Human Eye & Colourful World — Class 10 MCQ Quiz (25 Questions)

Select an option and tap Check Answer.

Easy

1. The ability of the eye lens to change its focal length is called:

A) Refraction B) Accommodation C) Dispersion D) Constriction

Easy

2. The image is formed on which part of the eye?

A) Iris B) Lens C) Retina D) Cornea

Easy

3. Myopia is corrected using:

A) Convex lens B) Concave lens C) Cylindrical lens D) Bifocal lens

Easy

4. Hypermetropia is corrected using:

A) Concave lens B) Convex lens C) Cylindrical lens D) None

Easy

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

A) Cornea B) Iris C) Retina D) Pupil

Easy

6. The splitting of white light into colours is called:

A) Reflection B) Diffraction C) Dispersion D) Interference

Easy

7. The near point of a normal human eye is:

A) 25 cm B) 50 cm C) 75 cm D) 1 m

Easy

8. Colour blindness is caused due to the defect in:

A) Rod cells B) Cone cells C) Iris D) Cornea

Easy

9. The red colour of the sky at sunrise/sunset is due to:

A) Less scattering B) Higher wavelength of red C) Absorption D) Reflection

Easy

10. Blue colour of the sky is due to:

A) Reflection B) Scattering C) Refraction D) Absorption

Moderate

11. The ability to see objects both near and far is due to:

A) Accommodation B) Persistence of vision C) Cataract removal D) Corneal refraction only

Moderate

12. The power of a lens used to correct myopia of focal length −50 cm is:

A) −2 D B) +2 D C) −1 D D) +1 D

Moderate

13. Twinkling of stars is due to:

A) Reflection B) Atmospheric refraction C) Dispersion D) Absorption

Moderate

14. The colour seen at the top of a primary rainbow is:

A) Blue B) Violet C) Red D) Green

Moderate

15. The danger signals are red because:

A) Red scatters least B) Red is beautiful C) Red absorbs less D) Red has lower speed

Moderate

16. Cataract causes:

A) Colour blindness B) Cloudy lens C) Change in retina shape D) Blue vision

Moderate

17. The phenomenon responsible for the apparent flattening of the sun at sunrise and sunset:

A) Reflection B) Scattering C) Atmospheric refraction D) Diffraction

Moderate

18. The far point of a myopic person is:

A) Infinity B) 25 cm C) Finite distance D) Zero

Hard

19. A convex lens of focal length 40 cm is used to correct hypermetropia. The power of the lens is:

A) +2.5 D B) +1.5 D C) +4 D D) +0.4 D

Hard

20. What causes the spectrum in a prism?

A) Single refraction B) Differential refraction for different wavelengths C) Scattering inside glass D) Reflection at surfaces

Hard

21. For rainbow formation, which sequence is correct?

A) Refraction → Reflection → Refraction B) Reflection → Refraction → Scattering C) Scattering → Refraction → Dispersion D) Refraction → Scattering → Reflection

Hard

22. The power of accommodation of normal human eye is about:

A) 4 D B) 10 D C) 20 D D) 14 D

Hard

23. The colour of the sky on the moon appears black because:

A) Excess scattering B) No atmosphere C) No sunlight D) Strong reflection

Hard

24. A person has both myopia and hypermetropia. The defect is called:

A) Cataract B) Presbyopia C) Astigmatism D) Photophobia

Hard

25. Which colour deviates the most in a prism?

A) Red B) Green C) Violet D) Blue