Human Eye and Colourful World Test

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Human Eye and Colourful World Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

The amount of light entering the eye is controlled by

A
Ciliary muscles

B
Cornea

C
Lens

D
Iris

Solution

The amount of light entering the eye is controlled by the iris by changing the size of the pupil.
Question 2
1 / -0

Light from an object enters the eye through the pupil and travels to the back of the eye, forming an image on the retina. What is the orientation of the retinal image, as compared to that of the original object?

A
Upside down

B
Turned to the left

C
Turned to the right

D
Same direction

Solution

The image will be upside down. As it passes the lens, it gets inverted.
Question 3
1 / -0

Which colour is strongly scattered by the molecules of air and other fine particles?

A
Green

B
Red and Blue both

C
Red

D
Blue

Solution

Air molecules present in the atmosphere are smaller. Thus, when sunlight falls on smaller air molecules, larger wavelengths are not scattered and sky appears blue.
Question 4
1 / -0

As we increase the distance of an object from the eye, the image distance:

A
decreases.

B
increases.

C
remains same.

D
First increases then decreases.

Solution

The image distance of an eye remains same as the change in distance of an object is compensated by the change in focal length of eyes by expansion and tightening of eye muscles.
Question 5
1 / -0

The blue colour of the sky is due to the fact that:

A
blue is the natural colour of sky.

B
blue light is preferentially scattered.

C
Red light is preferentially scattered.

D
red light is absorbed.

Solution

The blue colour of the sky is due to the fact that blue light is preferentially scattered.
Question 6
1 / -0

For which colour, the refractive index of glass is maximum?

A
Red

B
Yellow

C
Violet

D
Green

Solution

n = c/v

As, v_violet < v_red, therefore, n_violet > n_red.
Question 7
1 / -0

The near point of a human eye is at a distance of

A
40 cm

B
10 cm

C
20 cm

D
25 cm

Solution

Near point is the point up to which the normal human eye can see the objects clearly without straining the eyes. Its value is 25 cm.
Question 8
1 / -0

When light rays from stars enter into earth's atmosphere, it travels from

A
denser medium to vacuum

B
denser to rarer medium

C
rarer medium to vacuum

D
rarer to denser medium

Solution

Light travels from rarer to denser medium when it enters into earth's atmosphere.
Question 9
1 / -0

At sunrise or sunset, the sun looks reddish, because:

A
of the effects of reflection and refraction.

B
the sun is hottest at those times.

C
the sun is coldest at those times.

D
of the scattering of light.

Solution

At sunrise or sunset, the sun looks reddish, because of the scattering of light. Red light is scattered most because the light has to pass through a thick atmosphere.

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Re-Attempt Weekly Quiz Competition

Human Eye and Colourful World Test - 4

Result

Human Eye and Colourful World Test - 4

Score

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Rank

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SHARING IS CARING

Question 1

Ciliary muscles

Cornea

Lens

Iris

Solution

Question 2

Upside down

Turned to the left

Turned to the right

Same direction

Solution

Question 3

Green

Red and Blue both

Red

Blue

Solution

Question 4

decreases.

increases.

remains same.

First increases then decreases.

Solution

Question 5

blue is the natural colour of sky.

blue light is preferentially scattered.

Red light is preferentially scattered.

red light is absorbed.

Solution

Question 6

Red

Yellow

Violet

Green

Solution

Question 7

40 cm

10 cm

20 cm

25 cm

Solution

Question 8

denser medium to vacuum

denser to rarer medium

rarer medium to vacuum

rarer to denser medium

Solution

Question 9

of the effects of reflection and refraction.

the sun is hottest at those times.

the sun is coldest at those times.

of the scattering of light.

Solution

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