Tides & Currents Flashcards
In the north east of the US, we experience 2 high and 2 low tides each day. What do we call this type of tide cycle?
A. Spring
B. Mixed
C. Semi-diurnal
D. Diurnal
C. Semi-diurnal
What type of tide produces higher than average high tides and lower than average low tides?
A. Extreme
B. Nodal
C. Neap
D. Spring
D. Spring
What type of tide is experienced when the moon is in the first quarter or last quarter?
A. Spring
B. Neap
C. Mixed
D. Diurnal
B. Neap
The point where the vertical rise of the tide has reached its peak is called the __________ of the tide.
A. Epoch
B. Top
C. Stand
D. Spring
C. Stand
The point where tidal current flow has reached its minimum velocity is called _____________ water?
A. Stand
B. Slack
C. Low
D. Still
B. Slack
A Diurnal tide cycle will have how many high tides in a 24 hour period?
A. 0
B. 1
C. 2
D. 4
B. 1
It takes the moon approximately __________ days to orbit the earth?
A. 21
B. 28
C. 30
D. 31
B. 28
Depth soundings on most NOAA charts will be given in reference to ____________?
A. Mean low water
B. Mean high water
C. Mid lower low water
D. Mean lower low water
D. Mean lower low water
On a NOAA chart, vertical clearances and height of shore side structures such as lighthouses is given in reference to _____________?
A. Mean high water
B. Mean lower low water
C. Chart datum
D. Mean higher high water
A. Mean high water
The time and heights of high and low tides may be found in what reference volume?
A. Light List
B. Chart One
C. Tide Tables
D. Tidal Current Tables
C. Tide Tables
When the tide is rising and we are approaching high water, this is called a _____________ tide?
A. Incoming
B. Ebb
C. Flood
D. Washing
C. Flood
The difference in height between consecutive high and low tides is called _____________?
A. Tidal duration
B. Tidal epoch
C. Tidal flow
D. Tidal range
D. Tidal range
Due to wind and changes in atmospheric pressure, this tide is called a ___________________?
A. Astronomical tide
B. Max tide
C. Meteorological tide
D. Spring tide
C. Meteorological tide
Tides are the periodic rise and fall of a body of water due to gravitational pulls between the __________________?
A. Sun, Jupiter and Earth
B. North star, moon and sun
C. Stars, Earth and sun
D. Sun, moon and Earth
D. Sun, moon and Earth
The Tidal Day is ___________ hours?
A. 23.84
B. 24.84
C. 24.48
D. 23.48
B. 24.84
The moon’s gravitational force is greater than the sun and therefore has a greater effect on tides.
A. True
B. False
A. True
Spring tides have a larger tidal range than Neap tides?
A. True
B. False
A. True
The __________________ causes wind currents to deflect to the right in the Northern Hemisphere?
A. Tropic Effect
B. Sub-Tropical Effect
C. Banking Effect
D. Coriolis Effect
D. Coriolis Effect
In the open ocean tidal currents are said to be ________________ because the current spins _________________ in a tidal period?
A. Counter- rotary, 360 degrees counterclockwise
B. Rotary, 360 degrees clockwise
C. Rotary, 360 degrees counterclockwise
D. Sub-rotary, 360 degrees clockwise
C. Rotary, 360 degrees counterclockwise
The prudent mariner must always factor in tides and currents when approaching harbors, inlets and navigable waters in both inland and international waters?
A. True
B. False
A. True
