RBSE Class 10 Science MCQs Chapter 10 The Human Eye and the Colourful World

RBSE Class 10 Science Chemistry Chapter 10 The Human Eye and the Colourful World MCQs (Objectives) are very important for students preparing for Board Exams. These MCQS have been prepared on the basis of important topics of The Human Eye and the Colourful World

In this post, you will find high- quality, exam oriented MCQs with answers prepared according to the latest RBSE Class 10 Science syllabus.

Whether you are a student looking for quick revision or a teacher searching for readymade study material, this post is for you.

The Human Eye and the Colourful World Objectives with Answers

 Multiple Choice Questions  

Choose the correct answer

1. Light enters the eyes through

(a)  pupil                               

(b) Iris

(c) Cornea                             

(d) Retina

Correct answer- (c)

Explanation – Cornea is the transparent part of eye so light enter through it.

2. In human eye, image is formed at

(a)pupil                                 

(b)iris

(c)cornea                               

(d)retina

Correct answer- (d)

Explanation –After refection by the eye lens. Light rays get focused on retina. So image is formed at retina.

3. Amount of entering light is adjusted by

(a) pupil                                

(b)iris

(c)cornea                               

(d)retina

Correct answer- (a)

Explanation – Pupil is a small hole in Iris of eye, light enters through pupil. It expands and contracts according to intensity of light.

4. The size of pupil is controlled by

(a) iris                      

(b)ciliary muscles

(c) cornea                              

(d)all the above

Correct answer- (a)

Explanation – Pupil is small hole in iris and its expansion and contraction is controlled by iris.

5. Focal length of the eye lens is changed by

(a) iris                            

(b)ciliary muscles

(c) cornea                              

(d)all the above

Correct answer- (b)

Explanation – Eye lens is attached with ciliary muscles. These ciliary muscles contract and expand, due to which focal length of the lens is changed.

6. The diameter of eye ball is

(a) 1.3 cm                             

(b)2.5 cm

(c)  3.3 cm                           

(d)2.3 cm

Correct answer- (d)

7. When ciliary muscles are relaxed the focal length of eye lens is

(a) 1.3 cm                             

(b)2.5 cm

(c)  3.3 cm                           

(d)2.3 cm

Correct answer- (b)

Explanation – 25 cm is the near point of a healthy eye at which objects can be seen clearly without any stress.

8. A person can see an object when its image is formed

(a) infront of the retina               

(b)away from the retina

(c)  infront of cornea                   

(d) at the retina

Correct answer- (d)

9. The least distance of distinct vision is

(a)  25cm                              

(b)35 cm

(c)  30 cm                            

(d)infinity

Correct answer- (a)

Explanation – 25 cm is the least distance of distinct vision and it is also known as near point of eye.

10.    The far point of the normal vision is

(a) 25cm                               

(b)35 cm

(c)  30 cm                            

(d)infinity

Correct answer- (d)

Explanation – A health eye can see far objects like stars that are at infinity distance.

11.   A convex lens is used to rectify

(a) myopia                            

(b)presbyopia

(c) hypermetropia                  

(d) astigmatism

Correct answer- (c)

Explanation – A person with hypermetropia cannot see nearby objects clearly so convex lens is used to rectify this eye defect.

12.  When focal length of eye lens, increases permanently, it result in 

(a) myopia                            

(b)presbyopia

(c) hydpermetropia                

(d) astigmaism

Correct answer- (c)

Explanation - Focal length of eye lens increases, near point of eye goes far away so person can’t see nearby objects and it result in hypermetropia.

13.   In the beginning of cataract a person

(a) cannot see in dim-light         

(b)sees all the objects of white colour

(c) cannot distinguish in certain colours

(d)can see using a lens of power

Correct answer- (a)

14.   Ageing results in

(a) myopia                            

(b)presbyopia

(c) hydpermetropia                     

(d)astigmaism

Correct answer- (b)

Explanation – Power of accommodation of eye lens decreases with ageing and cause presbyopia.

15.A person cannot simultaneously focus on both horizontal and vertical lines, he is suffering from

(a) myopia                            

(b)presbyopia

(c) hydpermetropia                

(d)astigmaism

Correct answer- (d)

16.  Elongation of eye ball results

(a) myopia                            

(b)presbyopia

(c)  hydpermetropia                           

(d)all the above

Correct answer- (a)

17.   The lens used to rectify myopia is

(a) convex                            

(b)concave

(c) cylindrical                       

(d)bifocal

Correct answer- (b)

18.     The lens used to rectify astigmatism is

(a) convex                            

(b)concave

(c) cylindrical                       

(d)bifocal

Correct answer- (c)

Explanation – Concave lens is used to see far objects clearly.

19.  The lens used to rectify hypermetropia is

(a) convex                            

(b)concave

(c) cylindrical                       

(d)bifocal

Correct answer- (a)

20.An old person cannot see nearby and distant objects, he should use

(a) convex                            

(b)concave

(c) cylindrical                       

(d)bifocal

Correct answer- (d)

Explanation – In bifocal length both concave and convex lenses are used.

21.  Cataract can be corrected by using

(a) convex lens                     

(b)concave lens

(c) bifocal lens                     

(d)it cannot be corrected by use of lens

Correct answer- (d)

22. The person cannot donate eyes, who is suffering from

(a) asthma                             

(b)hypertension

(c) diabetes                           

(d)leukemia

Correct answer- (d)

23.   Rainbow is caused due to .............. of light.

(a) reflection                        

(b)refraction

(c) dispersion                        

(d)all the above

Correct answer- (d)

Explanation – At the time of rain, sunlight passes through water droplets and get refracted , reflected and dispersed , due to this rainbow is formed in the sky.

24.   Very fine particles scatter mainly

(a) red light                                 

(b)blue light

(c) green light                       

(d)all the light

Correct answer- (b)

25.The time difference between actual sunset and the apparent sunset is about

(a)  4 minutes                       

(b)6 minutes

(c) 2 minutes                              

(d)15 minutes

Correct answer- (c)

26.  A student sitting on the last bench can read the letters, written on the blackboard but cannot read the book. The correct statement about him, is

(a)  the far point of his eyes has come closer to him

(b) the far point of his eyes has receded away

(c)  the near point of his eyes has come closer to him

(d) the near point of his eyes has receded away

Correct answer- (d)

Explanation – when a person can’t see nearby objects clearly. It means the near point of his eye has gone far away.

27.Regarding the propagation of light, the correct statement is

(a) red light mover fastest                 

(b)blue light moves fastest

(c)  lights of all colours move with the same speed

(d)  red light moves faster than orange light

Correct answer- (c)

28.    The clear sky appears blue, because

(a)  in the noon, infra-red rays are absorbed                        (b)  blue and violet colour lights are scattered more than all other colours by the atmosphere 

(c)  blue light gets absorbed in the atmosphere

(d)  light of other colours, except violet and blue are scattered more

Correct answer- (b)

Explanation – blue and violet colours of the sunlight are scattered by small particles of the upper layer of the atmosphere.

29.    At noon the sun appears white, because

(a)  all the colours of white light are scattered away

(b)  blue and red colour lights are absorbed

(c)  in the noon, infra red rays are absorbed

(d)  blue and red colour lights are scattered move

Correct answer- (a)

30.       Twinkling of stars takes place due to atmospheric

(a)  internal reflection of light by clouds

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

(c)  scattering of light by dust particles

(d)  dispersion of light by water droplets

Correct answer- (b)

31.   Signals or danger signals are mostly red because red light is scattered

(a) the least by smoke or fog      

(b)the  most by smoke or fog

(c) not at all                            

 (d)attractively

Correct answer- (a)

Explanation – Red light is of long wavelength.

32.  Clouds generally appear white due to

(a) absorption of all colours of light 

(b)scattering of all colours of light

(c) reflection of light                  

(d)refraction of light

Correct answer- (b)

33.     Deep water appears blue due to

(a)  algae and other aquatic plants present

(b)image of blue sky

(c)  scattering of light                 

(d)absorption of light by deep water

Correct answer- (c)

34.  Light entering the eye, gets the most refraction at the

(a)  iris                           

(b)outer surface of the cornea

(c) crystalline lens                       

(d)pupil

Correct answer- (b)

35. At sun rise or sun set, sun and surrounding sky appears red due to

(a)  total internal reflection of light  

(b) refraction of light through the atmosphere

(c)  at sun rise or sun set, red light of longer wavelength can reach our eyes

(d) dispersion of light

Correct answer- (c)

 

    36.  A person cannot see distinct object kept beyond 2 m. the defect cane be corrected by using a lens of power-

(a)+0.5D

(b)-0.5D

(c)+0.2D

(d)-0.2D

Correct answer- (b)

 

 37.The focal length of eye lens increases when eye muscles–

(a)contract and lens becomes thicker

(b) are relaxed and lens becomes thinner

(c) are relaxed and lens becomes thicker

(d) contract and lens becomes thinner

Correct answer- (b)

 

 

   38.   Which of the following is correct?

  (a)  A person with hypermetropia cannot see distant objects clearly

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

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

    (d)      A person with myopia can see distant objects clearly

Correct answer- (b)

Explanation – A person with myopia can see nearby objects clearly but can’t see distant objects clearly as his far point becomes nearer than infinity. It is also called near- sightedness.

   39. In an experiment  to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray-

   (a)       Is parallel to the incident ray

    (b)      perpendicular to the incident ray

    (c)       is parallel to the refracted ray

    (d)      bands at an angle to the direction of incident ray

 

    Correct answer –(d)

  40.The property related to the sense of continuity of vision is called

(a)Colour blindness

(b)Optical illusion

(c) Persistence of vision

(d) None of these

Correct answer –(c)

    41.The focal length of the eye lens increases when eye muscles

(a) contract  and lens becomes thicker

(b) are relaxed and lens becomes thinner

(c) are relaxed and lens becomes thicker

(d) contract and lens becomes thinner

Correct answer –(b)

   42.  The message of image formation is conveyed to the brain by

   (a)       Cornea

    (b)      Yellow spot

    (c)       Optical nerves

    (d)      Ciliary muscles

   

    Correct answer – (c)

 

    43.   Colour blindness is due to the absence of

    (a)       Rod shapped cells

     (b)      Cone –shapped cells

     (c)       Both (a) and (b)

     (d)      None of these

  

     Correct answer- (b)