Chapter 11 · The Human Eye and the Colourful World

NCERT Exemplar Class 10 Science Chapter 11 Multiple Choice Questions

All 14 questions of NCERT Exemplar Class 10 Science Chapter 11 Multiple Choice Questions (The Human Eye and the Colourful World), in the book's order, each with its answer and a step-by-step solution.

1. Q1
   A person ​cannot see distinctly ​objects kept beyond $2$ m. This ​defect can be corrected ​by ​using ​a lens of ​power

   1. (a)$+0.5$ D
   2. (b)$-0.5$ D
   3. (c)$+0.2$ D
   4. (d)$-0.2$ D
   Show answer

   (b) $-0.5$ D

   Step-by-step solution →
2. Q2
   A student sitting on ​the last ​bench can ​read the letters written on the blackboard ​but ​is not ​able ​to read the letters written in his text book. Which of the following statements is ​correct?

   1. (a)The near point of his eyes has receded away
   2. (b)The near point of his eyes has come closer to him
   3. (c)The far point of his eyes has come closer to him
   4. (d)The far point of his eyes has receded away
   Show answer

   (a) The near point of his eyes has receded away

   Step-by-step solution →
3. Q3
   A prism ABC (with BC as base) is placed in ​different orientations. A narrow beam of white light is incident on the prism as shown in Figure 11.1. ​In which ​of the following ​cases, after ​dispersion, the third ​colour from the top corresponds to ​the ​colour of the sky?

   1. (a)(i)
   2. (b)(ii)
   3. (c)(iii)
   4. (d)(iv)
   Show answer

   (b) (ii)

   Step-by-step solution →
4. Q4
   At noon ​the ​sun ​appears ​white as

   1. (a)light is least scattered
   2. (b)all the colours of the white light are scattered away
   3. (c)blue colour is scattered the most
   4. (d)red colour is scattered the most
   Show answer

   (a) light is least scattered

   Step-by-step solution →
5. Q5
   Which of ​the following ​phenomena of ​light are ​involved in ​the formation ​of a ​rainbow?

   1. (a)Reflection, refraction and dispersion
   2. (b)Refraction, dispersion and total internal reflection
   3. (c)Refraction, dispersion and internal reflection
   4. (d)Dispersion, scattering and total internal reflection
   Show answer

   (c) Refraction, dispersion and internal reflection

   Step-by-step solution →
6. Q6
   Twinkling ​of stars ​is due ​to ​atmospheric

   1. (a)dispersion of light by water droplets
   2. (b)refraction of light by different layers of varying refractive indices
   3. (c)scattering of light by dust particles
   4. (d)internal reflection of light by clouds
   Show answer

   (b) refraction of light by different layers of varying refractive indices

   Step-by-step solution →
7. Q7
   The clear ​sky ​appears ​blue because

   1. (a)blue light gets absorbed in the atmosphere
   2. (b)ultraviolet radiations are absorbed in the atmosphere
   3. (c)violet and blue lights get scattered more than lights of all other colours by the atmosphere
   4. (d)light of all other colours is scattered more than the violet and blue colour lights by the atmosphere
   Show answer

   (c) violet and blue lights get scattered more than lights of all other colours by the atmosphere

   Step-by-step solution →
8. Q8
   Which ​of the following statements is ​correct regarding ​the propagation ​of light ​of different colours ​of white ​light ​in air?

   1. (a)Red light moves fastest
   2. (b)Blue light moves faster than green light
   3. (c)All the colours of the white light move with the same speed
   4. (d)Yellow light moves with the mean speed as that of the red and the violet light
   Show answer

   (c) All the colours of the white light move with the same speed

   Step-by-step solution →
9. Q9
   The ​danger ​signals installed at the ​top of tall buildings are red in colour. ​These can be easily ​seen from a distance because among all other colours, the ​red ​light

   1. (a)is scattered the most by smoke or fog
   2. (b)is scattered the least by smoke or fog
   3. (c)is absorbed the most by smoke or fog
   4. (d)moves fastest in air
   Show answer

   (b) is scattered the least by smoke or fog

   Step-by-step solution →
10. Q10
    Which of ​the following phenomena contributes ​significantly to the ​reddish appearance ​of the sun at sunrise ​or ​sunset?

    1. (a)Dispersion of light
    2. (b)Scattering of light
    3. (c)Total internal reflection of light
    4. (d)Reflection of light from the earth
    Show answer

    (b) Scattering of light

    Step-by-step solution →
11. Q11
    The bluish ​colour ​of ​water ​in ​deep sea is ​due ​to

    1. (a)the presence of algae and other plants found in water
    2. (b)reflection of sky in water
    3. (c)scattering of light
    4. (d)absorption of light by the sea
    Show answer

    (c) scattering of light

    Step-by-step solution →
12. Q12
    When light ​rays ​enter the eye, most of ​the refraction ​occurs ​at ​the

    1. (a)crystalline lens
    2. (b)outer surface of the cornea
    3. (c)iris
    4. (d)pupil
    Show answer

    (b) outer surface of the cornea

    Step-by-step solution →
13. Q13
    The ​focal ​length of the ​eye lens ​increases when ​eye muscles

    1. (a)are relaxed and lens becomes thinner
    2. (b)contract and lens becomes thicker
    3. (c)are relaxed and lens becomes thicker
    4. (d)contract and lens becomes thinner
    Show answer

    (a) are relaxed and lens becomes thinner

    Step-by-step solution →
14. Q14
    Which of ​the ​following ​statement is ​correct?

    1. (a)A person with myopia can see distant objects clearly
    2. (b)A person with hypermetropia can see nearby objects clearly
    3. (c)A person with myopia can see nearby objects clearly
    4. (d)A person with hypermetropia cannot see distant objects clearly
    Show answer

    (c) A person with myopia can see nearby objects clearly

    Step-by-step solution →