CBSE Class 10 Science Worksheet
Unit III: Natural Phenomenon - Human Eye and Colorful World
1.
Which light bends the most when the white light is passed through the prism?
A)
Violet
B)
Green
C)
Yellow
D)
Red
2.
Choose the correct option: For total internal reflection light, rays should travel from ________.
A)
Denser to rarer medium
B)
Rarer to denser medium
C)
Any medium
D)
None of these
3.
The human eye forms the image of an obect at
A)
in front of the retina
B)
behind the retina
C)
on retina
D)
none of the above
4.
State TRUE/FALSE: Optical fibres utilise the principal of total internal reflection for the transmission of data.
A)
true
B)
0
5.
Choose the correct statement.
A)
The atmosphere bends
starlight away from the normal
B)
The atmosphere bends
starlight towards the normal
C)
The atmosphere doesn't bends
starlight
D)
None of these
6.
What is the far point and near point of the human eye with normal vision?
7.
Which type of lens should be used to correct presbyopia?
A)
Concave
B)
Convex
C)
Bi- focal
D)
Plane
8.
Choose the correct option: The nature of image formed on the retina of the eye is ______.
A)
Virtual and inverted
B)
Real and inverted
C)
Virtual and erect
D)
Real and erect
10.
Choose the correct option: The splitting of white light into seven colours is known as ________.
A)
Dispersion
B)
Spectrum
C)
Refraction
D)
Reflection
11.
Why is it difficult to drive on a foggy day?
12.
Choose the correct option: The defect of vision which cannot be corrected by any type of spectacle lenses is ________.
A)
Cataract
B)
Hypermetropia
C)
Myopia
D)
None of these
13.
Which part of eye avoids internal reflections within the eye?
A)
Rods
B)
Choroids
C)
Iris
D)
Pupil
14.
Which colour of light has the longest wavelength?
A)
Violet
B)
Green
C)
Yellow
D)
Red
15.
The smallest distance, at which the eye can see objects clearly without strain, is called
A)
Far point of the eye
B)
Farthest point of the eye
C)
Near point of the eye
D)
Least point of the eye
16.
Why are the danger signal lights red in colour?
17.
A myopic eye is corrected by using
A)
cylindrical lens
B)
convex lens
C)
concave lens
D)
bifocal lens
18.
Fill in the blanks: The defect in which for a person the lines drawn parallel to one another appear distorted is called ___________.
19.
State TRUE/FALSE: ABC is a right-angled prism with AC being the longest side. A light ray enters through AC at right angles and hits AB, reflects and then goes out through BC. Then, this prism is an isosceles prism.
A)
true
B)
0
20.
Choose the correct option: The reddish appearance of the sun at sunrise or sunset is due to __________.
A)
Dispersion of light
B)
Total internal reflection of light
C)
Scattering of light
D)
None of these
CBSE Class 10 Science Worksheet
Unit III: Natural Phenomenon - Human Eye and Colorful World
Answers
1.
Option A
2.
Option A
3.
Option C
4.
Option A
5.
Option B
6.
Near point is 25 cm and far point is infinity.
7.
Option C
8.
Option B
9.
Stars are at a very far distance from Earth and they appear as point sized sources of light. The path of rays of light coming from the star goes on varying slightly due to atmospheric refraction. The apparent position of the star fluctuates and the amount of light entering our eyes flickers which give the twinkling effect.
10.
Option A
11.
On a foggy day, most of the light gets scattered by the particles in the fog and visibility reduces.
12.
Option A
13.
Option B
14.
Option D
15.
Option C
16.
The wavelength of red colour is the highest. The red is least scattered by fog or smoke.
17.
Option C
18.
Astigmatism
19.
Option B
20.
Option C
