Science Practice Quiz 95

Q1.What is the approximate diameter of the human eyeball?

A. 1.5 cm B. 2.3 cm C. 3.0 cm D. 2.8 cm

Q2.Where does most of the refraction for light rays entering the human eye occur?

A. At the crystalline lens B. At the outer surface of the cornea C. At the iris D. At the pupil

Q3.Which part of the human eye provides the finer adjustment of focal length required to focus objects at different distances on the retina?

A. Cornea B. Iris C. Crystalline lens D. Pupil

Q4.What is the function of the iris in the human eye?

A. To form images on the retina B. To allow light to enter the eye C. To control the size of the pupil D. To provide finer adjustment of focal length

Q5.Which part of the human eye regulates and controls the amount of light entering it?

A. Cornea B. Retina C. Pupil D. Crystalline lens

Q6.To what common device is the human eye compared in the provided text?

A. A telescope B. A microscope C. A camera D. A projector

Q7.What structure forms the transparent bulge on the front surface of the human eyeball?

A. Iris B. Pupil C. Retina D. Cornea

Q8.Among all sense organs, why is the human eye considered the most significant one?

A. It helps in identifying objects by smell B. It enables us to hear sounds clearly C. It allows us to see the beautiful, colourful world D. It helps in identifying objects by touch

Q9.What type of image is formed by the eye lens on the retina?

A. An inverted real image B. An upright virtual image C. An inverted virtual image D. An upright real image

Q10.What is the retina described as in the human eye?

A. A thick, opaque membrane with nerve endings B. A delicate membrane having enormous number of light-sensitive cells C. A muscular structure controlling lens curvature D. A transparent layer covering the front of the eye

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Science Practice Quiz 95