1️⃣ Which part of the human eye controls the amount of light entering the eye? 👁️
- A. Retina
- B. Iris
- C. Cornea
- D. Lens
Show Answer 🔽
✅ B. Iris
2️⃣ The human eye forms the image of an object at its: 📍
- A. Cornea
- B. Iris
- C. Retina
- D. Lens
Show Answer 🔽
✅ C. Retina
3️⃣ The minimum distance at which the eye can see objects clearly is called: 🔎
- A. Focal length
- B. Range of vision
- C. Least distance of distinct vision
- D. Far point
Show Answer 🔽
✅ C. Least distance of distinct vision
4️⃣ The least distance of distinct vision for a normal human eye is: 📏
- A. 15 cm
- B. 20 cm
- C. 25 cm
- D. 50 cm
Show Answer 🔽
✅ C. 25 cm
5️⃣ What causes the eye lens to become thin and flat? 👓
- A. Ciliary muscles relax
- B. Iris contracts
- C. Retina pulls it
- D. Light pressure
Show Answer 🔽
✅ A. Ciliary muscles relax
6️⃣ Which defect of vision is also known as nearsightedness? 👀
- A. Hypermetropia
- B. Presbyopia
- C. Astigmatism
- D. Myopia
Show Answer 🔽
✅ D. Myopia
7️⃣ The rainbow is caused due to: 🌈
- A. Reflection and dispersion
- B. Dispersion and total internal reflection
- C. Refraction and dispersion
- D. Diffraction and interference
Show Answer 🔽
✅ B. Dispersion and total internal reflection
8️⃣ Which color bends the most during dispersion? 🌈
- A. Red
- B. Green
- C. Violet
- D. Blue
Show Answer 🔽
✅ C. Violet
9️⃣ The splitting of white light into its component colors is called: 🔦
- A. Refraction
- B. Reflection
- C. Scattering
- D. Dispersion
Show Answer 🔽
✅ D. Dispersion
🔟 Which phenomenon causes the sky to appear blue? 🔵
- A. Reflection
- B. Refraction
- C. Dispersion
- D. Scattering
Show Answer 🔽
✅ D. Scattering
1️⃣1️⃣ What type of lens is used to correct myopia? 👓
- A. Convex lens
- B. Concave lens
- C. Bifocal lens
- D. Plano-convex lens
Show Answer 🔽
✅ B. Concave lens
1️⃣2️⃣ What type of lens is used to correct hypermetropia? 🔍
- A. Concave lens
- B. Convex lens
- C. Cylindrical lens
- D. Plano-concave lens
Show Answer 🔽
✅ B. Convex lens
1️⃣3️⃣ Which defect of vision occurs due to the weakening of ciliary muscles in old age? 👴
- A. Myopia
- B. Hypermetropia
- C. Astigmatism
- D. Presbyopia
Show Answer 🔽
✅ D. Presbyopia
1️⃣4️⃣ What is the cause of scattering of light? ☁️
- A. Reflection from mirror
- B. Refraction through lens
- C. Interaction of light with particles in the atmosphere
- D. Absorption of light by air
Show Answer 🔽
✅ C. Interaction of light with particles in the atmosphere
1️⃣5️⃣ What causes the red color of the sun at sunrise and sunset? 🌅
- A. Reflection of red light
- B. Refraction of red light
- C. Dispersion of red light
- D. Scattering of shorter wavelengths, leaving red
Show Answer 🔽
✅ D. Scattering of shorter wavelengths, leaving red
1️⃣6️⃣ What phenomenon is responsible for the twinkling of stars? ✨
- A. Reflection
- B. Refraction
- C. Dispersion
- D. Atmospheric refraction
Show Answer 🔽
✅ D. Atmospheric refraction
1️⃣7️⃣ Which cells of the retina are sensitive to bright light and color? 🌈
- A. Rod cells
- B. Cone cells
- C. Pigment cells
- D. Nerve cells
Show Answer 🔽
✅ B. Cone cells
1️⃣8️⃣ The bluish color of water in deep sea is due to: 🌊
- A. Reflection of sky
- B. Scattering of blue light
- C. Refraction of sunlight
- D. Absorption of green light
Show Answer 🔽
✅ B. Scattering of blue light
1️⃣9️⃣ In dispersion of white light through a prism, which color deviates the least? 📐
- A. Violet
- B. Indigo
- C. Red
- D. Blue
Show Answer 🔽
✅ C. Red
2️⃣0️⃣ What is the shape of the eye lens? 🔵
- A. Concave
- B. Convex
- C. Cylindrical
- D. Flat
Show Answer 🔽
✅ B. Convex
2️⃣1️⃣ Which part of the eye helps in changing the focal length? ⚙️
- A. Retina
- B. Iris
- C. Ciliary muscles
- D. Cornea
Show Answer 🔽
✅ C. Ciliary muscles
2️⃣2️⃣ What is the far point of a normal human eye? 🔭
- A. 100 m
- B. 25 cm
- C. 6 m
- D. Infinity
Show Answer 🔽
✅ D. Infinity
2️⃣3️⃣ Atmospheric refraction is responsible for: ☁️👀
- A. Blue sky
- B. Twinkling stars
- C. Red sun
- D. Rainbows
Show Answer 🔽
✅ B. Twinkling stars
2️⃣4️⃣ Which defect can be corrected by bifocal lens? 👓
- A. Myopia
- B. Hypermetropia
- C. Presbyopia
- D. Astigmatism
Show Answer 🔽
✅ C. Presbyopia
2️⃣5️⃣ Which phenomenon causes advanced sunrise and delayed sunset? 🌇
- A. Refraction of light
- B. Scattering of light
- C. Reflection of light
- D. Total internal reflection
Show Answer 🔽
✅ A. Refraction of light
2️⃣6️⃣ Which lens can converge light rays to a point? 🔆
- A. Concave lens
- B. Convex lens
- C. Cylindrical lens
- D. Plano-concave lens
Show Answer 🔽
✅ B. Convex lens
2️⃣7️⃣ Which color of light has the shortest wavelength? 🌈
- A. Red
- B. Green
- C. Yellow
- D. Violet
Show Answer 🔽
✅ D. Violet
2️⃣8️⃣ The eye lens is made of: 🧠
- A. Glass
- B. Cartilage
- C. Muscles
- D. Transparent, flexible proteins
Show Answer 🔽
✅ D. Transparent, flexible proteins
2️⃣9️⃣ Which part of the eye acts like a camera shutter? 📸
- A. Retina
- B. Iris
- C. Pupil
- D. Cornea
Show Answer 🔽
✅ B. Iris
3️⃣0️⃣ What is the power of accommodation of the human eye? 🔍
- A. Ability to control light
- B. Ability to adjust focal length
- C. Power of pupil
- D. Ability to change eye color
Show Answer 🔽
✅ B. Ability to adjust focal length
3️⃣1️⃣ What happens to the pupil in bright light? 💡
- A. It dilates
- B. It contracts
- C. It disappears
- D. It turns white
Show Answer 🔽
✅ B. It contracts
3️⃣2️⃣ What allows the eye lens to change its shape? 🔄
- A. Retina
- B. Cornea
- C. Ciliary muscles
- D. Iris
Show Answer 🔽
✅ C. Ciliary muscles
3️⃣3️⃣ Why does the sky appear dark from the moon? 🌑
- A. No atmosphere for scattering
- B. Thick dust clouds
- C. High gravity absorbs light
- D. Total internal reflection
Show Answer 🔽
✅ A. No atmosphere for scattering
3️⃣4️⃣ What is responsible for the formation of a rainbow? 🌈
- A. Reflection and scattering
- B. Refraction and dispersion
- C. Dispersion and total internal reflection
- D. Only reflection
Show Answer 🔽
✅ C. Dispersion and total internal reflection
3️⃣5️⃣ What is the role of rods in the human eye? 👁️
- A. Detect bright light
- B. Detect color
- C. Detect dim light
- D. Form the lens
Show Answer 🔽
✅ C. Detect dim light
3️⃣6️⃣ Which defect is caused when the eyeball is too long? 🧠
- A. Hypermetropia
- B. Presbyopia
- C. Myopia
- D. Astigmatism
Show Answer 🔽
✅ C. Myopia
3️⃣7️⃣ What causes dispersion of light through a prism? 🔺
- A. Different colors reflect at different angles
- B. Different refractive indices for different colors
- C. Air particles deflecting light
- D. Absorption of light
Show Answer 🔽
✅ B. Different refractive indices for different colors
3️⃣8️⃣ The eye lens is thicker at the center and thinner at the edges. It is a: 🔍
- A. Concave lens
- B. Convex lens
- C. Cylindrical lens
- D. Plano-convex lens
Show Answer 🔽
✅ B. Convex lens
3️⃣9️⃣ Which cells are responsible for color vision? 🎨
- A. Rod cells
- B. Cone cells
- C. Blood cells
- D. Nerve cells
Show Answer 🔽
✅ B. Cone cells
4️⃣0️⃣ What is the function of the iris? 🎯
- A. Forms image
- B. Controls light entering the eye
- C. Sends signals to the brain
- D. Helps with balance
Show Answer 🔽
✅ B. Controls light entering the eye
4️⃣1️⃣ Why do distant stars twinkle at night? ✨
- A. Due to internal vibration of stars
- B. Due to changing position of Earth
- C. Due to atmospheric refraction
- D. Due to reflection from clouds
Show Answer 🔽
✅ C. Due to atmospheric refraction
4️⃣2️⃣ What is the function of the retina? 🎥
- A. Focuses light
- B. Protects the eye
- C. Detects light and sends signals to brain
- D. Changes shape
Show Answer 🔽
✅ C. Detects light and sends signals to brain
4️⃣3️⃣ What makes the sun appear reddish at sunrise and sunset? 🌇
- A. Dispersion of light
- B. More scattering of blue light
- C. Reflection by clouds
- D. Absorption of red light
Show Answer 🔽
✅ B. More scattering of blue light
4️⃣4️⃣ The defect where both near and far objects appear blurry is: 👓
- A. Myopia
- B. Hypermetropia
- C. Presbyopia
- D. Astigmatism
Show Answer 🔽
✅ D. Astigmatism
4️⃣5️⃣ The rainbow appears after rain because of: 🌧️🌈
- A. Refraction
- B. Reflection
- C. Scattering
- D. Dispersion and internal reflection
Show Answer 🔽
✅ D. Dispersion and internal reflection
4️⃣6️⃣ Blue color of sky is due to: 🔵
- A. Reflection of sea water
- B. Dispersion
- C. Refraction
- D. Scattering of sunlight
Show Answer 🔽
✅ D. Scattering of sunlight
4️⃣7️⃣ Which light is scattered the most? 🌈
- A. Red
- B. Yellow
- C. Blue
- D. Violet
Show Answer 🔽
✅ D. Violet
4️⃣8️⃣ Which part of the eye controls the size of the pupil? 🧿
- A. Retina
- B. Iris
- C. Cornea
- D. Ciliary muscles
Show Answer 🔽
✅ B. Iris
4️⃣9️⃣ Which part of the eye is most sensitive to light? 💡
- A. Cornea
- B. Iris
- C. Retina
- D. Lens
Show Answer 🔽
✅ C. Retina
5️⃣0️⃣ What is the normal range of vision for a human eye? 👀
- A. 10 cm to 1 m
- B. 25 cm to 6 m
- C. 25 cm to infinity
- D. 50 cm to 10 m
Show Answer 🔽
✅ C. 25 cm to infinity
5️⃣1️⃣ Which of the following is NOT a primary function of the human eye? ❌👁️
- A. Image formation
- B. Light absorption
- C. Digestion of food
- D. Perception of color
Show Answer 🔽
✅ C. Digestion of food
5️⃣2️⃣ What do you call the ability of the eye to focus on near and distant objects by adjusting its lens? 🔍
- A. Reflection
- B. Accommodation
- C. Dispersion
- D. Refraction
Show Answer 🔽
✅ B. Accommodation
5️⃣3️⃣ Which lens is used in spectacles for someone who has difficulty seeing distant objects? 👓
- A. Convex lens
- B. Concave lens
- C. Bifocal lens
- D. Cylindrical lens
Show Answer 🔽
✅ B. Concave lens
5️⃣4️⃣ Which defect of vision is corrected using a convex lens? ➕👓
- A. Myopia
- B. Hypermetropia
- C. Presbyopia
- D. Astigmatism
Show Answer 🔽
✅ B. Hypermetropia
5️⃣5️⃣ The band of seven colors formed due to dispersion is called: 🌈
- A. Light beam
- B. Prism line
- C. Spectrum
- D. Optical band
Show Answer 🔽
✅ C. Spectrum
5️⃣6️⃣ Which gas molecules scatter blue light more effectively? 💨
- A. Oxygen
- B. Nitrogen
- C. Carbon dioxide
- D. Hydrogen
Show Answer 🔽
✅ B. Nitrogen
5️⃣7️⃣ What is the angle between the incident and emergent rays in a prism when no dispersion takes place? 📐
- A. 0°
- B. 45°
- C. 90°
- D. Equal to angle of prism
Show Answer 🔽
✅ A. 0°
5️⃣8️⃣ In which direction does a rainbow appear in the sky relative to the sun? ☀️🌈
- A. Toward the sun
- B. Behind the sun
- C. Opposite the sun
- D. Above the sun
Show Answer 🔽
✅ C. Opposite the sun
5️⃣9️⃣ Which of the following is not related to eye defects? 🚫👁️
- A. Myopia
- B. Hypermetropia
- C. Dispersion
- D. Presbyopia
Show Answer 🔽
✅ C. Dispersion
6️⃣0️⃣ In which condition does the image form behind the retina? 🔙
- A. Myopia
- B. Hypermetropia
- C. Normal vision
- D. Astigmatism
Show Answer 🔽
✅ B. Hypermetropia
6️⃣1️⃣ Which phenomenon enables us to see the sun even before it rises? 🌄
- A. Reflection
- B. Refraction
- C. Dispersion
- D. Scattering
Show Answer 🔽
✅ B. Refraction
6️⃣2️⃣ Which defect of vision is due to uneven curvature of the cornea? ⚫
- A. Myopia
- B. Hypermetropia
- C. Presbyopia
- D. Astigmatism
Show Answer 🔽
✅ D. Astigmatism
6️⃣3️⃣ The splitting of light into its colors is called: 🔦
- A. Scattering
- B. Dispersion
- C. Refraction
- D. Reflection
Show Answer 🔽
✅ B. Dispersion
6️⃣4️⃣ Which natural phenomenon confirms that light is made up of seven colors? 🌈
- A. Rainfall
- B. Rainbow
- C. Thunderstorm
- D. Mirage
Show Answer 🔽
✅ B. Rainbow
6️⃣5️⃣ What causes red light to scatter the least? 🟥
- A. It has low speed
- B. It has a longer wavelength
- C. It has high energy
- D. It is absorbed quickly
Show Answer 🔽
✅ B. It has a longer wavelength
6️⃣6️⃣ Which color of the spectrum has the highest frequency? 📶
- A. Red
- B. Green
- C. Blue
- D. Violet
Show Answer 🔽
✅ D. Violet
6️⃣7️⃣ What is the unit of power of a lens? 🔍
- A. Meter
- B. Dioptre
- C. Hertz
- D. Watt
Show Answer 🔽
✅ B. Dioptre
6️⃣8️⃣ Which instrument is used to test defects of vision? 👓
- A. Microscope
- B. Telescope
- C. Phoropter
- D. Periscope
Show Answer 🔽
✅ C. Phoropter
6️⃣9️⃣ Why are danger signals red in color? 🚨
- A. It is the most energetic
- B. It is the fastest color
- C. It scatters the least and travels farther
- D. It reflects back quickly
Show Answer 🔽
✅ C. It scatters the least and travels farther
7️⃣0️⃣ What type of image is formed on the retina? 🖼️
- A. Virtual and erect
- B. Real and erect
- C. Virtual and inverted
- D. Real and inverted
Show Answer 🔽
✅ D. Real and inverted
7️⃣1️⃣ Which of the following is an example of a natural optical phenomenon? 🌈
- A. Rainbow
- B. Mirage
- C. Twinkling of stars
- D. All of the above
Show Answer 🔽
✅ D. All of the above
7️⃣2️⃣ What is the cause of mirage formation? 🔥🌫️
- A. Dispersion
- B. Scattering
- C. Reflection
- D. Total internal reflection
Show Answer 🔽
✅ D. Total internal reflection
7️⃣3️⃣ Which phenomenon explains why stars appear higher than their actual position? 🌠
- A. Reflection
- B. Refraction
- C. Dispersion
- D. Diffraction
Show Answer 🔽
✅ B. Refraction
7️⃣4️⃣ Which color is at the top of a rainbow? 🔴
- A. Violet
- B. Blue
- C. Green
- D. Red
Show Answer 🔽
✅ D. Red
7️⃣5️⃣ Which color is scattered the least in the atmosphere? 🟥
- A. Violet
- B. Blue
- C. Green
- D. Red
Show Answer 🔽
✅ D. Red
7️⃣6️⃣ The ability of the eye to adjust its focal length is called: ⚙️
- A. Accommodation
- B. Refraction
- C. Dispersion
- D. Adjustment
Show Answer 🔽
✅ A. Accommodation
7️⃣7️⃣ Which eye defect occurs due to the loss of flexibility of the lens in old age? 👴
- A. Myopia
- B. Hypermetropia
- C. Presbyopia
- D. Astigmatism
Show Answer 🔽
✅ C. Presbyopia
7️⃣8️⃣ Which device is used to examine the eye internally? 🔬
- A. Microscope
- B. Ophthalmoscope
- C. Telescope
- D. Endoscope
Show Answer 🔽
✅ B. Ophthalmoscope
7️⃣9️⃣ Which part of the eye detects light and converts it to electrical signals? ⚡
- A. Lens
- B. Retina
- C. Cornea
- D. Iris
Show Answer 🔽
✅ B. Retina
8️⃣0️⃣ What kind of image does a convex lens form on the retina? 👁️
- A. Virtual, erect
- B. Real, inverted
- C. Real, erect
- D. Virtual, inverted
Show Answer 🔽
✅ B. Real, inverted
8️⃣1️⃣ Which part of the human eye is transparent and dome-shaped? 🛑
- A. Retina
- B. Cornea
- C. Iris
- D. Lens
Show Answer 🔽
✅ B. Cornea
8️⃣2️⃣ The phenomenon responsible for the formation of mirage is: 🌫️
- A. Reflection
- B. Total internal reflection
- C. Refraction
- D. Scattering
Show Answer 🔽
✅ B. Total internal reflection
8️⃣3️⃣ What causes color blindness? 🎨🚫
- A. Deficiency of cone cells
- B. Deficiency of rod cells
- C. Damage to the retina
- D. Weak eye muscles
Show Answer 🔽
✅ A. Deficiency of cone cells
8️⃣4️⃣ What is the ideal power of a normal eye lens? 🔍
- A. 2 D
- B. 3 D
- C. 4 D
- D. Varies as per object distance
Show Answer 🔽
✅ D. Varies as per object distance
8️⃣5️⃣ Who can see nearby objects clearly but not distant ones? 👓
- A. Person with hypermetropia
- B. Person with presbyopia
- C. Person with myopia
- D. Person with astigmatism
Show Answer 🔽
✅ C. Person with myopia
8️⃣6️⃣ The prism causes white light to: 🔺
- A. Reflect
- B. Refract without change
- C. Split into component colors
- D. Absorb light
Show Answer 🔽
✅ C. Split into component colors
8️⃣7️⃣ The phenomenon of twinkling of stars is caused by: 🌟
- A. Diffraction
- B. Reflection
- C. Scattering
- D. Atmospheric refraction
Show Answer 🔽
✅ D. Atmospheric refraction
8️⃣8️⃣ Which device is used to observe the color spectrum? 🌈🔍
- A. Periscope
- B. Microscope
- C. Spectrometer
- D. Endoscope
Show Answer 🔽
✅ C. Spectrometer
8️⃣9️⃣ What happens when light enters the eye? 👁️💡
- A. It reflects on retina
- B. It bends and forms an image on retina
- C. It scatters inside the eye
- D. It disappears
Show Answer 🔽
✅ B. It bends and forms an image on retina
9️⃣0️⃣ Which part provides nutrition and oxygen to the eye? 💧
- A. Cornea
- B. Iris
- C. Aqueous humor
- D. Vitreous body
Show Answer 🔽
✅ C. Aqueous humor
9️⃣1️⃣ Which part of the eye is most sensitive to light? 💡
- A. Retina
- B. Cornea
- C. Iris
- D. Sclera
Show Answer 🔽
✅ A. Retina
9️⃣2️⃣ Which structure connects the eye to the brain? 🧠
- A. Retina
- B. Optic nerve
- C. Lens
- D. Iris
Show Answer 🔽
✅ B. Optic nerve
9️⃣3️⃣ What causes the formation of a double rainbow? 🌈🌈
- A. Double refraction
- B. Multiple internal reflections
- C. Strong sunlight
- D. High wind
Show Answer 🔽
✅ B. Multiple internal reflections
9️⃣4️⃣ What is the shape of the human eye lens? 🔍
- A. Flat
- B. Spherical
- C. Concave
- D. Convex
Show Answer 🔽
✅ D. Convex
9️⃣5️⃣ Why is the pupil black in color? ⚫
- A. It is filled with black fluid
- B. It is a hole with no light reflected back
- C. It has black pigment
- D. It absorbs UV rays
Show Answer 🔽
✅ B. It is a hole with no light reflected back
9️⃣6️⃣ Which eye defect can be caused by aging and requires bifocals? 👴👓
- A. Myopia
- B. Hypermetropia
- C. Presbyopia
- D. Astigmatism
Show Answer 🔽
✅ C. Presbyopia
9️⃣7️⃣ What causes the eye lens to become flat and thin for distant vision? 🏞️
- A. Ciliary muscles contract
- B. Ciliary muscles relax
- C. Retina stretches
- D. Iris expands
Show Answer 🔽
✅ B. Ciliary muscles relax
9️⃣8️⃣ What is the function of aqueous humor? 💦
- A. Image formation
- B. Color perception
- C. Nourishment and pressure maintenance
- D. Light refraction only
Show Answer 🔽
✅ C. Nourishment and pressure maintenance
9️⃣9️⃣ Why do objects appear blurry in astigmatism? 👓
- A. Flat retina
- B. Lens displacement
- C. Uneven curvature of cornea
- D. Absence of iris
Show Answer 🔽
✅ C. Uneven curvature of cornea
1️⃣0️⃣0️⃣ Which of these is a symptom of hypermetropia? 🔭
- A. Blurry near vision
- B. Blurry distant vision
- C. Double vision
- D. Night blindness
Show Answer 🔽
✅ A. Blurry near vision