Middle School Final Exam Review 2 Question Preview (ID: 42644)
Final Exam Review 2.
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People tint windows dark to encourage _____.
a) transmission of light
b) absorption of light
c) reflection of light
d) transfusion of light
Light travels fastest in _____.
a) empty space
b) fresh water
c) solids
d) seawater
Which of the following media can sound NOT travel through?
a) air
b) empty space
c) metal
d) water
Which part of the ear is responsible for amplifying sound?
a) inner ear
b) middle ear
c) outer ear
d)
In which of the following places would you most likely hear echoes?
a) in a forest
b) in a gymnasium
c) in a recording studio
d) in an airplane
A particle of electromagnetic radiation is called a _____.
a) proton
b) nucleus
c) photon
d)
The electromagnetic spectrum is the entire range of electromagnetic waves with different _____ and _____.
a) frequencies, amplitudes
b) amplitudes, wavelength
c) frequencies, wavelengths
d) wavelengths, energies
When an electric field is strongest in one direction, the magnetic field is strongest in which direction?
a) parallel to the direction of the electric field
b) in the opposite direction of the electric field
c) perpendicular to the direction of the electric field
d) in a circular direction around the electric field
Normally, atoms are electrically neutral because there are ____.
a) more protons than electrons
b) more electrons than protons
c) equal numbers of protons and neutrons
d) equal numbers of protons and electrons
A circuit that has two or more separate paths for electrons to follow is a(n)____.
a) parallel
b) series
c)
d)
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.
c)
d)
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.
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 heat it while it is being influenced by a magnetic field.
c) You can put it in a very strong magnetic field.
d) You can do any of the above.
Which of the following describes both an electromagnet and a permanent magnet?
a) The poles can be reversed.
b) The strength of the magnetic force can be controlled.
c) The magnetic force can be turned off and on.
d) It has a north pole and a south pole.
An electric generator can produce current that changes direction in a regular pattern. This is called which of the following?
a) alternative current
b) direct current
c) patterned current
d) alternating current
The location of the strongest magnetic field is the ____.
a) center of the magnet
b) magnetic poles
c)
d)
Which statement is true?
a) In a step-up transformer, the secondary coil has the same number of coils as the primary coil
b) In a step-up transformer, the secondary coil has fewer loops than the primary coil.
c) In a step-down transformer, the secondary coil has more loops than the primary coil.
d) In a step-up transformer, the secondary coil has more loops than the primary coil.
Current that does NOT reverse direction is called ____.
a) direct current
b) alternating current
c)
d)
The region around a magnet where the magnetic forces act is the ____.
a) electromagnetic pole
b) magnetic domain
c) magnetic field
d) magnetic pole
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
c)
d)
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