North Carolina Science Grade 6

Chapter 18: Thermal Energy

Light

1.
A glass prism __________ light, producing the individual colors of visible light.
A)reflects
B)refracts
C)diffuses
D)diffracts
2.
If the handle of your aquarium net appears to be bent more when it is placed into a glass aquarium full of water than it does when the tank is empty, which of the following statements is true?
A)The index of refraction of water is greater than the index of refraction of air.
B)The angle of incidence of the water is greater than the angle of reflection of the glass.
C)The index of refraction of water is less than the index of refraction of glass.
D)The index of refraction of water is less than the index of refraction of air.
3.
The angle at which light strikes a surface is __________ the angle at which it is reflected.
A)less than
B)greater than
C)twice as great as
D)the same as
4.
Which of the following cells is most useful at night?
A)rod
B)red cone
C)blue cone
D)green cone
5.
__________ light is light of only one wavelength that travels with its crests and troughs aligned.
A)Compact
B)Incoherent
C)Coherent
D)Incandescent
6.
__________ materials only absorb and reflect light.
A)Translucent
B)Clear
C)Opaque
D)Transparent
7.
Which of the following colors of visible light has the longest wavelength?
A)blue
B)red
C)violet
D)yellow
8.
Why can't you see your reflection in a brick wall?
A)Light rays are reflected in only one direction from the rough surface.
B)Reflection of light from a rough surface is regular reflection.
C)Light rays are reflected in many directions from the uneven surface.
D)No light is reflected from a brick wall.
9.
What determines the color of an object?
A)the wavelength of light it absorbs
B)the wavelength of light it reflects
C)the index of diffraction of the object
D)the index of refraction of the object
10.
Which cone cells absorb yellow light?
A)blue
B)red and green
C)blue and yellow
D)red and yellow
11.
Which of the following types of cells is located in the retina?
A)cone
B)olfactory
C)conjunctiva
D)sclera
12.
If a transparent blue filter is placed over a camera lens, what happens to visible light entering it?
A)Blue light is absorbed by the filter, and the other colors of visible light enter the camera lens.
B)All colors of visible light pass through the filter and enter the camera lens.
C)Blue light is transmitted by the filter to the camera, and other colors of light are absorbed by the filter.
D)Blue light is reflected by the filter away from the camera, and the other colors of visible light enter the camera.
13.
Which of the following best describes an incandescent light?
A)uses the least amount of electricity to produce light
B)gives off light when tungsten filament is heated
C)contains argon gas at low pressure
D)gives off light when phosphors absorb ultraviolet radiation
14.
A __________ is a colored material that absorbs some colors and reflects others.
A)laser
B)filter
C)pigment
D)prism
15.
When visible light passes through a prism, why does red light bend the least?
A)Longer wavelengths are refracted less by a prism than shorter wavelengths.
B)Longer wavelengths cannot pass through a prism.
C)Longer wavelengths are refracted more by a prism than shorter wavelengths.
D)Shorter wavelengths cannot pass through a prism.
16.
The greater the difference in densities of air layers is, __________ .
A)the less the angle of incidence of light passing through them
B)the more the light passing through is refracted
C)the greater the angle of incidence of light passing through them
D)the less the light passing through is refracted
17.
Which of these types of material transmits almost all of the light that strikes it?
A)transparent
B)opaque
C)reflective
D)translucent
18.
Light waves vibrate in only one direction in __________ light.
A)polarized
B)reflected
C)refracted
D)diffused
19.
Optical fibers are __________ that can transmit light from one place to another.
A)coherent beams
B)filters acting as parallel slits
C)opaque glass fibers
D)transparent glass fibers
20.
The three primary colors of pigment appear __________ when they are mixed.
A)black
B)gray
C)white
D)brown
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