Science Practice Quiz 96

Q1.How are electrical signals generated by light-sensitive cells in the retina transmitted to the brain?

A. Through the ciliary muscles B. Via the optic nerves C. Directly by the eye lens D. Through the vitreous humor

Q2.What material is the eye lens composed of, and which muscles modify its curvature?

A. A cartilaginous, fluid-filled material; iris muscles B. A fibrous, jelly-like material; ciliary muscles C. A bony, rigid material; extrinsic eye muscles D. A transparent, crystalline material; pupil muscles

Q3.What happens to the eye lens and its focal length when ciliary muscles are relaxed?

A. The lens becomes thicker, and its focal length decreases. B. The lens becomes thinner, and its focal length increases. C. The lens curvature increases, and its focal length remains constant. D. The lens curvature decreases, and its focal length decreases.

Q4.What is the ability of the eye lens to adjust its focal length called?

A. Refraction B. Dispersion C. Accommodation D. Convergence

Q5.What is the minimum distance, at which objects can be seen most distinctly without strain, called for a young adult with normal vision?

A. The far point, which is infinity B. The least distance of distinct vision, which is about 25 cm C. The focal length of the eye lens, which is variable D. The point of convergence, which is about 50 cm

Q6.For a normal eye, what is the farthest point upto which objects can be seen clearly?

A. About 25 cm B. About 1 meter C. Infinity D. Limited by the power of accommodation

Q7.What is the condition called when the crystalline lens of people at old age becomes milky and cloudy?

A. Myopia B. Hypermetropia C. Cataract D. Presbyopia

Q8.What is a consequence of cataract, and how can vision be restored?

A. It causes increased focal length; corrected by spectacles. B. It causes partial or complete loss of vision; restored through cataract surgery. C. It causes near-sightedness; corrected by concave lenses. D. It causes eye strain; relieved by eye drops.

Q9.Which of the following are listed as common refractive defects of vision in the provided text?

A. Astigmatism, Glaucoma, Conjunctivitis B. Myopia, Hypermetropia, Presbyopia C. Cataract, Night Blindness, Colour Blindness D. Strabismus, Nystagmus, Keratoconus

Q10.How can the common refractive defects of vision like myopia, hypermetropia, and presbyopia be corrected?

A. Through eye exercises and dietary changes B. By the use of suitable spherical lenses C. With laser surgery only D. By increasing the power of accommodation naturally

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Science Practice Quiz 96