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Electromagnetism
Test Description: 8th
Instructions: Answer all questions to get your test result.
1) A magnetic force is a noncontact force
A
true
B
false
2) The less perpendicular a magnet is to a wire,
A
the stronger the current will be
B
the weaker the current will be
3) In an electric motor, a type of electrical switch that reverses the current in the coil
A
alternator
B
commutator
C
starter
D
magnet
4) The more loops in the wire of an electromagnet,
A
the stronger the electromagnet will be
B
will not affect the strength of the electromagnet
C
the weaker the electromagnet will be
5) The magnetic field of a wire is ___ to the current.
A
the same direction as
B
nonexistent
C
parallel
D
perpendicular
6) Electric wires are usually made of ___ because it is one of the best conductors
A
nickel
B
rubber
C
silver
D
copper
7) When a circuit is complete and electric energy flows through it, it is called a(n)
A
closed circuit
B
successful circuit
C
complete circuit
D
open circuit
8) When objects with unequal charges touch, charged particles flow from the object with the ___ concentration of negative charge to the area with a ___ concentration.
A
greater, lower
B
similar, like
C
negative, negative
D
lower, greater
9) The more distance between two unlike electrical charges,
A
the more potential energy there is between them
B
the less potential energy there is between them.
10) A nail is touching a magnet. The nail starts picking up paper clips. When the magnet is removed from the nail, the paper clips fall. The nail is an example of a(n)
A
charged magnet
B
static magnet
C
permanent magnet
D
temporary magnet
11) All magnetic materials are magnets
A
false
B
true
12) Each atom has its own magnetic field.
A
true
B
false
13) Earth's magnetic field...
A
does nothing beneficial to Earth
B
protects it from cosmic rays and charged particles from the Sun
C
makes the sky blue
D
creates gravity
14) Magnets are strongest
A
at the poles
B
everywhere equally
C
perpendicular to it
D
in the middle
15) Opposite magnetic poles
A
attract
B
repel
C
do nothing
16) A material in which charged particles can easily move
A
electrical insulator
B
electrical convector
C
electrical conductor
D
electrical charger
17) When a battery is hooked up in a circuit, the charges travel from the
A
positive side to the negative side
B
negative side to the positive side
18) An electric motor has all things except a
A
permanent magnet
B
switch
C
source of energy
D
rotating coil of wire
19) We can create a current by moving an electric wire through a magnetic field
A
true
B
false
20) Permanent magnets can become unmagnetized.
A
true
B
false
*select an answer for all questions
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