# MCQs for Science Class 10 with Answers Chapter 11 Human Eyes and Colourful World

Students of class 10 Science should refer to MCQ Questions Class 10 Science Human Eyes and Colourful World with answers provided here which is an important chapter in Class 10 Science NCERT textbook. These MCQ for Class 10 Science with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 10 Science. The following MCQs can help you to practice and get better marks in the upcoming class 10 Science examination

## Chapter 11 Human Eyes and Colourful World MCQ with Answers Class 10 Science

MCQ Questions Class 10 Science Human Eyes and Colourful World provided below have been prepared by expert teachers of grade 10. These objective questions with solutions are expected to come in the upcoming Standard 10 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question: A given ray of light suffers minimum deviation in an equilateral prism P. Additional prisms Q and R of identical shape and material are now added to P as shown in the figure. The ray will suffer

(a) greater deviatio
(b) same deviation
(c) no deviation
(d) total internal reflection

A

Question: A long-sighted person cannot see objects clearly at a distance less than 40 cm. from his eye. The power of the lens needed to read an object at 25 cm. is
(a) – 2.5 D
(b) + 2.5 D
(c) – 6.25 D
(d) + 1.5 D

D

Question: Twinkling of stars is on account of
(a) Large distance of stars and storms in air
(b) Small size of stars
(c) Large size of stars
(d) Large distance of stars and fluctuations in the density of air.

D

Question: White light is incident at an angle to the surface of a triangular piece of glass. Which color of light deviates most from its original path after leaving the glass?
(a) red
(b) orange
(c) green
(d) blue

D

Question: A long sighted person has a minimum distance of distinct vision of 50 cm. He wants to reduce it to 25 cm. He should use a
(a) Concave lens of focal length 50 cm
(b) Convex lens of focal length 25 cm
(c) Convex lens of focal length 50 cm
(d) Concave lens of focal length 25 cm

C

Question: The middle vascular coat that darkens the eye chamber and prevents refraction by absorbing the light rays is
(a) choroid
(b) sclera
(c) retina
(d) cornea

A

Question: When the light is bright,
(a) the iris makes the pupil expand
(b) the iris and the pupil contract
(c) the iris and the pupil remain as they are
(d) none of the above

B

Question:The eyelens ………. light rays to form real, inverted and highly diminished image on the …….
(a) converges, retina
(b) diverges, retina
(c) converges, pupil
(d) diverges, pupil

B

Question: When light rays enter the eye, most of the refraction occurs at the
(a) crystalline lens
(b) outer surface of the cornea
(c) iris
(d) pupil

B

Question: The ‘far point’ of a normal human eye is
(a) 25 cm
(b) 25 m
(c) 100 m
(d) at infinity

D

Question: The property related to the sense of continuity of vision is called
(a) persistence of vision
(b) colour blindness
(c) optical illusion
(d) none of these

A

Question: When the ciliary muscles are relaxed, the eyelens is …………. and distant objects can be seen clearly.
(a) thin
(b) thick
(c) inclined
(d) none of these

A

Question: The surface of retina has about 125 million light sensitive
(a) rods only
(b) cones only
(c) rods and cones
(d) neither rods nor cones

C

Question: The change in focal length of an eyelens to focus the image of object at varying distances is done by the action of the
(a) pupil
(b) ciliary muscles
(c) retina
(d) blind spot

B

Question: 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

C

Question: 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

A

Question: While looking at nearby objects, the ciliary muscles ……….. the eyelens so as to ………. its focal length.
(a) contract, increase
(b) contract, decrease
(c) expand, increase
(d) expand, decrease

B

Question: A beam of light consisting of red, green and blue colours is incident on a right-angled prism as shown. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively. The prism will

(a) separate part of the red colour from the green and blue colours.
(b) separate part of the blue colour from the red and green colours.
(c) separate all the three colours from one another.
(d) not separate even partially any colour from the other two colours.

A

Question: Which of the following statements is correct regarding the propagation of light of different colours of white light in air?
(a) Red light moves fastest
(b) Blue light moves faster than green light
(c) All the colours of the white light move with the same speed
(d) Yellow light moves with the mean speed as that of
the red and the violet light

C

Question: When a ray passes through a prism,
(a) it goes undeviated
(b) it remains parallel to the base
(c) it bends towards the base
(d) none of the above

C

Question: The rod cells correspond to
(a) the colour of light
(b) the source of light
(c) the intensity of light
(d) none of these

C

Question: 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 violet and blue colour lights by the atmosphere

C

Question: 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

A

Question: The bluish colour of water in deep sea is due to
(a) the presence of algae and other plants found in water
(b) reflection of sky in water
(c) scattering of light
(d) absorption of light by the sea

C

Question: A student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his text book. Which of the following statements is correct?
(a) The near point of his eyes has receded away
(b) The near point of his eyes has come closer to him
(c) The far point of his eyes has come closer to him
(d) The far point of his eyes has receded away

A

Question: 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
(c) is absorbed the most by smoke or fog
(d) moves fastest in air

C

Question: Which of the following phenomena 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 of light
(d) Reflection of light from the earth

B

Question: The stars twinkle in the night, becauses :
(a) Their emit light intermittently
(b) Their star’s atmosphere absorbs light intermittently
(c) The earth’s atmosphere absorbs light intermittently
(d) The refractive index of air in atmosphere fluctuates

D

Question: A person is suffering from both near sightedness and far sightedness. His spectacles would be made of
(a) two convex lenses with the upper lens having a larger focal length than the lower lens.
(b) two concave lenses with the upper lens having a smaller focal length than the lower lens.
(c) a concave lens as the upper lens and a convex lens as the lower lens
(d) a convex lens as the upper lens and a concave lens as the lower lens

C

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

B

Question. 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

D

Question. 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

C

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

C

Question. 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

D

Question. 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.

B

Question. 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

B

Question. 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

D

Question. 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.

A

Question. 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

D

Question. 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

B

Question. 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

B

Question. 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

D

Question. 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.

A

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

B

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

C

Question. 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.

C

Question. 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

D

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

D

Question. 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

C

Question. 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

B

Question. 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.

A

Question. 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

B

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

A

Question. 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

C

Fill in the Blanks :

Question. The defect of the eye due to which a person is unable to distinguish between certain colours, known as ………

colour blindness

Question. For young adult with normal vision, least distance of distinct vision = ………….

25 cm.

Question. ……………… causes the blue colour of sky and the reddening of the Sun at sunrise and sunset.

Scattering of light

Question. The closest distance at which the eye can focus clearly is called the ……………..

near point

Question. Sunlight comprises …………… colours.

7

Question. The eye which cannot simultaneously see with the same distinctness all objects or lines making different inclinations is said to suffer from ………

astigmatism.

Question. The middle point of the iris has a hole, which is called ………….

pupil

True / False :

Question. The sun looks red at sunset because most of the blue light in sunrays is scattered leaving behind red and yellow lights.

True

Question. In Myopia the image of distant objects is focused before the retina.

True

Question. The eye which can see near object clearly is said to suffer from hypermetropia.

False

Question. The sun is visible two minutes before the actual sunrise due to atmospheric refraction.

True

Question. A person suffering from myopia cannot see distant objects clearly.

True

Question. Lens which is used for correcting the presbyopia defect of the eye is concave.