Human Eye and Colourful World Test

Result

Human Eye and Colourful World Test - 39

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The figure above shows the eye suffering from :

A
hypermetropia

B
myopia

C
astigmatism

D
short-sightedness

Solution

In hypermetropia the image is formed behind the retina.
Question 2
1 / -0

Which of the following lens is used to minimise hypermetropia ?

A
Convex lens

B
Concave lens

C
Cylindrical lens

D
Planar lens

Solution

A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. The near point, for the person, is farther away from the normal near point $$(25\ cm)$$. This is because the light rays from a closeby object are focused at a point behind the retina. This defect can be corrected by using a convex lens of appropriate power
Question 3
1 / -0

Which of the following figures correctly represents the passage of white light through a prism?

A

B

C

D

Solution

We know that the speed of violet is least and that of red is maximum, when travelling through a material medium.

Using the relation of refractive index,

$$\mu = \dfrac{c}{v}$$

Since, $$v_{red}>v_{violet}$$

because of which refractive index property for violet will be greater than red.
$$\mu_{red}<\mu_{violet}$$

Therefore, violet will deviate the most and red the least.

Hence, the correct option is (A).
Question 4
1 / -0

At sunrise or sunset, the sun appears to be reddish white. This is because :

A
The sun is colder at sunrise or at sunset

B
Diffraction sends red rays to the earth at these times

C
Refraction causes this phenomenon

D
Scattering due to dust particles and air molecules causes the phenomenon

E
None of these

Solution

During sunset and sunrise, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun appears red.
Question 5
1 / -0

The figure above shows the eye suffering from :

A
hypermetropia

B
myopia

C
astigmatism

D
far-sightedness

Solution

In case of myopia, the image formed of object at infinity is in front of the retina because of increased power of eye lens that is why person can not see clearly distant object.
And the above diagram is similar to myopic condition.Hence It's myopia..
Question 6
1 / -0

Long-sightedness is to hypermetropia as short-sightedness is to :

A
myopia

B
focusing

C
astigmatism

D
accomodation

Solution

Long-sightedness is also called hypermetropia: Hypermetropia (long-sightedness) is a defect of an eye where a person cannot see nearby objects clearly.
Short-sightedness is also called myopia: Myopia (short-sightedness) is a defect of an eye where a person can not see distant objects clearly.
Question 7
1 / -0

The sky is blue because

A
There is more blue light in the sunlight

B
Of scattering of sunlight by air molecules in the atmosphere

C
Of scattering of sunlight by dust particles in the atmosphere

D
Other colours are absorbed by heavenly bodies

Solution

When a parallel beam of light passes through any medium full of molecules and other particles, light gets scattered in every possible direction due to presence of such molecules, dust particles etc.
Also,
Probability of scattering is proportional to $$\dfrac{1}{\lambda^4}$$
therefore, blue scatters more as it has smaller wavelength.
Question 8
1 / -0

Which of the following colour of light undergoes the maximum deviation while passing a glass prism?

A
Red

B
Blue

C
Violet

D
Green

Solution

Violet undergoes maximum deviation while passing through a prism because it has least wavelength , as we know,
We know, $$\nu\times \lambda=c$$
Frequency is a constant quantity.So velocity of VIOLET light will be least in the medium.
also,
$$\mu=\dfrac{velocity\ of\ light\ in\ vacuum}{velocity\ of\ light\ in\ a\ medium}$$
so, refractive index property for violet will be maximum and it will refract the most. and will have the greatest deviation.
Question 9
1 / -0

The angle between the original path of the incident ray and the emergent ray coming out of a prism is called angle of

A
incidence

B
reflection

C
prism

D
deviation

Solution

Angle of deviation is defined as the angle between incident ray and emergent ray or reflected ray.
Question 10
1 / -0

Which of the following lens is used to minimise myopia ?

A
Convex lens

B
Concave lens

C
Cylindrical lens

D
Planar lens

Solution

Near-sightedness, also known as short-sightedness or myopia, is a condition of the eye where light focuses in front of, instead of on the retina. This causes distant objects to be blurry while close objects appear normal. Hence a diverging lens or a concave lens is used to fix the problem.