CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 7 - MCQExams.com

The speed at which the light travels in vacuum is:
  • $$3\times {10}^{6}m/s$$
  • $$3\times {10}^{8}m/s$$
  • $$3\times {10}^{10}m/s$$
  • $$3\times {10}^{12}m/s$$
Which of the following is not an advantage of having two eyes?
  • It gives a wider field of view.
  • The ability to detect faint objects is enhanced with two detectors instead of one.
  • It gives the ability to interpret the closeness of an object.
  • It gives the eye higher protection from dust and pollution.
A student has difficulty in reading the blackboard while sitting in the last row. From the given options, choose the defect child is suffering from and its correction measures :
  • Defect: Myopia
    Correction: Concave lens of suitable focal length
  • Defect: Hypermetropia
    Correction: Convex lens of suitable focal length
  • Defect: Myopia
    Correction: Medicines
  • Defect: Hypermetropia
    Correction: Medicines
Which of the following figures correctly represents the passage of white light through a prism ?
Sometimes, a person suffers from both the defects, myopia and hypermetropia. Which of the following is used to correct this defect?
  • Convex lens
  • Concave lens
  • Bifocal lens
  • Cylindrical lens
Identify the defect in the eye shown in the figure.
283860.png
  • Hypermetropia
  • Myopia
  • Astigmatism
  • Night blindness
While a white light ray, passes through a glass prism, the colour which deviates the least is:
  • violet
  • red
  • orange
  • None of these
The figure illustrates correction of vision for a certain defect of human eye. Identify the defect which is corrected here.

283868_605191ae74004c5eaa12adb44b5a47fe.png
  • Myopia
  • Hypermetropia
  • Astigmatism
  • Nigh Blindness
Identify the defect which is corrected in the attached figure.
283865.png
  • Hypermetropia
  • Myopia
  • Astigmatism
  • Night Blindness
The human eye can focus objects at different distances by adjusting the focal length of the eye.
This is due to:
  • Presbyopia
  • Accommodation
  • Near-sightedness
  • Far-sightedness
A vision problem that happens when light is focussed in front of the retina is:
  • Nearsightedness
  • Farsightedness
  • Colour deficiency
  • None of these
The eyeball is approximately  spherical in shape. What is the diameter of a normal human eyeball?
  • Approximately 2.3 cm
  • Approximately 4.3 cm
  • Approximately 5.3 cm
  • None of the above 
A person who is nearsighted will have the most trouble in reading:
  • A computer screen in front of him or her
  • A book in his or her hands
  • A street sign across the street
  • The title of a pamphlet on a nearby table
Mirages are observed in atmosphere due to the phenomenon of:
  • interference of light
  • total internal reflection of light
  • scattering of light
  • double refraction of light
A man cannot see objects distinctly at a distance less than 1 metre. He is suffering from 
  • Old age sight
  • Short-sightedness
  • Long-sightedness
  • Opaqueness of the lens
Fill in the blanks:
The power of accommodation in a human eye is the ability of the (i)____ to adjust its (ii)___.
  • (i) pupil 
    (ii) weight
  • (i) eye lens 
    (ii) focal length
  • (i) retina
    (ii) focal length
  • (i) lens 
    (ii) distance from the retina
A person suffering from myopia (short-sightedness) can see clearly only up to a distance of 2m.What is the power of concave lens required to rectify this defect?
  • $$-0.5 D$$
  • $$-1.5 D$$
  • $$-2.0 D$$
  • $$-2.5D$$
White light is split into a spectrum by a prism and it is seen on a screen. If we put another identical inverted prism behind it in contact, what will be seen on the screen?
  • Violet will appear where red was
  • The spectrum will remain the same
  • There will be no spectrum, but only the original light with no deviation
  • There will be no spectrum, but the original light will be laterally displaced

If a person cannot see an object clearly when it is placed at about 25 cm away from him, he is suffering from:

  • Mypoia
  • Hypermetropia
  • Astigmatism
  • Presbyopia
  • None of these
The size of the pupil is controlled by the iris.
  • True
  • False
Fill in the blanks:
An aged person suffering from __________, caused by the weak accommodation power of the eye lens associated with old age, should wear _________ lenses.

  • Myopia, concave 
  • Hypermetropia, convex
  • Presbyopia, bifocal
  • Astigmastism, cylindrical
Rainbow is a natural phenomenon showing dispersion of light. 
  • True
  • False
Which one of the following statements is correct?
  • The planets twinkle at night due to atmospheric refraction of light
  • The stars appear higher in the sky than they actually are, due to scattering of light
  • The blue colour of sky is due to scattering of light
  • The rainbow is produced by the reflection of white sunlight by water drops in the atmosphere.
Which of the following phenomena cannot be explained by scattering of light ?
  • Blue colour of sky
  •  Colour of clouds
  • Tyndall effect
  • Formation of rainbow
The near point of a long sighted person is 40 cm from the eye. To read a book held at a distance of 25 cm, he will need spectacles containing 
  • Chromatic lenses
  • Prismatic lenses
  • Concave lenses
  • Convex lenses
A man can read the number of a distant bus clearly but is not able to read a book clearly. Which defect of the eye is he suffering from?
  • Myopia
  • Hypermetropia
  • Cataract
  • Astigmatism
The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect?
  • + 1.0D
  • -1.0D
  • +3.0D
  • -3.0D
Refraction of light in the eye occurs at
  • The pupil only
  • The cornea only
  • The lens only
  • Both the cornea and the lens
A person is not able to see nearby objects clearly. His vision can be corrected with the help of spectacles containing:
  • Converging lenses
  • Diverging lenses
  • Plane lenses
  • Prismatic lenses
The defect of vision which cannot be corrected with the help of spectacles is:
  • Cataract
  • Presbyopia
  • Myopia
  • Hypermetropia
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