CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 13 - MCQExams.com

A long-sighted person cannot see objects clearly at a distance less than $$40\ cm$$ from his eye. The power of the lens needed to read an object at $$25\ cm$$ is
  • $$-2.5 D$$
  • $$+2.5 D$$
  • $$-6.25 D$$
  • $$+1.5 D.$$
The sky appears blue, due
  • To scattering of light by dust particles
  • To the colour of the sea water
  • To the presence of water in clouds
  • None of these
Which of the following statements is correct about rainbow?
  • In primary rainbow, red colour on the outside and violet colour on the inside.
  • In primary rainbow, violet colour on the outside and red colour on the inside.
  • Secondary rainbow is brighter than primary rainbow.
  • In secondary rainbow, light waves suffers one total internal reflection before coming out.
The nearer point of hypermetropic eye is 40 cm. The lens to be used for its correction should have the power?
  • + 1.5 D
  • - 1.5 D
  • + 2.5 D
  • + 0.5 D
In the given figure, if P is a point of the source of light, R is retina and L is the lens of the eye, the person having such condition of his eyes is suffering from :
930167_bdf5469619904999b48aa83223e45682.png
  • Hypermetropia
  • Myopia
  • Cataract
  • Night Blindness
Which of the following statements is correct concerning the passage of white light into a glass prism?
  • All the colours of white light travel with the same speed
  • The violet colour travels slower than the red colour
  • The violet colour travels faster than the red colour
  • Greater the wavelength, slower the speed of colour
Of the following natural phenomena, tell which one is based on the refraction of light:
  • Earthlight
  • Polar light
  • Rainbow
  • Lightning
A ray of light containing both red and blue colours is incident on the refracting surface of a prism. Then,
  • both colours suffer equal deviation
  • red colour suffers more deviation
  • red colour suffers less deviation
  • deviation depends on the angle of prism
A person cannot see object clearly that are closed that $$2m$$ and father than $$4m$$ . To correct the eye vision the person will use :
  • Bifocal lenses of power $$0.5D$$ and $$0.25D$$
  • Bifocal lenses of power $$0.25 D$$ and $$3.5D$$
  • Bifocal lenses of power $$0.5 D$$ and $$4.0 D$$
  • Bifocal lenses of power $$4.0 D$$ and $$0.5 D$$
A man wearing glasses of focal length + 1m cannot clearly see beyond 1 m
  • if he is farsighted
  • if he is nearsighted
  • if his vision is normal
  • in each of these cases.
To remove myopia (short-sightedness) a lens of power $$- 0.66D$$ is required. The distant point of the eye is approximate.
  • $$100\ cm$$
  • $$151.5\ cm$$ 
  • $$50\ cm$$ 
  • $$25\ cm$$ 
A man wearing glasses of power $$+2D$$, can read clearly a book placed at a distance of $$40\ cm$$, from the eye. The power of the lens required, so that he can read at $$25\ cm$$ from the eye is ?
  • $$+4.5\ D$$
  • $$+4.0\ D$$
  • $$+3.5\ D$$
  • $$+3.0\ D$$
In the figure below for no dispersion to take place, light rays must enter from _____ and emerge from _____.
1141967_5f312fc64e594955970fdcca410597a5.png
  • $$A_1 B_1, \ P_1 R_1$$
  • $$A_2 B_2, \ P_2 Q_2$$
  • $$A_1 B_1, \ Q_1 R_1$$
  • $$A_2 B_2, \ R_2 Q_2$$
A person cannot see the object beyond 200cm. The power of lens used to  correct the vision will be :
  • +0.5 D
  • +5D
  • -0.5D
  • -5D
An old person is able to see an object nearest to 1 m.What should be the power of lens required so that he can see an object placed at nearest distance of distinct vision?
  • 3D
  • 4D
  • 1/2D
  • 1/4D
A far-sighted person cannot focus distinctly objects closer than 120 cm. The lens that will permit him to read from a distance of 40 cm will have a focal length:
  • + 30 cm
  • - 30 cm
  • + 60 cm
  • - 60 cm
A person can not see the distant objects clearly (though he can see the nearby object clearly). He is suffering from the defect of vision called:
  • cataract
  • hypermetropia
  • myopia
  • presbyopia
A person cannot see distant objects clearly. his vision can be corrected by using the spectacle containing :
  • concave lenses
  • plane lenses
  • contact lenses
  • convex lenses
Rainbow is observed when the Sun is 
  • In any of these position
  • In front of the observer
  • Behind the observer
  • Vertically above the observer
A person can see clearly objects only when they lie between $$50$$cm and $$400$$cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be?
  • Convex, $$+2.25$$ dioptre
  • Concave, $$-0.25$$ dioptre
  • Concave, $$-0.2$$ dioptre
  • Convex, $$+0.15$$ dioptre
A young man has to hold a book at arm's length to be able to read it clearly. The defect of vision is: 
  • astigmatism
  • myopia
  • presbyopia
  • hypermetropia
Though a woman can see the distant objects clearly, she cannot see the nearby object clearly. She is suffering from the defect called :
  • Long-sight
  • Short-sight
  • Hind-sight
  • Mid-sight
What is the common phenomena of light between random wavering of flickering of objects seen through a turbulent stream of hot air, advance sunrise and delayed sunset and twinkling of stars?
  • Refraction
  • Reflection
  • Scattering
  • Atmospheric refraction
The near point and the far point of a child are at 10 and 100 cm. If the retina is 2.0 cm behind the eyelens  .What is the range of the power of the eye lens?
  • $$50 D \text { to } 40 \mathrm { D }$$
  • $$60 D \text { to } 51 \mathrm { D }$$
  • $$60 D \text { to } 54 \mathrm { D }$$
  • $$40 D \text { to } 50 \mathrm { D }$$
After looking the sun the colour of other things appears 
  • Black
  • White
  • Yellow
  • Red
A person suffering from short-sightedness can see clearly only upto a distance of 2 metres. Find the power of the lens required to correct his vision
  • -0.5 D
  • -1.5 D
  • +2.5 D
  • +1.5 D
The phenomenon of splitting of sunlight by a prism is called_________  and the color that deviates most is ______
  • Reflection,violet
  • Refraction,Red
  • Scattering,Yellow
  • Dispersion,violet
Hypermetropia is possible in.........
  • children
  • aged person's
  • high intensity fall on eye
  • low intensity fall on eye
A student of class $$  10,  $$ is not able to see clearly the black board question when seated at a distance of $$5  \mathrm{m}  $$ from the board,the defect he is suffering from is
  • Myopia
  • Hypermetropia
  • Presbyopia
  • Astigmatism
The principle section of a glass prism is isosceles triangle ABC with AB=AC, the face AC is silvered. A ray of light is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to the base. Angle of BAC of the prism is 
  • 30$$^{ \circ }$$
  • 36$$^{ \circ }$$
  • 18$$^{ \circ }$$
  • 72$$^{ \circ }$$
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