NG Ocean General Questions 7P

Navigation General General Ocean Questions

1 855 Ref: Ocean, Breakers, Flat Slope B The chart of a beach area shows a very flat slope to the underwater beach bottom. What type of breakers can be expected when trying to land a boat on this beach? A. Surging C. Plunging B. Spilling D. Converging

2 856 Ref: Ocean, Breakers, Steep Slope A The chart of a beach area shows a very steep slope to the underwater beach bottom. Which type of breakers can be expected when trying to land a boat on this beach? A. Surging C. Spilling B. Converging D. Plunging

3 688 Ref: Ocean, Current, Cause C Ocean currents are well defined and ______. A. create large waves in the direction of the current B. change direction 360° during a 24 hour period C. remain fairly constant in direction and velocity throughout the year D. are characterized by a light green color

4 1243 Ref: Ocean, Current, Cause B The two most effective generating forces of surface ocean currents are ______. A. temperature and salinity differences in the water B. wind and density differences in the water C. water depth and underwater topography D. rotation of the Earth and continental interference

5 589 Ref: Ocean, Current, Circulation A In the Northern Hemisphere the major ocean currents tend to flow ______. A. clockwise around the North Atlantic and North Pacific Oceans B. clockwise or counterclockwise depending on whether it is warm or cold current C. counterclockwise except in the Gulf Stream D. counterclockwise around the North Atlantic and North Pacific Oceans

6 305 Ref: Ocean, Current, Agulhas A As the South Equatorial Current approaches the east coast of Africa, it divides with the main part flowing south to form the warm ______. A. Agulhas Current C. Benguela Current B. Canary Current D. Madagascar Current

7 721 Ref: Ocean, Current, Agulhas C On an Atlantic Ocean voyage from New York to Durban, South Africa, you should expect the Agulhas Current to present a strong ______. A. offshore set B. onshore set C. head current D. fair or following current

8 714 Ref: Ocean, Current, Benguela B On a voyage from Cape Town to London, the favorable ocean current off the coast of Africa is the ______. A. Canary Current B. Benguela Current C. Agulhas Current D. South Atlantic Current

9 838 Ref: Ocean, Current, Benguela C The Benguela Current flows in a ______. A. SW'ly direction along the NW coast of Africa B. S'ly direction off the East Coast of Australia C. NW'ly direction along the SW coast of Africa D. SW'ly direction along the SE coast of Greenland

10 1680 Ref: Ocean, Current, Benguela D Which current would you encounter on a direct passage from London, England, to Cape Town, South Africa? A. Falkland Current C. Norway Current B. Brazil Current D. Benguela Current

11 840 Ref: Ocean, Current, Brazil B The Brazil Current flows in which general direction? A. Northwesterly C. Southeasterly B. Southwesterly D. Northerly

12 1372 Ref: Ocean, Current, California D What current flows southward along the west coast of the United States and causes extensive fog in that area? A. Davidson Current C. Alaska Current B. North Pacific Current D. California Current

13 715 Ref: Ocean, Current, Canary B On a voyage from Halifax, N.S., to Dakar, West Africa, the Canary Current will ______. A. set the vessel to the left B. set the vessel to the right C. offer resistance in the form of a head current D. furnish additional thrust in the form of a fair or following current

14 618 Ref: Ocean, Current, Equatorial Counter C In which month will the equatorial counter current be strongest? A. January C. August B. April D. October

15 1192 Ref: Ocean, Current, Equatorial Counter B The set of the equatorial countercurrent is generally to the ______. A. north C. southwest B. east D. northwest

16 1494 Ref: Ocean, Current, Gulf Stream B What natural feature is responsible for the rather even climate found on the Florida peninsula throughout the year? A. Strong masses of continental air B. The Gulf Stream C. The Bermuda high D. The cool waters of the Sargasso sea

17 989 Ref: Ocean, Current, Humboldt A The Humboldt Current flows in which direction? A. North B. South C. East D. West

18 456 Ref: Ocean, Current, Kuroshio B Generally speaking, a ship steaming across the North Pacific from Japan to Seattle is likely to experience ______. A. adverse currents for practically the entire crossing B. favorable currents for practically the entire crossing C. favorable currents in the summer months and adverse currents in the winter months D. variable currents having no significant effect on the total steaming time

19 874 Ref: Ocean, Current, Kuroshio A The current that, in many respects, is similar to the Gulf Stream is the ______. A. Kuroshio C. Oyashio B. California Current D. Benguela Current

20 1717 Ref: Ocean, Current, Kuroshio A Which ocean current is "warm" based on the latitude in which it originates and on the effect it has on climate? A. Kuroshio Current C. Peru Current B. Benguela Current D. California Current

21 863 Ref: Ocean, Current, Labrador B The cold ocean current which meets the warm Gulf Stream between latitudes 40° and 43°N to form the "cold wall" is called the ______. A. North Cape Current C. Greenland Current B. Labrador Current D. North Atlantic Current

22 1679 Ref: Ocean, Current, Labrador C Which current is responsible for the movement of icebergs into the North Atlantic shipping lanes? A. Iceland Current C. Labrador Current B. Baltic Current D. Baffin Current

23 1107 Ref: Ocean, Current, North Equatorial D The north equatorial current flows to the ______. A. east C. southwest B. northeast D. west

24 382 Ref: Ocean, Current, Oyashio D Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the ______. A. Alaska Current C. Kuroshio Current B. Subarctic Current D. Oyashio Current

25 604 Ref: Ocean, Current, Sargasso A In the Sargasso Sea there are large quantities of seaweed and no well defined currents. This area is located in the ______. A. Central North Atlantic Ocean C. Western North Pacific Ocean B. Caribbean Sea D. area off the west coast of South America

26 1681 Ref: Ocean, Current, South Atlantic A Which current would you encounter on a direct passage from southern Africa to Argentina, South America? A. South Atlantic B. South Equatorial C. Agulhas D. Guinea

27 1205 Ref: Ocean, Current, Speed A The speed of an ocean current is dependent on ______. A. the density of the water C. the presence of a high pressure area near it B. the air temperature D. underwater soil conditions

28 1219 Ref: Ocean, Current, West Wind Drift C The steady current circling the globe at about 60°S is the ______. A. Prevailing Westerly C. West Wind Drift B. Sub-Polar Flow D. Humboldt Current

29 1267 Ref: Ocean, Current, West Wind Drift A The West Wind Drift is located ______. A. near 60°S B. on each side of the Equatorial Current C. in the North Atlantic between Greenland and Europe D. in the South Pacific near 5°S

30 557 Ref: Ocean, Definition, Bore B In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream, and is called a ______. A. seiche C. boundary wave B. bore D. surge

31 1109 Ref: Ocean, Definition, Continental Shelf B The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the ______. A. abyssal plain C. borderland B. continental shelf D. offshore terrace

32 1783 Ref: Ocean, Definition, Coriolis C Which statement(s) concerning the effect of Coriolis force on ocean currents is(are) correct? A. The deflection of the current is to the left in the Northern Hemisphere. B. The Coriolis force is greater in the lower latitudes. C. The Coriolis force is more effective in deep water. D. All of the above

33 438 Ref: Ocean, Definition, Fetch B Fetch is the ______. A. distance a wave travels between formation and decay B. stretch of water over which a wave-forming wind blows C. time in seconds required for two crests to pass a given point D. measurement of a wave's steepness

34 1204 Ref: Ocean, Definition, Group Velocity C The speed at which an ocean wave system advances is called ______. A. wave length C. group velocity B. ripple length D. wave velocity

35 1236 Ref: Ocean, Definition, Period B The time interval between successive wave crests is called the ______. A. trough B. period C. frequency D. epoch

36 802 Ref: Ocean, Definition, Swell B Swell is the rise and fall of the ocean's surface due to ______. A. fetch C. local storms B. distant winds D. the pull of the moon

37 803 Ref: Ocean, Definition, Swell B Swells that have outrun the storm are produced in the ______. A. left front quadrant C. rear B. right front quadrant D. directly ahead on the storms projected track

38 1183 Ref: Ocean, Definition, Swell D The rise and fall of the ocean's surface due to a distant storm is known as ______. A. sea C. fetch B. waves D. swell

39 1301 Ref: Ocean, Definition, Trough B Two well-developed high pressure areas may be separated by a ______. A. hill of low pressure C. valley of low pressure B. trough of low pressure D. ridge of low pressure

40 727 Ref: Ocean, Definition, Wave A On mid-ocean waters, the height of a wind-generated wave is not affected by the ______. A. water depth exceeding 100 feet C. wind's velocity B. fetch D. duration of the wind

41 1435 Ref: Ocean, Definition, Wave Height B What is the distance from the bottom of a wave trough to the top of a wave crest? A. Wave length C. Wave breadth B. Wave height D. Wave depth

42 1013 Ref: Ocean, Definition, Wave Length D The length of a wave is the length ______. A. of the wave's crest C. measured from crest to trough B. of the wave's trough D. measured from crest to crest

43 540 Ref: Ocean, Definition, Waves A In mid-ocean, the characteristics of a wave are determined by three factors. What is NOT one of these factors? A. Effect of the moon's gravity C. Wind velocity B. Fetch D. Length of time a wind has been blowing

44 228 Ref: Ocean, Right Whales B A vessel sighting a northern right whale dead ahead should ______. A. maintain course and speed B. alter course to give a wide clearance C. report the whale's position to the Canadian Coast Guard D. All of the above

45 508 Ref: Ocean, Right Whales B If within 500 yards (460m) of a Northern Right Whale you are lawfully obligated to ______. A. turn away from the whale and leave at full speed B. turn away from the whale and leave at slow speed C. slow to bare steerageway until the whale swims away D. stop the vessel and sound repeated blasts on the ship's whistle to scare the whale away

46 641 Ref: Ocean, Right Whales A Information on northern right whales can be found in ______. A. the Coast Pilot C. the Nautical Almanac B. HO 229 D. Ship's Medicine Chest and Medical Aid at Sea

47 647 Ref: Ocean, Right Whales D It is unlawful to approach within how many yards of a northern right whale? A. 200 C. 400 B. 300 D. 500

48 687 Ref: Ocean, Right Whales D Northern right whales can be identified by ______. A. whitish patches of skin on top of the head B. "V" shaped blow easily visible from ahead or behind C. no dorsal fin on the back D. All of the above

49 1139 Ref: Ocean, Right Whales A The population of northern right whales, an endangered species, numbers approximately ______. A. 300 C. 100,000 B. 5000 D. 1,000,000

50 1351 Ref: Ocean, Right Whales C Vessels should maintain a sharp lookout, especially during December through March, when navigating the right whale's only known calving grounds which lie off the coasts of ______. A. Nova Scotia C. Georgia and NE Florida B. Maine and Massachusetts D. California and Mexico

51 1207 Ref: Ocean, Sound, Speed A The speed of sound through ocean water is nearly always ______. A. faster than the speed of calibration for the fathometer B. the same speed as the speed of calibration for the fathometer C. slower than the speed of calibration for the fathometer D. faster than the speed of calibration for the fathometer, unless the water is very warm

52 495 Ref: Ocean, Wave, Counter B If the current and wind are in opposite directions, the sea surface represents ______. A. a greatly reduced wind speed B. a higher wind speed than what really exists C. a lower wind speed than what really exists D. more turbulent winds

53 1010 Ref: Ocean, Wave, Counter B The largest waves (heaviest chop) will usually develop where the wind blows ______. A. at right angles to the flow of the current B. against the flow ofthe current C. in the same direction as the flow of the current D. over slack water

54 1549 Ref: Ocean, Wave, Counter B When a current flows in the opposite direction to the waves, the wave ______. A. length is increased B. height is increased C. velocity increases D. length is unchanged

55 1899 Ref: Ocean, Wave, Counter B You are enroute to Jacksonville, FL, from San Juan, P.R. There is a fresh N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter ______. A. smoother seas and warmer water B. steeper waves, closer together C. long swells D. cirrus clouds

56 1900 Ref: Ocean, Wave, Counter D You are enroute to Savannah, GA, from Recife, Brazil. There is a strong N'ly wind blowing. As you cross the axis of the Gulf Stream you would expect to encounter ______. A. cirrus clouds B. long swells C. smoother seas and warmer water D. steeper waves, closer together

57 496 Ref: Ocean, Wave, Same Direction A If the current and wind are in the same direction, the sea surface represents a wind speed ______. A. lower than actually exists B. higher than actually exists C. that actually exists D. that has no proportional relationship

58 204 Ref: Ocean, Wave, Tsunami C A tsunami is caused by a(n) ______. A. tidal wave B. storm surge caused by a hurricane or tropical storm C. earthquake on the ocean's floor D. tornado

59 1502 Ref: Ocean, Wave, Tsunami B What should you expect when you encounter a tsunami in the open ocean? A. Violent seas from mixed directions B. No noticeable change from the existing sea state C. Winds increasing to gale force from the northwest in the Northern Hemisphere D. A major wave of extreme height and length

60 1865 Ref: Ocean, Wave, Tsunami A You are anchored in the Aleutian Island chain and receive word that a tsunami is expected to strike the islands in six hours. What is the safest action? A. Get underway and be in deep, open-ocean water when the tsunami arrives. B. Increase the scope of the anchor cable and drop the second anchor underfoot at short stay. C. Get underway and be close inshore on the side of the island away from the tsunami. D. Plant both anchors with about a 60° angle between them, and let out a long scope to each anchor.

61 1991 Ref: Ocean, Wave, Tsunami C You are steaming in the open ocean of the North Pacific between the Aleutian Chain and Hawaii. A warning broadcast indicates that an earthquake has occurred in the Aleutians and has generated a tsunami that is predicted to hit Hawaii. What action is necessary for the ship's safety? A. Calculate the tsunami's ETA at your position and turn to a course that will head into the Tsunami. B. Securely stow all loose gear, check deck lashings, and prepare for extreme rolls. C. No special action as tsunamis are inconspicuous in the open ocean D. Prepare for sudden, high-velocity wind gusts from rapidly changing directions.