CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 8 - MCQExams.com

A person can see clearly up to 3 metres what should be the power of the lens in his spectacles so that he could see clearly up to 12 metres.
  • 0.25 D
  • -0.25 D
  • 0.5 D
  • - 0.75 D
A child was prescribed the following lenses for his spectacles by the optician:Left eye: + 2.50D, Right eye: +1.25D .The child has a defect of vision called:
  • Presbyopia
  • Myopia
  • Hypermetropia
  • Astigmatism
If the optician's prescription for the spectacles reads: Left eye: -3.00 D, Right eye: -3.5 D then the person is suffering from the defect of vision called:
  • Astigmatism
  • Myopia
  • Presbyopia
  • Hypermetropia
At sun rise or at sun set the sun appears to be reddish while at mid day it looks white. This is because
  • Scattering due to dust particles and air molecules causes this phenomenon
  • The sun is cooler at sun rise or at sunset
  • Refraction causes this phenomenon
  • Diffraction sends red rays to the earth at these times
A person cannot see objects clearly which are nearer than 75 cms from his eyes, the disease he is suffering from is:
  • Astigmatism
  • Myopia
  • Hypermetopia
  • Presbyopia
Long-sightedness is to hypermetropia as short-sightedness is to :
  • myopia
  • focusing
  • astigmatism
  • accomodation
Figure (a), (b), and (c) respectively, indicate the point of focus in case of :
369648_6f6772b65d5f4f4ebd85c0fa90b2c2e5.png
  • The normal eye, the hypermetropic eye and myopic eye
  • The hypermetropic eye, the mypoic eye and the normal eye
  • The normal eye, the myopic eye and the hypermetropic eye
  • The myopic eye, the normal eye and the hypermetropic eye
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
  • concave mirror
Hypermetropia is due to the ________ of the eye.
  • low converging power
  • low diverging power
  • high converging power
  • high diverging power
Identify the correct statement from the following
  • The setting sun appears higher in the sky than that of glass
  • In glass, red light travels faster than violet light
  • The refractive index of diamond is greater than that of glass
  • Refractive index of a material is greater for red light than that of violet light.
A person cannot see the objects clearly placed at distance more than $$40\ cm$$. He is advised to use lens of power:
  • $$-2.5\ D$$
  • $$+2.5\ D$$
  • $$-6.25\ D$$
  • $$+1.5\ D$$
Reflection of the sunlight from the upper layers of the Earth's atmosphere causes
  • days and nights
  • tides
  • eclipses
  • twilight
A near sighted person cannot see distinctly beyond $$50   cm$$ from his eye. The power in diopter of spectacle lenses which will enable him to see distant objects clearly is:
  • +50 D
  • -50 D
  • +2 D
  • -2 D
Figures (a), (b), (c) and (d) respectively correspond to 
369632_25e33fe7c53b46d28feb68538da4c4cc.png
  • The short-sighted eye, the correction of long-sight, the long-sighted eye and the correction of short-sight
  • The short-sighted eye, the correction of short-sight, the long-sighted eye and the correction of long-sight
  • The long-sighted eye, correction of short-sight, the short-sighted eye and the correction of long-sight
  • The long-sighted eye, the correction of long-sight, the long-sighted eye and the correction of short-sight
The figure above shows the eye suffering from :
369938_d4c1e4cac0494731b28df81fa1dc2364.jpg
  • hypermetropia
  • myopia
  • astigmatism
  • short-sightedness
Which of the following lens is used to minimise hypermetropia ?
  • Convex lens
  • Concave lens
  • Cylindrical lens
  • Planar lens
The film of camera is compared to which part of human eye?
  • Lens
  • Retina
  • Iris
  • Choroid
The sky is blue because
  • There is more blue light in the sunlight
  • Of scattering of sunlight by air molecules in the atmosphere
  • Of scattering of sunlight by dust particles in the atmosphere
  • Other colours are absorbed by heavenly bodies
Which of the following colour of light undergoes the maximum deviation while passing a glass prism?
  • Red
  • Blue
  • Violet
  • Green
The angle between the original path of the incident ray and the emergent ray coming out of a prism is called angle of
  • incidence
  • reflection
  • prism
  • deviation
At sunrise or sunset, the sun appears to be reddish white. This is because :
  • The sun is colder at sunrise or at sunset
  • Diffraction sends red rays to the earth at these times
  • Refraction causes this phenomenon
  • Scattering due to dust particles and air molecules causes the phenomenon
  • None of these
The figure above shows the eye suffering from :
369948_badaff3cd80b41cfbf72cf9457172f25.png
  • hypermetropia
  • myopia
  • astigmatism
  • far-sightedness
In hypermetropia, the image of near object is formed :
  • Before the retina
  • On retina
  • Behind the retina
  • Above the retina
The earth's atmosphere is transparent for the visible light.
  • True
  • False
Which of the following lens is used to minimise myopia ?
  • Convex lens
  • Concave lens
  • Cylindrical lens
  • Planar lens
Mirages are observed in deserts due to the phenomenon of
  • Interference of light and reflection of light
  • Total internal reflection of light and refraction of light
  • Scattering of light and dispersion of light
  • Double refraction of light
Angle of deviation is between :
  • Real and virtual image
  • Incident and emergent ray
  • Plane of reflection and plane of incidence
  • None of the above
Which of the following is not a characteristics of a concave lens?
  • Thick at the edges and thin in the middle.
  • Used to correct shortsightedness
  • A diverging lens
  • Used to correct longsightedness
In myopia, the image of distant object is formed :
  • Before the retina
  • On the retina
  • Behind the retina
  • Above the retina
The least distance of distinct vision for a defective eye is $$75$$ cm. What should be the focal length of the lens which will be used to read a book clearly at $$25$$ cm?
  • $$75\ cm$$
  • $$25\ cm$$
  • $$37.5\ cm$$
  • $$150\ cm$$
0:0:1


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