Class 10 Physics MCQs: Important Questions from Human Eye and The Colourful World for CBSE Board 2025


Human Eye and Colourful World MCQs
Important Class 10 Physics Human Eye and Colourful World MCQs

Top 20 Must-Know MCQs from  Human Eye and Colourful World MCQs for CBSE Class 10 Board 2025

Are you preparing for the CBSE Class 10 Board Exams 2025? Scoring well in Science, especially Physics, requires a strong grasp of key concepts. One of the most crucial chapters, “The Colourful World,” explains fascinating phenomena like refraction, dispersion, scattering of light, and the working of the human eye.

To help you ace your exams, we have compiled 20 important multiple-choice questions (MCQs) that cover all essential topics in a simple and engaging way. Each question comes with detailed explanations to strengthen your understanding and boost your confidence. So, let’s dive in and test your knowledge!

The human eye and the world of light play a crucial role in our daily lives. This chapter focuses on refraction, dispersion, scattering of light, and vision defects.

Mastering these concepts is essential for scoring high in CBSE Class 10 Science Board Exams. Below are 20 must-know MCQs to test your understanding.

Multiple Choice Questions (MCQs)

Note: “Scroll to the end for complete answers and in-depth explanations!”.

1. Which part of the human eye controls the amount of light entering it?

a) Cornea
b) Iris
c) Retina
d) Optic nerve

2. What is the primary function of the retina?

a) To focus light
b) To detect and process light signals
c) To control the pupil size
d) To protect the eye from dust

3. The twinkling of stars is due to which optical phenomenon?

a) Reflection
b) Refraction
c) Scattering
d) Diffraction

4. Why does the sky appear blue during the daytime?

a) Due to reflection of light
b) Due to scattering of light
c) Due to refraction of light
d) Due to total internal reflection

5. Which lens is used to correct myopia (short-sightedness)?

a) Convex lens
b) Concave lens
c) Bifocal lens
d) Cylindrical lens

6. What is the reason behind the formation of a rainbow?

a) Reflection of light
b) Scattering of light
c) Refraction and dispersion of light
d) Polarization of light

7. Which phenomenon causes the sun to appear reddish at sunrise and sunset?

a) Dispersion
b) Scattering of light
c) Reflection
d) Refraction

8. What is the minimum distance required for a normal human eye to see an object clearly?

a) 10 cm
b) 25 cm
c) 50 cm
d) 100 cm

9. Which color of light bends the most when passing through a prism?

a) Red
b) Green
c) Blue
d) Violet

10. Which eye defect is caused by the elongation of the eyeball?

a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism

11. Which optical instrument is used to correct hypermetropia?

a) Concave lens
b) Convex lens
c) Bifocal lens
d) Cylindrical lens

12. What is the function of the optic nerve?

a) Focuses light on the retina
b) Adjusts the size of the pupil
c) Transmits visual information to the brain
d) Helps in color perception

13. Why do clouds appear white?

a) Due to refraction of light
b) Due to dispersion of light
c) Due to scattering of light
d) Due to absorption of light

14. What is the far point of a normal human eye?

a) 10 meters
b) 25 cm
c) 50 meters
d) Infinity

15. Which phenomenon causes mirages in deserts?

a) Dispersion
b) Total internal reflection
c) Diffraction
d) Polarization

16. Which light-sensitive cells in the retina help in color vision?

a) Rod cells
b) Cone cells
c) Bipolar cells
d) Ganglion cells

17. Which eye defect is common in older people due to lens hardening?

a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism

18. Which property of light is responsible for the formation of shadows?

a) Reflection
b) Light travels in a straight line
c) Refraction
d) Diffraction

19. What happens when white light passes through a glass prism?

a) It reflects
b) It disperses into different colors
c) It refracts without dispersion
d) It gets absorbed

20. Which color of light is least scattered by the atmosphere?

a) Red
b) Blue
c) Green
d) Violet

Answers and Explanations

Click Here for Answers/Explanations

1. Answer: b) Iris

Explanation: The iris controls the size of the pupil and regulates the amount of light entering the eye.

2. Answer: b) To detect and process light signals

Explanation: The retina contains photoreceptor cells that convert light into electrical signals for the brain.

3. Answer: b) Refraction

Explanation: Atmospheric refraction bends starlight, causing stars to twinkle.

4. Answer: b) Due to scattering of light

Explanation: Shorter blue wavelengths are scattered more by the atmosphere, making the sky appear blue.

5. Answer: b) Concave lens

Explanation: A concave lens diverges light, correcting myopia (short-sightedness).

6. Answer: c) Refraction and dispersion of light

Explanation: Water droplets refract and disperse sunlight to form a rainbow.

7. Answer: b) Scattering of light

Explanation: The atmosphere scatters shorter wavelengths, leaving only red and orange light visible.

8. Answer: b) 25 cm

Explanation: The near point for a normal human eye is 25 cm.

9. Answer: d) Violet

Explanation: Violet light bends the most due to its shortest wavelength.

10. Answer: a) Myopia

Explanation: Myopia is caused by an elongated eyeball, making distant objects appear blurry.

11. Answer: b) Convex lens

Explanation: A convex lens converges light, correcting hypermetropia (far-sightedness).

12. Answer: c) Transmits visual information to the brain

Explanation: The optic nerve carries signals from the retina to the brain.

13. Answer: c) Due to scattering of light

Explanation: Water droplets scatter all wavelengths, making clouds appear white.

14. Answer: d) Infinity

Explanation: The far point of a normal human eye is considered to be at infinity.

15. Answer: b) Total internal reflection

Explanation: In deserts, light bends due to temperature differences, causing total internal reflection and forming mirages.

16. Answer: b) Cone cells

Explanation: Cone cells in the retina detect colors, while rod cells help in low-light vision.

17. Answer: c) Presbyopia

Explanation: With age, the eye lens loses flexibility, leading to presbyopia, which affects both near and distant vision.

18. Answer: b) Light travels in a straight line

Explanation: Shadows are formed because light moves in straight lines and is blocked by opaque objects.

19. Answer: b) It disperses into different colors

Explanation: When white light passes through a prism, it splits into a spectrum of colors due to dispersion.

20. Answer: a) Red

Explanation: Red light has the longest wavelength and is scattered the least, which is why the Sun appears reddish during sunrise and sunset.

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Important Advice:

Success in exams is not just about memorizing facts but understanding concepts and applying them smartly. Every great achiever was once a student like you, facing challenges but never giving up. Keep practicing, stay curious, and believe in your ability to excel. With the right preparation and determination, you can conquer any exam! Keep learning, keep growing, and shine bright in your CBSE Class 10 Board Exams 2025!


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