WorksheetsMagnetism and Earth Science
Total questions: 32
Worksheet time: 16mins
The location of the strongest magnetic forces is the ____.
electromagnets
magnetic domains
magnetic fields
magnetic poles
Which diagram best represents a magnetic field between two magnetic fields?
A
B
C
D
Which of the following situations is NOT true for magnets?
like poles repel each other
unlike poles repel each other
north poles repel each other
A North pole and a South pole will attract each other
Electromagnetic induction is the process of producing an electric current by moving a loop of wire ____.
through a magnetic field
through a magnetic domain
around an iron core
around a magnetic pole
In the diagram below, a steel paper clip is attached to a string, which is attached to a table. The clip remains suspended beneath a magnet.
As the magnet is lifted, the paper clip begins to fall as a result of
a decrease in the magnetic field strength near the clip.
a decrease in the magnetic properties of the clip.
an increase in the potential energy of the clip.
an increase in the gravitational field strength near the magnet.
The diagram below shows the magnetic field surrounding a bar magnet. The closer together the lines of force, the stronger the magnetic field. According to the diagram, where is the magnetic field the strongest?
around the North pole
around the South Pole
around both poles
in the center of the magnet
Which compass needle orientation in the figure above might correctly describe the magnet’s field at that point?
a
b
c
d
A student wanted to find out how to make an electromagnet stronger. The results of his experiment are listed in the table below.
According to these data, which of the following does NOT make an electromagnet stronger?
increasing the number of batteries that are connected
increasing the number of wire turns around the core
increasing the number of nails inside the core
increasing the number of tacks used
The function of an electric motor is to change ____.
chemical energy to electrical energy
electrical energy to chemical energy
electrical energy to mechanical energy
mechanical energy to electrical energy
The function of a generator is to change ____.
chemical energy to electrical energy
electrical energy to chemical energy
electrical energy to mechanical energy
mechanical energy to electrical energy
In the United States, power lines can carry power voltages as high as 750,000 V, a step-down transformer reduces the voltage to ____ for home use.
60 V
120V
60 Hz
120 Hz
Which of the following describes the direction of the electric current in AC?
is direct
is constant
changes regularly
changes irregularly
What is structure B? What happens to it when energy flows?
It is a permanent magnet, nothing happens when the energy flows.
It is a coil of wire with an iron core that will become an electromagnet when energy flows through it.
Is is a motor that spins faster when energy flows through it.
It is the energy sources that increases in power as more energy flows through it.
Does the figure represent a motor or generator? Explain your answer.
generator; electrical energy is being converted from the motion of the fan
Generator; mechanical energy is being converted from electrical energy of the battery
Motor; electric energy is being converted from the mechanical energy of the fan
Motor; mechanical energy is being produced from the electrical energy of the batery
What happens when to the rotation of the coil (in the figure above) if the current flowing through it is increased?
The rotation will also increase (spin faster)
The rotation will decrease (spin slower)
The rotation will not change
A magnetic compass is placed near an insulated copper wire. When the wire is connected to a battery and a current is created, the compass needle moves and changes its position. Which is the best explanation for the production of a force that causes the needle to move?
The copper wire magnetizes the compass needle and exerts the force on the compass needle.
The compass needle magnetizes the copper wire and exerts the force on the compass needle.
The insulation on the wire becomes charged, which exerts the force on the compass needle.
The current in the wire produces a magnetic field that exerts the force on the compass needle
What effect does the transformer below have on the voltage?
It steps up the voltage
It steps down the voltage
It has no effect on the voltage
It cancels out the voltage
An electron moving at constant speed produces
a magnetic field only
an electric field only
bot magnetic and electric field
neither a magnetic nor an electric field
The layer on which the tectonic plates move is the ____.
lithosphere
asthenosphere
core
crust
When the heat source is removed from a fluid, convection currents in the fluid will
speed up
change directions
eventually stop
continue at the same rate forever
How did scientists discover that rocks farther away from the mid-ocean ridge were older than those closer to it?
by observing eruptions of molten material on the sea floor
by mapping rocks on the sea floor using sonar and magnetic alignment
by determining the age of rock samples obtained by drilling on the sea floor
by measuring how fast sea-floor spreading occurs
What type of plate boundary occurs at location X?
Transform
Convergent
Divergent
What type of plate boundary occurs at location Y?
Transform
Convergent
Divergent
What feature occurs at Y, and how does it form?
Y is a mountain formed by volcanic activity
Y is an ocean trench formed by subduction of one plate under another
Y is a volcanic island formed by the ocean floor melting under the continent
Y is the ocean floor formed by sea floor spreading
What is happening at Z?
The continent is forcing the ocean floor up into the mountains
Plate C is pushing up on plate B
The edge of plate A is pushing B into C
The edge of plate B is plunging beneath plate C and melting in the mantle
What feature occurs at X and how does it form?
X is an island arc formed by subduction
X is a trench formed by sea-floor spreading
X is a mid-ocean ridge formed by sea-floor spreading
X is a mid-ocean ridge formed by subduction
Which of the following was NOT a piece of evidence used by Wegener to support the idea of continental drift?
matching reptile fossils found in South America and Africa
matching plant fossils found on five different continents
a newly discovered force that he believed caused the continents to move
matching rock types and mountain belts on four different continents
What key piece of evidence was discovered that supported Harry Hess’ hypothesis of how continents move?
the discovery of magnetic reversal patterns in rocks on either side of mid-ocean ridges
the discovery of matching fossils on different continents
the discovery of a new force that keeps the continents from moving
the discovery of new unexplored mountain ranges
Most geologists rejected Alfred Wegener’s idea of continental drift because
they were afraid of a new idea
Wegener was interested in what Earth was like millions of years ago
Wegener used several different types of evidence to support his hypothesis
Wegener could not identify a force that could move the continents
Most geologists think that the movement of Earth’s plates is caused by
conduction
earthquakes
convection currents in the mantle
Earth's magnetic field
A collision between two pieces of continental crust at a converging boundary produces a
mid-ocean ridge
deep-ocean trench
rift valley
mountain ranges
Mid-ocean ridges are
found in all of Earth's oceans
found only in the Pacific ocean
located mostly along coastlines
long deep-ocean trenches
