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Ch 11, 8th Grade
Test Description: Magnetism and Electromagnetism
Instructions: Answer all questions to get your test result.
1) The ancient Greeks discovered a rock called ___ attracted materials containing iron.
A
kryptonite
B
magnesium
C
magnetite
D
magnetoniam
2) A north pole and a south pole would
A
attract
B
do nothing
C
repel
3) The relationship between electricity and magnetism is called
A
ferromagnetism
B
electrical energy
C
induced current
D
electromagnetism
4) A coil of wire with a current is called a ___
A
solenoid
B
electromagnet
C
primary coil
D
armature
5) Electrical energy is transformed into mechanical energy in a
A
motor
B
electromagnet
C
solenoid
D
transformer
6) A galvanometer is a device that measures
A
magnetism
B
electric current
7) A device that changes the voltage of alternating current is a
A
motor
B
generator
C
galvanometer
D
transformer
8) What happens when a magnet moves through a coil of wire?
A
the magnet loses magnetism
B
current is induced in the wire
C
electrical energy is transformed into mechanical energy
D
a current is induced in the magnet
9) The more loops a solenoid has,
A
the slower the current flows
B
the faster the current flows
C
the weaker its magnetic field
D
the stronger its magnetic field
10) What happens to the current in the armature of an electric motor when the commutator moves to a different brush?
A
it flows faster
B
it reverses direction
C
it stops flowing
D
it slows down
11) Who discovered that an electric current produces a magnetic field?
A
Albert Einstein
B
Hans Christian Oersted
C
Michael Faraday
D
Joseph Henry
12) Moving a wire coil upward in a magnetic field makes the needle of a galvanometer go left. What happens if we move the coil down?
A
the needle stays left
B
the needle goes right
C
the needle goes to 0
D
The needle goes farther left
13) An induced current will continue flowing after the movement of the magnet or coil stops.
A
false
B
true
14) Increasing the current in a solenoid of an electromagnet would
A
change the direction of the electromagnet
B
reduce the strength of the electromagnet
C
none of the above
D
increase the strength of the electromagnet
15) The north and south poles of a solenoid change with
A
the number of loops in the coil
B
the tightness of loops in the coil
C
the type of material in the core
D
the direction of the current
16) The energy an object has due to its movement or position is called
A
potential energy
B
excess energy
C
mechanical energy
D
static energy
17) Any material that exerts magnetic force is considered
A
iron
B
aluminum
C
magnetite
D
a magnet
18) A ___ is a device that has a magnetized needle that can spin freely
A
solenoid
B
transformer
C
electromagnet
D
compass
19) Magnetic field lines are closest together at
A
farther away from the magnet
B
the poles
C
none of the above.
D
the sides of the magnets
20) ___ is the angle between geographic north and the north to which a compass needle points.
A
magnetic declination
B
magnetic direction
C
magnetic anglination
D
magnetic resonation
*select an answer for all questions
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