Hello guys, welcome to your own blog 'Pareeksha Time'. In this article, you will read CBSE Class 10 Science MCQs of Chapter 11. You will read Human Eye and Colorful World MCQs for Term-1 Board Exams 2021-22.
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Human Eye and Colourful World MCQs | MCQ Questions for Class 10 Physics Human Eye and Colourful World with Answers:-
1. When white light enters a prism, it gets split into its constituent colors. This is due to:
(a) different refractive indexes for the different wavelengths of each color
(b) each color has the same velocity in the prism.
(c) prism material has a high density.
(d) scattering of light
Answer: (a) different refractive indexes for the different wavelengths of each color
2. The air layer of atmosphere whose temperature is less then the hot layer behave as optically:
(a) Denser medium
(b) Rarer medium
(c) Inactive medium
(d) Either denser or rarer medium
Answer: (a) Denser medium
3. The splitting of white light into its component colours is called:
(a) Refraction
(b) Reflation
(c) Dispersion
(d) Tyndall effect
Answer: (c) Dispersion
4. At a particular minimum value of angle of deviation, the refracted ray becomes:
(a) Parallel to base of prism
(b) Perpendicular to base of prism
(c) Inclined at 45degrees w.r.t base of prism
(d) None
Answer: (a) Parallel to base of prism
5. Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
(a) Red light moves fastest.
(b) Blue light moves faster than green light.
(c) All the colours of the white light move with the same speed.
(d) Yellow light moves with the mean speed as that of the red and the violet light.
Answer: (c) All the colours of the white light move with the same speed.
6. A prism ABC (with BC as a base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in the figure. In which of the following cases, after dispersion, the third color from the top corresponds to the color of the sky?
Answer: (b)
7. The star appear shifted from their actual position due to the phenomenon of:
(a) Diffraction of light
(b) Scattering of light
(c) Refraction of light
(d) Reflection of light
Answer: (c) Refraction of light
8. 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:
(a) is scattered the most by smoke or fog.
(b) is scattered the least by smoke or fog.
(c) is absorbed the most by smoke or fog.
(d) moves fastest in air.
Answer: (b) is scattered the least by smoke or fog.
9. The clear sky appears blue because
[NCERT Exemplar Problems]
(a) blue light gets absorbed in the atmosphere.
(b) ultraviolet radiations are absorbed in the atmosphere.
(c) violet and blue lights get scattered more than lights of all other colours by the atmosphere.
(d) light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.
Answer: (c) violet and blue lights get scattered more than lights of all other colours by the atmosphere.
10. The angle at which the ray gets deviated is called:
(a) Angle of deviation
(b) Angle of dispersion
(c) Angle emergence
(d) Refracted angle
Answer: (a) Angle of deviation
11. The bluish colour of water in deep sea is due to
[NCERT Exemplar Problems]
(a) the presence of algae and other plants found in water
(b) reflection of sky in water
(c) scattering of light
(d) absorption of light by the sea
Answer: (c) scattering of light
12. What is the value of refractive index of the medium if the critical angle of incidence in a denser - rarer inter face is equal to 45° ?
(a) 1.414
(b) 2.414
(c) 2.0
(d) 3.25
Answer: (a) 1.414
13. Sunset Is Red Because At That Time The Light Coming From The Sun Has To Travel:
(a) Lesser thickness of earth’s atmosphere
(b) Greater thickness of earth’s atmosphere
(c) Varying thickness of earth’s atmosphere
(d) Along the horizon
Answer: (b) Greater thickness of earth’s atmosphere
14. Which of the following phenomena of light are involved in the formation of a rainbow?
(a) Reflection, Refraction and Dispersion
(b) Refraction, Dispersion and Total internal reflection
(c) Refraction, Dispersion and Internal reflection
(d) Dispersion, Scattering and Total internal reflection
Answer: (c) Refraction, Dispersion and Internal reflection
15. Due to atmospheric refraction of sunlight, the time from sunrise to sunset is lengthened by about:
(a) 6 minutes
(b) 2 minutes
(c) 4 minutes
(d) 5 minutes
Answer: (c) 4 minutes
16. After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are:
(a) ∠i and ∠r
(b) ∠i and ∠e
(c) ∠i, ∠e and ∠D
(d) ∠i, ∠r and ∠e
Answer: (b) ∠i and ∠e
17. A transparent refracting material which is bounded by two plane refracting surfaces is:
(a) Prism
(b) Convex lens
(c) Glass slab
(d) None
Answer: (a) Prism
18. At noon, the Sun appears white as:
(a) blue colour is scattered the most
(b) red colour is scattered the most
(c) light is least scattered
(d) all the colours of the white light are scattered away
Answer: (c) light is least scattered
19. The ratio of real depth to apparent depth is called:
(a) Refractive index
(b) Critical angle
(c) Lateral displacement
(d) None
Answer: (a) Refractive index
20. The colored light that refracts most while passing through a prism is:
(a) Yellow
(b) Violet
(c) Blue
(d) Red
Answer: (b) Violet
21. Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
(a) Twinkling of stars
(b) Stars seem higher than they actually are
(c) Advanced sunrise and delayed sunset
(d) Rainbow
Answer: (d) Rainbow
22. Which of the following colors is least scattered by fog, dust of smoke?
(a) Violet
(b) Blue
(c) Red
(d) Yellow
Answer: (c) Red
23. When white light enters a prism, it gets split into its constituent colors. This is due to:
(a) different refractive indexes for the different wavelengths of each color
(b) each color has the same velocity in the prism.
(c) prism material has a high density.
(d) Scattering of light
Answer: (a) different refractive indexes for the different wavelengths of each color
24. The image shows the dispersion of the white light in the prism.
What will be the colours of the X, Y and Z?
(a) X: Red; Y: Green; Z: Violet
(b) X: Violet; Y: Green; Z: Red
(c) X: Green; Y: Violet; Z: Red
(d) X: Red; Y: Violet; Z: Green
Answer: (b) X: Violet; Y: Green; Z: Red
25. Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
(a) Dispersion of light
(b) Scattering of light
(c) Total internal reflection of light
(d) Reflection of light from the earth
Answer: (b) Scattering of light
26. The deflection of light by minute particles and molecules of the atmosphere in all directions is called ____________ of light.
(a) Dispersion
(b) Scattering
(c) Interference
(d) Tyndall effect
Answer: (b) Scattering
27. The atmospheric refraction of light causes the twinkling of:
(a) Planets only
(b) Stars only
(c) Planets and Stars
(d) Stars and Satellites
Answer: (b) Stars only
28. When white light enters a glass prism from air, the angle of deviation is least for:
(a) Blue light
(b) Yellow light
(c) Violet light
(d) Red light
Answer: (d) Red light
So guys here comes end. In this article, I shared 25+ Human Eye and Colourful World MCQs of CBSE Class 10 Physics MCQs 2021-22.
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