Class 10 Science Human Eye (Important Questions with Answers)

Important Questions With Answers


1. How is the eye lens held in its position?

PG logo with course.JPGAns: – Ciliary muscles hold the eye in position.PG logo with course.JPG

2. What is meant by near point?

PG logo with course.JPGAns: – The nearest point up to which an eye can see clearly is called the near point of the eye.PG logo with course.JPG

3. What is meant by least distance of distinct vision?

PG logo with course.JPGAns: – The minimum distance up to, which an eye can see, clearly is called the least distance of distinct vision. For a normal human eye this distance is around 25 cm.PG logo with course.JPG

4. Which part of the eye controls the amount of the light entering the eye?

PG logo with course.JPGAns: The pupil.PG logo with course.JPG

5. Which liquid fills the space behind the cornea?

PG logo with course.JPGAns: – The aqueous humor.PG logo with course.JPG

6. Why is blind spot so called?

PG logo with course.JPGAns: An image formed at this point is not sent to the brain.PG logo with course.JPG

7. Name the defects of vision of human eye?

PG logo with course.JPGAns: – PG logo with course.JPGa. Myopia PG logo with course.JPGb. Hypermetropia PG logo with course.JPGc. AstigmatismPG logo with course.JPG

8. Where is the image formed in an eye suffering from near sightedness or long sightedness?

PG logo with course.JPGAns: – The image is formed in front of retina.PG logo with course.JPG

9. How is long sightedness corrected?

PG logo with course.JPGAns: By using a convex lens of suitable focal length.PG logo with course.JPG

10. A person has to use a concave lens in his spectacles. What defect of vision is he suffering from?

PG logo with course.JPGAns: – Short sightednessPG logo with course.JPG

11. What is the twinkling of stars due to?

PG logo with course.JPGAns : Refraction of light by earth’s atmosphere.PG logo with course.JPG

12. Which scientist first explains the dispersion of light?

PG logo with course.JPGAns : Isaac NewtonPG logo with course.JPG

13. Name the delicate membrane in the eye having enormous number of light sensitive cells.

PG logo with course.JPGAns: – The retinaPG logo with course.JPG

14. What kind of lens is used in the spectacles of a person suffering from Myopia?

PG logo with course.JPGAns: A concave lensPG logo with course.JPG

15. On what factor the colour of the scattered light depends?

PG logo with course.JPGAns: – The colour of the scattered light depends on the size of the scattering particles.PG logo with course.JPG

16. What is a function of choroids?

PG logo with course.JPGAns: It contains black pigment, which avoids internal reflections within the eye.PG logo with course.JPG

17. Why does sky appear blue on a clear sky?

PG logo with course.JPGAns: – This is due to the scattering of light rays. The blue colour light only reach to us .PG logo with course.JPG

18. What happens to the lens and the ciliary muscles when you are looking at nearby objects?

PG logo with course.JPGAns: The ciliary muscles contract and the lens becomes thick i.e. its radius of curvature
decreases.PG logo with course.JPG

18. Name the component of white light that deviates the least and the component that deviates the most while passing through a glass prism.

PG logo with course.JPGAns. Red deviate the least and violet deviate the most.PG logo with course.JPG

19. When one enters a dim-light room from bright light, one is unable to see the objects in the dim-light room for some time. Why?

PG logo with course.JPGAns : When one enters a dim-light room from bright light, Pupil takes some time to adjust in order to control the light. When the light is very bright, the iris contracts the pupil to allow less light to enter the eye. However, in dim light the iris expands the pupil to allow more light to enter the eye.PG logo with course.JPG

20. Why is the refractive index of atmosphere different at different altitudes?

PG logo with course.JPGAns : The refractive index of atmosphere different at different altitudes because the physical conditions of the refracting medium (air) are not stationary.PG logo with course.JPG

 

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