Class – 10 Human Eye and Colourful World Additional Questions and Answers mcq
Class 10 Science has a fascinating syllabus that introduces new concepts of human physiology to the students. Chapter 11 of this syllabus explains the basic and advanced concepts of the human eye. It is about how the human eye performs to provide a colourful world to the beholder. To understand these concepts, study this chapter well and solve the Class 10 Human Eye MCQ framed by the experts.
HSLC SEBA Class 10 Science MCQs Chapter 11 The Human Eye and the Colourful World with Additional Question Answers
CBSE Class 10 Science MCQs Chapter 11 The Human Eye and the Colourful World help students learn important concepts efficiently. Students preparing for Class 10 Science Board exams must not forget to practise the multiple-choice questions. Here, we have provided the MCQs of Chapter 11, The Human Eye and the Colourful World, so that students can memorise the fundamental concepts with ease. The Human Eye and the Colourful World MCQs will help students to fetch marks from this chapter easily. These multiple choice questions on Human Eye and the Colourful World are based on the latest Class 10 Science Syllabus and are designed by our subject experts.
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
- What is pupil ? What is the function of pupil human eye ?
Ans : Pupil is a narrow hole through which light enters in the eye and falls on eye lens.
The pupil regulates and controls the amount of light entering the eye .
2. Name the light sensitive cell present in the retina of an eye .
Ans: Rods and cones.
3. What do you mean by the term accommodation ?
Ans : The power of accommodation of the eye is the maximum variation of its power for focusing on near and for objects .
4. What is blind spot ?
Ans : At the junction of the optic nerve and the retina there are no sensory cells. so , no vision is possible at the spot. This is called the blind spot.
5. What is night blindness ?
Ans: Night blindness is a disease caused due to deficiency of vitamin A when patient can not see clearly in dimlight .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
6. what is color blindness ?
Ans : If some cone cells are absent from retina the person is not able to distinguish the colour of object . It is called colour blindness.
7. Define the part of the eye that has real , inverted image of the object formed on it .
Ans : Retina.
8. What is the function of ciliary muscle ?
Ans : Ciliary muscles can increase or decrease the focal length of eye lens to focus the images at retina .
9. Mention the common defects of vision of the human eye .
Ans: Defects of vision : A normal eye can see objects clearly at any distance between 25 cm and infinity from the eye. Sometimes , a human eye gradually loses its power of accommodation . Then we can not see the object clearly our vision becomes defective. There are mainly four common defects of vision which can be corrected by the suitable use of eye glasses.These defects are :
- Myopia or near sightedness
- Hypermetropia or for sightedness
- Presbyopia
- Astigmatism .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
10. What is myopia ? Suggest how this defect can be corrected ?
Ans : Myopia is also known as near sightedness . A person with myopia can use nearby objects but can not see distant objects distinctly .
Myopia can be corrected by using a concave lens of suitable power .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
11. What is hypermetropia ? Suggest how this defect can be corrected .
Ans : Hypermetropia is also known as far sightedness . A person with hypermetropia can see distant objects clearly but can not see near by objects distinctly.
Hypermetropia can be corrected by using a convex lens of suitable power.
12. Write two reasons of myopia .
Ans : Causes of myopia :
i. Excessive curvature of the eye lens .
ii. Elongation of the eye ball.
13. What are the causes of hypermetropia ?
Ans: Causes of hypermetropia :
i. The focal length of the eye lens is too long .
ii. The eye ball has become to small .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
14. What is presbyopia ? How is presbyopia rectified ?
Ans : The power of accommodation of the eye usually decreases with aging . For most of the people , the near point gradually reduces away . They find it difficult to see nearby objects comfortably and distinctly without corrective eye glasses .
The defect is presbyopia can be rectified by using bi focal lenses of suitable power .
15. What is astigmatism ? How it is corrected ?
Ans : Astigmatism : It is a defect of vision in which a person can not simultaneously see both the horizontal and vertical views of an object with the some clearily .
Causes of astigmatism : This defect occurs when the cornea of the eye is not perfectly spherical . This results in objects in one direction using well focused while those in perpendicular direction are not well focused .
Correction of astigmatism : Astigmatism can be corrected by using cylindrical lenses . They have different curvatures in horizontal and vertical directions and so they can be oriented suitably to compensate for irregularities in the cornea .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
16. What is cataract ?
Ans : Due to development of membrane over the eye lens the eye become ineffective or the image becomes hazy . This problem is called cataract .
17. What do you mean by dispersion of light ? What is its cause ?
Ans : When a white light pass through a glass prism it splits into its seven constituent colour . This phenomenon is called dispersion of light .
Causes of dispersion of white light : Light rays of different colour travel with some speed in vaccum . But in refracting medium like glass , water etc. Light or different different colours travel with different speeds . The speed of violet colour is least , while the speed of red colour is the largest in glass . As a result , the refractive index of glass is larger for violet colour and least for red colour . The violet colour is deviated most while the red colour is deviated least on passing through the prism . Other colours are deviated by immediate angles . so , different component colours of white light get dispersion on passing through a glass prism .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
18. Explain the formation of rainbow in the sky ?
Ans : A rainbow appears in the sky after as hover in the direction opposite to the sun . It is a natural spectrum of the sunlight . The water droplets in the atmosphere act as small prism . The sun light suffers a refraction and dispersion in them . They are then the internally reflected in the drop and finally refracted out . When such rays reach a observer he sees a rainbow .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
19. What do you mean by atmospheric refraction ?
Ans : Light coming from the celestial objects like the sun or the stars suffer refraction in the air . This is called atmospheric refraction . Several interesting phenomenon such as the twinkling of stars and early sunrise and delayed sunsets are results of atmospheric refraction .
20. What is tyndall effect ?
Ans : The Earth’s atmosphere contains smoke , tiny water droplets and dust grains . It resembles a colloidal solution on which small particles remain suspended when a beam of light gets scattered from such particles. The path of the beam becomes visible . The effect is called tyndall effect . This effect is usually caused by suspended particles of relatively clag size .
We can observe the tyndall effect when light enters a dusty or smoke filled enclosure through a small hole .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
21. Why is the colour of the clear sky blue ?
Ans : When the sunlight passes through the atmosphere it suffers on the molecules of air and suspended fine particles . The molecules of the air such as N2 and O2 and other fine particles of the atmosphere which are smaller than the wave length of light of any colour scatter the shorter wavelength more effectively. Thus the blue colour of light is scattered the most while the red is scattered the least in the atmosphere. The blue colour of the sky is due to the scattering of sunlight by molecule of the atmosphere . When we look at the sky the scattered light enters our eyes and thus light contains blue light in a large proportion . That is why the sky appears blue .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
22. Why does sun appear reddish at sunrise and sunset ?
Ans : During the sunrise and sunset the sun remain near the horizon . The light rays have to pass through a larger thickness of the atmosphere when the sum is overhead at non consequently , the lower wavelengths in the blue region are almost completely scattered away by air molecules . The higher wavelengths of the red region are least scattered and reach our eyes. Hence the sun appears almost reddish at sunrise and sunset .
23. The sun is visible to us about 2 minutes before the actual sunrise and about 2 minutes after actual sunset. Give reason .
Ans : The sun is visible to us about 2 minutes before the actual sunrise and about 2 minutes about actual sunset because of atmospheric refraction . By actual sunrise by the sun . The time difference between the actual sunset and the appearance sunset is about 2 minutes .
24. Why are the traffic light signals ear danger signals of red colour ?
Ans : In the visible spectrum the colour has the largest wave length the red colour is least scattered by fog or dust particles . So, we can also observed red colour easily even in foggy and dusty condition .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
25. Which is the cause of blue colour of the ocean ?
Ans : The water molecules of the ocean scatter blue light more strong that light of other colours . So, ocean appears bluish .
Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
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Class – 10 HUMAN EYE AND COLOURFUL WORLD Additional Questions and Answers mcq
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