Class 10 Exam > Class 10 Notes > Human Eye Colourful World - MCQ, Science, Class 10
Human Eye Colourful World - MCQ, Science, Class 10 PDF Download
Multiple choice questions
1. When we enter a cinema hall, we cannot see properly for a short time. This is because-
a) Pupil does not open
b) Pupil does not close
c) Adjustment of size of pupil takes some time
d) None of these above
Ans: (c)
2. The property of persistence of vision is used in-
a) Short sightedness
b) Long sightedness
c) Cinematography
d) Colour vision
Ans: (c)
3. Variable focal length of eye is responsible for-
a) Accommodation of eye
b) Persistence of vision
c) Colour blindness
d) Least distance of distinct vision
Ans: (a)
4. A concave lens of suitable focal length is used for correcting a-
a) Myopic eye
b) Hypermetropic eye
c) Both a and b
d) nor a nor b
Ans: (a)
5. Splitting of white light into seven colours on passing through the glass prism is called-
a) Reflection
b) Refraction
c) Scattering
d) Dispersion
Ans: (d)
6. The broad wavelength range of visible spectrum is-
a) 4000-8000A
b) 2000-4000A
c) 10000-20000A
d) None of the above
Ans: (a)
7. For which colour, refractive index of glass is maximum?
a) Red
b) Violet
c) Green
d) Yellow
Ans: (b)
8. Which colour suffers least deviation on passing through a prism?
a) Red
b) Violet
c) Indigo
d) Blue
Ans: (a)
9. Blue colour of sky is due to-
a) Scattering of light
b) Reflection of light
c) Refraction of light
d) Diffraction of light
Ans: (a)
10. Clouds appear red due to Rayleigh scattering. The statement is-
a) True
b) False
Ans: (b)
11. Red colour of the sun at the time of sunrise and sunset is because-
a) Red colour is least scattered
b) Blue colour is least scattered
c) Red colour is scattered the most
d) All colours are equally scattered
Ans: (a)
12. A human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to –
(a)Persistence of vision
(b)Near sightedness
(c)Accommodation
(d)Far sightedness
Ans: (c)
13. Cinematography makes use of -
(a) Accommodation
(b) Persistence of vision
(c) Least distance of distinct vision
(d) Bi-focal lens system
Ans: (b)
14. Human eye forms the image of an object at its –
(a)Cornea
(b) Pupil
(c)Iris
(d) Retina
Ans: (d)
15. The change of focal length of an eye lens to focus the image of objects at varying distances is done by the action of the -
(a)Pupil
(b)Retina
(c)Ciliary muscles
(d)Blind spot
Ans: (c)
16. The convex lens of focal length 20cm each are separated by a distance of 10cm for focal length of combination is :-
(a) 20cm
(b) 40cm
(c) 30cm
(d) 13.3cm
Ans: (d)
17. Two convex lenses of focal length 10cm and 20cm are kept in contact .The focal length of the combination is:
(a) 20/3 cm
(b) 40 cm
(c) 12cm
(d) 15 cm
Ans: (a)
18. Two lenses of power –1.75D and +2.75D are placed in contact. The focal length of the combination is :-
(a)50cm
(b)100cm
(c) 75cm
(d) 125cm
Ans: (b)
19. Which eye piece satisfies the condition for spherical aberration:-
(a)Huygen’s eye piece
(b)Ramsden’s eye piece
(c)Both a and b
(d)None of the above
Ans: (a)
20. A myopic person cannot see clearly:-
(a)Distant objects
(b)Near objects
(c)Near and distant objects
(d)None of the above
Ans: (b)
21. A long-sighted person cannot see clearly:
(a)Near objects
(b) Distant objects
(c) Both distant and near objects
(d) None
Ans: (a)
22. A person having Presbyopia should use:-
(a)Convex lens
(b) Concave lens
(c) Cylindrical lenses
(d) Bifocal lenses
Ans: (d)
23. A person cannot see fundamental colours (red, blue, green). This defect is called:-
(a) Myopia
(b) Presbyopia
(c) Colour blindness
(d) Astigmatic
Ans: (c)
24. The defect of astigmatism can be rectified by using: -
(a)Convex lens
(b) Cylindrical lens
(c) Concave lens
(d ) Bifocal lens
Ans: (b)
FAQs on Human Eye Colourful World - MCQ, Science, Class 10
| 1. What is the role of the iris in determining eye color? |  |
Ans. The iris is the part of the eye that determines eye color. It is a muscle that controls the size of the pupil, which regulates the amount of light that enters the eye. The color of the iris is determined by the amount and type of melanin in the front layers of the iris.
| 2. Can two parents with blue eyes have a child with brown eyes? | |
Ans. Yes, it is possible for two parents with blue eyes to have a child with brown eyes. Eye color is determined by multiple genes, and it is possible for recessive genes for brown eyes to be passed down from both parents and express themselves in their child.
| 3. What are some factors that can affect eye color? | |
Ans. Eye color can be affected by several factors, including genetics, age, and disease. Some medications and drugs can also cause changes in eye color, as can exposure to certain chemicals.
| 4. Is it true that people with lighter eye colors are more sensitive to light? | |
Ans. Yes, it is true that people with lighter eye colors tend to be more sensitive to light than those with darker eye colors. This is because darker irises contain more melanin, which helps to absorb more light and protect the eye from glare.
| 5. Can eye color change over time? | |
Ans. Yes, eye color can change over time, especially during childhood and adolescence. This is because the amount and type of melanin in the iris can change as a person ages. Certain diseases and medications can also cause changes in eye color. However, once a person reaches adulthood, their eye color is usually stable and does not change significantly.
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