TS 10th Class Physical Science Bits Chapter 5 Human Eye and Colourful World

These TS 10th Class Physical Science Bits with Answers Chapter 5 Human Eye and Colourful World will help students to enhance their time management skills.

TS 10th Class Physical Science Bits Chapter 5 Human Eye and Colourful World

Question 1.
The process of re-emission of absorbed light ¡n all directions with different intensities by the atom or molecule is called
(A) scattering of light
(B) dispersion of light
(C) reflection of light
(D) refraction of light
Answer:
(A) scattering of light

Question 2.
The least distance of distinct vision for a healthy adult with normal vision is about ( );
(A) 2.5 cm
(B) 25 m
(C) 25 cm
(D) 25 mm
Answer:
(A) 2.5 cm

Question 3.
The human eye forms the image of an object on its ( )
(A) iris
(B) retina
(C) pupil
(D) cornea
Answer:
(C) pupil

Question 4.
The focal length of a normal eye lens ‘s about ( )
(A) 2 cm
(B) 25 m
(C) 1 m
(D) 1 mm
Answer:
(B) 25 m

Question 5.
During refraction, the physical factor that changes is ( )
(A) frequency
(B) speed of light
(C) wavelength
(D) All of A, B & C
Answer:
(A) frequency

Question 6.
An Iron ball coated with soot and held under water appears as a ball of ………………….. . ( )
(A) copper
(B) polished silver
(C) shining gold
(D) brass
Answer:
(C) shining gold

Question 7.
A transparent medium separated from the surrounding medium by atleast two Inclined plane surfaces is called. ( )
(A) lens
(B) convex mirror
(C) parabolic mirror
(D) prism
Answer:
(A) lens

Question 8.
The angle between the incident ray and emergent ray In a prism Is called : ()
(A) critical angle
(B) angle of deviation
(C) angle of prism
(D) angle of reflection
Answer:
(D) angle of reflection

Question 9.
An eye specialist advised Prabha to use 2D lens. Its focal length is ………………….. . ( )
(A) 100 cm
(B) 200 cm
(C) 20 cm
(D) 50 cm
Answer:
(D) 50 cm

Question 10.
The part of the eye that regulates the amount of light entering the eye is ( )
(A) pupil
(B) retina
(C) iris
(D) cornea
Answer:
(A) pupil

Question 11.
The colour of the light that bends the most when white light is dispered is ( )
(A) red
(B) green
(C) yellow
(D) violet
Answer:
(D) violet

Question 12.
The twinkling of stars is the effect of ( )
(A) reflection of light
(B) movement of stars
(C) position of stars
(D) atmospheric refraction
Answer:
(D) atmospheric refraction

Question 13.
The change in focal length of the eye-lens is caused by: ( )
(A) chordiac muscle
(B) ciliary muscles
(C) pupil
(D) retina
Answer:
(B) ciliary muscles

Question 14.
The size of an object as seen by an eye depends upon ( )
(A) aperture of the pupil
(B) size of object
(C) distance of object from the eye
(D) distance of Image from eye lens
Answer:
(C) distance of object from the eye

Question 15.
When we see an object, the image formed on the retina is ( )
(A) virtual
(B) real
(C) inverted
(D) both B&C
Answer:
(D) both B&C

Question 16.
The defect of the eye caused when the Image of distant object is focussed before retina : ( )
(A) Myopia
(B) Hypermetropia
(C) Presbyopia
(D) Astigmatism
Answer:
(A) Myopia

Question 17.
People suffering from both myopia and hypermetropia are advised to use : ( )
(A) biconvex lenses
(B) biconcave lenses
(C) cylindrical lenses
(D) bifocal lenses
Answer:
(D) bifocal lenses

Question 18.
The defect of the eye that Is caused by weakening of the ciliary muscles Is called ……….. .( )
(A) Myopia
(B) Presbyopla
(C) Hyper ametropia
(D) Astigmatism
Answer:
(B) Presbyopla

Question 19.
Hyper metropole Is also known as ( )
(A) short-sightedness
(B) cataract
(C) lar sightedness
(D) presbyopia
Answer:
(C) lar sightedness

Question 20.
The ability of the eye lens to adjust its focal length is called. ( )
(A) accommodation
(B) adjustment
(C) rectification
(D) none
Answer:
(A) accommodation

Question 21.
Light enters the eye through a thin membrane called : ( )
(A) Iris
(B) Cornea
(C) Retina
(D) Aqueous humour
Answer:
(B) Cornea

Question 22.
The part of the eye that controls the size of the pupil is ( )
(A) Cornea
(B) Retina
(C) Iris
(D) Optic nerve
Answer:
(C) Iris

Question 23.
The farthest point upto which a human eye can see objects clearly is called the …………….. . ()
(A) near point
(B) fixed point
(C) far point
(D) null point
Answer:
(C) far point

Question 24.
Hypermetropia arises because ……………………. . ( )
(A) focal length of eye lens is too long
(B) eyeball has become too small
(C) retina is too small
(D) both A & B
Answer:
(D) both A & B

Question 25.
Splitting of white light into band of colours is called:  ( )
(A) devIation
(B) dispersion
(C) diffraction
(D) polarisation
Answer:
(B) dispersion

Question 26.
Prism angle and refractive index for a prism are 600 and 1.414 then angle of minimum deviation will be ……………………. . ( )
(A) 15°
(B) 30°
(C) 45°
(D) 60°
Answer:
(B) 30°

Question 27.
In the visible spectrum (VIBGYOR) the colour having the shortest wavelength Is ………………. . ( )
(A) green
(B) red
(C) violet
(D) blue
Answer:
(C) violet

Question 28.
A camera consists of a ……….. lens to form ……………………. mages. ( )
(A) diverging, real
(B) diverging, virtual
(C) converging, real
(D) converging, virtual
Answer:
(C) converging, real

Question 29.
When the eye is focussed on an object very far away, the focal length of the eyelens is …………………. . ( )
(A) maximum
(B) minimum
(C) equal to that of the crystalline lens
(D) half of Its maximum focal length
Answer:
(A) maximum

Question 30.
A lens has a power of +0.5 D. It is …………………… . ( )
(A) a convex lens of focal length 5 m
(B) a convex lens of focal length 5 cm
(C) a convex lens of focal length 2 m
(D) a concave lens of focal length 2 m
Answer:
(C) a convex lens of focal length 2 m

Question 31.
The combination responsible for admitting different amounts of light Into the eye is ………. ( )
(A) ciliary muscles and crystalline lens
(B) ciliary muscles and pupil
(C) iris and pupil
(D) rods and cones
Answer:
(C) iris and pupil

Question 32.
The number of surfaces bounding a prism are ……………………… . ( )
(A) 3
(B) 4
(C) 5
(D) 6
Answer:
(C) 5

Question 33.
A person cannot distinguish between different colours. There is a problem with his ……… . ()
(A) cornea
(B) ciliary muscles
(C) cones
(D) rods
Answer:
(D) rods

Question 34.
The power of accommodation for the normal eye is ( )
(A) 4D
(B) 40 D
(C) 44 D
(D) 400 D
Answer:
(A) 4D

Question 35.
Hypermetropia can be corrected by ………………………. . ( )
(A) concave mirror
(B) concave lens
(C) convex mirror
(D) convex lens
Answer:
(D) convex lens

Question 36.
Most of the refraction of light rays entering the eye occurs at the outer surface of …………. . ( )
(A) cornea
(B) iris
(C) retina
(D) ciliary muscles
Answer:
(A) cornea

Question 37.
The front portion of eyeball is covered by a transparent protective membrane called ………… . ()
(A) cornea
(B) pupil
(C) Iris
(D) retina
Answer:
(A) cornea

Question 38.
If f is negative, this indicates that it is a ………………………….. lens. ( )
(A) concave
(B) convex
(C) plane
(D) bi-focal
Answer:
(A) concave

Question 39.
If the power of lens is 2D, the focal length of the lens is ……………….. . ( )
(A) 100 cm
(8) 50 cm
(C) 200 cm
(D) 25 cm
Answer:
(A) 100 cm

Question 40.
The angle between the plane surfaces of a prism is called …………………. . ( )
(A) angle of prism
(B) deviation of prism
(C) minimum deviation of prism
(D) angle of incidence
Answer:
(C) minimum deviation of prism

Question 41.
The phenomenon of light scattering in gases and liquids was explained by ( )
(A) Newton
(B) Christian Huygen
(C) C.V. Raman
(D) Faraday
Answer:
(C) C.V. Raman

Question 42.
The distance between the eye lens and retina is about …………………… . ( )
(A) 20 cm
(B) 25 cm
(C) 15 cm
(D) 2.5 cm
Answer:
(D) 2.5 cm

Question 43.
The maximum focal length of the eye lens is about …………………. . ( )
(A) 20 cm
(B) 2.5 cm
(C) 15 cm
(D) 25 cm
Answer:
(B) 2.5 cm

Question 44.
The power of lens is 1D, then focal length is …………………….. . ( )
(A) 1 cm
(B) 10 cm
(C) 100 cm
(D) 50 cm
Answer:
(C) 100 cm

Question 45.
Hypermetropia can be corrected by using ……………………. lens. ( )
(A) convex
(B) concave
(C) bi-convex
(D) bi-concave
Answer:
(C) bi-convex

Question 46.
During refraction of light, the character of light which does not change is ……………….. .( )
(A) wavelength
(B) frequency
(C) speed
(D) colour
Answer:
(B) frequency

Question 47.
The ……………………… of light changes when it travels from one medium to another medium. ( )
(A) wavelength
(B) frequency
(C) speed
(D) colour
Answer:
(C) speed

Question 48.
Short-sightedness can be removed by using ……………… lenses. ( )
(A) concave
(B) convex
(C) Plano concave
(D) piano-convex
Answer:
(A) concave

Question 49.
The line joining the centres of curvature of the two surfaces of lens Is called its ( )
(A) radius of curvature
(B) focal length
(C) principal axis
(D) pole
Answer:
(C) principal axis

Question 50.
……………………………. reflection does not obey laws of reflection. ( )
(A) irregular
(B) regular
(C) plane
(D) curved
Answer:
(A) irregular

Question 51.
The middle point of the Iris has a hole which Is called …………………… . ( )
(A) pupil
(B) ciliary muscle
(C) iris
(D) diaphragm
Answer:
(A) pupil

Question 52.
The screen on which the image Is formed by the lens system of the human eye is called ……………………… . ( )
(A) pupil
(B) retina
(C) Iris
(D) lens
Answer:
(B) retina

Question 53.
……………………… responds to the intensity of light. ( )
(A) rods
(B) cones
(C) ciliary muscles
(D) retina
Answer:
(B) cones

Question 54.
…………………. respond to colour by generating electrical nerve pulses. ( )
(A) rods
(B) cones
(C) eyelid
(D) retina
Answer:
(A) rods

Question 55.
The closest distance at which the eye can focus clearly Is called the …………………… . ( )
(A) far point
(B) near point
(C) focus point
(D) clear point
Answer:
(B) near point

Question 56.
The defect of the eye due to which a person Is unable to distinguish between certain colours, known as ………………………….. . ( )
(A) colour blindness
(B) astigmatism
(C) presbyopia
(D) chromatic aberration
Answer:
(B) astigmatism

Question 57.
The band of colours produced on the screen is called ……………………. . ( )
(A) colour band
(B) range of colours
(C) spray of colours
(D) spectrum
Answer:
(D) spectrum

Question 58.
The smallest distance, at which the eye can see objects clearly without strain, is called the ……………………… of the eye. ( )
(A) far point
(B) near point
(C) focal point
(D) endpoint
Answer:
(B) near point

Question 59.
Sunlight comprises …………………….. colours. ( )
(A) 3
(B) 7
(C) 6
(D) 0
Answer:
(B) 7

Question 60.
The wavelength of red colour is ……………………… . ( )
(A) 7 x 10^-7m
(B) 7 x 10^-6m
(C) 7 x 10^-8m
(D) 7 x 10^-10m
Answer:
(A) 7 x 10^-7m

Question 61.
In n = \(\frac{\sin \left(\frac{A+D}{2}\right)}{\sin \left(\frac{A}{2}\right)} \) ‘D ‘ is the ……………………… . ( )
(A) angle of prism
(B) angle of Incidence
(C) angle of emergence
(D) angle of minimum deviation
Answer:
(D) angle of minimum deviation

Question 62.
The refractive index of a medium depends on ……………………… of light. ( )
(A) speed
(B) wavelength
(C) frequency
(D) colour
Answer:
(B) wavelength

Question 63.
The relation between angle of incidence (i₁) angle of emergence (i₂) angle of deviation (d) and angle of prism (A) is ……………………… . ( )
(A) A+i₁=d+i₂
(B) A-i₂=i₂-d
(C) A+d=i₁-i₂
(D) A-i₂ = d + i₁
Answer:
(B) A-i₂=i₂-d

Question 64.
Power of lens P = ……………………….. ( )
(A) \(\frac{1}{f} \)
(B) \(\frac{1}{D} \)
(C) \(\frac{f}{100} \)
(D) \(\frac{D}{100}\)
Answer:
(A) \(\frac{1}{f} \)

Question 65.
To see the whole object, the angle of vision at the eye should be about ……………… ()
(A) 45°
(B) 60°
(C) 42°
(D) 36°
Answer:
(B) 60°

Question 66.
……………………….. are the receptors which identify colour. ( )
(A) cones
(B) ciliary muscles
(C) rods
(D) optic nerves
Answer:
(C) rods

Question 67.
The point of maximum distance at which the eye lens can form an Image on the retina is called ………………………. ( )
(A) near point
(B) far point
(C) focal point
(D) optic centre
Answer:
(B) far point

Question 68.
A person suffering from hyper metropla cannot see the objects at ……………………… .()
(A) near distance
(B) longer distance
(C) any distance
(D) close to eye
Answer:
(A) near distance

Question 69.
The ability of accommodation of the eye usually decreases with ageing. This defect is called ( )
(A) myopia
(B) hyper metropole
(C) colour blindness
(D) presbyopia
Answer:
(D) presbyopia

Question 70.
……………………….. has shortest wavelength in VIBGYOR.
(A) red
(B) green
(C) blue
(D) violet
Answer:
(D) violet

Question 71.
Blue colour of the sky is a result of ……………………. .
(A) scattering
(B) dispersion
(C) reflection
(D) refraction
Answer:
(B) dispersion

Question 72.
‘presbyopia’ can be corrected by using a ………………………… .
(A) convex lens
(B) concave lens
(C) bi-focal lens
(D) plane lens
Answer:
(C) bi-focal lens

Question 73.
Light is an …………………………. wave.
(A) electromagnetic
(B) longitudinal
(C) progressive
(D) stationary
Answer:
(A) electromagnetic

Question 74.
The colours of light which bends most and least are
(A) Red and Blue
(B) Blue and Red
(C) Violet and Red
(D) Red and Violet
Answer:
(C) Violet and Red

Question 75.
Dispersion of light through a prism is
(A) same as reflection
(B) same as refraction
(C) splitting of white light into its constituent colours
(D) none of the above
Answer:
(C) splitting of white light into its constituent colours

Question 76.
At noon the sun appears white as ( )
(A) light is least scattered
(B) all the colours of the white light are scattered away
(C) blue colour is scattered the most
(D) red colour Is scattered the most
Answer:
(A) light is least scattered

Question 77.
The danger signals installed at the top of the 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
(C) is absorbed the most by smoke or fog
(D) moves fastest in air
Answer:
(B) Is scattered the least by smoke or fog

Question 78.
Which of the following defects can be corrected by cylindrical lens? ( )
(A) Myopia
(B) Hypermetropia
(C) Presbyopla
(D) Astigmatism
Answer:
(D) Astigmatism

Question 79.
The colours that deviate maximum/minimum in visible spectrum are ( )
(A) red/violet
(B) green/yellow
(C) violet/red
(D) yellow/green
Answer:
(C) violet/red

Question 80.
The deviation of which colour light is taken as mean deviation? ( )
(A) red
(B) yellow
(C) orange
(D) blue
Answer:
(B) yellow

Question 81.
A white colour object ( )
(A) absorbs all colours
(B) reflects all the colours
(C) transmits all colours
(D) scatters all colours
Answer:
(B) reflects all the colours

Question 82.
Blue colour of the sky is due to ………….. molecules present in the atmosphere.( )
(A) Water vapour and Krypton
(B) Carbon dioxide and Carbon monoxide
(C) Nitrogen and Oxygen
(D) Krypton and Carbon monoxide
Answer:
(C) Nitrogen and Oxygen

Question 83.
The reason behind the blue colour of the sky is ……………………. .( )
(A) Reflection of light
(B) Refraction of light
(C) Dispersion of light
(D) Scattering of light
Answer:
(D) Scattering of light