Sunday, October 27, 2013

CBSE Class 10 - Science - Ch 11 - The Human Eye and the Colourful World (MCQs)

The Human Eye and the Colourful World
CBSE Class 10 - Physics - CH11: The Human Eye and the Colourful World (NCERT Q & A)
Dispersion of Light
Which light bends the most?
credits:wpclipart
(MCQs)

Q1: By which optical phenomenon, the splitting of white light into seven constituent colours occur?
(a) Refraction
(b) Reflection
(c) Dispersion
(d) Interference


Q2: A human eye can focus on objects at different distances by adjusting the focal length of the eye lens. This phenomenon is due to:

(a) near sightedness
(b) long sightedness
(c) accomodation
(d) persistence of vision


*Q3: Which of the following are the primary colours?
(a) Red, Blue, Yellow
(b) Red, Green, Violet.
(c) Yellow, Green Blue
(d) Red, Green, Blue


Q4(NCERT): The human eye forms the image of an object at its
(a) cornea
(b) iris
(c) pupil
(d) retina




Q5(NCERT): The least distance of distinct vision for a young adult with normal vision is about
(a) 25 m
(b) 2.5 cm
(c) 25 cm
(d) 2.5 m


Q6: A person cannot see objects clearly beyond 50 cm. The power of lens to correct the vision is:

(a) +5 D
(b) -0.5 D
(c) -2 D
(d) +2 D


Q7: Which phenomenon is responsible for the twinkling of stars?
(a) Atmosphere reflection
(b) Atmosphere refraction
(c) Reflection
(d) Total internal reflection


Q8(NCERT): The change in focal length of an eye lens is caused by the action of the
(a) pupil
(b) retina
(c) ciliary muscles
(d) iris


Q9: What is the time difference between actual sunset and apparent sunset?
(a) 2 s
(b) 20 s
(c) 2 minute
(d) 20 minute


Q10: When light passes through a prism, the colour which deviates the least is:

(a) red
(b) blue
(c) violet
(d) green


Q11: Which of the following optical phenomenon is used in cinematography or movie projectors?

(a) accomodation
(b) persistence of vision
(c) interference
(d) short sightedness



Answers:
1: (c) Dispersion
2: (c) accomodation
3: (a) Red, Blue, Yellow  option for Painting perspective (option is correct (d) Red, Green, Blue for Computer Graphics)
4: (d) retina
5: (c) 25 cm
6: (c) -2 D
7: (b) Atmosphere refraction
8: (c) ciliary muscles
9: (c) 2 minute
10: (a) red
11: (b) persistence of vision



4 comments:

  1. the third answer is the wrong one its option (a).
    thank you

    ReplyDelete
    Replies
    1. Thanks Megha for the correction. Answer is updated now.

      Delete
    2. no its correct a and d both are correct

      Delete
  2. no third should be red ,blue,and green .these are only the primary colours

    ReplyDelete