Human Eye and Colorful World Quiz

Q1: The muscular diaphragm that controls the size of the pupil is

• cornea
• ciliary muscles
• iris
• retina

Q2: The blue color of the sky is due to:

• refraction of light
• dispersion of light
• diffraction of light
• scattering of light

Q3: 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 only
• A and B only
• B only
• A, B, and C

Q4: Due to the atmospheric refraction of sunlight, the time from sunrise to sunset is lengthened by about:

• 6 minutes
• 2 minutes
• 4 minutes
• 5 minutes

Q5: The atmospheric refraction of light causes the twinkling of:

• planets only
• stars only
• planets and stars
• stars and satellites

Q6: The black opening between the aqueous humor and the lens is called

• retina
• iris
• cornea
• pupil

Q7: Near and far points of a young person normal eye respectively are

• 0 and infinity
• 0 and 25 cm
• 25 cm and infinity
• 25 cm and 150 cm.

Q8: The twinkling of stars is due to the atmosphere:

• reflection of light
• dispersion of light
• interference of light
• refraction of light

Q9: Which of the following color of white light has the maximum wavelength?

• red
• orange
• violet
• blue

Q10: The defect of vision in which the person is able to see a distant objects distinctly but cannot see nearby objects clearly is called

• Long-sightedness
• Far-sightedness
• Hypermetropia
• All above

Q11: Myopia and hypermetropia can be corrected by

• Concave and a plano-convex lens
• Concave and convex lens
• Convex and concave lens
• Plano-concave lens for both defects.

Q12: Which of the following color of white light has the least wavelength?

• red
• orange
• violet
• blue

Q13: Bi-focal lenses are required to correct

• astigmatism
• coma
• myopia
• presbyopia

Q14: The splitting up of white light into seven colors on passing through a glass prism is called:

• refraction
• deflection
• dispersion
• scattering

Q15: The image formed on the retina of the human eye is

• virtual and inverted
• real and inverted
• real and erect
• virtual and erect

Q16: The animals of prey have:

• two eyes at the front
• two eyes at the back
• two eyes on the sides
• one eye at the front and one on the side

Q17: When white light enters a prism, it gets split into its constituent colors. This is due to

• different refractive indexes for the different wavelengths of each color
• each color has the same velocity in the prism.
• prism material has a high density.
• Scattering of light

Q18: The animals called predators to have:

• both the eyes on the sides
• one eye on the side and one at the front
• one eye on the front and one at the back
• both the eyes at the front

Q19: Refraction of light by the earth’s atmosphere due to variation in air density is called

• atmospheric reflection
• atmospheric dispersion
• atmospheric scattering
• atmospheric refraction

Q20: Having two eyes gives a person:

• deeper field of view
• colored field of view
• rear field of view
• wider field of view

Q21: The deflection of light by minute particles and molecules of the atmosphere in all directions is called ____________ of light.

• dispersion
• scattering
• interference
• Tyndall effect

Q22: With both eyes open, a person’s field of view is about:

• 90°
• 150°
• 180°
• 360°

Q23: One cannot see through the fog, because

• the refractive index of the fog is very high
• light suffers total reflection at droplets
• fog absorbs light
• light is scattered by the droplets

Q24: The animal which does not have eyes that look sideways is:

• Horse
• Chicken
• Lion
• Fish

Q25: At noon the sun appears white as

• light is least scattered
• all the colors of the white light are scattered away
• the blue color is scattered the most
• the red color is scattered the most

Q26: The twinkling of stars is due to atmospheric

• dispersion of light by water droplets
• refraction of light by different layers of varying refractive indices
• scattering of light by dust particles
• internal reflection of light by clouds.

Q27: Perception of colors by the human eye is possible:

• at retina
• by rod-shaped cells of the retina
• cone-shaped cells of the retina
• by yellow spot.

Q28: 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

• is scattered the most by smoke or fog
• is scattered the least by smoke or fog
• is absorbed the most by smoke or fog
• moves fastest in air

Q29: A person uses a convex lens of focal length 20 cm in spectacles, the power of the lens will be:

• -5 D
• +5 D
• +2 D
• -2 D

Q30: Stars appear to be twinkling because of

• atmospheric refraction
• reflection
• Tyndall effect
• spectrum

Q31: 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.

• Both A and R are true and R is the correct explanation of A.
• Both A and R are true but R is not the correct explanation of A.
• A is true but R is false.
• A is false but R is true.

Q32: A bifocal lens is used in

• myopia
• lever
• Cataract
• Presbyopia

Q33: The defect of the eye in which the eyeball becomes too long is

• myopia
• hypermetropia
• presbyopia
• cataract

Q34: A person uses a convex lens of focal length 20 cm in spectacles, the power of the lens will be:

• -5 D
• +5 D
• +2 D
• -2 D

Q35: The splitting of light into its component colors is called

• Spectrum
• Dispersion
• Tyndall effect
• Refraction

Q36: The crystalline lens of people at old age becomes milky and cloudy. This condition is called

• myopia
• lever
• cataract
• presbyopia

Q37: The farthest point of a normal eye is

• 25 cm
• 50 cm
• 75 cm
• infinity

Q38: The amount of light entering the eye can be controlled by the

• iris
• pupil
• cornea
• ciliary muscles

Q39: 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:

• is parallel to the incident ray
• is perpendicular to the incident ray
• is parallel to the refracted ray
• bends at an angle to the direction of the incident ray

Q40: Type of lens used in correction of hypermetropia

• concave lens
• reflecting lens
• bifocal lens
• convex lens

Q41: The defect of vision in which a person cannot see the distant objects clearly but can see nearby objects clearly is called

• myopia
• hypermetropia
• presbyopia
• bifocal eye

Q42: The medical condition in which the lens of the eye of a person becomes progressively cloudy resulting in blurred vision is called

• myopia
• hypermetropia
• presbyopia
• cataract

Q43: Type of lens used in correction of hypermetropia

• concave lens
• reflecting lens
• bifocal lens
• convex lens

Q44: Reason behind advance sunrise and delayed sunset

• atmospheric refraction
• total internal reflection
• dispersion
• reflection

Q45: The splitting of white light into its component colours is called

• refraction
• reflation
• dispersion
• tyndall effect

Q46: Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

• Twinkling of stars
• Stars seem higher than they actually are
• Advanced sunrise and delayed sunset
• Rainbow

Q47: The splitting of white light into its component colours is called

• refraction
• reflation
• dispersion
• tyndall effect