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Unit Test: Human Eye and the Colourful World - UPSC MCQ


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10 Questions MCQ Test Science & Technology for UPSC CSE - Unit Test: Human Eye and the Colourful World

Unit Test: Human Eye and the Colourful World for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The Unit Test: Human Eye and the Colourful World questions and answers have been prepared according to the UPSC exam syllabus.The Unit Test: Human Eye and the Colourful World MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Unit Test: Human Eye and the Colourful World below.
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Unit Test: Human Eye and the Colourful World - Question 1

The human eye forms the image of an object at its

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 1

The retina is the inner back portion of the eye. It is composed of an enormous number of light-sensitive cells.
The lens forms an image of the visual world on the retina through the cornea.
Light-sensitive cells of the retina get activated upon illumination and generate electric signals.
Optic nerves send these electric signals to the brain, where these signals finally processed and interpreted to see an object as they are.

Unit Test: Human Eye and the Colourful World - Question 2

The light coming from an object enters the eye through:

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 2

Light enters the eye through the cornea and from the cornea, the light passes through the pupil.
The iris, or the colored part of your eye, controls the amount of light passing through. From there, it then hits the lens.

Unit Test: Human Eye and the Colourful World - Question 3

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 ?

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 3

The image will be upside down. As it passes the lens, it gets inverted.

Unit Test: Human Eye and the Colourful World - Question 4

The change in the focal length of an eye lens is caused by the action of

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 4

The ciliary muscles change the focal length of the eye lens by changing its shape.

Unit Test: Human Eye and the Colourful World - Question 5

The fluid between the retina and the lens is called

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 5

The space between the lens and the retina is called Vitreous Body and is filled with a transparent gel called Vitreous Humorous.

Unit Test: Human Eye and the Colourful World - Question 6

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

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 6

There is no change to the image distance in the eye when we increase the distance of an object from the eye.

To see closer or distant objects clearly, the eyes, due to their accommodation, can increase or decrease the focal length of its lens, by contraction and relaxation of ciliary muscles, so that the image is always formed at the retina.

Unit Test: Human Eye and the Colourful World - Question 7

Ability of the eye to see objects at all distances is called

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 7

Changes in the contraction of the ciliary muscles alter the focal distance of the eye, causing nearer or future images to come into focus on the retina; this process is known as accommodation.

Unit Test: Human Eye and the Colourful World - Question 8

The focal length of the eye lens increases when eye muscles

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 8

The focal length of the eye lens increases when eye muscles relaxed and becomes thinner. The sharp image of the distant object is formed at the retina. This enables us to focus accurately on distant objects.

Unit Test: Human Eye and the Colourful World - Question 9

Electric nerve impulses from the retina to brain are conveyed by

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 9
  • The lens in turn focuses the light rays onto the retina, lining the back of the eye.
  • The retina converts the image formed by the light rays into nerve impulses.
  • The optic nerve, composed of the axons of the retina's ganglion cells, then transmits these impulses from the eye to the first visual relay in the brain.
Unit Test: Human Eye and the Colourful World - Question 10

The combination responsible for admitting different amounts of light into eye is

Detailed Solution for Unit Test: Human Eye and the Colourful World - Question 10

The function of pupil is to control the amount of light entering the eye and the iris controls the pupil.

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