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Grade 8 Exercise Light

Total questions: 37

Worksheet time: 1hrs 5mins

Name
Class
Date
1.

What is organ that is used to see lights?

a)

Nose

b)

Lip

c)

Hair

d)

Eyes

2.

Object that emits its own light is called?

a)

Light ore

b)

Light source

3.

Below are example of light source except?

a)

Sun

b)

Lamp

c)

Fire

d)

Moon

4.

How does light travels?

a)

Light travels in a straight line

b)

Light travel in a circular line

5.

Object which is source of light is described as?

a)

Omnious Object

b)

Precious Object

c)

Luminous Object

d)

Treasures Object

6.

Why do we can see non-luminous object?

a)

Because they are source of light

b)

Because they produce their own light

c)

Because the reflect light

7.

Below are the example of non-luminous object except?

a)

Jupiter

b)

Saturnus

c)

Sun

d)

Golden egg

8.

Kind of material which light may pass through is called?

a)

Transmitter material

b)

Transparent material

c)

Transverse material

9.

The material which light might be absorbed is called?

a)

Optic material

b)

Opaque material

c)

Optical material

10.

When an opaque object block the light what will be formed?

a)

Image

b)

Luminous object

c)

Shadow

11.

Below which one opaque object?

a)

Glass

b)

White board

c)

Water

12.

What is the picture you see in a mirror?

a)

Image

b)

Virtual

c)

Shadow

13.

Why do we see a clear image in a mirror?

a)

Because mirror is transparent object

b)

Because mirror is made from glass

c)

Because mirror has smooth surface

14.

What is the law of reflection?

a)

angle of incidence = angle of reflection

b)

angle of incidence > angle of reflection

c)

angle of incidence < angle of reflection

15.

A ray of light come with angle of incidence is 30o. Calculate the angle of reflection!

a)

25o

b)

30o

c)

45o

d)

60o

16.

What is the angle of normal line to the surface?

a)

30o

b)

45o

c)

60o

d)

90o

17.

The bend of light when it enter different material is called?

a)

Reflection

b)

Refraction

c)

Rarefaction

d)

Restoration

18.

what phenomenon is this picture represent?

a)

Reflection

b)

Refraction

c)

Dispersion

d)

Rarefaction

19.

In what kind of object does refraction can happens?

a)

Opaque object

b)

Smooth shiny object

c)

Transparent object

20.

Light come from air and enter water with angle of incidence of 30o. What would be the angle of refraction?

a)

21o

b)

32o

c)

43o

d)

52o

21.

Light come leaves water toward air with incident angle of 30o. What will be the angle of refraction?

a)

41o

b)

15o

c)

29o

22.

Why the swimming pool looks shallower then its real depth?

a)

Because lights from water bend away from normal line

b)

Because lights from water bend toward normal line

23.

The splitting of white light into spectrum of color is called?

a)

Reflection

b)

Diffraction

c)

Dispersion

d)

Interference

24.

What this phenomenon is called?

a)

Difraction

b)

Dispersion

c)

Disconnection

25.

What is the example of dispersion?

a)

Pencil looks bend

b)

Rainbow

c)

Image in mirror

26.

In color spectrum, which color is bent the most by prism?

a)

Red

b)

Yellow

c)

Green

d)

Violet

27.

In color spectrum which one is bent least?

a)

Red

b)

Yellow

c)

Green

d)

Violet

28.

What is this phenomenon is called?

a)

Diffraction

b)

Reflection

c)

Refraction

d)

Dispersion

29.

What is this phenomenon is called?

a)

Reflection

b)

Diffraction

c)

Dispersion

d)

Refraction

30.

Region when no light falls is called?

a)

Image

b)

Opaque

c)

Shadow

31.

If white light enters red filter which color will pass through?

a)

Blue

b)

Violet

c)

Green

d)

Red

32.

Below are three primary color of light except?

a)

Red

b)

Green

c)

Blue

d)

Yellow

33.

To create white light which color has to be combine?

a)

Red+Green+Blue

b)

Red+Yellow+Blue

c)

Blue+Yellow+Green

34.

When we see red car, which color is absorbed by the car?

a)

Red

b)

All except Red

35.

When we see red car, which color is Reflected by the car?

a)

Red

b)

Blue

36.

Which color lies between yellow and blue in spectrum of light?

a)

Green

b)

Red

c)

Indigo

37.

Red light + Blue Light =

a)

Green

b)

Violet

c)

Yellow