📌 How to Use
First read the questions carefully using the Read section. Use the Details button to understand concepts clearly. After completing reading, click Practice Quiz to test yourself.
📘 Study MCQs
Q1. The human eye enables us to see objects. NCERT 2023
• Seeing
• Hearing
• Smelling
• Tasting
Answer: Seeing
The human eye is the sense organ responsible for vision.
Light reflected from objects enters the eye and forms an image on the retina.
The optic nerve carries these signals to the brain, allowing us to see.
Q2. The part of the eye that controls the amount of light entering is called the: NCERT 2023
• Cornea
• Retina
• Iris
• Lens
Answer: Iris
The iris is the colored part of the eye.
It has a small opening called the pupil.
The iris expands or contracts to adjust the size of the pupil and control the amount of light entering the eye.
Q3. The image formed on the retina of the human eye is: NCERT 2023
• Upright and magnified
• Inverted and real
• Upright and virtual
• Inverted and virtual
Answer: Inverted and real
The eye lens forms a real and inverted image on the retina.
The brain interprets this image as upright.
This is similar to how a camera lens forms an inverted image on the film.
Q4. The defect of vision in which a person cannot see distant objects clearly is called: NCERT 2023
• Myopia
• Hypermetropia
• Cataract
• Presbyopia
Answer: Myopia
Myopia, also known as nearsightedness, occurs when the eyeball is too long or the lens is too curved.
Distant objects appear blurred because the image forms in front of the retina.
It is corrected using a concave lens.
Q5. The defect of vision in which a person cannot see nearby objects clearly is called: NCERT 2023
• Myopia
• Hypermetropia
• Cataract
• Glaucoma
Answer: Hypermetropia
Hypermetropia, also known as farsightedness, occurs when the eyeball is too short or the lens is too flat.
Nearby objects appear blurred because the image forms behind the retina.
It is corrected using a convex lens.
Q6. The blind spot in the human eye is a region where: NCERT 2023
• Vision is sharpest
• No image is formed
• Color vision is best
• Light is maximum
Answer: No image is formed
The blind spot is the point where the optic nerve leaves the eye.
This area has no photoreceptor cells (rods or cones).
Therefore, no image is formed at this spot.
Q7. The part of the eye that contains photoreceptor cells (rods and cones) is the: NCERT 2023
• Cornea
• Lens
• Retina
• Iris
Answer: Retina
The retina is the light-sensitive layer at the back of the eye.
It contains rod cells (for dim light) and cone cells (for color vision).
When light falls on these cells, they generate electrical signals that are sent to the brain.
Q8. The ability of the eye lens to adjust its focal length to see objects at different distances is called: NCERT 2023
• Refraction
• Accommodation
• Dispersion
• Reflection
Answer: Accommodation
Accommodation is the process by which the ciliary muscles change the shape of the eye lens.
For distant objects, the lens becomes thinner.
For nearby objects, the lens becomes thicker.
This allows clear focusing at various distances.
Q9. The transparent front part of the eye that covers the iris and pupil is the: NCERT 2023
• Sclera
• Retina
• Cornea
• Lens
Answer: Cornea
The cornea is the transparent, dome-shaped outermost layer of the eye.
It helps focus light as it enters the eye.
It also protects the inner structures of the eye.
Q10. The persistence of vision is the phenomenon that allows us to: NCERT 2023
• See colors clearly
• See moving images in a movie
• See in dim light
• See distant objects
Answer: See moving images in a movie
Persistence of vision is the ability of the eye to retain an image for about 1/16th of a second after the object is removed.
This property allows us to see a sequence of still images as continuous motion in movies and animations.