CBSE Class 10 The Human Eye and the Colourful World — practice questions
87 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 10 The Human Eye and the Colourful World in the app →The transparent front layer of the human eye is called the:The image of an object is formed on the:The least distance of distinct vision for a healthy adult human eye is about:Power of accommodation of the eye is the ability of the eye lens to:White light splits into its colours when passed through a prism. This phenomenon is called:The order of the colours of the visible spectrum, starting with the most refracted, is:Which defect of vision is corrected by a concave lens?Which defect of vision is corrected by a convex lens?In the human eye, the size of the pupil is controlled by the:What causes the twinkling of stars on a clear night?Why does the sky appear blue during the day?Why does the sun appear reddish at sunrise and sunset?A near-sighted person can see only objects nearer than:Power of a corrective lens is expressed in dioptres. One dioptre equals:Presbyopia is caused by:Which of the following causes night blindness?A person can read a book at 30 cm but cannot read it at 25 cm. The defect is:A myopic person uses a lens of focal length -1.5 m. The power of this lens is:The splitting of white light by a prism into colours is due to:Why does a hypermetropic eye have its near point farther than 25 cm?A myopic eye can be corrected by:The phenomenon of bending of light caused by gas density variations in the atmosphere is called:Why are danger signals such as stop lights and fire engines coloured red?Two convex lenses of focal lengths 20 cm and 50 cm are placed in contact. The power of the combination is:Which of the following causes the colour of the clear sky to appear blue at noon?The Tyndall effect refers to the:A boy can see distant objects clearly but cannot read his textbook held at 25 cm. He suffers from:Why do planets NOT twinkle though stars do?The bluish colour scattered toward the sides of a sunbeam is described by:A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of powerAt noon the sun appears white asWhich of the following phenomena of light are involved in the formation of a rainbow?Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or The bluish colour of water in deep sea is due toThe focal length of the eye lens increases when eye musclesThe light-sensitive layer at the back of the eyeball is the:Most of the refraction of light entering the eye occurs at the:The size of the pupil is controlled by the:The ability of the eye to focus on objects at different distances by adjusting the focal length of the lens isThe least distance of distinct vision for a young adult is approximately:The far point of a normal eye is:Myopia is corrected using a:Hypermetropia is corrected using a:Presbyopia arises because:A bifocal lens used for presbyopia + myopia has:A myopic person has a far point of 1 m. The focal length of the corrective concave lens is:A hypermetropic person has a near point of 1 m. The focal length of the corrective convex lens is:The splitting of white light into its constituent colours by a prism is called:The correct sequence of colours in a rainbow (top to bottom of the bow) is:Newton showed that white light can be reformed from the spectrum using:A rainbow always forms in the sky:The twinkling of stars is due to:Planets do not twinkle as much as stars because:The Sun appears reddish at sunrise and sunset because:The blue colour of the sky is best explained by:In a young eye, the focal length range of the eye lens is approximately:Why is the Sun visible 2 minutes before sunrise and 2 minutes after sunset?A person can see only objects between 0.5 m and 2 m clearly. Which lenses (in order: distance, near) should thInside a prism, violet light deviates more than red because:The phenomenon of dispersion was first scientifically demonstrated by:A converging lens of focal length 1 m corrects a myopic person's vision. Is this correct?Tyndall effect refers to:Power of accommodation cannot reduce the focal length below a certain value because:A myopic person's far point is 50 cm. The corrective lens has power:Cataract refers to:Why don't the planets twinkle but stars do?A 10-cm-tall object placed 30 cm in front of a 20-cm concave mirror has an image at:The eye lens is described as which type of biconvex structure?Why must we hold a book about 25 cm away to read it comfortably?Scattering of light is most pronounced when the wavelength of light is:The image formed on the retina by the human eye is:A child cannot read words on the blackboard clearly. The likely defect and correction are:The apparent flattening of the Sun's disc at sunset is due to:The part of the eye that focuses light onto the retina by changing its shape is the:The light-sensitive layer at the back of the eye, where the image forms, is the:The defect of vision in which a person cannot see DISTANT objects clearly is:Hypermetropia (far-sightedness) is corrected using:The least distance of distinct vision for a normal eye is approximately:Dispersion of white light by a prism produces a spectrum because:A rainbow is formed by:The sky appears BLUE because of:The reddish appearance of the sun at sunrise and sunset is due to:Twinkling of stars is caused by:An old man cannot read a book held close but can see distant scenes clearly. The defect and its cure are:Tyndall effect — the visible path of a beam of light through a colloid — is a result of:The ability of the eye to focus on objects at different distances is called:Light from a star changes colour during twinkling because: