Extra 40 multiple-choice questions (MCQs) with answers on the chapter:10 "Human Eye and Colourful World" for Class 10 CBSE Science:
What is the least distance of distinct vision for a normal human eye?
a) 10 cm
b) 25 cm
c) 50 cm
d) 100 cm
Ans:
b) 25 cm
Which part of the human eye controls the amount of light entering the eye?
a) Cornea
b) Retina
c) Iris
d) Optic nerve
Ans:
c) Iris
The light-sensitive part of the eye where an image is formed is called the:
a) Cornea
b) Lens
c) Retina
d) Iris
Ans:
c) Retina
The ability of the eye to focus on both near and distant objects is called:
a) Persistence of vision
b) Accommodation
c) Refraction
d) Diffraction
Ans:
b) Accommodation
Which part of the human eye helps in focusing light rays?
a) Retina
b) Cornea
c) Iris
d) Pupil
Ans:
b) Cornea
The image formed on the retina of the human eye is:
a) Virtual and erect
b) Virtual and inverted
c) Real and inverted
d) Real and erect
Ans:
c) Real and inverted
What is the function of the optic nerve?
a) To control the shape of the eye lens
b) To carry visual information to the brain
c) To control the size of the pupil
d) To secrete tears
Ans:
b) To carry visual information to the brain
What is the power of accommodation of a normal eye?
a) 2 dioptre
b) 4 dioptre
c) Infinite
d) 100 dioptre
Ans:
c) Infinite
Which of the following is responsible for the near point and far point of the eye?
a) Cornea
b) Ciliary muscles
c) Retina
d) Pupil
Ans:
b) Ciliary muscles
What happens to the ciliary muscles when we focus on a nearby object?
a) They contract
b) They relax
c) They stop working
d) They become rigid
Ans:
a) They contract
The defect of vision where a person cannot see distant objects clearly is called:
a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism
Ans:
a) Myopia
Which lens is used to correct myopia?
a) Convex lens
b) Concave lens
c) Cylindrical lens
d) Bifocal lens
Ans:
b) Concave lens
The defect of vision where a person cannot see nearby objects clearly is called:
a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism
Ans:
b) Hypermetropia
Which lens is used to correct hypermetropia?
a) Convex lens
b) Concave lens
c) Cylindrical lens
d) Bifocal lens
Ans:
a) Convex lens
Presbyopia occurs mainly due to:
a) Excessive use of mobile phones
b) Ageing
c) Lack of vitamin A
d) Weak optic nerve
Ans:
b) Ageing
What is the far point of a normal human eye?
a) 10 m
b) 100 m
c) Infinity
d) 25 cm
Ans:
c) Infinity
Which of the following defects is corrected using a cylindrical lens?
a) Myopia
b) Hypermetropia
c) Astigmatism
d) Presbyopia
Ans:
c) Astigmatism
Which defect of vision requires bifocal lenses for correction?
a) Myopia
b) Hypermetropia
c) Presbyopia
d) Astigmatism
Ans:
c) Presbyopia
The persistence of vision for the human eye is about:
a) 1/10 second
b) 1/16 second
c) 1/6 second
d) 1 second
Ans:
b) 1/16 second
A person suffering from both myopia and hypermetropia should use:
a) Convex lens
b) Concave lens
c) Bifocal lens
d) Cylindrical lens
Ans:
c) Bifocal lens
The splitting of white light into different colours is called:
a) Reflection
b) Refraction
c) Dispersion
d) Diffraction
Ans:
c) Dispersion
Which phenomenon causes the formation of a rainbow?
a) Refraction
b) Reflection
c) Dispersion
d) All of the above
Ans:
d) All of the above
The band of seven colours obtained from white light is called:
a) Spectrum
b) Mirage
c) Tyndall effect
d) Reflection
Ans:
a) Spectrum
The colour of the sky appears blue due to:
a) Dispersion
b) Scattering
c) Reflection
d) Refraction
Ans:
b) Scattering
Which colour is scattered the least in the atmosphere?
a) Red
b) Blue
c) Violet
d) Green
Ans:
a) Red
What is the reason for the reddish appearance of the sun at sunrise and sunset?
a) Dispersion
b) Scattering of shorter wavelengths
c) Reflection
d) Absorption
Ans:
b) Scattering of shorter wavelengths
The phenomenon of light bending due to change in speed while passing through a medium is called:
a) Reflection
b) Refraction
c) Dispersion
d) Scattering
Ans:
b) Refraction
Twinkling of stars is due to:
a) Reflection of light
b) Dispersion of light
c) Atmospheric refraction
d) Scattering of light
Ans:
c) Atmospheric refraction
The blue colour of the clear sky is due to the scattering of light by:
a) Water molecules
b) Dust particles
c) Air molecules
d) Ice crystals
Ans:
c) Air molecules
The red colour of danger signals is used because:
a) It is most scattered
b) It is least scattered
c) It is most absorbed
d) It is a primary colour
Ans:
b) It is least scattered
Which scientist discovered the spectrum of white light?
a) Isaac Newton
b) Albert Einstein
c) Galileo Galilei
d) Thomas Young
Ans:
a) Isaac Newton
The rainbow is formed due to:
a) Only dispersion
b) Only refraction
c) Only reflection
d) Refraction, dispersion, and reflection
Ans:
d) Refraction, dispersion, and reflection
Which device is used to obtain the spectrum of light?
a) Microscope
b) Prism
c) Telescope
d) Convex lens
Ans:
b) Prism
The phenomenon of light bending around obstacles is called:
a) Refraction
b) Diffraction
c) Dispersion
d) Reflection
Ans:
b) Diffraction
Which of the following phenomena is responsible for the twinkling of stars?
a) Reflection
b) Refraction
c) Atmospheric refraction
d) Dispersion
Ans:
c) Atmospheric refraction
The phenomenon responsible for the apparent early sunrise and delayed sunset is:
a) Dispersion
b) Refraction
c) Scattering
d) Atmospheric refraction
Ans:
d) Atmospheric refraction
A prism splits white light into its constituent colours because:
a) Different colours have different speeds in glass
b) Light reflects inside the prism
c) The prism absorbs some colours
d) White light has only three colours
Ans:
a) Different colours have different speeds in glass
Which colour of light has the highest refractive index in a prism?
a) Red
b) Blue
c) Green
d) Violet
Ans:
d) Violet
What causes the phenomenon of the blue colour of the sky?
a) Large dust particles in the atmosphere
b) Absorption of blue light by the atmosphere
c) Scattering of blue light by air molecules
d) Reflection of the sky’s surface
Ans:
c) Scattering of blue light by air molecules
