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WorksheetsNAVAL SCIENCE 2 - 2ND SEM - EOC REVIEW
Total questions: 101
Worksheet time: 60secs
What is the portion of the ship called that lies above water from the waterline to the gunwales?
buoyancy
buoyant force
center of gravity
freeboard
Which identifies that area on a ship below the freeboard and above where water is displaced?
a ship’s center of gravity
a ship’s forecastle
a ship’s quarterdeck
a ship’s waterline
Which BEST describes why a 20,000 ton ship does NOT sink?
The ship’s apparent weight alone determines whether or not it sinks
The buoyant force from the body of water counteracts the weight of the ship, thereby preventing it from sinking
The ship’s density and speed of motion are two factors that contribute to its seaworthiness and prevent it from sinking.
The ship’s superstructure is positioned such that its center of gravity prevents it from sinking
What term is used to describe an object’s weight in air minus the buoyant force supporting it?
apparent weight
buoyant force
density
freeboard
What is the scientific term used to describe how much material is present per unit of volume?
apparent weight
density
gravity
waterline
When a ship is moving on the ocean, around which portion of the ship does it seem to move?
ballast
center of gravity
center of weight
waterline
What is the effect of adding excessive weight on the top of the mast of a ship?
decreased ballasting
decreased stability
increased buoyancy
increased stability
What component on a submarine is absolutely essential to allow it to submerge?
ballast tanks
bow planes
propellers
stern planes
Which factors MOST significantly affect ship stability?
center of gravity and center of buoyancy
ship height and ship width
waterline and freeboard
weight of the ship in air and weight of the ship in water
What law or principle is represented by the following statement: “An object immersed in a fluid feels an upward force equal to the weight of the fluid being displaced by the object”?
Archimedes’ principle
Bernoulli’s principle
Einstein’s law of motion
Einstein’s law of relativity
What term is used to describe the geometric center of the portion of the ship’s hull that is underwater?
center of buoyancy
center of density
center of gravity
center of mass
What is the term used to describe additional water placed low in the ship to improve stability?
ballast
density
gravity
waterline
The Captain of the USS Nassau is getting ready to get underway and receives a forecast of poor weather in his immediate operational area. Prior to departing port what should he ensure is well below the waterline?
center of buoyancy
center of gravity
center of rotation
center of torque
What is the name of the force that tends to right a ship as it rolls?
ballast
buoyancy
density
torque
The Captain of USS Shreveport is underway and receives a forecast of increasingly poor weather in his area of operations. What should be done to make the ship more stable?
add ballast near the keel
add ballast topside
decrease ballast near the keel
decrease ballast topside
In addition to liquids, what other type of materials exert upward buoyant forces?
gases
minerals
newtons
solids
How does adding weight near the keel impact the ship's center of gravity?
The center of gravity is lowered
The center of gravity is moved aft
The center of gravity is moved forward
The center of gravity is raised
When an object less dense than water is placed in water, how will it interact?
It will achieve negative buoyancy
It will achieve neutral buoyancy
It will achieve positive buoyancy
It will achieve variable buoyancy
What type of buoyancy are submarines NOT subject to?
negative buoyancy
neutral buoyancy
positive buoyancy
variable buoyancy
In order for a submarine to submerge, what substance does it place in its ballast tanks?
diesel fuel
oxygen
sand
sea water
Which statement BEST describes the relationship of the “righting arm” to ship stability?
Increased ship stability is achieved by minimizing the righting arm by lowering the center of gravity
Increased ship stability is achieved by maximizing the righting arm by lowering the center of gravity
Increased ship stability is achieved by minimizing the righting arm by raising the center of gravity
Increased ship stability is achieved by maximizing the righting arm by raising the center of gravity
Assuming the weight of one cubic meter of water is 9,800 newtons, what is the apparent weight of a one cubic meter rock that weighs 10,000 newtons in air when submerged in water?
200 newtons
9,800 newtons
10,000 newtons
19,800 newtons
Which of Newton’s laws BEST describe a boat floating on the surface of the water?
Newton’s first law
Newton’s second law
Newton’s third law
Newton’s fourth law
Consider a block of wood floating on water. If you push down on the top of the block until it’s completely submerged, what happens to the buoyant force acting on it?
Decreases
Increases
Remains the same
Depends on how far beneath the water surface it is pushed
What law is represented by the statement “A body in motion tends to remain in motion in a straight line unless acted on by outside forces”?
Aristotle’s Second Law
Galileo’s Second Law
Murphy’s First Law
Newton’s First Law
Which formula represents Newton’s Second Law?
A = fm
F = ma
F = m/a
M = fa
What term is defined as the change in velocity per unit of time?
acceleration
distance
speed
time
What term describes the quantity of material contained in a body?
friction
mass
pounds
weight
What term describes the downward force applied against a body?
aerodynamic force
energy
friction
gravity
What is the English unit for measuring power?
foot-pounds
horsepower
joules
newtons
How fast is a body travelling at Mach 1?
at the speed of light
at the speed of sound
at 300 MPH
at 600 MPH
What determines the path of a body in flight?
Einstein’s laws of motion
Einstein’s law of relativity
Newton’s laws of motion
Newton’s law of relativity
What law or principle states “The total energy in any isolated system remains constant”?
Archimedes Principle
Bernoulli’s Principle
Einstein’s law of motion
Einstein’s law of relativity
Which of Newton’s Laws states that the acceleration of a body is directly proportional to the force acting on it?
first
second
third
fourth
Which is sometimes called the law of inertia?
Newton’s First Law of Motion
Newton’s Second Law of Motion
Newton’s Third Law of Motion
Newton’s Theory of Relativity
Which of Newton’s laws or theories states “For every action there is an equal but opposite reaction”?
Newton’s First Law of Motion
Newton’s Second Law of Motion
Newton’s Third Law of Motion
Newton’s Theory of Relativity
What is the result when a force acts through a distance?
acceleration
mass
velocity
work
What term describes the rate of motion in a given direction?
acceleration
force
Newtonian motion
velocity
Which of the following is NOT an aerodynamic force on a body in flight?
drag
lift
magnitude
thrust
What term describes the amount of the force of gravity on a body at a given location?
friction
mass
volume
weight
What term describes the rate at which work is done or energy is gained or expended?
acceleration
mass
power
volume
What is the acceleration of freely falling bodies on earth?
32 feet per second
64 feet per second
32 feet per second per second
64 feet per second per second
What is a major result of friction?
evaporation
heat
light
loss of mass
In aerodynamics, which term is used to describe acceleration and is often measured in terms of the standard acceleration of gravity?
F forces
G forces
F quotient
G quotient
What is the speed of light?
186,000 feet per second
186,000 meters per second
186,000 miles per second
186,000 miles per hour
What is another term for one newton-meter?
Gram
Joule
Pound
Watt
How many watts are in one horsepower?
446
476
746
776
If the sum of all forces acting on a moving object is zero, what will the object do?
accelerate uniformly
change the direction of its motion
continue moving with constant velocity
slow down and stop
If an object starting at 10 ft/sec reaches a velocity of 34 ft/sec after 6 secs, what is its acceleration in feet per second squared?
2
4
6
8
Which aerodynamic force is created by air resistance?
Drag
Lift
Thrust
Weight
Why do you feel more tired when you run up two flights of stairs instead of walking up them?
you do more work when you run than when you walk
a running person has more inertia than a walking person
your power output is greater when you run than when you walk
the gravitational acceleration is greater on a running person than on a walking person
What percent of the earth’s diameter is the moon?
10
19
27
33
Which characteristic of the moon results in the lack of gradual daily temperature changes and the absence of sound?
the moon’s lack of an atmosphere
the moon’s proximity to the sun
the moon's rotation
the moon’s size
Why are lunar mountain ranges so rugged?
they are covered with regolith
they are frequently impacted by asteroids
they are frequently sprayed by breccia
they are not eroded by wind, water or ice
What is the name given to smooth plains on the moon's surface which were created when old craters were filled with magma or volcanic ash?
lake beds
mascons
maria
tektites
Which is a characteristic of moonquakes?
They are nonexistent
They are a new phenomena
They cause the moon to vibrate for extended periods of time
They have severe tremors lasting only a few seconds
Which answer below BEST describes the physical relationship of the earth, moon and sun during a lunar eclipse?
earth passes through the conical shadow of the moon
moon gets between the sun and the earth
moon passes through the conical shadow of the earth
sun gets between the earth and the moon
On average, the moon is about how far from the earth?
149,000 miles
200,000 miles
239,000 miles
350,000 miles
What physical features can be observed on the surface of the moon?
oceans, rivers and plains
volcanoes, rivers and craters
deserts, oceans and mountain ranges
craters, mountain ranges and plains
The MOST conspicuous crater on the moon is located in it's southern hemisphere. What is this crater's name?
The Sea of Tranquility
Copernicus
Bailly
Tycho
One cause of erosion on the moon is from crashing meteorites. These crashing meteorites spray the surface of the moon with broken rocks. What are these rocks called?
breccia
mare
mascons
tektites
The moon’s surface is covered with many cracks which are similar to shallow flat-bottomed river-beds on earth. What are these features called?
breccia
macons
regolith
rilles
What term is used to describe the phenomena when the visible moon appears to get smaller after the full moon?
phase
shrink
wane
wax
A day or so after a new moon, the moon is seen as a thin bow-shaped figure. What is this figure called?
crescent
eclipsed
gibbous
waxing
At new moon what is the alignment of the earth, moon and sun?
the earth is between the sun and the moon
the moon is between the earth and the sun
the moon is closest to the earth
the sun is between the earth and the moon
What term is used to describe the moon between its first and last quarters, when more than half of surface moon is visible?
crescent moon
full moon
gibbous moon
new moon
Where did the Apollo 11 astronauts set up a moonquake detector?
Bailly
Copernicus
The Sea of Tranquility
Tycho
Which of the following is NOT a practical reason to explore our moon?
it would be an ideal place to set up astronomical observatories and radiotelescopes
it would be an ideal place to launch expeditions to Mars or an asteroid
we would someday be able to mine its mineral wealth
we would someday be able to tap into its vast supply of water ice
What is the temperature range on the moon?
100 to 0 K
270 to -240 C
270 to -240 F
750 to -750 F
In which direction and at what speed is the moon’s orbit moving in comparison to the earth?
away at the rate of 3 centimeters per year
away at the rate of 3 feet per year
closer at the rate of 3 centimeters per year
closer at the rate of 3 feet per year
During which space exploration was the backside of the moon photographed?
Apollo missions
International Space Station missions
Mercury missions
Pioneer expeditions
What term is used to describe the phenomena when the visible moon appears to get larger after the new moon?
phase
shrink
wane
wax
How long does it take the moon to circle the earth?
27 and a third days
28 days
29 days
29 and a half days
What is a blue moon?
when the moon appears blue in the winter
when the moon is full and in the perigee of its orbit
when a second full moon appears during the same calendar month
when you look up at the new moon and can still see its shadow in the night sky
What is the phenomenon called when a new moon is faintly visible during the day because its dark side is illuminated by light reflecting off the earth?
blue moon
eclipse
planetshine
supermoon
Which region of the moon has the youngest rocks?
Poles
Maria
Equator
Highlands
How old is the sun?
4.6 million years
14.6 million years
4.6 billion years
14.6 billion years
What percentage of all the matter in our solar system is contained in the sun?
50.52%
68.65%
75.58%
99.86%
What is the definition of an astronomical unit (AU)?
The distance from the earth to the moon
The distance from the earth to the sun
The distance from the moon to the sun
The distance from the sun to the next nearest star
What element makes up 75% of the sun’s mass?
Helium
Hydrogen
Nitrogen
Oxygen
What is the earth’s average orbital radius from the sun?
78 million miles
85 million miles
93 million miles
105 million miles
Which answer below BEST describes the physical relationship of the earth, moon and sun during a solar eclipse?
Earth passes through the conical shadow of the moon
Earth gets between the sun and the moon
Moon passes through the conical shadow of the earth
Sun gets between the earth and the moon
How much stronger is the sun’s gravitational attraction to that of the earth’s?
17.2 times
27.9 times
30.1 times
33.5 times
What is the name of the physical surface of the sun?
Chromosphere
Corona
Heliosphere
Photosphere
Which statement about sunspots is true?
Area of the photosphere that is darker than the surrounding areas because they are cooler.
Area of the photosphere that is lighter than the surrounding areas because they are cooler.
Area of the photosphere that is darker than the surrounding areas because they are hotter.
Area of the photosphere that is lighter than the surrounding areas because they are hotter.
What is the name of the outer layer of the sun’s atmosphere?
Chromosphere
Corona
Heliopause
Photosphere
What is the definition of solar wind?
A stream of charged particles released from the sun’s upper atmosphere consisting of mostly electrons and protons
A stream of charged particles released from the sun’s upper atmosphere consisting of mostly neutrons and photons
Wind generated on earth due to temperature differences caused by the heat of the sun
Wind generated on the sun due to varying sunspot activity
How much larger than the earth is the sun?
52 times
109 times
148 times
182 times
What causes the Aurora in the extreme northern and southern latitudes?
Heating of the earth’s atmosphere caused by radiation from the sun
Interaction between the solar wind and the earth’s magnetic field
Interaction between the solar wind and the earth’s atmosphere
Interaction between ultraviolet light from the sun and the earth’s atmosphere
What is a “Coronal Mass Ejection” also known as?
Aurora
Corona
Solar flare
Sunspot
What type of energy found on earth is a direct result of the sun’s impact??
Nuclear energy
Tidal energy
Volcanic energy
Wind energy
What percentage of the sun’s energy escapes in the form of visible light?
40%
50%
60%
70%
Of the parts of the sun listed below, which is the hottest with temperatures reaching over a million degrees celsius?
Corona
Chromosphere
Heliosphere
Photosphere
When the sun expends most of its energy in another 5 or 6 billion years, what will it become?
A red dwarf
A red giant
A supernova
White giant
How long does it take light from the sun to reach the earth?
2 minutes
4 minutes
6 Minutes
8 minutes
What is a light-year a measurement of?
Brightness
Distance
Time
Speed
How far is the sun from the center of the Milky Way Galaxy?
100 light years
1500 light years
18,000 light years
25,000 light years
How long does it take the sun to orbit the Milky Way Galaxy?
125-150 thousand years
225-250 thousand years
125-150 million years
225-250 million years
What causes the polar auroras?
Interaction between the solar wind and the earth’s ozone layer
Interaction between the solar wind and the earth’s magnetic field
Interaction between the sunlight and the earth’s ozone layer
Interaction between sunlight and the earth’s magnetic field
How far does the sun’s heliosphere extend into space?
To Mercury
To Earth
To Jupiter
To the edge of the solar system.
Why is it important to learn skills that you were never taught to thrive, grow, or develop well in today’s society?
To help control of yourself.
So you do not have to do certain jobs like keeping your room clean, being home on time, doing your homework, or attending classes.
No control for you do those things, even when there are other things you’d rather do.
Inspire each cadet with preparation, and the will to reach their highest potential for development of a personal blueprint toward the path to new heights for life after graduation.
