Q1. What is the chemical formula of water?
(A) Cornea
(B) Iris
(C) Pupil
(D) Retina
Answer: (D) Retina

Q2. The focal length of the eye lens is adjusted by the:
(A) Retina
(B) Optic nerve
(C) Ciliary muscles
(D) Pupil
Answer: (C) Ciliary muscles

Q3. The blue colour of the sky is due to:
(A) Reflection of sunlight
(B) Refraction of sunlight
(C) Scattering of light
(D) Dispersion
Answer: (C) Scattering of light

Q4. A rainbow is always formed in a direction:
(A) Towards the Sun
(B) Opposite to the Sun
(C) Perpendicular to the Sun
(D) Vertical to the horizon
Answer: (B) Opposite to the Sun

Q5. Which colour of light bends the most through a prism?
(A) Red
(B) Yellow
(C) Violet
(D) Orange
Answer: (C) Violet

Q6. A person with myopia can see:
(A) Distant objects clearly
(B) Nearby objects clearly
(C) Both clearly
(D) Neither
Answer: (B) Nearby objects clearly

Q7. The eyeball is approximately spherical with a diameter of:
(A) 2.0 cm
(B) 2.3 cm
(C) 2.5 cm
(D) 3.0 cm
Answer: (B) 2.3 cm

Q8. Which gas bends the least through a prism?
(A) Violet
(B) Blue
(C) Green
(D) Red
Answer: (D) Red

Q9. The phenomenon of scattering of light by colloidal particles is called:
(A) Atmospheric refraction
(B) Dispersion
(C) Tyndall effect
(D) Reflection
Answer: (C) Tyndall effect

Q10. Myopia is also known as:
(A) Far-sightedness
(B) Near-sightedness
(C) Presbyopia
(D) Cataract
Answer: (B) Near-sightedness

Q11. Which of the following can correct hypermetropia?
(A) Concave lens
(B) Bifocal lens
(C) Convex lens
(D) Plane lens
Answer: (C) Convex lens

Q12. Planets do not twinkle because:
(A) They are far away
(B) They are extended sources of light
(C) They do not emit light
(D) Their light is not refracted
Answer: (B) They are extended sources of light

Q13. Red colour is used in danger signals because:
(A) It absorbs most light
(B) It is scattered the most
(C) It is scattered the least
(D) It is soothing
Answer: (C) Red is scattered the least

Q14. What is the least distance of distinct vision for a young adult?
(A) 25 m
(B) 2.5 cm
(C) 25 cm
(D) Infinity
Answer: (C) 25 cm

Q15. The twinkling of stars is due to:
(A) Reflection of light
(B) Dispersion
(C) Atmospheric refraction
(D) Scattering
Answer: (C) Atmospheric refraction

Q16. The crystalline lens is made up of:
(A) Hard glass-like material
(B) Fibrous jelly-like material
(C) Rigid plastic
(D) Fluid
Answer: (B) Fibrous, jelly-like material

Q17. Hypermetropia is also called:
(A) Near-sightedness
(B) Far-sightedness
(C) Night blindness
(D) Colour blindness
Answer: (B) Far-sightedness

Q18. The angle between the two lateral faces of a prism is called:
(A) Angle of incidence
(B) Angle of deviation
(C) Angle of prism
(D) Angle of emergence
Answer: (C) Angle of prism

Q19. The sun is visible about ____ minutes before actual sunrise due to refraction:
(A) 1
(B) 2
(C) 3
(D) 4
Answer: (B) 2

Q20. Eyes must be removed within how many hours for donation?
(A) 1–2 hours
(B) 4–6 hours
(C) 10–12 hours
(D) 24 hours
Answer: (B) 4–6 hours

Q21. Which person cannot donate eyes?
(A) Diabetes
(B) Hypertension
(C) Rabies
(D) Uses spectacles
Answer: (C) A person who died of Rabies

Q22. The ability of the lens to adjust focal length is called:
(A) Refraction
(B) Dispersion
(C) Accommodation
(D) Reflection
Answer: (C) Accommodation

Q23. The angle between incident and emergent ray in a prism is called:
(A) Angle of prism
(B) Angle of deviation
(C) Angle of refraction
(D) Angle of reflection
Answer: (B) Angle of deviation

Q24. Very fine particles in the atmosphere mainly scatter:
(A) Red
(B) Blue
(C) Green
(D) White
Answer: (B) Blue light

Q25. The apparent position of a star is slightly:
(A) Lower
(B) Higher
(C) The same
(D) Left
Answer: (B) Higher

Q26. The eye lens forms which type of image on retina?
(A) Virtual & erect
(B) Real & erect
(C) Virtual & inverted
(D) Real & inverted
Answer: (D) Real and inverted

Q27. Presbyopia is caused due to:
(A) Elongation of eyeball
(B) Weakening of ciliary muscles
(C) Excessive curvature
(D) Cloudy lens
Answer: (B) Weakening of ciliary muscles

Q28. A bifocal lens is used to correct:
(A) Myopia only
(B) Hypermetropia only
(C) Both
(D) Cataract
Answer: (C) Both Myopia and Hypermetropia

Q29. The upper part of a bifocal lens is a:
(A) Convex lens for near vision
(B) Concave lens for distant vision
(C) Convex lens for distant vision
(D) Concave lens for near vision
Answer: (B) Concave lens for distant vision

Q30. The Sun appears red at sunrise because:
(A) Sun is cooler
(B) Red is scattered most
(C) Blue light is scattered away
(D) Refraction is minimum
Answer: (C) Blue light is scattered away

Q31. The splitting of white light into colours is:
(A) Reflection
(B) Refraction
(C) Scattering
(D) Dispersion
Answer: (D) Dispersion

Q32. To see nearby objects clearly, ciliary muscles:
(A) Relax
(B) Contract
(C) Expand
(D) Do not change
Answer: (B) Contract

Q33. A rainbow forms due to:
(A) Reflection + refraction + dispersion
(B) Refraction + dispersion + internal reflection
(C) Dispersion + scattering + reflection
(D) Refraction + scattering
Answer: (B) Refraction, dispersion, internal reflection

Q34. The part that controls the amount of light entering the eye is:
(A) Iris
(B) Cornea
(C) Pupil
(D) Ciliary muscles
Answer: (C) Pupil

Q35. Hypermetropic eye forms image:
(A) In front of retina
(B) On retina
(C) Behind retina
(D) On cornea
Answer: (C) Behind retina

Q36. People with which condition CAN donate eyes?
(A) AIDS
(B) Hepatitis B
(C) Tetanus
(D) Asthma
Answer: (D) Asthma

Q37. A person with myopia has image formed:
(A) On retina
(B) Behind retina
(C) In front of retina
(D) At blind spot
Answer: (C) In front of retina

Q38. The membrane through which light enters the eye is:
(A) Lens
(B) Cornea
(C) Retina
(D) Iris
Answer: (B) Cornea

Q39. The total increase in day length due to refraction is:
(A) 2 min
(B) 4 min
(C) 5 min
(D) 10 min
Answer: (B) 4 minutes

Q40. Which scientist first used prism for spectrum?
(A) Einstein
(B) Isaac Newton
(C) Galileo
(D) C.V. Raman
Answer: (B) Isaac Newton

Q41. The pupil size is regulated by the:
(A) Cornea
(B) Retina
(C) Iris
(D) Lens
Answer: (C) Iris

Q42. Which lens corrects myopia?
(A) Convex
(B) Concave
(C) Bifocal
(D) Cylindrical
Answer: (B) Concave lens

Q43. The image of an object is formed on:
(A) Cornea
(B) Iris
(C) Pupil
(D) Retina
Answer: (D) Retina

Q44. The angle between faces of prism is:
(A) Incident angle
(B) Deviation angle
(C) Prism angle
(D) Emergence angle
Answer: (C) Angle of prism

Q45. One pair of eyes can give vision to how many people?
(A) 1
(B) 2
(C) 3
(D) 4
Answer: (D) 4

Q46. If Earth had no atmosphere, the sky would appear:
(A) Blue
(B) Red
(C) White
(D) Dark
Answer: (D) Dark

Q47. Ciliary muscles relaxed makes lens:
(A) Thin; focal length increases
(B) Thick; focal length decreases
(C) Thin; focal length decreases
(D) Thick; focal length increases
Answer: (A) Thin; focal length increases

Q48. Optic nerves carry signals to:
(A) Ciliary muscles
(B) Brain
(C) Iris
(D) Cornea
Answer: (B) Brain

Q49. The apparent flattening of Sun at sunset is due to:
(A) Dispersion
(B) Scattering
(C) Atmospheric refraction
(D) Tyndall effect
Answer: (C) Atmospheric refraction

Q50. The splitting of sunlight into colours is called:
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Scattering
Answer: (C) Dispersion