Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

If the far point of an eye is at 4 m, then identify the defect of the eye and the lens needed to correct this.

A
Hypermetropic and needs 1.25 D lens.

B
Hypermetropic and needs +2.5 D lens.

C
Myopic and needs +0.25 D lens.

D
Myopic and needs 0.25 D lens.
Question 2
1 / -0

Which of the following is a natural phenomenon that shows dispersion of light?

A
Rainbow

B
Tsunami

C
Thunder

D
Lightning

Solution

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows is formed when sunlight on passing through water droplets splits into seven colors.Splitting is due to the fact that different color light travel with different speed in water droplets.
Hence rainbow is based on dispersion of light.
Question 3
1 / -0

For a normal unaided eye the least converging power of the eye lens behind the cornea is 20D and the cornea itself has some converging power. The distance between the retina and the cornea-eye lens can be approximated to 5/3cm. Converging power of the cornea is give by:

A
2.5D

B
40D

C
60D

D
19.4D
Question 4
1 / -0

Which of these options is correct?

A
During noon the scattering of sunlight is maximum

B
Magnified images cannot be formed by concave lenses

C
Images formed by convex lenses are always virtual

D
A diamond absorbs most of the light falling on it

Solution

Sunlight when coming from sun to earth gets scattered by the atmosphere microscopic particles.Longer the path the sunlight takes more will be scattering.At noon the path between sun and earth is minimum so minimum scattering takes place at noon.Option A is wrong.
A concave lens always forms virtual, erect and diminished image.So magnified image cannot be fromed by a concave lens .Option B is right.
Images formed by convex lenses can be both virtual and real.Option C is wrong.
A diamond reflects most of the light falling on it.It hardly absorbs light.Option D is wrong.
Question 5
1 / -0

A light ray of a single wavelength is incident on the prism. The emergent light is best described by a:

A
spectrum of component colours.

B
laterally shifted ray of same wavelength.

C
light ray of same wavelength deviated by an angle.

D
light ray of different wavelength deviated by an angle.

Solution

When the light ray of a single wavelength is incident on the prism, it cannot be split into further colours.
Wavelength of emergent ray does not change since final medium is air.
It is deviated by an angle due to the refraction through prism.
Question 6
1 / -0

Identify the effects produced by the scattering of sunlight by the earths atmosphere.

A
Only (i) and (ii)

B
Only (ii) and (iii)

C
Only (i) and (iii)

D
(i), (ii) and (iii)

Solution

Scattering of light is the phenomenon in which light rays get deviated from its straight path on striking an obstacle like dust or gas molecules, water vapours etc. Appearance of sky in blue colour and the red colour of sun at sunrise is the effects produced by the scattering of light by the atmosphere.
The formation of mirage is due to the total internal reflection of light.
Question 7
1 / -0

If the image of distant objects is formed in front of the retina, the defect of vision may be:

A
Myopia

B
Hypermetropia

C
Cataract

D
Astigmatism

Solution

Nearsightedness (myopia) is a common vision condition in which you can see objects near to you clearly, but objects farther away are blurry. It occurs when the shape of your eye causes light rays to bend (refract) incorrectly, focusing images in front of your retina instead of on your retina.
Question 8
1 / -0

Analyse the given statements and choose the correct option.
Statement 1 : When a ray of light passes through a prism, it bends towards the thicker part of the prism.
Statement 2 : An incident ray strikes a prism, undergoes refraction and comes out as emergent ray.

A
Both statement 1 and statement 2 are CORRECT and statement 2 is the CORRECT explanation of the statement 1.

B
Both statement 1 and statement 2 are CORRECT, but statement 2 is NOT THE CORRECT explanation of the statement 1.

C
Statement 1 is CORRECT, but statement 2 is INCORRECT.

D
Statement 1 is INCORRECT, but statement 2 is CORRECT.
Question 9
1 / -0

The power of accommodation for the normal eye is:

A
40 D

B
0.4 D

C
4 D

D
44 D

Solution
Question 10
1 / -0

A person is suffering from myopia. Then :

A
he can not see anything.

B
he cannot see distant objects clearly.

C
he can see only distant objects.

D
he can not see nearly objects.

Solution

Myopia is a condition of the eye where the light that enters the eye does not directly focus on the retina but in front of it. This makes a distant object out of focus. But with this defect a person can see close objects quite clearly.

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Re-Attempt Weekly Quiz Competition

Human Eye and Colourful World Test - 30

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Human Eye and Colourful World Test - 30

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Question 1

Hypermetropic and needs 1.25 D lens.

Hypermetropic and needs +2.5 D lens.

Myopic and needs +0.25 D lens.

Myopic and needs 0.25 D lens.

Question 2

Rainbow

Tsunami

Thunder

Lightning

Solution

Question 3

2.5D

40D

60D

19.4D

Question 4

During noon the scattering of sunlight is maximum

Magnified images cannot be formed by concave lenses

Images formed by convex lenses are always virtual

A diamond absorbs most of the light falling on it

Solution

Question 5

spectrum of component colours.

laterally shifted ray of same wavelength.

light ray of same wavelength deviated by an angle.

light ray of different wavelength deviated by an angle.

Solution

Question 6

Only (i) and (ii)

Only (ii) and (iii)

Only (i) and (iii)

(i), (ii) and (iii)

Solution

Question 7

Myopia

Hypermetropia

Cataract

Astigmatism

Solution

Question 8

Both statement 1 and statement 2 are CORRECT and statement 2 is the CORRECT explanation of the statement 1.

Both statement 1 and statement 2 are CORRECT, but statement 2 is NOT THE CORRECT explanation of the statement 1.

Statement 1 is CORRECT, but statement 2 is INCORRECT.

Statement 1 is INCORRECT, but statement 2 is CORRECT.

Question 9

40 D

0.4 D

4 D

44 D

Solution

Question 10

he can not see anything.

he cannot see distant objects clearly.

he can see only distant objects.

he can not see nearly objects.

Solution

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