Light Test

Result

Light Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Function of optic nerve in human eye:

A
Image is modified by the optic nerves

B
Electric signals are generated on the retina are carried by the optic nerve to the brain

C
Image brightness is reduced by the optic nerve

D
All the above

Solution

The light sensitive cells of the retina gets activated with the incidence of light and generates electric signals. The electric signals are sent to the brain by the optic nerve and the brain interprets the electric signals in such a way that we see an image which is erect and of the same size as the object.
Question 2
1 / -0

A night bird (owl) can see very well in the night but not during the day

A
Owl has more rods compared to cones

B
Owl has a large cornea and a large pupil

C
Both true

D
None

Solution

A night bird like owl has more rods compared to cones .also the bird has a large cornea and a large pupil to allow more light to enter its eye.the night are therefore able to see very well even during night.
Question 3
1 / -0

Vitamin A deficiency in food can cause :

A
blurred vision

B
eye defects

C
night blindness

D
all of these

Solution

Continuous lack of vitamin A can cause many eye defects including blurred vision and night blindness because vitamin A is responsible for proper functioning of photo-receptors.
Question 4
1 / -0

Artists use KALEIDOSCOPE for:

A
Entertaining themselves

B
Getting ideas for new patterns

C
Discovering new properties of light

D
None of these

Solution

Artists and designers use KALEIDOSCOPE to get ideas for new patterns.
Kaleidoscopes can be used for viewing and replicating repetitive patterns. Beautiful patterns are formed in a kaleidoscope because of multiple reflections.
Question 5
1 / -0

Insufficient light can cause:

A
headache

B
eye strain

C
both headache and eye strain

D
blindness

Solution

Too little or too much light is not good for eyes. It can cause headache and eye strain.
Question 6
1 / -0

While making a kaleidoscope, a transparent plastic sheet is pasted under the cardboard disc in order to:

A
give it an attractive look

B
make the disc durable

C
hold some air inside

D
make patterns more colourful

Solution

In a kaleidoscope, for making the disc durable, a piece of transparent plastic sheet is pasted under the cardboard disc.
Question 7
1 / -0

Night blindness is due to:

A
Excess of vitamin A

B
Deficiency of vitamin A

C
Deficiency of vitamin B

D
None

Solution

Lack of vitamin A in foodstuff is responsible for many eye troubles. Most common amongst them is night blindness. One should, therefore, include in the diet components which have vitamin ARaw carrots, broccoli and green vegetables (such as spinach) and cod liver oil are rich in vitamin A. Eggs, milk, curd, cheese, butter and fruits such as papaya and mango are also rich in vitamin A.
Question 8
1 / -0

Mark the correct statement:
a. Blind spot position varies between the left eye and the right eye.
b. For both the eyes blind spot is not exactly in the same place.
c. Octopus do not have the Blind spot.

A
a and b

B
b and c

C
a and c

D
All

Solution

Blind spot position varies in both eyes. Octopus do not have any blind spot.A point in our eyes where no image is formed,that point is known as blind spot.
Question 9
1 / -0

Fruits and vegetables advisable for good vision are:

A
apple, banana, carrots

B
mango, papaya, carrots

C
cabbage, sunflower oil, groundnut

D
all fruits and vegetables

Solution

Mango, papaya, raw carrots, spinach, broccoli etc are good for eyes because they are rich in vitamin A.
Question 10
1 / -0

Who discovered Braille system?

A
Franklin Braille

B
Stephen Braille

C
Louis Braille

D
Peter Braille

Solution

Louis Braille,himself was a visually challenged person. He developed a system to read, for visually challenged person known as Braille system.

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Re-Attempt Weekly Quiz Competition

Light Test - 20

Result

Light Test - 20

Score

-

Rank

-

SHARING IS CARING

Question 1

Image is modified by the optic nerves

Electric signals are generated on the retina are carried by the optic nerve to the brain

Image brightness is reduced by the optic nerve

All the above

Solution

Question 2

Owl has more rods compared to cones

Owl has a large cornea and a large pupil

Both true

None

Solution

Question 3

blurred vision

eye defects

night blindness

all of these

Solution

Question 4

Entertaining themselves

Getting ideas for new patterns

Discovering new properties of light

None of these

Solution

Question 5

headache

eye strain

both headache and eye strain

blindness

Solution

Question 6

give it an attractive look

make the disc durable

hold some air inside

make patterns more colourful

Solution

Question 7

Excess of vitamin A

Deficiency of vitamin A

Deficiency of vitamin B

None

Solution

Question 8

a and b

b and c

a and c

All

Solution

Question 9

apple, banana, carrots

mango, papaya, carrots

cabbage, sunflower oil, groundnut

all fruits and vegetables

Solution

Question 10

Franklin Braille

Stephen Braille

Louis Braille

Peter Braille

Solution

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