CBSE Questions for Class 10 Physics Human Eye And Colorful World Quiz 16 - MCQExams.com

Which of the following phenomena cannot be explained by scattering of light?
  • Blue colour of sky
  • White colour of clouds
  • Tyndall effect
  • Formation of rainbow
A person can see clearly objects between 15 and 100 cm from his eye. The range of his vision if he wears close fittings spectacles having a power of $$0.8$$ dipole is
  • $$5$$ to $$500cm$$
  • $$12$$ to $$250cm$$
  • $$17$$ to $$500cm$$
  • $$17$$ to $$250cm$$
Read the given statements and mark the correct option.
Statement 1 : Abeam of white light gives a spectrum on passing through a hollow prism.
Statement 2 : Speed of light outside the hollow prism is different from the speed of light inside the hollow prism.
  • Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
  • Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
  • Statement 1 is true but statement 2 is false.
  • Both statements 1 and 2 are false.
A large-angle prism deviates a light ray
  • more
  • less
  • equal to a small-angle prism
  • does not deviate at all
Ocean appears blue due to _____________________.
  • Greater depth
  • Scattering of light by water particles
  • Blue colour of water
  • None of these
Which defect of vision of eye is shown respectively?
947983_2d684267417a4ce68586a6dbfad6ed8c.png
  • P: Presbyopia, Q: Near sightedness
  • P: Far sightedness, Q: Near sightedness
  • P: Near sightedness, Q: Far sightedness
  • P: Presbyopia, Q: Far sightedness
In the experiment of prism incident red color ray instead of white light through a prism. Which color band will you observe on screen?
947959_35d79b9d712b47e8b4e4800b4887038f.png
  • Red colour spectrum
  • All the colours of rainbow
  • Maroon and yellow colour spectrum
  • White colour spectrum
Match the column I with column II and select the correct option from the codes given below. 
Column I Column II 
(a)Choroid (i)Detects light stimulus
(b)Retina (ii)Absorbs light and prevent it from being reflected within the eyeball
(c)Cornea (iii)Controls the size of the pupil
(d)Iris (iv)Helps to focus light as it enters the eye.
  • (a)-(ii). (b)-(i), (c)-(iv), (d)-(iii)
  • (a)-(i), (b)-(ii), (c)-(iii). (d)-(iv)
  • (a)-(ii). (b)-(iii), (c)-(iv), (d)-(i)
  • (a)-(iii), (b)-(iv), (c)-(i), (d)-(iii)
The near point of a person is $$75cm$$. In order that he may be able to read book at a distance $$25cm$$. The power of spectacles lenses should be
  • $$-2D$$
  • $$+3.75D$$
  • $$+2.6D$$
  • $$+3D$$
A far sighted man cannot focus distinctly on objects closer than $$1m$$. What is the power of the lens that will permit him to read from a distance of $$40 \,cm$$.
  • $$2.5 D$$
  • $$-2.5 D$$
  • $$1.5 D$$
  • $$1.67 D$$
Which phenomenon is responsible for the twinkling of stars?
  • Atmospheric reflection
  • Atmospheric refraction
  • Reflection
  • Total internal reflection
For a normal eye, the cornea of eye provides as converging power of 40 D and the lens least converging power of the eye lens behind the cornea is 20 D. Using this information , the distance between the retina and the cornea – eye lens can be estimated to be:
  • 1.5 cm
  • 5 cm
  • 2.5 cm
  • 1.67 cm
The near point of a hypermetropic person is 75 cm from the eye. What is the power of the lens required to enable the person to read clearly a book held at 25 cm from the eye?
  • $$1\ D$$
  • $$1.5\ D$$
  • $$0.75\ D$$
  • $$2.67\ D$$
What does the dispersion of light in a medium imply
i) Lights of different wavelength travel with different speeds in the medium.
ii) Light of any frequency will travel with the same speed in the medium
iii) The refractive index of the medium is different for different wavelength of light
  • $$(i)$$ and $$(ii)$$ only
  • $$(ii)$$ and $$(iii)$$ only
  • $$(i)$$ and $$(iii)$$ only
  • $$(i),(ii)$$ and $$(iii)$$
For an equilateral prism if :
$$\angle { i } = angle\ of\ Incidence$$
$$\angle { e } = angle\ of\ Emergence$$
$$\angle { P } = angle\ of\ Prism$$
$$\angle { D } = angle\ of\ Deviation$$
then which one relation is correct :
  • $$\angle i + \angle e$$ = $$\dfrac {\angle P + \angle D}{2}$$
  • $$\angle i + \angle D = \angle P + \angle e$$
  • $$\angle i + \angle e = \angle P + \angle D$$
  • $$None\ of these$$
After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles:
left eye : $$+ 2\, D$$ Right eye: $$+ 2.25\, D$$
the child is suffering from the defective vision called:
  • Short-sightedness
  • Long-sightedness
  • Cataract
  • Presbyopia
Tyndall effect is applicable when?
  • The diameter of the dispersed particle is not much smaller than the wavelength of the light used
  • The diameter of the dispersed particles is much smaller than the wavelength of the light used
  • The refractive indices of the dispersed phase and the dispersion medium must be same
  • The refractive indices of the dispersed phase and the dispersion medium must differ greatly in magnitude
A person suffering from an eyesight defect has a far point at $$40\ cm$$ and a near the point at $$25\ cm$$. The person uses a lens to see far away object. Find the near point of the person while wearing this lens.
  • $$50\ cm$$
  • $$\dfrac{200}{13}\ cm$$
  • $$\dfrac{200}{3}\ cm$$
  • $$25\ cm$$
Aperson suffering from defective vision can see objects clearly only beyond 100 cm from the eye. Find the power of lens required so that he can see clearly the object placed at a distance of distinct vision (D=25 cm)
  • 2D
  • 3D
  • -2D
  • -3D
The intensity of scattered light
  • $$I\propto { \lambda }^{ 4 }$$
  • $$I\propto { \lambda }^{ -4 }$$
  • $$I\propto { \lambda }^{ -2 }$$
  • $$I\propto { \lambda }^{ 2 }$$
A far sighted person can see object beyond 71 cm clearly if separation between glasses and eye lens is 2 cm, then find focal length of glass?
  • 23 cm
  • 34.5 cm
  • 18.4 cm
  • 30 cm
What kind of lens is used in the spectacles of a person suffering from Hypermetropia?
  • Convex.
  • Concave.
  • Plano -convex
  • A combination of cocave and convex.
In which order , the colour spectrum VIBGYOR appeared to him in the rainbow?
  • top to bottom
  • bottom to top
  • left to right
  • right to left
Which of the following statements is correct regarding the propagation of light of different colors of white light in the air?
  • Red light moves fastest
  • Blue light moves faster than green light
  • All the colours of the white light move with the same speed in empty space
  • Yellow light moves with the mean speed as that of the red and the violet light
To focus the image of a nearby object on the retina of an eye
  • The distance between eye-lens and retina is increased
  • The distance of the eye-lens and retina is decreased
  • The thickness of eye-lens is decreased
  • The thickness of eye-lens is. increased
Select the correct option and write the completes statements.
What is the reason for twinkling of stars?
  • Explosions accuring in stars from time to time
  • Absorption of light in the earth's armosphere.
  • Motion of stars.
  • Changing refractive index of the atmospheric gases.
A person can see clearly between 1 m and 2 m his corrective lenses should be 
  • Bifocals with power -0.5 D and additional +3.5 D
  • bifocals with power -1.0 D and additional +3 D
  • Concave with power 1.0 D
  • convex with power 0.5 D
What do ray PE denote?
1954218_492742fb080145d8b80bef4e6e7dd578.png
  • Angle of incidence
  • Incident ray
  • Refracted ray
  • Reflected ray
Ray FS is the refracted ray
1954221_e43b3d60dc764be2b1d87f99d1e9e7ad.png
  • True
  • False
Name the angle of prism.
1954223_5c57e62a3ebe47d1abf5dba0f92ff415.png
  • $$\angle$$$$A$$
  • $$\angle$$$$B$$
  • $$\angle$$$$C$$
  • $$\angle$$$$D$$
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