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Middle School Final Exam Review 2
Test Description: Final Exam Review 2
Instructions: Answer all questions to get your test result.
1) People tint windows dark to encourage _____.
A
reflection of light
B
transmission of light
C
transfusion of light
D
absorption of light
2) Light travels fastest in _____.
A
fresh water
B
solids
C
empty space
D
seawater
3) Which of the following media can sound NOT travel through?
A
empty space
B
metal
C
water
D
air
4) Which part of the ear is responsible for amplifying sound?
A
inner ear
B
middle ear
C
outer ear
5) In which of the following places would you most likely hear echoes?
A
in an airplane
B
in a recording studio
C
in a forest
D
in a gymnasium
6) A particle of electromagnetic radiation is called a _____.
A
proton
B
photon
C
nucleus
7) The electromagnetic spectrum is the entire range of electromagnetic waves with different _____ and _____.
A
wavelengths, energies
B
frequencies, amplitudes
C
amplitudes, wavelength
D
frequencies, wavelengths
8) When an electric field is strongest in one direction, the magnetic field is strongest in which direction?
A
perpendicular to the direction of the electric field
B
in the opposite direction of the electric field
C
parallel to the direction of the electric field
D
in a circular direction around the electric field
9) Normally, atoms are electrically neutral because there are ____.
A
equal numbers of protons and electrons
B
more electrons than protons
C
equal numbers of protons and neutrons
D
more protons than electrons
10) A circuit that has two or more separate paths for electrons to follow is a(n)____.
A
series
B
parallel
11) Which of the following statements about the forces between charged objects is not true?
A
If one object is positively charged and another is negatively charged, the objects will attract each other.
B
As the distance between charged objects decreases, the electric force between them decreases
12) As a nail approaches the south pole of a magnet, what happens to its magnetic domains? (Hint:opposites attract)
A
The north poles of the domains point toward the magnet.
B
The south poles of the domains point toward the magnet.
C
The domains spin, but end up in no particular pattern.
D
The domains split up and the atoms of the nail look more like the atoms of plastic.
13) How can you make an item that is made of magnetic material become a permanent magnet instead of a temporary magnet?
A
You can heat it while it is being influenced by a magnetic field.
B
You can leave it in the magnetic field of an actual magnet for a long time.
C
You can put it in a very strong magnetic field.
D
You can do any of the above.
14) Which of the following describes both an electromagnet and a permanent magnet?
A
The magnetic force can be turned off and on.
B
It has a north pole and a south pole.
C
The poles can be reversed.
D
The strength of the magnetic force can be controlled.
15) An electric generator can produce current that changes direction in a regular pattern. This is called which of the following?
A
direct current
B
alternative current
C
patterned current
D
alternating current
16) The location of the strongest magnetic field is the ____.
A
magnetic poles
B
center of the magnet
17) Which statement is true?
A
In a step-down transformer, the secondary coil has more loops than the primary coil.
B
In a step-up transformer, the secondary coil has the same number of coils as the primary coil
C
In a step-up transformer, the secondary coil has more loops than the primary coil.
D
In a step-up transformer, the secondary coil has fewer loops than the primary coil.
18) Current that does NOT reverse direction is called ____.
A
direct current
B
alternating current
19) The region around a magnet where the magnetic forces act is the ____.
A
electromagnetic pole
B
magnetic domain
C
magnetic field
D
magnetic pole
20) When a power plant sends out high voltage electricity for long distance transmission, what is needed to make the electricity usable in houses?
A
a step-down transformer
B
a step-up transformer
*select an answer for all questions
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