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CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 12 - MCQExams.com

The spread in colours in a rainbow on sky is primarily due to
  • Dispersion of sunlight
  • Reflection of sunlight
  • Refraction of sunlight
  • Total internal reflection of sunlight
Far point of a person is 5m. In order that he has normal vision what kind of spectacles should be use
  • Concave lens with focal length 5m
  • Concave lens with focal length 10m
  • Convex lens with focal length 5m
  • Convex lens with focal length 2.5m
When objects at different distances are seen by the eye which of the following remain constant?
  • Focal length of eye-lens
  • Object distance from eye-lens
  • The radii of curvature of eye-lens
  • Image distance from eye-lens
Very fine particles mainly scatter _______ coloured light.
  • Red
  • Blue
  • Green
  • Yellow
The least distance of distinct vision is ________.
  • 25 m
  • 340 cm
  • 25 cm
  • 17 cm
The hypermetropia is a
  • short sighted defect
  • long sighted defect
  • bad vision due to old age
  • none of these
The defect hypermetropia can be corrected by using a ..................
  • Convex lens
  • Concave lens
  • Concave mirror
  • Convex mirror
Choose the correct alternative which matches second and third column .
Column I
Column II
Column III
I. Thickening of eye lens
A. Focal length increases
i. Ciliary muscles contract
II. Thining of eye lens.
B. Focal length decreases
ii. Ciliary muscles elongate
  • (I)- (B)- (i), (II)-(A)-(ii)
  • (I)-(B)-(ii), (II)-(A)-(i)
  • (I)-(A)-(i), (II)-(B)-(ii)
  • (I)-(A)-(ii), (II)-(B)-(i)
As the thickness of the atmosphere increases the color of scattered light is found in ________ order.
  • Blue, violet, yellow, red
  • Violet, blue, yellow, red
  • Red, yellow, blue, violet
  • Violet, blue, red, yellow
Which coloured light scatters least by fog and smoke?
  • Green
  • Yellow
  • Blue
  • Red
At which place in the eye, image is formed of a person is far-sightedness (hypermetropia)?
  • On retina
  • Behind the retina
  • Infront of retina
  • On lens of eye
Which is true for the far sightedness or hypermetorpia from the following?
  • Eye lens does not become thin as per requirement
  • Distant object cannot be seen clearly
  • Nearby object cannot be seen clearly
  • Defect can be corrected by using concave lens
Which colour of light is scattered the most (maximum) in the atmosphere?
  • Red
  • Yellow
  • Blue
  • Green
The lens used to correct long sightedness or hypermetropla.
  • Convex lens
  • Concave lens
  • Simple lens
  • Cylindrical lens
What is the least distance of distinct vision of a normal human eye?
  • 10 cm
  • 100 cm
  • 25 cm
  • 25 m
In the dispersion of white light from a prism, the violet light is deviated more than the red light because :
  • Velocity of violet rays of light is more
  • Wavelength of violet rays of light is more
  • The frequency of violet rays of light is more
  • The refractive index of prism for violet rays of light is more
How many times do the components of white light undergo deviation while passing through the prism ?
  • Once
  • Twice
  • Thrice
  • Never
In spectrum obtained with prism which color is deviated maximum ?
  • Violet
  • Red
  • Green
  • Orange
A person near point of vision is 100cm. Then, the power of lens he must wear so as to have normal vision is :
  • 3D
  • +3D
  • 1D
  • +1D
Why do we study the Dispersion phenomenon using a glass prism and not a glass slab ?
  • Light doesn't undergo any deviation inside a glass slab; so cannot be used to study Dispersion
  • All of the dispersion that takes place at the first interface is exactly reversed at the second parallel surface, 'undoing' the effect of the first interface.
  • Dispersion occurs only in prism and not in glass slab
  • None of the above
Dispersion of light is caused due to :
  • intensity of light
  • density of medium
  • wavelength
  • none of the above
For the myopic eye, the defect is cured by
  • Convex lens
  • Concave lens
  • Cylindrical lens
  • Toric lens
A person can see objects clearly only upto a maximum distance of 60 cm. His eye defect, nature of the corrective lens and its focal length are respectively.
  • Myopia, convex, 60 cm
  • Myopia, concave, 60 cm
  • Hypermetropia, concave, 60 cm
  • Contract, convex, 60 cm
A far-sighted person has his near point 50 cm, find the power of lens he should use to see at 25 cm, clearly.
  • +1D
  • +2D
  • 2D
  • 1D
To read a poster on a wall, a person with defective vision needs to stand at a distance of 0.4m from the poster. A person with normal vision can read the poster from a distance of 2.0m. Which one of the following lens may be used to correct the defective vision?
  • A concave lens of 0.5D
  • A concave lens of 1.0D
  • A concave lens of 2.0D
  • A convex lens of 2.0D
Rainbow is produced when sunlight falls on drops of rain, Which of the following physical phenomena are responsible for this? 
  • Diffusion
  • Dispersion and total internal reflection
  • Only refraction
  • Diffusion, refraction and total internal reflection
If the power of an eye lens increases, then the defect of vision so produced is known as
  • Colour blindness
  • Long sightedness
  • Short sightedness
  • None of the above
The middle vascular coat that darkens the eye chamber and prevents refraction by absorbing the light rays is
  • Choroid
  • Sclera
  • Retina
  • Cornea.
A mirage is observed when
  • Density of air decreases with increase of height
  • Density of air increases with increase of height
  • Refractive index of air decreases with increase of height
  • The Earth acts like a mirror.
Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena is/are responsible for this?
  • Diffusion
  • Dispersion and refraction
  • Only refraction
  • Refraction, dispersion and total internal reflection.
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