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Light

Total questions: 60

Worksheet time: 1hrs 22mins

Name
Class
Date
1.

Sami is 50 cm from a vertical mirror. He moves 20cm away. The distance between his image and himself is then ………….

a)

100cm

b)

120cm

c)

140cm

d)

40cm

2.

The imaginary line perpendicular to the mirror is called the:

a)

Incident ray

b)

reflected ray

c)

normal line

3.

The angle between the reflected ray and the normal line is called the:

a)

Angle of incidence

b)

Angle of reflection

c)

angle of convergent

d)

Angle of divergent.

4.

If the angle of incidence is 45 degree, what is the angle of reflection?

a)

90°

b)

45°

c)

180°

5.

The Law of reflection states that - The angle of incidence is .................. the angle of reflection.

a)

equal to

b)

double

c)

half

6.

The ray of light that strikes a mirror is called ________.

a)

an incident ray

b)

a reflected ray

c)

a normal ray

d)

none of the above

7.
Light travels in ___________ lines
a)
wavy
b)
bent
c)
straight
d)
backwards
8.

Which of the following is not a source of light?

a)

A. candle

b)

B. caver’s lamp

c)

C. mirror

d)

D. sun

9.

What is reflection?

a)

Reflection is the bouncing of light off the surface that it strikes on.

b)

Reflection is the absorbing of light off the surface that it strikes on.

c)

Reflection is the bending of light off the surface that it strikes on.

d)

Reflection is the transmission of light off the surface that it strikes on.

10.
Why can you see most objects? 
a)
they emit light
b)
light refracts through them
c)
light reflects off them
d)
They absorb light
11.

The angle between the reflected ray and the normal line is called the:

a)

angle of incidence

b)

angle of reflection

c)

angle of convergent

d)

angle of divergent

12.

Straight lines with arrows that represent light waves:

a)

rays

b)

image

c)

reflection

d)

visible light

13.

A copy of an object formed by reflected or refracted rays of light

a)

image

b)

reflection

c)

regular reflection

d)

diffuse reflection

14.

What is A?

a)

Angle of incidence

b)

Angle of reflection

c)

Incident ray

d)

Reflected ray

e)

Normal line

15.

We can see images in _________ surfaces

a)

smooth

b)

rough

c)

shiny

d)

bumpy

16.

A ray of light is incident on a plane mirror and the angle of incidence is 25 degrees. What is the angle of reflection?

a)

0 degrees

b)

50 degrees

c)

90 degrees

d)

25 degrees

17.

Which color shirt would keep you cooler on a hot day?

a)

black

b)

white

c)

gray

d)

navy blue

18.

The bending of light is called:

a)

refraction

b)

light

c)

opaque

d)

reflection

19.

A _________ forms when the path of light is blocked.

a)

sun

b)

circle

c)

line

d)

shadow

20.

Materials that do not allow light to pass through are called:

a)

clear

b)

opaque

c)

transparent

d)

translucent

21.
The bouncing of light off an object
a)
basketball
b)
refraction
c)
reflection
d)
echo
22.

The change in the ________ of light causes it to bend

a)

speed

b)

distance

c)

length

d)

color

23.

Materials that let some of the light pass through are called:

a)

transparent

b)

opaque

c)

clear

d)

translucent

24.
Plastic wrap is
a)
dark
b)
opaque
c)
translucent
d)
transparent
25.
The following is a picture of what type of mirror? 
a)
Convex Mirror
b)
Concave Mirror
c)
Plane Mirror
d)
Flat Mirror
26.
The following is a picture of what type of mirror? 
a)
Convex Mirror
b)
Concave Mirror
c)
Plane Mirror
d)
Flat Mirror
27.
An image that you can see , but does not really exist is called which of the following?
a)
Real Image
b)
Fake Image
c)
Virtual Image
d)
Digital Image
28.
The Law of Reflection:
The angle of incidence is _________ the angle of reflection
a)
bigger than
b)
the same as
c)
smaller than
29.

How does light behave as it enters these mediums?

a)

continue its path as straight line.

b)

bends toward the normal

c)

bends away from the normal

d)

reflects

30.
A student placed a pencil in a cup of water.  The pencil appears broken because light-
a)
always travels in a straight line
b)
bends when it passes through water
c)
makes the water in the glass evaporate
d)
reflects the pencil on the water's surface
31.
Light travels at a speed of 300,000 km/s in outer space but can slow in different materials like glass or water.
a)
True
b)
False
32.
Refraction is when light__________.
a)
Is bounced by an object or material.
b)
Changes speed as it travels in different materials which causes bending.
c)
When light speeds up to over 300,000 km/s
33.

A beam of light travels from one material into another material. The light can travel faster in the second material, so:

a)

it is bent toward the normal.

b)

it is unaffected.

c)

it always lies along the normal.

d)

it is bent away from the normal.

34.
 In what medium does light travel the slowest?
a)
glass
b)
air 
c)
water
d)
vacuum
35.
The bending of a wave as it passes at an angle from one medium to another is called?
a)
Convex Lens
b)
Refraction
c)
Concave Lens
36.
The illustration shows a light ray striking an object.
In the illustration, the light ray striking the object is-
a)
absorbed
b)
stopped
c)
reflected
d)
refracted
37.
If the angle of incidence increases, the angle of refraction ________.
a)
Increases
b)
Decreases
38.
Refraction is when light ____________ a medium.
a)
bends through
b)
bends around
c)
bounces off
d)
is absorbed by
39.

Which of the following in the diagram is the refracted ray?

a)
A
b)
B
c)
C
d)
D
40.

Light energy is absorbed by a substance, and then light is slowly released by the substance (example: glow in the dark toys).

a)

bioluminescence

b)

fluorescence

c)

phosphorescence

d)

chemiluminescence

e)

incandescence

41.

UV light is produced by passing electricity through mercury gas, phosphor coating absorbs the UV and gives off light we can see:

a)

bioluminescence

b)

fluorescence

c)

phosphorescence

d)

chemiluminescence

e)

incandescence

42.

Light is produced when 2 or more chemicals combine.

a)

bioluminescence

b)

fluorescence

c)

phosphorescence

d)

chemiluminescence

e)

incandescence

43.

Light is produced by living organisms.

a)

bioluminescence

b)

fluorescence

c)

phosphorescence

d)

chemiluminescence

e)

incandescence

44.

Reason (s) why organisms use bioluminescence. Check all that apply.

a)

to avoid predators

b)

to find a mate

c)

to find food

45.
You have cool glow-in-the-dark stickers of Mickey Mouse. This is an example of 
a)
fluorescence
b)
chemiluminescence
c)
phosphorescence 
d)
incandescence
46.
You can see through water because ---
a)
it's opaque
b)
it's translucent 
c)
it's transparent
d)
it's wet
47.
Luminous means...
a)
Gives out its own light
b)
Reflects light from other things
48.
What is an example of artificial light?
a)
the sun 
b)
the stars 
c)
bioluminescence 
d)
neon light 
49.
All of the following are sources of light except ______________
a)
the sun
b)
a light bulb
c)
fire
d)
the moon
50.
A material that reflects or absorbs all of the light that strikes it is called which of the following? 
a)
Transparent
b)
Translucent
c)
Diffuse
d)
Opaque
51.

The picture here is an example of...

a)

incandescence

b)

chemiluminescence

c)

bioluminescence

d)

fluorescence

52.
Light is a form of 
a)
energy
b)
radiation
c)
reflection
53.
Light travels
a)
around corners
b)
in a straight line
54.

Glo-Sticks are an example of a __________ light source.

a)

chemiluminescence

b)

bioluminescence

c)

fluorescence

d)

incandescence

55.

The picture shows an example of a ________________ light source.

a)

chemiluminescence

b)

fluorescence

c)

incandescence

d)

bioluminescence

e)

phosphorescence

56.

What is B?

a)

Angle of incidence

b)

Angle of reflection

c)

Incident ray

d)

Reflected ray

e)

Normal line

57.

What is C?

a)

Angle of incidence

b)

Angle of reflection

c)

Incident ray

d)

Reflected ray

e)

Normal line

58.

What is D?

a)

Angle of incidence

b)

Angle of reflection

c)

Incident ray

d)

Reflected ray

e)

Normal line

59.

What is E?

a)

Angle of incidence

b)

Angle of reflection

c)

Incident ray

d)

Reflected ray

e)

Normal line

60.

Light is produced by heating a material until it glows.

a)

bioluminescence

b)

fluorescence

c)

phosphorescence

d)

chemiluminescence

e)

incandescence

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