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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
magnetite
B
magnetoniam
C
kryptonite
D
magnesium
2) A north pole and a south pole would
A
do nothing
B
repel
C
attract
3) The relationship between electricity and magnetism is called
A
electromagnetism
B
ferromagnetism
C
electrical energy
D
induced current
4) A coil of wire with a current is called a ___
A
primary coil
B
solenoid
C
electromagnet
D
armature
5) Electrical energy is transformed into mechanical energy in a
A
transformer
B
solenoid
C
electromagnet
D
motor
6) A galvanometer is a device that measures
A
electric current
B
magnetism
7) A device that changes the voltage of alternating current is a
A
galvanometer
B
transformer
C
motor
D
generator
8) What happens when a magnet moves through a coil of wire?
A
the magnet loses magnetism
B
electrical energy is transformed into mechanical energy
C
current is induced in the wire
D
a current is induced in the magnet
9) The more loops a solenoid has,
A
the faster the current flows
B
the slower the current flows
C
the stronger its magnetic field
D
the weaker 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 reverses direction
B
it flows faster
C
it slows down
D
it stops flowing
11) Who discovered that an electric current produces a magnetic field?
A
Albert Einstein
B
Hans Christian Oersted
C
Joseph Henry
D
Michael Faraday
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 goes to 0
B
The needle goes farther left
C
the needle stays left
D
the needle goes right
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
reduce the strength of the electromagnet
B
increase the strength of the electromagnet
C
none of the above
D
change the direction of the electromagnet
15) The north and south poles of a solenoid change with
A
the type of material in the core
B
the direction of the current
C
the tightness of loops in the coil
D
the number of loops in the coil
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
electromagnet
B
compass
C
transformer
D
solenoid
19) Magnetic field lines are closest together at
A
none of the above.
B
the poles
C
farther away from the magnet
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 resonation
C
magnetic anglination
D
magnetic direction
*select an answer for all questions
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