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WorksheetsEarth's Magnetic Field Quiz
Total questions: 35
Worksheet time: 26mins
What is the main theory that explains Earth's magnetic field?
Coriolis Effect
Dynamo Theory
Plate Tectonics
Gravitation Theory
Which layer of Earth is primarily responsible for generating the magnetic field?
Inner Core
Mantle
Crust
Outer Core
What causes the movement in Earth's outer core that leads to magnetism?
Wind currents
Rotation of Earth
Convection currents of molten metals
Gravity
What is the Coriolis Effect's role in Earth's magnetism?
Generates magnetism directly
Aligns convection currents to stabilize the magnetic field
Causes tectonic plate movement
Prevents solar radiation
Earth's magnetic poles are:
Exactly aligned with the geographical poles
Static and unchanging
Slightly offset from the geographical poles
Non-existent
What is a geomagnetic reversal?
Earth's rotation stops
A change in direction of Earth's magnetic poles
Earth's magnetic field disappears
Poles move toward the equator
Which area surrounding Earth protects it from solar wind and cosmic radiation?
Stratosphere
Magnetosphere
Ozone layer
Mesosphere
Which phenomenon allows the Earth to act like a giant magnet?
Crustal composition
Dynamo effect in the outer core
Mantle convection
Atmospheric pressure
What is magnetic declination?
Angle difference between True North and Magnetic North
Angle of the magnetic dip
Strength of Earth's magnetic field
Distance between magnetic poles
What instrument primarily uses Earth's magnetic field for navigation?
Gyroscope
Radar
Magnetic Compass
Sextant
What is the purpose of the lubber line on a compass?
Correct compass deviation
Aligns with ship's fore and aft line for heading reference
Stabilizes compass in rough weather
Reduces friction
What term describes the deviation caused by the magnetic properties of a vessel?
Variation
Declination
Deviation
Inclination
What type of compass is typically filled with liquid to dampen movement?
Dry card compass
Gyroscopic compass
Magnetic card compass
Wet card compass
Which part of the compass bowl is used to keep it level on a rolling ship?
Lubber line
Gimbals
Compass card
Binnacle
What is magnetic dip?
Horizontal magnetic field inclination
Vertical angle of Earth's magnetic field at different latitudes
Magnetic field intensity
Compass deflection angle
Which material is often used for constructing the compass bowl?
Steel
Brass
Iron
Copper
A Flinders bar is used to correct for:
Declination
Permanent vertical magnetism in a ship
Magnetic dip
Compass heading
What does the heeling magnet correct?
Lateral deviation
Both permanent and induced magnetism effects
Horizontal deviation
Inclination
Magnetic susceptibility measures:
Magnetization of a material under an applied field
Magnetic field strength
Earth's magnetic field change
Compass calibration
Which type of iron has domains that return to random alignment when the field is removed?
Hard iron
Soft iron
Ferromagnetic iron
Paramagnetic iron
A diurnal change in variation occurs due to:
Secular variation
Earth's rotation and magnetic pole shift
Ocean currents
Compass inaccuracy
Which component in the magnetic compass is typically made of aluminum?
Gimbals
Float
Lubber line
Compass card
What does Archimedes' principle in compass fluid help reduce?
Magnetic deviation
Compass weight
Compass alignment friction
Compass declination
Which term refers to Earth's magnetic field vector?
Declination
Intensity
Dip
Variation
Secular variation describes changes in Earth's magnetic field over:
A single day
A year or more
A month
Every few hours
The region where the magnetic field is vertical is called:
Magnetic equator
Magnetic pole
Magnetosphere
Compass meridian
Magnetic North is defined as:
True North
Geographic North
North-seeking pole direction of compass
Equatorial North
Sub-permanent magnetism in a ship is influenced by:
Aging, vibration, and cruising
Changes in ocean temperature
Earth's gravitational pull
Iron in the ship's structure
What type of compass is considered the oldest navigational tool?
Marine sextant
Dry card compass
Astrolabe
Magnetic compass
The angular difference between magnetic and true meridian is known as:
Dip
Inclination
Variation
Declination
The compass binnacle is often constructed from:
Iron
Teak wood and brass
Steel and copper
Plastic
The force proportional to Earth's magnetic field strength is:
Compass deviation
Dip angle
Field intensity
Geomagnetic pole distance
Which metal is commonly found in both the Earth's inner and outer core?
Aluminum
Nickel
Silver
Gold
A ship's induced magnetism:
Remains constant after launch
Is acquired when placed in Earth's magnetic field
Causes permanent magnetic deviation
Increases over time
What is the purpose of the compass' lubber line?
Reduces friction
Prevents rotation
Indicates ship's heading
Alters compass fluid expansion
