OCEANOGRAPHY 90 Important MCQS Part 2 FOR NTA UGC NET
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Q.16. The maximum oceanic salinity is found in
(A) Equatorial Regions
(B) Sub-tropical Regions
(C) Sub-Polar Areas
(D) Tropical Regions
Answer: B
Explanation:
The saltiest locations in the ocean are the regions where evaporation is highest or in large bodies of water where there is no outlet into the ocean. The saltiest ocean water is in the Red Sea and in the Persian Gulf region (around 40‰) due to very high evaporation and little fresh water inflow.
Q.17. The busiest oceanic Route is
(A) Suez Canal Route
(B) Cape of Good Hope Route
(C) North Atlantic Route
(D) Panama Canal Route
Answer: C
Explanation: North Atlantic is the busiest of ocean trade routes. The Atlantic Ocean is between many trading ports from different countries and that is why it it the busiest ocean.
Q.18. The Great Barrier Reef is located
(A) Near Japan
(B) North East Coast of Australia
(C) Near Great Britain
(D) Middle Atlantic Ocean
Answer: B
Explanation:
The Great Barrier Reef is the world’s largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). The reef is located in the Coral Sea, off the coast of Queensland, Australia.
Great Barrier Reef
Q.19. The Bosphorus Strait is located between
(A) Sweden and Finland
(B) North America and South America
(C) Europe and Asia
(D) Italy and Sicily
Answer: C
Explanation:
Bosphorus Strait
Q.20. Which one of the following has the highest salinity level?
(A) Dead Sea
(B) Great Salt Lake
(C) Sambhar Lake
(D) Lake Van
Answer: D
Explanation:
Lake Assel (Djibouti) – 420 ‰
Lake Van (Turkey) – 330 ‰
Dead Sea (West Asia) – 250 ‰
Great Salt Lake (Utah, USA) – 220 ‰
Red Sea – 40 ‰
Q.21. The Turbidity Current Theory is responsible for
(A) Formation of Continental Shelf
(B) Formation of Submarine Canyons
(C) Formation of Tsunami
(D) Formation of Oceanic Trench
Answer: B
Explanation:
Q.22. The average density of sea water is
(A) 10.0278 gram/cm3
(B) 11.0278 gram/cm3
(C) 1.0378 gram/cm3
(D) 1.0278 gram/cm3
Answer: D
Explanation:
Q.23. Archipelago refers to
(A) The shallow part of the sea
(B) A group of volcanic chains
(C) A group of Islands
(D) The ring shaped coral reefs
Answer: C
Explanation:
An archipelago is a specific geological land formation that is made up of a number of islands. It is sometimes referred to as an island chain or island cluster. The various islands that are considered part of the same archipelago are located relatively close together. These formations are most commonly found in saltwater environments, like oceans and seas.
Archipelago
Q.24. The average salinity of ocean water is
(A) 32 ‰
(B) 25 ‰
(C) 30 ‰
(D) 35 ‰
Answer: D
Explanation:
Q.25. What is the most common salt in the sea water?
(A) Magnesium Chloride
(B) Sodium Chloride
(C) Magnesium Sulphate
(D) Calcium Sulphate
Answer: B
Explanation:
| Salts | Amounts (‰) |
| 1. Sodium Chloride | 27.213 |
| 2. Magnesium Chloride | 3.807 |
| 3. Magnesium Sulphate | 1.658 |
| 4. Calcium Sulphate | 1.260 |
| 5. Potasium Sulphate | 0.863 |
| 6. Calcium Carbonate | 0.123 |
| 7. Magnesium Bromide | 0.075 |
Q.26. The most important source of iodine and potash in ocean water is
(A) Green Algae
(B) Red Algae
(C) Brown Algae
(D) Blue Green Algae
Answer: C
Explanation:
Q.27. Which one of the following is the correct sequence of ocean bottom topography?
(A) Continental shelf-Abyssal Pain-Continental Rise-Continental Slope
(B) Continental Shelf-Continental Slope-Continental Rise-Abyssal Plain
(C) Continental Slope-Continental Shelf-Continental Rise-Abyssal Plain
(D) Continental Rise-Continental Slope-Continental Shelf-Abyssal Plain
Answer: B
Explanation:
Ocean Bottom Topography
Q.28. Most of the salt in the sea water is derived from
(A) Sea Floors
(B) Atmosphere
(C) Remains of Sea Life
(D) Continents
Answer: D
Explanation:
Q.29. The cold current flowing along the coast of Chile and Peru is known as
(A) EL- Nino
(B) Humboldt Current
(C) Canary Current
(D) Agulhas Current
Answer: B
Explanation:
Humboldt Current
Q.30. The average difference in the water level between high tide and low tide at a place is referred to as
(A) Tidal Bore
(B) Tidal Period
(C) Tidal Range
(D) Tidal Wave
Answer: C
Explanation:
When the highest part, or crest of the wave reaches a particular location, high tide occurs; low tide corresponds to the lowest part of the wave, or its trough. The difference in height between the high tide and the low tide is called the tidal range.