# MCQs for Class 10 Science Chapter 11 The Human Eye and Colorful World

MCQs for Class 10 Science Chapter 11 The Human Eye and Colorful World: In this article, we have covered all the important MCQs for Free for Class 10 Term 1 2021-22 Board Exams. In accordance with the latest pattern, Padhle is here with MCQ Questions for Class 10.

# Class 10 for MCQ Science Chapter 11 The Human Eye and Colorful World

Question 1:
The muscular diaphragm that controls the size of the pupil is
(a) cornea
(b) ciliary muscles
(c) iris
(d) retina

Question 2:
The blue color of the sky is due to:
(a) refraction of light
(b) dispersion of light
(c) diffraction of light
(d) scattering of light

Answer : (d) scattering of light

Question 3:
Having two eyes facilitates in
A: Increasing the field of view
B: Bringing a three-dimensional view
C: Developing the concept of distance/ size
Then the correct option is/are
(a) A only
(b) A and B only
(c) B only
(d) A, B, and C

Answer : (d) A, B, and C

Question 4:
Due to the atmospheric refraction of sunlight, the time from sunrise to sunset is lengthened by about:
(a) 6 minutes
(b) 2 minutes
(c) 4 minutes
(d) 5 minutes

Question 5:
The atmospheric refraction of light causes the twinkling of:
(a) planets only
(b) stars only
(c) planets and stars
(d) stars and satellites

Question 6:
The black opening between the aqueous humor and the lens is called
(a) retina
(b) iris
(c) cornea
(d) pupil

Question 7:
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

Question 8:
The twinkling of stars is due to the atmosphere:
(a) reflection of light
(b) dispersion of light
(c) interference of light
(d) refraction of light

Answer : (d) refraction of light

Question 9:
Which of the following color of white light has the maximum wavelength?
(a) red
(b) orange
(c) violet
(d) blue

Question 10:
The defect of vision in which the person is able to see a distant objects distinctly but cannot see nearby objects clearly is called
(a) Long-sightedness
(b) Far-sightedness
(c) Hypermetropia
(d) All above

Question 11:
Myopia and hypermetropia can be corrected by
(a) Concave and a 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

Question 12:
Which of the following color of white light has the least wavelength?
(a) red
(b) orange
(c) violet
(d) blue

Question 13:
Bi-focal lenses are required to correct
(a) astigmatism
(b) coma
(c) myopia
(d) presbyopia

Question 14:
The splitting up of white light into seven colors on passing through a glass prism is called:
(a) refraction
(b) deflection
(c) dispersion
(d) scattering

Question 15:
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

Question 16:
The animals of prey have:
(a) two eyes at the front
(b) two eyes at the back
(c) two eyes on the sides
(d) one eye at the front and one on the side

Answer : (c) two eyes on the sides

Question 17:
When white light enters a prism, it gets split into its constituent colors. This is due to
(a) different refractive indexes for the different wavelengths of each color
(b) each color has the same velocity in the prism.
(c) prism material has a high density.
(d) Scattering of light

Answer : (a) different refractive indexes for the different wavelengths of each color

Question 18:
The animals called predators to have:
(a) both the eyes on the sides
(b) one eye on the side and one at the front
(c) one eye on the front and one at the back
(d) both the eyes at the front

Answer : (d) both the eyes at the front

Question 19:
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

Question 20:
Having two eyes gives a person:
(a) deeper field of view
(b) colored field of view
(c) rear field of view
(d) wider field of view

Answer : (d) wider field of view

Question 21:
The deflection of light by minute particles and molecules of the atmosphere in all directions is called ____________ of light.
(a) dispersion
(b) scattering
(c) interference
(d) Tyndall effect

Question 22:
With both eyes open, a person’s field of view is about:
(a) 90°
(b) 150°
(c) 180°
(d) 360°

Question 23:
One cannot see through the fog, because
(a) the 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

Question 24:
The animal which does not have eyes that look sideways is:
(a) Horse
(b) Chicken
(c) Lion
(d) Fish

Question 25:
A prism ABC (with BC as a base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in the figure. In which of the following cases, after dispersion, the third color from the top corresponds to the color of the sky?

Question 26:
At noon the sun appears white as
(a) light is least scattered
(b) all the colors of the white light are scattered away
(c) the blue color is scattered the most
(d) the red color is scattered the most

Answer : (a) light is least scattered

Question 27:
The 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

Question 28:
Perception of colors by the human eye is possible:
(a) at retina
(b) by rod-shaped cells of the retina
(c) cone-shaped cells of the retina
(d) by yellow spot.

Answer : (c) cone-shaped cells of the retina

Question 29:
The danger signals installed at the top of tall buildings are red in color. These can be easily seen from a distance because among all other colors, 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

Question 30:
A person uses a convex lens of focal length 20 cm in spectacles, the power of the lens will be:
(a) -5 D
(b) +5 D
(c) +2 D
(d) -2 D

Question 31:
Stars appear to be twinkling because of
(a) atmospheric refraction
(b) reflection
(c) Tyndall effect
(d) spectrum

Question 32:
Assertion: Concave mirrors are used as reflectors in torches, vehicle headlights, and searchlights.Reason: When an object is placed beyond the center 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.

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

Question 33:
A bifocal lens is used in
(a) myopia
(b) lever
(c) Cataract
(d) Presbyopia

Question 34:
The defect of the eye in which the eyeball becomes too long is
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) cataract

Question 35:
A person uses a convex lens of focal length 20 cm in spectacles, the power of the lens will be:
(a) -5 D
(b) +5 D
(c) +2 D
(d) -2 D

Question 36:
The splitting of light into its component colors is called
(a) Spectrum
(b) Dispersion
(c) Tyndall effect
(d) Refraction

Question 37:
The crystalline lens of people at old age becomes milky and cloudy. This condition is called
(a) myopia
(b) lever
(c) cataract
(d) presbyopia

Question 38:
The farthest point of a normal eye is
(a) 25 cm
(b) 50 cm
(c) 75 cm
(d) infinity

Question 39:
While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below.

The correct path of the rays has been shown by:
(a) I
(b) II
(c) III
(d) IV

Question 40:
The amount of light entering the eye can be controlled by the
(a) iris
(b) pupil
(c) cornea
(d) ciliary muscles

Question 41:
In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray:
(a) is parallel to the incident ray
(b) is perpendicular to the incident ray
(c) is parallel to the refracted ray
(d) bends at an angle to the direction of the incident ray

Answer : (d) bends at an angle to the direction of incident ray

Question 42:
Type of lens used in correction of hypermetropia
(a) concave lens
(b) reflecting lens
(c) bifocal lens
(d) convex lens

Question 43:
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

Question 44:
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

Question 45:
Type of lens used in correction of hypermetropia
(a) concave lens
(b) reflecting lens
(c) bifocal lens
(d) convex lens

Question 46:
Reason behind advance sunrise and delayed sunset
(a) atmospheric refraction
(b) total internal reflection
(c) dispersion
(d) reflection

Question 47:
The splitting of white light into its component colours is called
(a) refraction
(b) reflation
(c) dispersion
(d) tyndall effect

Question 48:
After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are:

(a) ∠i and ∠r
(b) ∠i and ∠e
(c) ∠i, ∠e and ∠D
(d) ∠i, ∠r and ∠e

Answer : (b) ∠i and ∠e

Question 49:
A student is observing the diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:
(а) towards the normal while entering into the prism and away from the normal while emerging out of the prism
(b) away from the normal while entering into the prism and towards the normal while emerging out of the prism.
(c) away from the normal while entering as well as while emerging out of the prism.
(d) towards the normal while entering as well as while emerging out of the prism.

Answer : (а) towards the normal while entering into the prism and away from the normal while emerging out of the prism

Question 50:
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

Question 51:
The splitting of white light into its component colours is called
(a) refraction
(b) reflation
(c) dispersion
(d) tyndall effect

Question 47:
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

Question 47:
The splitting of white light into its component colours is called
(a) refraction
(b) reflation
(c) dispersion
(d) tyndall effect

Question 47:
The splitting of white light into its component colours is called
(a) refraction
(b) reflation
(c) dispersion
(d) tyndall effect

Question 47:
The splitting of white light into its component colors is called
(a) refraction
(b) reflation
(c) dispersion
(d) Tyndall effect

Question 48:
After tracing the path of a ray of light through a glass prism a student marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e) and the angle of deviation (∠D) as shown in the diagram. The correctly marked angles are:

(a) ∠i and ∠r
(b) ∠i and ∠e
(c) ∠i, ∠e and ∠D
(d) ∠i, ∠r and ∠e

Answer : (b) ∠i and ∠e

Question 49:
A student is observing the diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends:
(а) towards the normal while entering into the prism and away from the normal while emerging out of the prism
(b) away from the normal while entering into the prism and towards the normal while emerging out of the prism.
(c) away from the normal while entering as well as while emerging out of the prism.
(d) towards the normal while entering as well as while emerging out of the prism.

Answer : (а) towards the normal while entering into the prism and away from the normal while emerging out of the prism

Question 50:
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

Question 51:
The splitting of white light into its component colours is called
(a) refraction
(b) reflation
(c) dispersion
(d) tyndall effect

Question 52:
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

Question 53:
A student traces the path of a ray through a glass prism for four different values of angle of incidence. On analysing the diagrams he is likely to conclude that the emergent ray
(a) is always parallel to the incident ray.
(b) is always perpendicular to the incident ray.
(c) is always parallel to the refracted ray.
(d) always bends at an angle to the direction of incident ray.

Answer : (d) always bends at an angle to the direction of incident ray.

Question 54:
Which of the following statement is correct?
(a) A person with myopia can see distant objects clearly.
(b) A person with hypermetropia can see nearby objects clearly.
(c) A person with myopia can see nearby objects clearly.
(d) A person with hypermetropia cannot see distant objects clearly.

Answer : (c) A person with myopia can see nearby objects clearly.

Question 55:
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