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Tides are waves with very large _______.
(a) crests
(b) troughs
(c) wavelengths
(d) travel speed
(e) antinodes

(c) wavelengths

Tides act like _______.
(a) shallow water waves
(b) capillary waves
(c) rogue waves
(d) deep water waves
(e) storm surges

(a) shallow water waves

The primary force(s) that cause(s) tides in the sea is (are) ____________.
(a) coastal earthquakes and landslides
(b) wind and storms at sea
(c) the gravitational attraction of the moon and the sun
(d) the gravitational attraction of Mars and Venus
(e) the rotation of the moon on its axis

(c) the gravitational attraction of the moon and the sun

The strength of gravitational attraction varies directly with _______.
(a) the tilt of the Earth's axis with respect to the sun
(b) latitude and longitude
(c) the masses of the interacting bodies and the distance separating them
(d) the composition of the interacting bodies

(c) the masses of the interacting bodies and the distance separating them

Which body has the most profound influence on ocean tides?
(a) Sun
(b) Moon
(c) Jupiter
(d) Venus
(e) All of the bodies listed have an equal influence.

(b) Moon

The force that pulls an orbiting body toward the center of that orbit is called __________.
(a) amphidromic
(b) centrifugal
(c) centripetal
(d) gravitational
(e) tidal

(c) centripetal

The tide-generating force is inversely proportional to the cube of the distance.
(a) True
(b) False

(a) True

The difference between centripetal forces and gravitational forces is called the __________.
(a) diurnal force
(b) dynamic force
(c) lunar force
(d) residual force
(e) tidal force

(d) residual force

The center of mass of the Earth-Moon system is called the __________.
(a) aphelion
(b) apogee
(c) barycenter
(d) perigee
(e) perihelion

(c) barycenter

The barycenter follows __________.
(a) a path that is perpendicular to the Earth's ecliptic
(b) a pattern that parallels the Moon's orbit
(c) a smooth orbit around the Sun
(d) a wavy path around the Sun
(e) the Earth's declination

(c) a smooth orbit around the Sun

The tide-generating force varies __________.
(a) directly with the cube of the distance between the objects
(b) directly with the square of the distance between the objects
(c) directly with the square of the distances of the objects divided by the product of the masses
(d) inversely with the cube of the distance between the objects
(e) inversely with the square of the distance between the objects

(d) inversely with the cube of the distance between the objects

The tide-generating force varies __________.
(a) directly with the product of the object masses
(b) directly with the product of the cube of the object masses
(c) directly with the square of the distance between the objects
(d) inversely with the product of object masses
(e) inversely with the product of the cube of the object masses

(a) directly with the product of the object masses

The center of mass about which the Earth and the Moon rotate is _______.
(a) near the center of the Earth
(b) near the center of the Moon
(c) half-way between the Earth and the Moon
(d) between the Earth's surface and its core

(d) between the Earth's surface and its core

The sun's gravitational effect on the Earth is much less than that of the moon because _______.
(a) the moon is smaller than the sun
(b) the moon moves more rapidly than the sun
(c) the sun is made of gas and the moon is made of rocks and minerals
(d) the sun is so much farther from the Earth than the moon

(d) the sun is so much farther from the Earth than the moon

The side of Earth facing the moon will experience a high tide, while the opposite side of Earth will
have a ____________.
(a) low tide
(b) time of no tidal action
(c) high tide also
(d) tide that cannot be predicted

(c) high tide also

The tidal bulge on the side of the Earth opposite the moon is due to _______.
(a) centrifugal force
(b) tidal bore activity
(c) ebb currents
(d) tidal resonance
(e) spring tides

(d) tidal resonance

Tractive forces ____________.
(a) are responsible for the tides
(b) cause water to flow away from some ocean areas
(c) cause water to flow toward some ocean areas
(d) are influence ocean and atmosphere
(e) all of the above

(e) all of the above

The tides at any one locality will result from the interaction of ____________.
(a) sun, moon, and Earth
(b) elliptical orbits of the moon and Earth
(c) rotation of Earth
(d) size, shape, and depth of the ocean basin
(e) all of these things

(e) all of these things

The crest of the tide is called _______.
(a) high tide
(b) low tide
(c) tidal range
(d) neap tide
(e) spring tide

(a) high tide

If a high tide occurred at a location with diurnal tides at 8 A.M. on a particular day and you wanted to
be there at the next high tide, at what time should you arrive?
(a) 8:00 P.M.
(b) 8:25 P.M.
(c) 8:00 A.M.
(d) 8:50 A.M.

(d) 8:50 A.M.

The trough of the tide is called _______.
(a) high tide
(b) low tide
(c) tidal range
(d) neap tide
(e) spring tide

(b) low tide

Compared with a solar day, a lunar day is __________.
(a) equal to a solar day
(b) half the length of a solar day
(c) longer than a solar day
(d) shorter than a solar day
(e) twice the length of a solar day

(c) longer than a solar day

The angular distance of the orbital plane of the Sun or Moon above or below the Earth's equatorial
plane is called the __________.
(a) apogee
(b) declination
(c) ecliptic
(d) perihelion
(e) syzygy

(b) declination

A spring tide __________.
(a) has moderate high and low tides
(b) occurs at a blue moon
(c) occurs at the vernal equinox
(d) has higher than normal high tides and lower than normal low tides
(e) has very little difference between high and low tides

(d) has higher than normal high tides and lower than normal low tides

A neap tide has __________.
(a) moderately high tidal range
(b) moderately low tidal range
(c) no tidal range
(d) very high tidal range
(e) very low tidal range

(e) very low tidal range

Spring tide occurs about __________.
(a) once per month
(b) once per season
(c) once per year
(d) twice per month
(e) twice per year

(d) twice per month

Neap tides occur __________.
(a) at summer and winter solstice
(b) during a storm surge
(c) when the moon is full or new
(d) when the moon is at quadrature
(e) when the sun is at perihelion or aphelion

(d) when the moon is at quadrature

When the earth is at its greatest distance from the sun, it is said to be at __________.
(a) apogee
(b) aphelion
(c) perigee
(d) perihelion
(e) proxigean

(b) aphelion

The side of the Earth that faces the moon experiences a high tide, the side of the Earth that is opposite from the moon will have a(n) __________.
(a) high tide
(b) low tide
(c) neap tide
(d) proxigean tide
(e) spring tide

(a) high tide

The vertical difference between high and low tides is called the __________.
(a) ebb tide
(b) flood tide
(c) tidal bore
(d) tidal height
(e) tidal range

(e) tidal range

Tidal ranges will be greatest when the Earth and the Moon are at __________.
(a) apogee
(b) aphelion
(c) perigee
(d) perihelion
(e) proxigean

(e) proxigean

The "tidal range" is the _______.
(a) distance between high and low water marks on a shoreline
(b) the vertical distance between high tide and low tide
(c) the area over which a particular tidal pattern will be observed
(d) the length of time between two successive high tides

(b) the vertical distance between high tide and low tide

High tides are highest and low tides are lowest during _______.
(a) neap tides
(b) spring tides
(c) ebb tides
(d) semidiurnal tides

(a) neap tides

When the sun and moon are in a line with Earth, the ____________.
(a) gravitational attraction will be less
(b) difference between high and low tides will be minimal
(c) arrival of high tide will be delayed
(d) highest high and lowest low tides will occur

(d) highest high and lowest low tides will occur

Spring tides will occur _______.
(a) at the new moon
(b) at the quarter moon
(c) at the full moon
(d) at both A and B
(e) at both A and C
(f) at both B and C

(e) at both A and C

When the Earth, Moon, and Sun are oriented at a 90° angle to each other, which type of tides occur?
(a) spring
(b) diurnal
(c) neap
(d) mixed

(c) neap

High tide is lower than normal and low tide is higher than normal during _______.
(a) neap tides
(b) spring tides
(c) ebb tides
(d) semidiurnal tides

(d) semidiurnal tides

The plane through the ellipse that marks the revolution of the Earth around the Sun is called the
ecliptic.
(a) True
(b) False

(a) True

A lunar day is shorter than a solar day.
(a) True
(b) False

(b) False

There is no horizontal tide-generating force on Earth at points directly below and opposite the Moon.
(a) True
(b) False

(a) True

The sun and the moon have relatively equal tide-generating forces on earth.
(a) True
(b) False

(b) False

The barycenter follows a smooth orbit around the Sun.
(a) True
(b) False

(a) True

Tides are much greater during apogee than during perigee.
(a) True
(b) False

(b) False

A spring tide occurs once per month.
(a) True
(b) False

(b) False

Which of the following is NOT one of the categories of tides?
(a) diurnal
(b) mixed
(c) semidiurnal
(d) triurnal

(d) triurnal

Diurnal tides are more often found in _______.
(a) high latitudes
(b) mid-latitudes
(c) low latitudes
(d) large bays

(a) high latitudes

Mixed tides are more often found in _______.
(a) high latitudes
(b) shallow inlets
(c) mid-latitudes
(d) low latitudes

(c) mid-latitudes

Semidiurnal tides are more often found in _______.
(a) high latitudes
(b) mid-latitudes
(c) low latitudes

(c) low latitudes

A tide pattern of one high and one low each day describes a ____________.
(a) diurnal tide
(b) mixed tide
(c) solar tide
(d) semidiurnal tide

(a) diurnal tide

A tide pattern with two high tides (one higher than the other) and two low tides (one lower than the
other) each day is called a ____________.
(a) diurnal tide
(b) mixed tide
(c) solar tide
(d) semidiurnal tide

(b) mixed tide

The tide patterns characteristic of southeastern Florida [where we are] are ____________.
(a) semi-diurnal mixed tides
(b) diurnal tides
(c) reversing tides
(d) amphidromic tides
(e) semidiurnal tides

(b) diurnal tides

The center of an open-ocean tidal system is called a(n) __________.
(a) cotidal point
(b) amphidromic point
(c) ebb current
(d) tidal bore

(b) amphidromic point

The center of an open ocean tidal system is called a(n) __________.
(a) amphidromic center.
(b) cotidal center
(c) rotary center
(d) seiche
(e) tidal flux

(a) amphidromic center.

Due to the shape of the North Sea, it develops two amphidromic points.
(a) True
(b) False

(a) True

An amphidromic point is ____________.
(a) a "no tide" point in the ocean around which the tide crest rotates through one tidal cycle
(b) a place in the ocean where tides are highest
(c) a place in the ocean where tidal datum is displaced to the right (in the northern hemisphere),
or to the south (in the southern hemisphere)
(d) a "no tide" point at the coast where there is a daily high tide, but no low tide

(a) a "no tide" point in the ocean around which the tide crest rotates through one tidal cycle

An area that experiences semidiurnal tides will have __________.
(a) one high tide and one low tide daily
(b) one high tide and two low tides daily
(c) one low tide and two high tides daily
(d) two high tides and two low tides of nearly equal height daily
(e) two unequal low and high tides daily

(d) two high tides and two low tides of nearly equal height daily

An area that experiences diurnal tides will have __________.
(a) one high tide and one low tide daily
(b) one high tide and two low tides daily
(c) one low tide and two high tides daily
(d) two high tides and two low tides of nearly equal height daily
(e) two unequal low and high tides daily

(a) one high tide and one low tide daily

The most common tidal pattern around the world are __________.
(a) diurnal tides
(b) mixed tides
(c) proxigean tides
(d) semidiurnal tides
(e) spring tides

(b) mixed tides

To make accurate coastal tidal predicting, one must consider __________.
(a) diurnal tides
(b) partial tides
(c) semidiurnal tides
(d) tidal bores
(e) tidal currents

(e) tidal currents

In the United States one can find semidiurnal tides along the __________.
(a) Atlantic coast
(b) Gulf of Alaska
(c) Gulf of Mexico coast
(d) Florida Keys
(e) Pacific coast

(a) Atlantic coast

A semidiurnal tide is common along the Pacific coast of the United States.
(a) True
(b) False

(b) False

A full tidal cycle is __________.
(a) 12 hours in duration
(b) 12 hours 25 minutes in duration
(c) 24 hours in duration
(d) 24 hours and 50 minutes in duration
(e) 48 hours in duration

(d) 24 hours and 50 minutes in duration

In the United States one can find mixed tides along the __________.
(a) Atlantic coast
(b) Cape Cod
(c) Gulf of Mexico coast
(d) Florida Keys
(e) Pacific coast

(e) Pacific coast

The Bay of Fundy is well known for which tidal characteristic?
(a) large tidal bore
(b) two amphidromic points
(c) very large seiche
(d) very low tidal range
(e) very high tidal range

(e) very high tidal range

This wave formed on a river by the flood tide current is called a __________
(a) ebb tide
(b) flood tide
(c) seiche
(d) tidal bore
(e) tsunami

(d) tidal bore

Water flowing out of an enclosed basin due to the tides is called __________.
(a) ebb current
(b) flood current
(c) neap tide
(d) spring tide
(e) tidal bore

(a) ebb current

The maximum tidal currents are reported __________.
(a) about half way between high and low tides
(b) at high tide
(c) at low tide
(d) during neap tides
(e) in the intertidal zone

(a) about half way between high and low tides

Tidal current can produce rotary currents called __________.
(a) ebb currents
(b) flood currents
(c) shoals
(d) tidal bores
(e) whirlpools

(e) whirlpools

Which of the following is a tidal current?
(a) both ebb tides and flood tides
(b) both neap tides and spring tides
(c) ebb tide
(d) flood tide
(e) spring tide

(a) both ebb tides and flood tides

The seaward flow of water due to tidal forces through an inlet is called ebb current.
(a) True
(b) False

(a) True

Tidal currents can result in a rotary direction of water flow called ____________.
(a) slack water
(b) ebb and flood tides
(c) whirlpools or maelstroms
(d) amphidromic points

(c) whirlpools or maelstroms

As sea level moves up and down with the tide, water is transferred toward the coast as ________
currents.
(a) hydraulic
(b) geostrophic
(c) ebb
(d) flood
(e) undertow

(d) flood

A wave of water moving up a river, initiated by tidal action and normal resonances within a river
estuary, is called a ____________.
(a) tidal node or amphidromic point
(b) tidal wave
(c) tidal gyre
(d) tidal current
(e) tidal bore

(e) tidal bore

Tidal bores usually occur ____________.
(a) in rivers or long narrow bays
(b) in open ocean far from land
(c) around islands
(d) in enclosed basins such as the Mediterranean

(a) in rivers or long narrow bays

The only marine energy source being successfully exploited on a large scale is ____________.
(a) tidal currents
(b) waves
(c) salinity differences
(d) thermal gradient
(e) open ocean currents

(a) tidal currents

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