CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 3 - MCQExams.com

The impression of an image does not vanish immediately from the retina. It persists there for about $$1/16^{th}$$ of a second.
  • True
  • False
The least distance of distinct vision for a normal person is about :
  • 1 m
    1m1m
  • $$0.5\;m$$
  • $$0.25\;m$$
  • $$25 \ m$$
The near point of a myopic eye is $$15$$ cm. What should be the power of the lens which will enable the eye to read a book placed at $$30$$ cm?
  • $$3.33$$ dioptre
  • $$-3.33$$ dioptre
  • $$2.22$$ dioptre
  • $$-2.22$$ dioptre
Why are school buses painted with yellow colour?
  • Because yellow colour make the vehicles look good
  • Our eyes are mostly sensitive to yellow colour
  • Our eyes are least sensitive to yellow colour
  • All are true
It is very difficult to see through fog because
  • of scattering of light
  • of total internal reflection
  • fog is good absorber of light
  • refractive index offog is very large
One cannot see through fog because .......... .
  • Fog absorbs light
  • Refractive index of fog is unity
  • Light suffers total internal reflection at the droplets in fog
  • Light is scattered by the droplets in fog
Motion pictures or cinematography make use of :
  • Least distance of distinct vision
  • Persistence of vision
  • Power of accommodation
  • None of these
Fine beam of light entering through a small hole in a dark room illuminates the particles in its path. Identify the effect associated with this process.
  • Schottky effect
  • Rutherford effect
  • Tyndall effect
  • Photoelectric effect
Lens of an eye is a transparent spherical structure which:
  • reflects light
  • scatters light
  • refracts light
  • diffracts light
Transparent front part of eye is:
  • pupil
  • cornea
  • iris
  • retina
The part of human eye which is sensitive to red, blue and green light is:
  • Retina
  • Lens
  • Cornea
  • Iris
What are the changes in ciliary muscle when nearby objects and distant objects are viewed?
  • When objects near the eyes are viewed,the ciliary muscles contract and while viewing distant objects ciliary muscles relax.
  • When objects near the eyes are viewed,the ciliary muscles relax and while viewing distant objects ciliary muscles contract.
  • Cilliary muscle is not related to the functioning of the lens and provides mechanical support only.
  • Ciliary muscles contract or relax depending on the intensity of the light and not hte distance of the object. 
Aqueous humour is a _________ and  vitreous humour is a _________.
  • Transparent jelly, viscousfluid
  • Transparent jelly, watery fluid
  • Viscous fluid, viscous fluid
  • Viscous fluid, transparent jelly
Shape of eye ball is:
  • Flat
  • Spherical
  • Oval
  • Fish shaped
Which part of eye is responsible for its characteristic colour
  • Pupil
  • Iris
  • Cornea
  • Sclera
The power of accommodation is achieved by by changing:
  • curvature of eye lens
  • focal length of eye lens
  • both A and B
  • neither A nor B
Variable focal length of eye is responsible for:
  • accommodation of eye
  • persistence of vision
  • colour blindness
  • least distance of distinct vision
Image forming light sensitive screen of the eye is known as __________ and it contains __________.
  • iris, blind spot
  • cornea, blind spot
  • retina, photoreceptors
  • cornea, photoreceptors
What is the function of aqueous humour?
  • Helps in transmitting impulses to the brain
  • Protect the eyeball from collapsing
  • Keeps the cornea moist and give definite shape to the eyeball
  • All
Which of the following statement is correct?
  • Vitreous fluid helps to maintain the shape of the retina
  • Crystalline eye lens helps in focusing the image
  • Aqueous humour helps to maintain the pressure in the eye
  • All of the above
A glass prism has how many rectangular surfaces?
  • $$3$$
  • $$4$$
  • $$2$$
  • $$1$$
The path of a ray of light passing through a glass prism is shown below :
In this diagram the angle of prism, angle of incidence, angle of emergence and angle of deviation respectively have been represented by:
494526.JPG
  • O, Y, Z and N,
  • P, Y, M and Z,
  • O, X, M and Z
  • P, X, Z and N
A person cannot see objects clearly beyond 50cm. The power of lens to correct the vision is
  • +5D
  • -2D
  • -0.5D
  • +2D
Red and blue beams of light is incident on a prism as shown in the figure. Which of the following statements is true?

488278_4bf8753435aa4864b82ddb19f67c0a2b.png
  • The blue light bends more than the red light as the blue light has a longer wavelength.
  • The red light bends more than the blue light as the red light has a longer wavelength.
  • The blue light bends more than the red light as the blue light has a shorter wavelength.
  • The red light bends more than the blue light as the red light has a shorter wavelength.
  • The red and blue lights bend by the same amount as all colors of light refract equally.
The human eye forms the image of an object at its :
  • cornea
  • iris
  • pupil
  • retina
Which of the following lens is used to correct myopia?
  • Convex lens
  • Concave lens
  • Cylindrical lens
  • None of these
Due to which phenomena the combination of red, green and blue forms the same white colour
  • Due to persistence of vision
  • Due to reflection
  • Due to refraction
  • Due to deviation
The change in focal length of an eye lens is caused by the action of
  • pupil
  • retina
  • ciliary muscles
  • iris
A parallel beam of light falling on the eye gets focused on the retina because of refraction at
  • The cornea
  • The crystalline lens
  • The vitreous humor
  • Various surfaces in the eye
The power of accommodation for the normal eye is
  • 4 D
  • 40 D
  • 44 D
  • 400 D
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