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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
absorption of light
C
transmission of light
D
transfusion of light
2) Light travels fastest in _____.
A
solids
B
fresh water
C
seawater
D
empty space
3) Which of the following media can sound NOT travel through?
A
empty space
B
metal
C
air
D
water
4) Which part of the ear is responsible for amplifying sound?
A
inner ear
B
outer ear
C
middle ear
5) In which of the following places would you most likely hear echoes?
A
in a recording studio
B
in a gymnasium
C
in an airplane
D
in a forest
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
amplitudes, wavelength
C
frequencies, wavelengths
D
frequencies, amplitudes
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 a circular direction around the electric field
C
in the opposite direction of the electric field
D
parallel to the direction of the electric field
9) Normally, atoms are electrically neutral because there are ____.
A
more electrons than protons
B
equal numbers of protons and neutrons
C
equal numbers of protons and electrons
D
more protons than electrons
10) A circuit that has two or more separate paths for electrons to follow is a(n)____.
A
parallel
B
series
11) Which of the following statements about the forces between charged objects is not true?
A
As the distance between charged objects decreases, the electric force between them decreases
B
If one object is positively charged and another is negatively charged, the objects will attract each other.
12) As a nail approaches the south pole of a magnet, what happens to its magnetic domains? (Hint:opposites attract)
A
The domains split up and the atoms of the nail look more like the atoms of plastic.
B
The domains spin, but end up in no particular pattern.
C
The south poles of the domains point toward the magnet.
D
The north poles of the domains point toward the magnet.
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 leave it in the magnetic field of an actual magnet for a long time.
B
You can do any of the above.
C
You can put it in a very strong magnetic field.
D
You can heat it while it is being influenced by a magnetic field.
14) Which of the following describes both an electromagnet and a permanent magnet?
A
The strength of the magnetic force can be controlled.
B
It has a north pole and a south pole.
C
The magnetic force can be turned off and on.
D
The poles can be reversed.
15) An electric generator can produce current that changes direction in a regular pattern. This is called which of the following?
A
alternating current
B
alternative current
C
patterned current
D
direct current
16) The location of the strongest magnetic field is the ____.
A
center of the magnet
B
magnetic poles
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
magnetic domain
B
electromagnetic pole
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-up transformer
B
a step-down transformer
*select an answer for all questions
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