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Light and sound waves grade 8

Total questions: 60

Worksheet time: 1hrs 8mins

Name
Class
Date
1.
The point where the rays meet is known as....
a)
Fire
b)
the focal point
c)
refraction
d)
Plane of the lens
2.
Which describes a convex lens?
a)
triangular in shape
b)
more transparent in the middle
c)
thicker on the edges than in the middle
d)
thicker in the middle than on the edges
3.
A converging lens is also known as a ____ lens.
a)
convex
b)
concave
c)
double
d)
refracted
4.

What type of lens do you have in your eye?

a)

Concave

b)

Prismatic

c)

Objective

d)

Convex

5.
What part of the eye controls how much light enters the black hole (pupil) in the center of the eye?
a)
optic nerve
b)
pupil
c)
cornea
d)
iris
6.
The two parts of the eye that refract light are the ______________.
a)
eyelid and eyebrow
b)
eyelid and lens
c)
cornea and retina
d)
cornea and lens
7.

Which parts of the eye are used to focus the light on the retina?

a)

eyelid

b)

lens

c)

cornea

d)

retina

e)

iris

8.
For clear vision, an image must be focused exactly on the ________________.
a)
retina
b)
pupil
c)
optic nerve
d)
lens
9.

When light passes through a convex lens, it_________.

a)

Diverges, or spreads apart

b)

Converges, or comes together

c)

Reflects, or bounces off

d)

Creates a rainbow

10.

A myopic person might have trouble:

a)

reading small print

b)

seeing clearly in low light

c)

making out faraway objects

d)

seeing certain colors

11.

If your vision problems can be corrected by a convex lens, you:

a)

Having trouble seeing nearby objects

b)

Having trouble seeing faraway objects

c)

Having trouble telling whether objects are close up or far away

d)

Having blind spots at the edges of your vision

12.

Which of the following statements is true of nearsighted people?

a)

their retinas that are slightly misshapen

b)

they have trouble seeing nearby objects

c)

their vision problems can be corrected with convex lenses

d)

the lenses of their eyes focus light in front of their retinas

13.

Which kind of eye defect is this?

a)

short sighted

b)

long sighted

c)

normal sighted

14.

How do you correct for this kind of eye defect?

a)

use a convex lens

b)

use a concave lens

c)

no lens is needed

15.

Which kind of eye defect is this?

a)

short sighted

b)

far sighted

c)

normal sighted

16.

How is this type of eye defect corrected?

a)

using a convex lens

b)

using a concave lens

c)

normal sighted

17.

Sound is a form of energy. How is it produced?

a)

by waiting

b)

by vibrating objects

18.

It is the unit used for frequency.

a)

Hertz (Hz)

b)

decibel (dB)

19.

A _____ frequency sound has a higher pitch. A lower frequency sound has a _____ pitch.

a)

higher, higher

b)

lower, higher

c)

higher, lower

d)

lower, lower

20.

The human ear can only sense within the frequency range of _____.

a)

20 Hz to 20,000 Hz

b)

1,000 Hz to 100, 000 Hz

21.

It determines the s loudness or volume of a sound wave.

a)

frequency

b)

amplitude

22.

A high amplitude sound means _____ sound, and a low amplitude sound means _____ sound.

a)

softer, louder

b)

louder, softer

c)

louder, louder

d)

softer, softer

23.

The unit of intensity level for sound _____.

a)

Hertz (Hz)

b)

decibel (dB)

24.

A rarefaction is generated when particles move _______.

a)

together

b)

apart

c)

closer

d)

under

25.

In which of these types of media will sound travel fastest?

a)

solid

b)

liquid

c)

gas

d)

vacuum

26.

Frequency of waves is measured in __________.

a)

hertz

b)

decibels

c)

watts

d)

meters/second

27.

When sound hits a hard, flat solid the sound tends to ____________ resulting to an echo.

a)

Pass through

b)

Bounce back

c)

be absorbed

28.

Sound cannot travel without a medium to pass through.

a)

True

b)

False

c)

None of the above

29.
A disturbance that travels through a medium as a longitudinal wave
a)
sound
b)
wavelength
c)
pitch
d)
frequency
30.
The number of wavelengths that pass a point each second
a)
frequency
b)
wavelength
c)
pitch
d)
amplitude
31.
Material (matter) through which a wave travels
a)
medium
b)
Doppler Effect
c)
sound
d)
pitch
32.
What does pitch depend on?
a)
amplitude 
b)
frequency
c)
intensity 
d)
volume of sound
33.
If the distance represented by the letter A were increased, how would it change the way the sound was heard?
a)
The sound would be higher. 
b)
The sound would be lower. 
c)
The sound would be softer. 
d)
The sound would be louder. 
34.

Sound travels FASTEST through which of these materials?

a)

A type of gas, like helium

b)

Empty space

c)

A metal such as iron

d)

Water

35.

What is the wavelength of this wave?

a)

0.030 m

b)

0.040 m

c)

0.060 m

d)

0.080 m

36.

Pitch is related to (a)  

37.

Loudness (volume) is related to (a)   (this part of the wave).

38.
A reflected sound wave
a)
frequency
b)
pitch
c)
echo
d)
rarefaction
39.
A wave that requires a medium through which to travel
a)
mechanical wave
b)
chemical wave
c)
electromagnetic wave
d)
pitch
40.

The pitch of a sound depends on its:

a)

frequency

b)

amplitude

c)

intensity

d)

loudness

41.

The human ear can detect frequencies between:

a)

20 and 20000 Hz

b)

100 and 200 Hz

c)

1 and 100 Hz

d)

20 and 30 Hz

42.

Frequency is measured in:

a)

decibels

b)

Hertz

c)

meters

d)

seconds

43.

What does point C represent?

a)

Amplitude

b)

Trough

c)

Crest

d)

Wavelength

44.

What does point A represent?

a)

Amplitude

b)

Wavelength

c)

Crest

d)

Trough

45.

The _______ of a wave is how many waves pass a given point every second.

a)

Frequency

b)

Wavelength

c)

Amplitude

46.

Frequency is how many waves pass a point in 1 second. If 100 waves pass a given point in 4 seconds, what is the wave's frequency?

a)

25 Hz

b)

100 Hz

c)

4 Hz

d)

400 Hz

47.

In a longitudinal wave, a ____ is an area where the particles are spread apart and a ____ is an area where the particles are close together.

a)

crest, trough

b)

compression, rarefaction

c)

rarefaction, compression

d)

trough, crest

48.

In the diagram of a compressional wave, A is showing a ___ while B is showing a ___.

a)

compression, rarefaction

b)

trough, crest

c)

rarefaction, compression

d)

crest, trough

49.
Which wave in the diagram has the greatest frequency?
a)
1
b)
2
c)
3
d)
4
50.
Which wave in the diagram has the greatest wavelength?
a)
1
b)
2
c)
3
d)
4
51.
The highest point on a wave is:
a)
the crest
b)
the trough
c)
the top
d)
the coast 
52.
The lowest point on a wave is the:
a)
Amplitude
b)
Crest
c)
Trough
d)
Wavelength
53.
Which of the following can sound travel through?
a)
solid
b)
liquid
c)
gas
d)
all of the above
54.

The number of wave cycles in a unit of time is the ...

a)

Wave Speed

b)

Frequency

c)

Wavelength

d)

Amplitude

e)

Period

55.

What is the purpose of a wave?

a)

To confuse people.

b)

To transfer energy from one point to another.

c)

To transfer matter from one point to another.

d)

To alter the medium it travels through.

56.
What are the spaced out sections of this wave called?
a)
Reflections
b)
Rarefactions
c)
Compressions
d)
Wavelengths
57.
Which line represents the amplitude of the wave?
a)
A
b)
H
c)
From B to the resting point of the wave
d)
From E to G
58.
Which line represents the wavelength in the diagram?
a)
Between lines B and F
b)
D
c)
Between lines E and G
d)
A
59.

Which color has the lowest frequency?

a)

Red

b)

Pink

c)

Green

d)

Blue

60.

It determines the s loudness or volume of a sound wave.

a)

frequency

b)

amplitude

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