Science 6 Chapter 11 Test Set A Question Preview (ID: 37368)
Electricity And Magnetism.
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Magnetic field lines around a bar magnet
a) are only perpendicular to the magnet
b) spread out from one pole and curve around to the other
c) cross back and forth over one another
d) are perfectly straight
Every magnet, regardless of its shape, has two
a) magnetic poles
b) magnetic charges
c) magnetic fields
d) magnetic needles
Magnetic poles that are unlike
a) attract each other
b) repel each other
c) do not interact
d) point in the same direction
What is one difference between a galvanometer and an electric motor?
a) An electric motor causes something to move.
b) A galvanometer uses electric current.
c) In an electric motor, the armature spins continuously.
d) An electric motor uses electrical energy.
To reverse the direction of a current in a motor, current is conducted
a) through the armature
b) in the direction of rotation
c) through the brushes to the commutator
d) through the commutator to the armature
The type of current produced by a battery is
a) direct current
b) alternating current
c) magnetic current
d) induced current
You can increase the strength of an electromagnet's field by
a) decreasing the current in the solenoid
b) decreasing the number of loops in the solenoid
c) using a stronger ferromagnetic material for the core
d) winding the coils more loosely
As Earth's magnetic poles move, the magnetic declination in a given location will
a) stay the same
b) switch to point south
c) change
d) return to zero
An electric current produces a(n)
a) magnetic field
b) magnet
c) solenoid
d) insulator
Electric current from a generating plant is
a) direct current transmitted at high voltages, but usually used at low voltages.
b) alternating current transmitted at high voltages, but usually used at low voltages.
c) alternating current transmitted at low voltages, but usually used at high voltages.
d) direct current transmitted at low voltages, but usually used at high voltages.
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