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Light

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

The splitting of white light into its seven constituent colours is called

a)

refraction

b)

dispersion

c)

deviation

d)

reflection

2.

Sneha was curious about the different parts of the human eye and learned that the iris is the coloured part of the eye.

a)

true

b)

false

3.

What makes objects visible ?

a)

the absorption of light by objects

b)

the reflected light from the object

c)

the total internal reflection taking place in an object

4.

If the angle of incidence of light falling on a plane mirror is 30°, what will be the angle of reflection?

a)

60°

b)

30°

c)

55°

d)

40°

5.

When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called

a)

mirage

b)

Up -side down phenomenon

c)

Left-right confusion

d)

Lateral inversion

6.

If you are standing 2m away from a plane mirror the distance between you and your image are

a)

2m

b)

4m

c)

6m

d)

8m

7.

the lens focuses light on the back of the eye, on a layer called

a)

retina

b)

optic nerves

c)

pupil

d)

iris

8.

The impression of an image does not vanish immediately from the retina.It persits there for about ___________ of a second.

a)

1/16 th

b)

1/5 th

c)

1

d)

6

9.

Diffused / irregular reflection takes place from

a)

rough surface

b)

smooth surface

10.

When light hits an area and bounces back it is called:

a)

echo

b)

refraction

c)

reflection

d)

absorbing

11.

Light travels through air, water, glass and many other materials. What path does it travel to get from one place to another?

a)

sideways

b)

back and forth

c)

straight

d)

up and down

12.

Asher is playing outside on a sunny day. He notices that when the sunlight hits a large tree, a dark area appears on the ground. What is usually created when light hits a barrier that is solid/opaque like the tree?

a)

a hot object

b)

a shadow

c)

nothing

13.

What is the best explanation for Mickey seeing himself in the mirror?

a)

refraction

b)

absorbed

c)

reflection

d)

flipped

14.

In the diagram, which letter represents the angle of incidence?

a)

A

b)

B

c)

C

d)

D

15.
........... – the angle between the normal and the incident ray.
a)
Angle of incidence
b)
Angle of reflection
c)
Angle of coincidence
d)
Angle of direction
16.
The ray of light that strikes a reflecting surface is called ________.
a)
incident ray
b)
reflected ray
c)
normal ray
d)
none of the above
17.
The imaginary line perpendicular to a reflecting surface is called _____.
a)
crooked line
b)
parallel line
c)
angular line
d)
normal line
18.

The comfortable distance at which a person can read is about ______

a)

35m

b)

35cm

c)

25cm

d)

25m

19.

Lack of __________ in foodstuff is responsible for many eye troubles

a)

Vitamin B complex

b)

Vitamin D

c)

Vitamin C

d)

Vitamin A

20.

__________ are used in submarines, tanks and also by soldiers in bunkers to see things outside

a)

Periscope

b)

Kaleidoscope

c)

Multiple images

d)

Dispersion

21.

_________ controls the amount of light entering into the eye

a)

Cornea

b)

Pupil

c)

Iris

d)

Retina

22.

Sensations felt by the nerve cells are transmitted to the brain through the _______

a)

Optic nerve

b)

Blind spot

c)

Nerve cell

d)

Rods

23.

As Avni noticed that her grandmother's eyesight became foggy, she learned that when this happens, a person is said to have __________

a)

Myopia

b)

Cataract

c)

Hypermetropia

d)

Short sight

24.

_______ present in the retina sense the colours

a)

Rods

b)

Cones

c)

Both a and b

d)

Optic nerve

25.

Example of a translucent object is

a)

tissue paper

b)

rubber

c)

board

d)

door

26.

The following is an example of

a)

refraction

b)

reflection

c)

dispersion

d)

polarization

27.

The black part of eye that allows light inside eye is?

a)

Cornea

b)

Iris

c)

Pupil

d)

Retina

28.

When you enter a dark room, your pupil will?

a)

Decrease in size

b)

Increase in size

c)

No change

d)

Turns white

29.

Retina consists of

a)

Rods only

b)

Cones only

c)

Iris and Pupil

d)

Rods and Cones

30.

Can we create multiple images using only two mirrors

a)

Yes

b)

No

31.

How many images are formed, if the angle is 10?

a)

26

b)

35

c)

10

d)

infinity

32.

Two mirrors can produce infinite images when _______ between them

a)

angle is 90

b)

angle is 180

c)

angle is 360

d)

angle is 0

33.

Formula to find mirror images is?

a)

360/Angle

b)

360/Angle - 1

c)

Angle/360

d)

Angle/360 - 1

34.

If the pupil is enlarged, it means?

a)

Person is in a dark room

b)

Person is in open sunlight

c)

Person is in normal lighting

d)

Person is blind

35.

It is a bundle of nerves beginning from the brain and entering the eyeball from behind.

a)

Sclera

b)

Iris

c)

Optic nerve

d)

Ciliary muscles

36.

The size of the pupil of the eye is adjusted by

a)

cornea

b)

ciliary muscle

c)

optic nerve

d)

iris

37.

A device which works on the reflection of light from two plane mirrors arranged parallel to one another is

a)

Electroscope

b)

kaliedoscope

c)

Periscope

d)

Stethoscope

38.

As the angle between two plane mirrors is decreases gradually, the number of images of an object placed between them

a)

increases gradually

b)

Decreases gradually

c)

First increases then decreases

d)

First decreases then increases

39.

Image formed by a plane mirror is

a)

vertically inverted

b)

Equidistant from object

c)

Real

40.

For us to be able to see an object

a)

there must be a source of light

b)

the light must strike the object

c)

the light must be reflected from the object to the eye

d)

all of these

41.

Objects that emit their own light are called (a)   objects

42.

The speed of light is:

a)

3×1083\times10^8 m/s

b)

3×109 3\times10^9\ m/s

c)

3×1073\times10^7 m/s

d)

3×1083\times10^8 km/s

43.

What is the name of an object that splits white light into all of the colors of the rainbow?

a)

prism

b)

cube

c)

opaque

d)

pyramid

44.

Kaleidoscope consist of three long strips of plane mirror placed at _____ angle forming a hollow prism

a)

45 degree

b)

60 degree

c)

90 degree

d)

any

45.

Cataract can be cured by using

a)

concave lens

b)

convex lens

c)

both

d)

surgery

46.

This defect is caused due to elongation of eye ball. ( myopia / hypermetropia)

(a)  

47.

Convex lens is used to correct this defect. ( myopia/ hypermetropia )

(a)  

48.

What is the Braille system used for?

a)

To enhance color perception

b)

To read and write for visually challenged persons

c)

To improve night vision

d)

To correct vision defects

49.

Which part of the eye is responsible for focusing light onto the retina?

a)

Cornea

b)

Lens

c)

Iris

d)

Pupil

50.

Which of the following is a common symptom of hyperopia?

a)

Double vision

b)

Blurred vision in low light

c)

Difficulty seeing close objects

d)

Difficulty seeing far away

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