Solve MCQ Quiz Class 10 Science Chapter- 10 The Human Eye and the Colourful World
Q1. What is the primary function of the lens in the human eye?
(a) To regulate light intensity
(b) To focus light on the retina
(c) To protect the eye from dust
(d) To control eye movements
✅ Answer: (b) — The lens focuses light on the retina to form clear images.
Q2. The ability of the eye to adjust its focal length is called:
(a) Myopia
(b) Hypermetropia
(c) Accommodation
(d) Presbyopia
✅ Answer: (c) — Accommodation refers to the eye’s ability to change its focal length to see objects at different distances.
Q3. What is the least distance of distinct vision for a young adult with normal vision?
(a) 25 m
(b) 2.5 cm
(c) 25 cm
(d) 2.5 m
✅ Answer: (c) — The least distance of distinct vision for a young adult is approximately 25 cm.
Q4. Myopia is also known as:
(a) Near-sightedness
(b) Far-sightedness
(c) Presbyopia
(d) Astigmatism
✅ Answer: (a) — Myopia is the condition where a person can see nearby objects clearly but struggles with distant objects.
Q5. Which type of lens is used to correct myopia?
(a) Convex lens
(b) Concave lens
(c) Bifocal lens
(d) Cylindrical lens
✅ Answer: (b) — A concave lens is used to correct myopia by diverging light rays before they enter the eye.
Q6. What happens to the image formed by the eye lens on the retina?
(a) It is upright and virtual
(b) It is inverted and real
(c) It is enlarged and virtual
(d) It is diminished and real
✅ Answer: (b) — The eye lens forms an inverted and real image on the retina.
Q7. The phenomenon of splitting white light into its component colors is called:
(a) Reflection
(b) Refraction
(c) Dispersion
(d) Scattering
✅ Answer: (c) — Dispersion is the process of splitting white light into its component colors.
Q8. Which color of light bends the most when passing through a prism?
(a) Red
(b) Green
(c) Blue
(d) Violet
✅ Answer: (d) — Violet light bends the most due to its shorter wavelength.
Q9. Why do stars twinkle?
(a) They are moving
(b) Atmospheric refraction
(c) They are too far away
(d) They emit variable light
✅ Answer: (b) — Stars twinkle due to atmospheric refraction, which causes the apparent position of stars to fluctuate.
Q10. What is the far point of a normal eye?
(a) 25 cm
(b) 1 m
(c) 2.5 m
(d) Infinity
✅ Answer: (d) — The far point of a normal eye is at infinity.
Q11. The blue color of the sky is primarily due to:
(a) Reflection of sunlight
(b) Scattering of light
(c) Absorption of light
(d) Dispersion of light
✅ Answer: (b) — The blue color of the sky is due to the scattering of light by air molecules.
Q12. What type of lens is used to correct hypermetropia?
(a) Concave lens
(b) Convex lens
(c) Bifocal lens
(d) Cylindrical lens
✅ Answer: (b) — A convex lens is used to correct hypermetropia by converging light rays before they enter the eye.
Q13. The phenomenon where light paths become visible in a colloidal solution is known as:
(a) Reflection
(b) Tyndall Effect
(c) Dispersion
(d) Diffraction
✅ Answer: (b) — The Tyndall Effect occurs when light is scattered by colloidal particles, making the light path visible.
Q14. What is the role of the ciliary muscles in the eye?
(a) To control the size of the pupil
(b) To change the shape of the lens
(c) To protect the retina
(d) To transmit signals to the brain
✅ Answer: (b) — The ciliary muscles change the shape of the lens to adjust its focal length.
Q15. Which of the following statements is true about presbyopia?
(a) It is a condition of near-sightedness.
(b) It occurs due to aging and affects near vision.
(c) It can be corrected with concave lenses.
(d) It is a temporary condition.
✅ Answer: (b) — Presbyopia occurs due to aging and results in difficulty seeing nearby objects.