AnswersAG Q3 Physical Science 25-26 JComunaleUnit Test

Unit Test — Unit test Answers

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1
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Prisms separate ________ light, such as that from the Sun, by wavelength.Which best completes the statement?

A
ultraviolet
B
white
C
infrared
D
black
2
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Which best describes what happens when light traveling through air enters water at an angle?

A
It moves along straight lines in air and changes direction when it enters water.
B
It moves in a curve in air and moves in straight lines when it enters water.
C
It moves along straight lines in air and continues along the same lines when it enters water.
D
It moves in a curve in air and continues moving in the same curve when it enters water.
3

The diagram shows the reflection of light from a mirror.

Question illustration
A
40°
B
50°
C
90°
D
180°
4

Where do the three rays in a ray diagram start?

A
at a focal point on the opposite side of the lens
B
at three different points on the object
C
at a focal point on the same side of the lens
D
at a single point on the object
5

When light bends as it passes from one transparent object to another, the light is ________.Which best completes the statement?

A
absorbed
B
reflected
C
refracted
D
bounced
6

How does a convex mirror form an image?

A
It bends the light toward a focal point.
B
It bends the light away from a focal point.
C
It bounces the light toward a focal point.
D
It bounces the light away from a focal point.
7

Which part of the electromagnetic spectrum has the longest wavelengths?

A
radio waves
B
gamma rays
C
infrared light
D
ultraviolet light
8

A clothing manufacturer uses lasers to cut patterns in fabric when making T-shirts.

A
Laser machinery does not require energy.
B
Laser machinery is safer because its light is weak.
C
Lasers save time by cutting through more layers of fabric.
D
Lasers result in fewer injuries because they quickly become blunt.
9

Which part of the electromagnetic spectrum is necessary for the sense of sight in humans?

A
radio waves
B
gamma rays
C
infrared light
D
visible light
10

An endoscope is a fiber-optic medical instrument that emits light. Doctors can insert endoscopes into hollow body parts. Which property of fiber-optic strands makes them most useful in endoscopes?

A
They can create virtual images.
B
They are decorative and colorful.
C
They can transmit data quickly.
D
They are small and flexible.
11

When all else remains the same, what effect would decreasing the focal length have on a convex lens?

A
It would cause the lens to produce only real images.
B
It would cause the lens to produce only virtual images.
C
It would make the lens stronger.
D
It would make the lens weaker.
12

A museum sets up a display of fluorescent minerals. Which best describes how electromagnetic waves can be used to enhance the display?

A
Infrared light shining on the minerals will cause them to give off visible light.
B
Visible light shining on the minerals will cause them to give off infrared light.
C
Ultraviolet light shining on the minerals will cause them to give off visible light.
D
Visible light shining on the minerals will cause them to give off ultraviolet light.
13

After the 1600s, how did observations of light being refracted change the way most scientists thought about light?

A
They no longer believed that light acted as waves.
B
They began to believe that light acted as waves.
C
They no longer believed that light acted as particles.
D
They began to believe that light acted as particles.
14

Which kinds of lenses are in a light microscope?

A
a concave objective lens and a convex eyepiece lens
B
a convex objective lens and a concave eyepiece lens
C
concave objective and eyepiece lenses
D
convex objective and eyepiece lenses
15

Franny drew a diagram to compare images produced by concave and convex lenses.Which belongs in the area marked X?

Question illustration
A
Real
B
Virtual
C
Larger than object
D
Upside down
16

Which best describes a difference between laser light and regular light?

A
Laser light is less concentrated.
B
Laser light has a beam that spreads out.
C
Laser light is made of one specific color.
D
Laser light pumps out light particles one at a time.
17

If humans cannot see ultraviolet waves, how can ultraviolet light be used to gather evidence of a crime?

A
Ultraviolet light detects the presence of radioactive substances.
B
Ultraviolet light shows cold areas as blue and warm areas as red.
C
Ultraviolet light causes substances to fluoresce and give off visible light.
D
Ultraviolet light transmits information to AM and FM radio receivers.
18

How is an image formed by a plane mirror?

A
Light bounces off of the mirror and then appears to come from in front of the mirror.
B
Light passes through the mirror and then appears to come from behind the mirror.
C
Light passes through the mirror and then appears to come from in front of the mirror.
D
Light bounces off of the mirror and then appears to come from behind the mirror.
19

Which describes an image that a concave mirror can make?

A
The image is always virtual.
B
The image can be either virtual or real.
C
The image is never upside down.
D
The image can only be the same size as the object.
20

Green plants need light in order to survive. Structures in the leaves absorb light, which in turn, helps plants make their own food.Under which color of light will plants be least likely to make food?

A
red
B
blue
C
orange
D
green

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