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Uttarakhand Board Class 10 The Human Eye and the Colourful World — practice questions

Explore 32 free The Human Eye and the Colourful World questions in Uttarakhand Board Class 10 Science. Open each question or exercise to read its content, reference answers and available explanation.

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The Human Eye and the Colourful World questions and exercises with answers

Showing questions 1–30 of 32.

The light-sensitive layer at the back of the eyeball is the:Read the answer and worked solution →Most of the refraction of light entering the eye occurs at the:Read the answer and worked solution →The size of the pupil is controlled by the:Read the answer and worked solution →The ability of the eye to focus on objects at different distances by adjusting the focal length of the lens is called:Read the answer and worked solution →The least distance of distinct vision for a young adult is approximately:Read the answer and worked solution →The far point of a normal eye is:Read the answer and worked solution →Myopia is corrected using a:Read the answer and worked solution →Hypermetropia is corrected using a:Read the answer and worked solution →Presbyopia arises because:Read the answer and worked solution →A bifocal lens used for presbyopia + myopia has:Read the answer and worked solution →A myopic person has a far point of 1 m. The focal length of the corrective concave lens is:Read the answer and worked solution →A hypermetropic person has a near point of 1 m. The focal length of the corrective convex lens is:Read the answer and worked solution →The splitting of white light into its constituent colours by a prism is called:Read the answer and worked solution →Newton showed that white light can be reformed from the spectrum using:Read the answer and worked solution →A rainbow always forms in the sky:Read the answer and worked solution →The twinkling of stars is due to:Read the answer and worked solution →Planets do not twinkle as much as stars because:Read the answer and worked solution →The blue colour of the sky is best explained by:Read the answer and worked solution →In a young eye, the focal length range of the eye lens is approximately:Read the answer and worked solution →The phenomenon of dispersion was first scientifically demonstrated by:Read the answer and worked solution →Tyndall effect refers to:Read the answer and worked solution →A myopic person's far point is 50 cm. The corrective lens has power:Read the answer and worked solution →Cataract refers to:Read the answer and worked solution →A 10-cm-tall object placed 30 cm in front of a 20-cm concave mirror has an image at:Read the answer and worked solution →Scattering of light is most pronounced when the wavelength of light is:Read the answer and worked solution →The image formed on the retina by the human eye is:Read the answer and worked solution →A child cannot read words on the blackboard clearly. The likely defect and correction are:Read the answer and worked solution →Match each part of the eye to its jobRead the answer and worked solution →Myopia or hypermetropia?Read the answer and worked solution →Put the spectrum in orderRead the answer and worked solution →

Worked practice questions

The light-sensitive layer at the back of the eyeball is the:

  1. Retina
  2. Cornea
  3. Iris
  4. Pupil
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Correct answer: A. Retina

1. The retina lines the inner back surface of the eye. 2. It contains photoreceptors (rods and cones) that convert light into nerve signals. 3. The cornea is at the front, the iris controls the pupil aperture. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.1_

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Most of the refraction of light entering the eye occurs at the:

  1. Crystalline lens
  2. Cornea
  3. Retina
  4. Optic nerve
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Correct answer: B. Cornea

1. Light first enters the eye through the transparent cornea. 2. Because the cornea bulges and the air-cornea index difference is large, most bending happens there. 3. The crystalline lens contributes only a finer adjustment. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.1_

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The size of the pupil is controlled by the:

  1. Retina
  2. Cornea
  3. Iris
  4. Sclera
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Correct answer: C. Iris

1. The iris is the coloured muscular diaphragm behind the cornea. 2. It opens (dilates) or closes (constricts) the pupil aperture. 3. This regulates the amount of light entering the eye. _Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.1_

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