1 $Which of the following is the deepest trench in the world?$

A.

Puerto Rico Trench

B.

Mariana Trench

C.

Sunda Trench

D.

Tonga Trench

2 $The 'S-shaped' ridge is a characteristic feature of which ocean's bottom topography?$

A.

Pacific Ocean

B.

Indian Ocean

C.

Atlantic Ocean

D.

Arctic Ocean

3 $Which submarine ridge divides the Indian Ocean into eastern and western basins?$

A.

Mid-Atlantic Ridge

B.

Carlsberg Ridge

C.

East Pacific Rise

D.

Walvis Ridge

4 $What is the average salinity of the world's oceans?$

A.

25 parts per thousand

B.

30 parts per thousand

C.

35 parts per thousand

D.

45 parts per thousand

5 $Which layer of the ocean is characterized by a rapid decrease in temperature with increasing depth?$

A.

Epilimnion

B.

Thermocline

C.

Halocline

D.

Pycnocline

6 $The 'Telegrpah Plateau' is located in which ocean?$

A.

North Atlantic Ocean

B.

South Pacific Ocean

C.

Indian Ocean

D.

Arctic Ocean

7 $Which of the following currents is a warm ocean current?$

A.

Canary Current

B.

Benguela Current

C.

Gulf Stream

D.

California Current

8 $The presence of the 'Ring of Fire' is associated with the bottom topography of which ocean?$

A.

Atlantic Ocean

B.

Indian Ocean

C.

Pacific Ocean

D.

Southern Ocean

9 $What term is used to describe the zone of rapid salinity change with depth?$

A.

Thermocline

B.

Halocline

C.

Isohaline

D.

Pycnocline

10 $Which of the following is an example of pelagic deposits?$

A.

Gravel

B.

Sand

C.

Red Clay

D.

Mud

11 $The Labrador Current is a cold current located in which ocean?$

A.

Pacific Ocean

B.

Atlantic Ocean

C.

Indian Ocean

D.

Southern Ocean

12 $Tides that occur when the Sun, Earth, and Moon are aligned in a straight line are called:$

A.

Neap Tides

B.

Spring Tides

C.

Diurnal Tides

D.

Mixed Tides

13 $Which ocean has the widest Continental Shelf?$

A.

Indian Ocean

B.

Pacific Ocean

C.

Atlantic Ocean

D.

Arctic Ocean

14 $What are 'Guyots'?$

A.

Deep sea trenches

B.

Flat-topped seamounts

C.

Coral atolls

D.

Submarine canyons

15 $Polymetallic nodules, a significant marine mineral resource, are primarily rich in:$

A.

Gold

B.

Manganese

C.

Uranium

D.

Coal

16 $The Agulhas Current flows along the coast of which ocean?$

A.

Pacific Ocean

B.

Atlantic Ocean

C.

Indian Ocean

D.

Arctic Ocean

17 $Which of the following factors increases the salinity of ocean water?$

A.

Precipitation

B.

River water influx

C.

Evaporation

D.

Melting of ice

18 $The symbiotic algae living within coral polyps are known as:$

A.

Phytoplankton

B.

Zooxanthellae

C.

Diatoms

D.

Kelp

19 $The Sargasso Sea is a distinct region in which ocean?$

A.

North Pacific

B.

South Pacific

C.

North Atlantic

D.

South Atlantic

20 $Which pollution phenomenon is caused by excessive nutrient runoff leading to oxygen depletion?$

A.

Bioaccumulation

B.

Eutrophication

C.

Salinization

D.

Acidification

21 $The Puerto Rico Trench is the deepest point in which ocean?$

A.

Pacific Ocean

B.

Atlantic Ocean

C.

Indian Ocean

D.

Southern Ocean

22 $Ooze deposits composed primarily of calcium carbonate shells are called:$

A.

Siliceous Ooze

B.

Calcareous Ooze

C.

Red Clay

D.

Terrigenous mud

23 $The periodic rise and fall of sea level is primarily caused by:$

A.

Ocean currents

B.

Wind speed

C.

Gravitational pull of the Moon and Sun

D.

Difference in salinity

24 $Which ocean current is associated with the 'El Nino' phenomenon?$

A.

Peru Current

B.

Brazil Current

C.

Kuroshio Current

D.

Benguela Current

25 $Exclusive Economic Zones (EEZ) generally extend how far from a country's coastline?$

A.

12 nautical miles

B.

24 nautical miles

C.

100 nautical miles

D.

200 nautical miles

26 $The Sunda Trench is a significant topographical feature of the:$

A.

Atlantic Ocean

B.

Pacific Ocean

C.

Indian Ocean

D.

Arctic Ocean

27 $Ocean Thermal Energy Conversion (OTEC) utilizes what property to generate energy?$

A.

Wave height

B.

Tidal range

C.

Temperature difference between surface and deep water

D.

Salinity gradients

28 $The Great Barrier Reef is located off the coast of:$

A.

Brazil

B.

Indonesia

C.

Australia

D.

South Africa

29 $Which of the following is a cold current in the Pacific Ocean?$

A.

Kuroshio Current

B.

East Australian Current

C.

California Current

D.

North Equatorial Current

30 $Diatom ooze is a type of:$

A.

Calcareous Ooze

B.

Siliceous Ooze

C.

Terrigenous Deposit

D.

Cosmic Dust

31 $The gentle slope linking the continental shelf and the deep sea floor is called the:$

A.

Continental Rise

B.

Continental Slope

C.

Abyssal Plain

D.

Mid-ocean Ridge

32 $Minamata disease was caused by which type of marine pollution?$

A.

Oil Spill

B.

Mercury poisoning

C.

Plastic waste

D.

Thermal pollution

33 $Which sea has the highest salinity due to high evaporation and lack of river inflow?$

A.

Baltic Sea

B.

Red Sea

C.

Black Sea

D.

Caspian Sea

34 $The 'Great Pacific Garbage Patch' is primarily composed of:$

A.

Oil sludge

B.

Microplastics and floating debris

C.

Chemical waste

D.

Organic sewage

35 $The deflection of ocean currents to the right in the Northern Hemisphere is due to:$

A.

Gravitational force

B.

Centrifugal force

C.

Coriolis force

D.

Frictional force

36 $Which of the following represents a biotic marine resource?$

A.

Salt

B.

Petroleum

C.

Fish

D.

Sand

37 $Neap tides occur during which lunar phase?$

A.

Full Moon only

B.

New Moon only

C.

First and Third Quarter Moon

D.

Perigee

38 $Coral bleaching is primarily a response to:$

A.

Decreased salinity

B.

Increased water temperature

C.

Increased nutrient load

D.

Stronger currents

39 $Which current meets the Labrador Current to produce heavy fog near Newfoundland?$

A.

Canary Current

B.

North Atlantic Drift

C.

Gulf Stream

D.

Brazil Current

40 $Terrigenous deposits in the ocean are derived from:$

A.

Marine plants

B.

Marine animals

C.

Land erosion

D.

Volcanic eruptions underwater

41 $The deepest part of the ocean floor, which is relatively flat, is known as the:$

A.

Continental Shelf

B.

Abyssal Plain

C.

Continental Slope

D.

Trench

42 $Which ocean is known for the 'Ninety East Ridge'?$

A.

Atlantic Ocean

B.

Pacific Ocean

C.

Indian Ocean

D.

Arctic Ocean

43 $Placer deposits in coastal sands are often a source of:$

A.

Petroleum

B.

Heavy minerals like Monazite and Zircon

C.

Natural Gas

D.

Polymetallic nodules

44 $Lines on a map connecting points of equal salinity are called:$

A.

Isotherms

B.

Isobars

C.

Isohalines

D.

Isobaths

45 $What is the primary condition required for the formation of coral reefs?$

A.

Cold, deep water

B.

Muddy, fresh water

C.

Warm, clear, shallow water

D.

High nutrient, dark water

46 $The Benguela Current is a cold current located off the coast of:$

A.

Western Australia

B.

Eastern South America

C.

Southwestern Africa

D.

California

47 $A circular coral reef that encloses a lagoon but has no central island is called an:$

A.

Fringing Reef

B.

Barrier Reef

C.

Atoll

D.

Patch Reef

48 $Offshore drilling on the continental shelf is a major method for extracting:$

A.

Coal

B.

Oil and Natural Gas

C.

Iron Ore

D.

Limestone

49 $The Challenger Rise is a submarine feature of which ocean?$

A.

Atlantic Ocean

B.

Pacific Ocean

C.

Indian Ocean

D.

Arctic Ocean

50 $Which of the following is NOT a major source of marine pollution?$

A.

Agricultural runoff

B.

Sewage discharge

C.

Hydrothermal vents

D.

Oil spills

Unit 4 - Practice Quiz