CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 4 - MCQExams.com

Which of the following statements is correct?
  • A person with myopia can see nearby objects clearly
  • A person with hypermetropia can see nearby objects clearly
  • A person with myopia can see distant objects clearly
  • A person with hypermetropia cannot see distant objects clearly
Accommodation means the adjustment of light going into the eye for image formation. 
  • True
  • False
If there had been one eye of the man, then 
  • Image of the object would have been inverted
  • Visible region would have decreased
  • Image would not be three dimensional
  • (b) and (c) both
The sensation of vision in the retina is carries to the brain by 
  • Ciliary muscle
  • Blind spot
  • Cylindrical lens
  • Optic nerve
If the distance of the far point for a myopia patient is doubled, the focal length of the lens required to cure it will become 
  • Half
  • Double
  • The same but a convex lens
  • The same but a concave lens
The far point of the myopic eye is $$250\ cm$$, then the focal length of the lens to be used will be 
  • $$-250\ cm$$
  • $$-250/9\ cm$$
  • $$+250\ cm$$
  • $$+250/9\ cm$$
When the power of eye lens increases, the defect of vision is produced. This  defect of vision is known as 
  • Shortsightedness
  • Longsightedness
  • Colourblindness
  • None of the above
A student can distinctly see the object upto a distance $$15\ cm$$. He wants to see the black board at a distance of $$3\ m$$. Focal length and power of lens used respectively will be 
  • $$-4.8\ cm, -3.3\ D$$
  • $$-5.8\ cm, -4.3\ D$$
  • $$-7.5\ cm, -6.3\ D$$
  • $$-15.8\ cm, -6.3\ D$$
A person can see clearly objects between 15 and 100 cm from his eye. The range of his vision if he wears close fitting spectacles having a power of 0.8 diopter is :
  •  5 to 500 cm
  •  12 to 250 cm
  •  17 to 500 cm
  •  17 to 250 cm
A beam of light composed of red and green rays is incident obliquely at a point on the face of a rectangular glass slab. When coming out on the opposite parallel face, the red and green rays emerge from :-
  • Two points propagating in two different parallel directions
  • One point propagating in two different directions through slab
  • One point propagating in the same direction through slab
  • Two points propagating in two different non parallel directions
A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his textbook. Which of the following statements is correct?
  • The near point of his eyes has receded away.
  • The near point of his eyes has come closer to him.
  • The far point of his eyes has come closer to him.
  • The far point of his eyes has receded away.
At noon the sun appears white because:
  • light is least scattered.
  • all the colours of the white light are scattered away.
  • blue colour is scattered the most.
  • red colour is scattered the most.
A short-sighted person can see objects most distinctly at a distance of $$16 cm$$. If he wears spectacles at a distance of $$1 cm$$ from the eye, then their focal length to see at a distance of $$26 cm$$ distinctly is 
  • $$25cm, convex$$
  • $$25 cm, concave$$
  • $$37.5 cm, convex$$
  • $$37.5 cm, concave$$
The near point and the far point of a child are at $$10\ cm$$ and $$100\ cm$$ respectively. If the retina is $$2\ cm$$ behind the eye lens, the range of the power of the eye lens is:
  • $$40\ D$$ to $$20\ D$$
  • $$60\ D$$ to $$51\ D$$
  • $$35\ D$$ to $$22\ D$$
  • $$55\ D$$ to $$25\ D$$
The power of a lens used to remove the myopic defect of an eye is 0.66 D. The far point for this eye is (nearly) :
  • $$25\ cm$$
  • $$150\ cm$$
  • $$100\ cm$$
  • $$75\ cm$$
A person can see clearly objects lying between $$25\ cm$$ and $$2\ m$$ from his eye. His vision can be corrected by using spectacles of power:
  • $$+0.25\ D$$
  • $$+0.5\ D$$
  • $$-0.25\ D$$
  • $$-0.5\ D$$
Match the elements of table I and II.
Table ITable II
a) Myopiai) Bifocal len
b) Hypermetropiaii) Cylindrical lens
c) Presbyopiaiii) Concave lens
d) Astigmationiv) Convex lens
  • a - iii, b - iv, c- i, d -ii
  • a - iv, b - iii, c -i, d - ii
  • a - i, b - ii, c - iii, d - iv
  • a - ii, b - iv, c -i, d - iii
A person wears glasses of power $$-2.0\ D$$. The defect of the eye and the far point of the person without the glasses will be 
  • Nearsighted, 50 cm
  • Farsighted, 50cm
  • Nearsighted, 250 cm
  • Astigmatism, 50 m
The near point of a person is 50cm and the far point is 1.5m. The spectacles required for reading purpose and for seeing distant objects are respectively:
  • $$+2D$$,   $$-\dfrac{2}{3}$$D
  • +$$\dfrac{2}{3}$$D,   $$-2D$$
  • $$-2D$$,  +$$\dfrac{2}{3}$$D
  • $$-\dfrac{2}{3}$$D,   $$2D$$
A defective eye cannot see close objects clearly because their image is formed:
  • On the eye lens
  • Between eye lens and retina
  • On the retina
  • Beyond retina
 A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?
  • (i)
  • (ii)
  • (iii)
  • (iv)
The clear sky appears blue because:
  • blue light gets absorbed in the atmosphere.
  • ultraviolet radiations are absorbed in the atmosphere.
  • violet and blue lights get scattered more than lights of all other colours by the atmosphere.
  • light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.
Which of the following statements is correct regarding the propagation of light of different colors of white light in air?
  • Red light moves fastest
  • Blue light moves faster than green light
  • All the colours of the white light move with the same speed
  • Yellow light moves with the mean speed as that of the red and the violet light
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:
  • is scattered the most by smoke or fog.
  • is scattered the least by smoke or fog.
  • is absorbed the most by smoke or fog.
  • moves fastest in air.
Why is the colour of the clear sky blue?
  • Blue colour gets scattered the maximum.
  • water of sea is blue.
  • Blue colour gets scattered the minimum.
  • none of these.
A person needs a lens of power -4.5 D for correction of her vision. What kind of defect in vision is she suffering from?
  • Myopia
  • Ptosis
  • Presbyopia
  • Diplopia.
How will you use two identical prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? 
  • Just put them side by side.
  • one placed on top of the other .
  • one placed inverted with respect to the other.
  • none of these.
When do we consider a person to be myopic?
  • He has poor near vision or blurred vision at all distances
  • He can not identify colors
  • He has poor night vision
  • He can see fine upto close distance, but distant objects are a blur
The focal length of the eye lens increases when eye muscles:
  • are relaxed and lens becomes thinner.
  • contract and lens becomes thicker.
  • are relaxed and lens becomes thicker.
  • contract and lens becomes thinner.
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
  • Dispersion of light
  • Scattering of light
  • Total internal reflection of light
  • Reflection of light from the earth
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