CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 5 - MCQExams.com

The bluish colour of water in deep sea is due to:
  • the presence of algae and other plants found in water.
  • reflection of sky in water.
  • scattering of light.
  • absorption of light by the sea.
Which of the following statement is correct?
  • A person with myopia can see distant objects clearly
  • A person with hypermetropia can see nearby objects clearly
  • A person with myopia can see nearby objects clearly
  • A person with hypermetropia cannot see distant objects clearly
A student sitting at the back of the classroom cannot read clearly the letters written on the blackboard. What advice will a doctor give to her?
  • Doctor advises her to use a convex lens of appropriate power.
  • Doctor advises her to use a concave lens of appropriate power.
  • Doctor advises her to use a plane mirror of appropriate power.
  • Doctor advises her to use a plano convex lens of appropriate power.
What kind of defect in vision is she suffering from?
  • Myopia
  • Hypermetropia
  • Astigmatism
  • None of these
Match the entries in Column I with those in Column II correctly.
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  • i - s, ii - r, iii - q, iv - p
  • i - q, ii - s, iii - p, iv - r
  • i - r, ii - p, iii - s, iv - q
  • i - q, ii - r, iii - s, iv - p
Why does the pupil of a human eye appear black?
  • No light gets refracted from it.
  • No light gets dispersed from it.
  • No light gets scattered from it.
  • No light is reflected from it.
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
  • presbyopia
  • accomodation
  • near-sightedness
  • far-sightedness
How can we explain the reddish appearance of sun at sunrise or sunset? 
  • Scattering of blue light is more than the scattering of red light
  • Scattering of red light is more than the scattering of blue light
  • Intensity of sun reduces during sunrise and sunset
  • Due to the view angle, it appears blue
If the far point of an eye is at 4 m, then identify the defect of the eye and the lens needed to correct this.
  • Hypermetropic and needs 1.25 D lens.
  • Hypermetropic and needs +2.5 D lens.
  • Myopic and needs +0.25 D lens.
  • Myopic and needs 0.25 D lens.
Which of the following is a natural phenomenon that shows dispersion of light?
  • Rainbow
  • Tsunami
  • Thunder
  • Lightning
For a normal unaided eye the least converging power of the eye lens behind the cornea is 20D and the cornea itself has some converging power. The distance between the retina and the cornea-eye lens can be approximated to 5/3cm. Converging power of the cornea is give by:
  • 2.5D
  • 40D
  • 60D
  • 19.4D
Which of these options is correct?
  • During noon the scattering of sunlight is maximum
  • Magnified images cannot be formed by concave lenses
  • Images formed by convex lenses are always virtual
  • A diamond absorbs most of the light falling on it
A light ray of a single wavelength is incident on the prism. The emergent light is best described by a:
  • spectrum of component colours.
  • laterally shifted ray of same wavelength.
  • light ray of same wavelength deviated by an angle.
  • light ray of different wavelength deviated by an angle.
Identify the effects produced by the scattering of sunlight by the earths atmosphere.

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  • Only (i) and (ii)
  • Only (ii) and (iii)
  • Only (i) and (iii)
  • (i), (ii) and (iii)
If the image of distant objects is formed in front of the retina, the defect of vision may be:
  • Myopia
  • Hypermetropia
  • Cataract
  • Astigmatism
The power of accommodation for the normal eye is:
  • 40 D
  • 0.4 D
  • 4 D
  • 44 D
Analyse the given statements and choose the correct option. 
Statement 1 : When a ray of light passes through a prism, it bends towards the thicker part of the prism.
Statement 2 : An incident ray strikes a prism, undergoes refraction and comes out as emergent ray.
  • Both statement 1 and statement 2 are CORRECT and statement 2 is the CORRECT explanation of the statement 1.
  • Both statement 1 and statement 2 are CORRECT, but statement 2 is NOT THE CORRECT explanation of the statement 1.
  • Statement 1 is CORRECT, but statement 2 is INCORRECT.
  • Statement 1 is INCORRECT, but statement 2 is CORRECT.
A person is suffering from myopia. Then :
  • he can not see anything.
  • he cannot see distant objects clearly.
  • he can see only distant objects.
  • he can not see nearly objects.
Which of the following options correctly describe respective image?
  • A short-sighted eye corrected by a convex lens.
  • A short sighted eye corrected by concave lens.
  • A healthy eye.
  • A short sighted eye corrected by convex lens.
Which of the following lens is used to correct hypermetropia?
  • Convex lens
  • Concave lens
  • Cylindrical lens
  • None of these
A mirage takes place due to..........
  • Reflection
  • Refraction
  • Total internal reflection
  • Both (2) and (3)
One cannot see through fog because:
  • fog absorbs light
  • light is scattered away by the droplets in fog
  • light suffers total internal reflection at the droplets in fog
  • the refractive index of fog is infinity
Long-sightedness is caused by the eyeball being too short. It can be corrected by the use of a:
  • convergent lens
  • plane mirror
  • divergent lens
  • None of these
The formation of mirage is due to :
  • Reflection
  • Refraction
  • Dispersion
  • Total internal reflection
A mirage occurs because :
  • the hot ground acts like a mirror
  • the refractive index of atmosphere decreases with height
  • the refractive index of atmosphere increases with height
  • the refractive index remains constant with height
A man wear glasses of focal length $$f=+1\ m.$$
  • If he is far-sighted
  • If he is near-sighted
  • If his vision is normal
  • None of these
In case of hypemetropia
  • The image of near objects is formed in front of retina
  • The image of near objects is formed behind the retina
  • A concave lens should be used for correction
  • A convex lens cannot be used for correction
Why are red coloured lights are used in traffic signals to stop the vehicles?
  • minimum wavelength and less scatter.
  • maximum wavelength and more scatter.
  • maximum wavelength and less scatter.
  • less wavelength and less scatter.
Clouds are white because of light scattering off of water droplets.
  • True
  • False
A professor reads a greeting card on his $$50th$$ birthday with $$+2.5D$$ glasses keeping the card $$25\ cm$$ away. $$10$$ years later he reads the greeting card with the same glasses keeping the card $$50\ cm$$ away. What power should he wear now?
  • $$2\ D$$
  • $$0.5\ D$$
  • $$2.25\ D$$
  • $$4.5\ D$$
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