm of seawater.
  1. 10,000
  2. 100
  3. 1000
  4. 10

Answer: 1000

28. The daily range of temperature of surface water of the ocean is around
  1. 30⁰ C only
  2. 20⁰ C only
  3. 1⁰ C only
  4. 0 ⁰ C only

Answer: 1⁰ C only

29. Which of the following oceans record relatively higher annual range of temperature?
  1. Arctic Ocean
  2. Indian Ocean
  3. Pacific Ocean
  4. Atlantic Ocean

Answer: Atlantic Ocean

30. Where is Great Salt lake located?
  1. Iran
  2. U.S.A.
  3. India
  4. Turkey

Answer: U.S.A.

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