Oceans & Currents — Set 1
Geography · महासागर और धाराएं · Questions 1–10 of 50
Which of the following seas is unique because it has no land boundaries?
Correct Answer: C. Sargasso Sea
The Sargasso Sea is the only sea located entirely within the Atlantic Ocean with no land boundaries. It is defined by ocean currents like the Gulf Stream and North Atlantic Drift. It is known for its distinctive brown sargassum seaweed.
Lines on a map connecting points of equal salinity in the ocean are known as?
Correct Answer: B. Isohalines
Isohalines are lines connecting points of equal salinity in the oceans. Salinity refers to the amount of dissolved salts in water. These lines help in understanding the distribution of salt content across different marine regions.
Which of the following is a warm ocean current found in the Indian Ocean?
Correct Answer: D. Agulhas Current
The Agulhas Current is a warm current that flows down the east coast of Africa in the Indian Ocean. The other options are cold currents located in the Atlantic Ocean. It plays a significant role in the climate of Southern Africa.
Which part of the ocean floor is the shallowest and closest to the continent?
Correct Answer: C. Continental Shelf
The Continental Shelf is the shallowest part of the ocean floor extending from the coast. It gently slopes towards the ocean basin and is rich in resources like oil and fish. Its average depth is about 200 meters.
The Mid-Atlantic Ridge roughly follows the shape of which English letter?
Correct Answer: D. S
The Mid-Atlantic Ridge roughly follows the 'S' shape of the Atlantic Ocean. It is a divergent tectonic plate boundary located along the floor of the Atlantic Ocean. New ocean floor is formed here due to volcanic activity.
The Humboldt Current flows along the coast of which country?
Correct Answer: D. Peru
The Humboldt Current, also known as the Peru Current, flows north along the west coast of South America (Peru and Chile). It is a cold, low-salinity ocean current. It brings nutrient-rich water to the surface, supporting rich fisheries.
The famous fishing grounds of the Grand Banks are formed by the meeting of which two currents?
Correct Answer: C. Gulf Stream and Labrador
The Grand Banks fishing grounds are formed by the meeting of the warm Gulf Stream and the cold Labrador Current. This convergence creates ideal conditions for the growth of plankton, attracting fish. It also causes frequent heavy fog in the region.
Which ocean is the deepest on average?
Correct Answer: A. Pacific Ocean
The Pacific Ocean is the deepest ocean on Earth. It contains the deepest known point, the Mariana Trench. Its large area and numerous trenches contribute to its high average depth.
The zone in the ocean where temperature decreases rapidly with depth is called?
Correct Answer: C. Thermocline
The Thermocline is the layer where water temperature drops rapidly with increasing depth. It separates the warm upper layer from the cold deeper water. This transition zone typically occurs between 200 meters and 1000 meters deep.
The Canary Current is a cold current located in which ocean?
Correct Answer: C. Atlantic Ocean
The Canary Current is a cold current located in the North Atlantic Ocean. It flows south along the west coast of North Africa towards the equator. It is part of the North Atlantic Gyre.