Solving the Human Eye and Colourful World Multiple Choice Questions of Class 10 Science Chapter 11 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Human Eye and Colourful World Class 10 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 11 Science Class 10 and cross-check your answers during preparation.

Question 1.
ssertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of optic nerve and retina in the eye.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

(a) Both A and R are true and R is the correct explanation of A.

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Question 2.
The defect of the eye in which the eyeball becomes too long is
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) cataract

Answer

(a) myopia

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Question 3.
What type of image is formed by the eye lens on the retina?
(a) Real and erect
(b) Virtual and inverted
(c) Real and inverted
(d) Virtual and erect

Answer

(c) Real and inverted

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Question 4.
The amount of light entering the eye can be controlled by the
(a) iris
(b) pupil
(c) cornea
(d) ciliary muscles

Answer

(b) pupil

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Question 5.
At noon, the Sun appears white as
(a) blue colour is scattered the most
(b) red colour is scattered the most
(c) light is least scattered
(d) all the colours of the white light are scattered away

Answer

(c) light is least scattered

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Question 6.
Twinkling of stars is due to
(a) reflection of light by clouds
(b) scattering of light by dust particles
(c) dispersion of light by water drops
(d) atmospheric refraction of starlight

Answer

(d) atmospheric refraction of starlight

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Question 7.
The splitting of white light into different colours on passing through a prism is called
(a) reflection
(b) refraction
(c) dispersion
(d) deviation

Answer

(c) dispersion

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Question 8.
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
(a) + 0.5 D
(b) – 0.5 D
(c) + 0.2 D
(d) – 0.2 D

Answer

(b) – 0.5 D

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Question 9.
The clear sky appears blue because
(a) blue light gets absorbed in the atmosphere.
(b) ultraviolet radiations are absorbed in the atmosphere.
(c) violet and blue lights get scattered more than lights of all other colours by the atmosphere.
(d) light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.

Answer

(c) violet and blue lights get scattered more than lights of all other colours by the atmosphere.

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Question 10.
One cannot see through the fog, because
(a) refractive index of the fog is very high
(b) light suffers total reflection at droplets
(c) fog absorbs light
(d) light is scattered by the droplets

Answer

(d) light is scattered by the droplets

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Question 11.
Refraction of light by the earth’s atmosphere due to variation in air density is called
(a) atmospheric reflection
(b) atmospheric dispersion
(c) atmospheric scattering
(d) atmospheric refraction

Answer

(d) atmospheric refraction

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Question 12.
The deflection of light by minute particles and molecules of the atmosphere in all direction is called …………………….. of light.
(a) dispersion
(b) scattering
(c) interference
(d) tyndell effect

Answer

(c) interference

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Question 13.
The air layer of atmosphere whose temperature is less then the hot layer behave as optically
(a) denser medium
(b) rarer medium
(c) inactive medium
(d) either denser or rarer medium

Answer

(a) denser medium

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Question 14.
The focal length of the eye lens increases when eye muscles.
(a) are relaxed and lens becomes thinner
(b) contract and lens becomes thicker
(c) are relaxed and lens becomes thicker
(d) Contract and lens becomes thinner.

Answer

(a) are relaxed and lens becomes thinner

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Question 15.
The colour that is scattered the least by the tiny particles and the atoms/ molecules of the atmosphere is
(a) Violet
(b) Green
(c) yellow
(d) Red

Answer

(d) Red

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Question 16.
The image formed on the retina of the human eye is
(a) virtual and inverted
(b) real and inverted
(c) real and erect
(d) virtual and erect

Answer

(b) real and inverted

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Question 17.
When a person is myopic, he/ she can clearly see
(a) both nearby and far off objects
(b) Only nearby objects
(c) only far off objects
(d) Neither nearby nor far off objects

Answer

(b) Only nearby objects

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Question 18.
The defect of vision in which the person is able to see distant object distinctly but cannot see nearby objects clearly is called
(a) Long-sightedness
(b) Far-sightedness
(c) Hypermetropia
(d) All of the above

Answer

(d) All of the above

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Question 19.
The defect of myopia can be corrected by using
(a) Concave lens
(b) Convex lens
(c) Either concave or convex
(d) A complicated combination of lenses.

Answer

(a) Concave lens

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Question 20.
Which of the following phenomenon contributes significantly to the reddish appearance of the sun at sunrise or sunset?
(a) Dispersion of light
(b) Scattering of light
(c) Total internal Reflection
(d) Reflection of light from the earth

Answer

(b) Scattering of light

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Question 21.
Assertion: Concave mirrors are used as reflectors in torches, vehicle head-lights and in search lights.
Reason: When an object is placed beyond the centre of curvature of a concave mirror, the image formed is real and inverted.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

(b) Both A and R are true but R is not the correct explanation of A.

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Question 22.
Assertion: The near-point of a hypermetropic eye is more than 25 cm away.
Reason: Hypermetropia is corrected using spectacles containing concave lenses.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
(e) Both A and R are false.

Answer

(c) A is true but R is false.

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Question 23.
Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
(a) Twinkling of stars
(b) Stars seem higher than they actually are
(c) Advanced sunrise and delayed sunset
(d) Rainbow

Answer

(d) Rainbow

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Question 24.
The medical condition in which the lens of the eye of a person becomes progressively cloudy resulting in blurred vision is called
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) cataract

Answer

(d) cataract

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Question 25.
The least distance of distinct vision for a normal eye is
(a) infinity
(b) 25 cm
(c) 2.5 cm
(d) 25 m

Answer

(b) 25 cm

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Question 26.
The defect of vision in which a person cannot see the distant objects clearly but can see nearby objects clearly is called
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) bifocal eye

Answer

(a) myopia

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Question 27.
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power
(a) + 0.5 D
(b) – 0.5 D
(c) + 0.2 D
(d) – 0.2 D

Answer

(b) -0.5 D

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Question 28.
Near and far points of a young person normal eye respectively are
(a) 0 and infinity
(b) 0 and 25 cm
(c) 25 cm and infinity
(d) 25 cm and 150 cm.

Answer

(c) 25 cm and infinity

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Question 29.
Twinkling of stars is due to atmospheric
(a) dispersion of light by water droplets
(b) refraction of light by different layers of varying refractive indices
(c) scattering of light by dust particles
(d) internal reflection of light by clouds.

Answer

(b) refraction of light by different layers of varying refractive indices

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Question 30.
The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light
(a) is scattered the most by smoke or fog
(b) is scattered the least by smoke or fog
(b) is absorbed the most by smoke or fog
(c) moves fastest in air

Answer

(b) is scattered the least by smoke or fog

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Question 31.
When white light enters a prism, it gets split into its constituent colours. This is due to
(a) different refractive index for different wavelength of each colour
(b) each colours has same velocity in the prism.
(c) prism material have high density.
(d) Scattering of light

Answer

(a) different refractive index for different wavelength of each colour

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Question 32.
The change in focal length of an eye lens is caused by the action of the
(a) Pupil
(b) Retina
(c) Cilliary muscles
(d) Iris

Answer

(c) Cilliary muscles

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Question 33.
The human eye forms the image of an object at its
(a) Cornea
(b) Iris
(c) Pupil
(d) Retina

Answer

(d) Retina

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Question 34.
The least distance of distinct vision for an eye lens is caused by the action of the
(a) 25 m
(b) 2.5 cm
(c) 25 cm
(d) 2.5 m

Answer

(c) 25 cm

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Question 35.
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
(a) Presbyopia
(b) Accommodation
(c) Near-sightedness
(d) Far-sightedness

Answer

(b) Accommodation

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Question 36.
Bi-focal lens are required to correct
(a) astigmatism
(b) coma
(c) myopia
(d) presbyopia

Answer

(d) presbyopia

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Question 37.
The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called
(a) Power of observation of the eye
(b) Power of adjustment of the eye
(c) Power of accommodation of the eye
(d) Power of enabling of the eye

Answer

(c) Power of accommodation of the eye

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Question 38.
Myopia and hypermetropia can be corrected by
(a) Concave and plano-convex lens
(b) Concave and convex lens
(c) Convex and concave lens
(d) Plano-concave lens for both defects.

Answer

(b) Concave and convex lens

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Question 39.
The muscular diaphragm that controls the size of the pupil is
(a) cornea
(b) ciliary muscles
(c) iris
(d) retina

Answer

(c) iris

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Question 40.
The black opening between the aqueous humour and the lens is called
(a) retina
(b) iris
(c) cornea
(d) pupil

Answer

(d) pupil

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