# Unseen Passage

For Class 4 to Class 12

# Human Eyes and Colourful World MCQ Class 10 Science

Read these Human Eye and Colourful World Class 10 MCQs pdf with answers. This Class 10 Science Chapter 11 MCQ is prepared by our expert teachers on the latest exam pattern of the CBSE Board Exam. It will help you to make your preparation better to score good marks in your exam.

Please refer to Chapter 11 Human Eyes and Colourful World MCQ Class 10 Science with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 10 Science. Students should refer to MCQ Questions for Class 10 Science with Answers to score more marks in Grade 10 Science exams. Students should read the chapter Human Eyes and Colourful World and then attempt the following objective questions.

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

The Human Eyes and Colourful World MCQ Standard 10 Science provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The focal length of eye lens is controlled by :
(A) Iris
(B) Cornea
(C) Ciliary muscles
(D) Optic nerve

C

Question. Least distance of distinct vision of a longsignted man is 40 cm. He wish to reduce it to 25 cm by using a lens the focal length of the lens is-
(A) +200/3 cm
(B) -200/3 cm
(C) +200 cm
(D) –200 cm

A

Question. Dispersion of light by a prism is due to the change in-
(A) frequency of light
(B) speed of light
(C) scattering
(D) none of these

B

Question. Convex lens of suitable focal length can correct-
(A) short sightedness
(B) long sightedness
(C) presbyopia
(D) astigmatism

B

Question. The focal length of human eye lens is (with relaxed eye)-
(A) 2.5 cm
(B) 25 cm
(C) 25 m
(D) ∞

A

Question. Which of the following colour has the least wavelength ?
(A) Red
(B) Orange
(C) Violet
(D) Blue

C

Question. A white light falls on a glass prism, the least deviated colour is-
(A) Violet
(B) Orange
(C) Red
(D) Yellow

C

Question. Blue colour of sky is due to-
(A) dispersion of light
(B) scattering of light
(C) refraction of light
(D) reflection of light

B

Question. Power of accommodation (max. variation in power of eye lens) of a normal eye is about
(A) 1D
(B) 2D
(C) 3D
(D) 4D

D

Question. Rainbow is formed due to-
(A) reflection and dispersion of light through the water droplets
(B) total internal reflection, refraction and dispersion of light through the water droplets
(C) only dispersion of light
(D) only refraction of light

B

Question. 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

A

Question. Bi-focal lens are required to correct
(A) astigmatism
(B) coma
(C) myopia
(D) presbyopia

D

Question. 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

C

Question. 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.

B

Question. 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

A

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. 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.

C

Question. 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

D

Question. 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.

B

Question. 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

C

Question. 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.

C

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

B

Question. 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

A

Question. The human eye forms the image of an object at its
(A) Cornea
(B) Iris
(C) Pupil
(D) Retina

D

Question. 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

C

(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.

Question. Assertion: Myopia is due to the increased converging power of the eye lens.
Reason: Myopia can be corrected by using spectacles made from concave lenses.

B

Question. Assertion: When we see an object, the image formed on the retina is real and inverted.
Reason: If the magnification of a system is less than one, then the image formed is inverted.

C

Question. Assertion : When ray of light falls on the particles of a colloidal solution, the path of the beam is visible.
Reason : Path of light is visible due to the scattering of light by the colloidal particles.

A

Question. Assertion : When a ray of light passes through a prism, it bends towards the thicker part of the prism.
Reason : An incident ray strikes a prism, undergoes refraction and comes out as an emergent ray.

B

Question. Assertion: Rainbow is an example of the dispersion of sunlight by the water droplets.
Reason: Light of shorter wavelength is scattered much more than light of larger wavelength.

B

Question. Assertion: The twinkling of stars is due to the fact that refractive index of the earth’s atmosphere fluctuates.
Reason: In cold countries, the phenomenon of looming (i.e., ship appears in the sky) takes place, because refractive index of air decreases with height.

B

Question. Assertion : Sun looks white at noon.
Reason : At noon, the light has to travel longer distance through the atmosphere before reaching the eye of an observer.

C

Fill in the Blanks :

Question. For a normal eye, the range of vision is from ……………..

25 cm to infinity

Question. The splitting of white light into its component colours is called ……….

dispersion.

Question. A person is short-sighted if his eyeball is too ………………..

long

Question. The ability of the eye to focus both near and distant objects, by adjusting its focal length, is called the …..

accommodation of the eye.

Question. The screen on which the image is formed by the lens system of the human eye is called ……………

retina

Question. The smallest distance, at which the eye can see objects clearly without strain, is called the …………. of the eye.

near point

Question. The coloured diaphragm between the cornea and the lens is …………….

iris

True / False :

Question. The transparent spherical membrane covering the front of the eye is known as cornea.

True

Question. The colour that deviates maximum while passing through a glass prism is violet.

True

Question. The eye which cannot see distant objects clearly is said to suffer from myopia.

True

Question. Colour blindness is a genetic disorder which occurs by inheritance.

True

Question. Clouds look white because water droplets of clouds scatter all colours of light equally.

True

Question. Hypermetropia is corrected by using a convex lens of suitable power.

True

Question. Water droplets act as tiny prism in the formation of rainbow.

True

Class 10 Human Eye and Colourful World MCQ is great for preparing for the CBSE Class 10 board examinations. CBSE Class 10 Science Syllabus is much bigger and requires concentrated efforts on the part of the student to face the examinations and pop out a success.

Human Eye and Colourful World Class 10 MCQs Pdf download consist of details for all chapters from the subjects. Each explanation is provided with all the assumptions and good judgment used to determine the conclusion. This will allow the students to study and understand each concept even though they are preparing for the first time.

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