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The Human Eye and the Colourful World – Important Questions & Preparation Tips

Oct 9, 2013 16:47 IST

    CBSE Class 10th Chapter, The Human Eye and the Colourful World comes under the topic natural phenomena which covers major percentage of marks in exam. Exam experts of Jagranjosh.com offer the best practice material that covers all important questions so that students will not miss any portion while preparing for board exams or competitive exams.

    Consider the mentioned terms/questions at the time of studying.

    • Function of lens in human eye.

    • Draw a labeled diagram of a human eye and explain its functions?

    • What is the function of rods and cones?

    • Accommodation of eye and the least distance of distinct vision.

    • When entering a darkened cinema hall from bright light, we cannot see at first but gradually the vision becomes visible. Why?

    • Define myopia, hypermetropia and presbyopia?

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    • By just looking at the spectacles how can a person judge whether the spectacles is for long-sighted or short-sighted?

    • Draw a labeled diagram to show the defect of myopia and hypermetropia?

    • An old person finds difficulty in watching number board of a far bus? What defect is the person suffering from? How can it be corrected?

    • Explain the process of refraction of prism with the help of a labeled diagram?

    • Relation between the refraction through glass slab and through a prism?

    • Why do we get 7 colors? Explain

    • Which refracted most: Red light or violet light? Explain why?

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    • Interconnect the process of rainbow with that of dispersion through prism.

    • The process of stars twinkling at night and its displacement from its actual position when viewed from earth.

    • Reason for advanced sunrise and delayed sunset.

    • Deep water is blue in color? Reason.

    • Explain the process of blue color of sky and reddening of sun during sunset?

    • Tyndall effect with diagram

    • Why is danger signal board red in colour?

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    • Sun appears white at noon and red during sunset at the horizon. Why?

    • What causes the scattering of blue component of sunlight in the atmosphere?

    Given are the some sample questions

    1. With age Near point and Far point recedes due to A : Weakening of ciliary muscles B : Reducing ability to change the focal length

    a. 'A' is correct
    b. B' is correct
    c. Both 'A' and 'B' are correct
    d. Neither 'A' nor 'B' is correct

    2. A long-sighted person cannot see objects nearer to his eye than 50 cm. To enable him to read a book 25 cm away, he should use spectacle lenses whose power in dioptres is
    a. -6
    b. -4
    c. -2
    d. +4

    3. Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
    a. Red light moves fastest.
    b. Blue light moves faster than green light.
    c. All the colours of the white light move with the same speed.
    d. Yellow light moves with the mean speed as that of the red and the violet light.

    4. A : Astigmatism is a focussing error in two perpendicular lines. B : Stars twinkle due to refraction in fluctuating atmosphere.
    a. Both 'A' and 'B' are true statements
    b. Both 'A' and 'B' are false statements.
    c. A' is true while 'B' is false.
    d. A' is false while 'B' is true

    5. Having two eyes facilitates in A : Increasing the field of view B : Bringing three dimensional view C : Developing the concept of distance/size Then the correct option is/are
    a. A only
    b. A and B only
    c. B only
    d. A, B and C

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    6. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset ?
    a. Dispersion of light
    b. Scattering of light
    c. Total internal reflection of light
    d. Reflection of light from the earth

    7. Which of the following figures correctly represents the passage of white light through prism?

    8. The image on retina remains for
    a. 20s
    b. 10s
    c. 1/10s
    d. 1/20s

    9. When a graph is plotted taking angle of deviation along the y axis and angle of incidence along the x axis, which of the following figures correctly represents this variation?

    10. When Newton’s color disc is rotated fast, the different colours
    a. Can be separated
    b. Can be differentiated
    c. Cannot be differentiated
    d. None of these

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    11. Figure a,b, c respectively, indicate the point in case of

    a. The normal eye, the hypermetropic eye and myopic eye
    b. The hypermetropic eye, the myopic eye and normal eye
    c. The normal eye, the myopic eye and hypermetropic eye
    d. The myopic eye, the normal eye and hypermetropic eye

    12. The property of persistence of vision is used in-
    a. Short sightedness
    b. Long sightedness
    c. Cinematography   
    d. Colour vision

    13. Two thin lenses of power +5D and -2D are put in contact with each other. Focal length of the combination is
    a. +3m
    b. -3m
    c. 0.33m
    d. -0.33m

    14. The angle between two plane refracting surfaces of prism is called angle of
    a. Prism
    b. Emergence
    c. Deviation
    d. Incidence

    15. In which of the following cases will no dispersion take place when sunlight passes through it?

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