We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 16 Light with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 8 Science with Answers on a daily basis and score well in exams. Refer to the Light Class 8 MCQs Questions with Answers here along with a detailed explanation.
Light Class 8 MCQs Questions with Answers
Choose the correct option.
Question 1.
We are able to see an object due to the presence of
(a) light
(b) dark
(c) refraction
(d) object
Answer
Answer: (a) light
Question 2.
The bouncing back of light into the same medium is called
(a) refraction
(b) reflection
(c) dispersion
(d) diffraction
Answer
Answer: (b) reflection
Question 3.
A mirror has _____ surface.
(a) rough
(b) polished
(c) dark
(d) all of these
Answer
Answer: (a) rough
Question 4.
Maximum part of light is reflected by
(a) opaque object
(b) translucent object
(c) transparent object
(d) all of these
Answer
Answer: (a) opaque object
Question 5.
Beam of light striking the reflecting surface is called
(a) incident ray
(b) reflected ray
(c) refracted ray
(d) normal ray
Answer
Answer: (b) reflected ray
Question 6.
The back side of a plane mirror contains
(a) gold coating
(b) silver coating
(c) aluminium coating
(d) copper coating
Answer
Answer: (b) silver coating
Question 7.
The perpendicular drawn to the reflecting surface is called
(a) normal
(b) incident ray
(c) reflected ray
(d) none of these
Answer
Answer: (a) normal
Question 8.
There are ________ laws of reflection.
(a) one
(b) two
(c) three
(d) four
Answer
Answer: (b) two
Question 9.
The angle of incidence is always _______ to the angle of reflection.
(a) greater
(b) smaller
(c) equal
(d) none of these
Answer
Answer: (c) equal
Question 10.
The angle between the reflected ray and the normal is called
(a) angle of incidence
(b) reflected ray
(c) angle of reflection
(d) point of incidence
Answer
Answer: (c) angle of reflection
Question 11.
The reflection of light from a smooth surface is called
(a) diffused reflection
(b) regular reflection
(c) dispersion
(d) spectrum
Answer
Answer: (b) regular reflection
Question 12.
Which of the following results in diffused reflection?
(a) Plane mirror
(b) Shiny surface
(c) Silver
(d) Wood
Answer
Answer: (d) Wood
Question 13.
The nature of image formed by plane mirror is
(a) real and inverted
(b) virtual and erect
(c) real and erect
(d) virtual and inverted
Answer
Answer: (b) virtual and erect
Question 14.
If you hold a pen in your right hand and stand in front of the mirror, the pen will be in the left hand in the image. This phenomenon is called
(a) lateral inversion
(b) diffraction
(c) reflection
(d) inversion
Answer
Answer: (a) lateral inversion
Question 15.
If two plane mirrors are inclined at an angle of 40°, number of images formed will be
(a) 7
(b) 8
(c) 9
(d) 5
Answer
Answer: (b) 8
Question 16.
Type of mirror used as side view mirror is
(a) convex mirror
(b) plane mirror
(c) concave mirror
(d) ground mirror
Answer
Answer: (a) convex mirror
Question 17.
Band of seven colours is called
(a) VIBGYOR
(b) dispersion
(c) spectrum
(d) reflection
Answer
Answer: (c) spectrum
Question 18.
Front bulged part of the eyeball is called
(a) cornea
(b) iris
(c) retina
(d) pupil
Answer
Answer: (a) cornea
Question 19.
Two mirrors A and B are placed at right angles to each other. A ray of light incident on mirror A at an angle of 25° falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be
(a) 25°
(b) 50°
(c) 65°
(d) 115°
Answer
Answer: (c) 65°
Question 20.
Visually impaired people can read and write using
(a) electronic writer
(b) Braille system
(c) digital pens
(d) hearing aids
Answer
Answer: (b) Braille system
Question 21.
A toy is placed at 10 cm in front of a plane mirror. What is the distance of image from the mirror?
(a) 20 cm
(b) 40 cm
(c) 10 cm
(d) 30 cm
Answer
Answer: (c) 10 cm
Question 22.
A candle is 30 cm high. What is the height of its image in a plane mirror?
(a) 10 cm
(b) 15 cm
(c) 30 cm
(d) 45 cm
Answer
Answer: (c) 30 cm
Question 23.
Which of the following works on the concept of multiple reflections?
(a) Telescope
(b) Binoculars
(c) Kaleidoscope
(d) Sunglasses
Answer
Answer: (c) Kaleidoscope
Question 24.
Visually challenged people can read and write with
(a) hearing aid
(b) electronic type writer
(c) Braille system
(d) digital pen
Answer
Answer: (c) Braille system
Question 25.
The human eye can clearly see up to which distance?
(a) Infinity
(b) 1000 km
(c) 100 km
(d) 10 km
Answer
Answer: (a) Infinity
Question 26.
The human eye cannot see clearly at a distance which is less than
(a) 2.5 cm
(b) 25 cm
(c) 15 cm
(d) 1.5 cm
Answer
Answer: (b) 25 cm
Question 27.
The angle between the incident ray and the normal is called angle of
(a) reflection
(b) refraction
(c) transmission
(d) incidence
Answer
Answer: (d) incidence
Question 28.
Which of the following parts of an eye controls the amount of light entering the eye by contracting or dilating?
(a) Retina
(b) Cornea
(c) Pupil
(d) Iris
Answer
Answer: (d) Iris
Question 29.
The phenomenon of breaking up of white light into its seven constituent colours is called
(a) reflection of light
(b) refraction of light
(c) dispersion of light
(d) radiation of light
Answer
Answer: (c) dispersion of light
Question 30.
We can see ourselves in a mirror or a polished surface but not on walls because of
(a) regular reflection
(b) normal reflection
(c) irregular reflection
(d) specular reflection
Answer
Answer: (c) irregular reflection
Question 31.
How many cells are there in a Braille character?
(a) 12
(b) 9
(c) 3
(d) 6
Answer
Answer: (d) 6
Question 32.
Which of the following will produce a regular reflection?
(a) Tree leaf
(b) Wood
(c) Wall
(d) Mirror
Answer
Answer: (d) Mirror
Question 33.
An instrument which enables us to see things which are too small to be seen with naked eye is called
(a) microscope
(b) periscope
(c) kaleidoscope
(d) none of these
Answer
Answer: (a) microscope
Question 34.
The property of a plane mirror to make ‘right appear as left’ and vice versa, is called
(a) vertical inversion
(b) lateral inversion
(c) reflection
(d) refraction
Answer
Answer: (b) lateral inversion
Fill in the blanks with suitable word/s.
Question 1.
Light is a form of __________
Answer
Answer: energy
Question 2.
The ray of light which strikes the reflecting surface is called __________ ray.
Answer
Answer: incident
Question 3.
The bouncing back of light after it falls on a surface is called __________
Answer
Answer: reflection
Question 4.
A mirror has _________ and _________ surface.
Answer
Answer: smooth, polished
Question 5.
__________ is the perpendicular line on the incidence point.
Answer
Answer: Normal
Question 6.
A plane mirror forms a _________ image.
Answer
Answer: virtual
Question 7.
The ray which returns after striking the surface is called __________ ray.
Answer
Answer: reflected
Question 8.
Angle of incidence is always __________ to the angle of reflection.
Answer
Answer: equal
Question 9.
Reflection from a smooth surface is called __________ reflection.
Answer
Answer: regular
Question 10.
The size of image formed by the plane mirror is __________ as size of object.
Answer
Answer: same
Question 11.
Splitting of light into seven colours is called __________
Answer
Answer: dispersion
Question 12.
Kaleidoscope is based on the concepts of __________
Answer
Answer: multiple reflection
Question 13.
The point on the surface at which incident ray strikes is called __________
Answer
Answer: point of incidence
Question 14.
The reflection of light from an uneven surface is called __________
Answer
Answer: diffused reflection
Question 15.
Paper is a _________ surface.
Answer
Answer: rough
Question 16.
Mirror is a __________ surface.
Answer
Answer: smooth
Question 17.
When the mirrors are inclined at 900, we get images.
Answer
Answer: three
Question 18.
In bright light, the size of pupil __________
Answer
Answer: decreases
Question 19.
The space between the cornea and lens is filled with a liquid called __________
Answer
Answer: aqueous humour
Question 20.
Braille system was invented by __________
Answer
Answer: Louis Braille
Question 21.
The image formed by a plane mirror is ………………….. inverted.
Answer
Answer: laterally
Question 22.
The angle of incidence is always equal to the angle of …………………..
Answer
Answer: reflection
Question 23.
………………….. formation is the natural phenomenon showing dispersion.
Answer
Answer: Rainbow
Question 24.
The lens of the eye focuses light on …………………..
Answer
Answer: retina
Question 25.
The size of the pupil becomes ………………….. when we see in dim light.
Answer
Answer: large
True or False
Question 1.
Deficiency of vitamin B causes night blindness.
Answer
Answer: False
Question 2.
In the Braille system, patterns are made with coloured dots.
Answer
Answer: False
Question 3.
Normal make 60° angle with the reflecting surface.
Answer
Answer: False
Question 4.
Angle of incidence is always equal to angle of reflection.
Answer
Answer: True
Question 5.
Diffused reflection occurs due to rough surface.
Answer
Answer: True
Question 6.
Kaleidoscope is based on the principle of dispersion of light.
Answer
Answer: False
Question 7.
Both incident ray and reflected ray lie in the same plane.
Answer
Answer: True
Question 8.
The choroid prevents the internal reflection of light and protects the light sensitive inner parts of the eye.
Answer
Answer: True
Question 9.
Rainbow forms due to dispersion.
Answer
Answer: True
Question 10.
Rods are sensitive to bright light.
Answer
Answer: False
Question 11.
The iris is the coloured part of the eye.
Answer
Answer: True
Question 12.
Diffused reflection is due to the failure of laws of reflection.
Answer
Answer: False
Question 13.
Ciliary muscles changes the shape of the lens in the eye.
Answer
Answer: True
Question 14.
We should not wash our eyes.
Answer
Answer: False
Question 15.
Braille was designed by Louis Braille.
Answer
Answer: True
Question 16.
Cones are sensitive to dark light.
Answer
Answer: False
Question 17.
Too much light is good for eyes.
Answer
Answer: False
Question 18.
The size of the pupil becomes large when we see in dim light.
Answer
Answer: True
Question 19.
The angle of incidence is not equal to the angle of reflection in irregular reflection.
Answer
Answer: False
Question 20.
The angle between the normal and the incident rays is called the angle of incidence.
Answer
Answer: True
Match the following
| Column I | Column II |
| 1. Reflection | (a) Regular reflection |
| 2. Normal vision | (b) bouncing back of light |
| 3. Smooth surface | (c) 25 cm |
| 4. Kaleidoscope | (d) Short-sightedness |
| 5. Hypermetropia | (e) Dispersion of light |
| 6. Cornea | (f) For visually challenged person |
| 7. Rainbow | (g) Multiple images |
| 8. Blind spot | (h) Front part of the eye |
| 9. Braille system | (i) Sensitive for bright light |
| 10. Rods | (j) Long-sightedness |
| 11. Cones | (k) Sensitive for dim light |
| 12. Myopia | (l) No sensory nerves |
| 13. Retina | (m) Cataract |
| 14. Cloudy lens | (n) Ability to focus |
| 15. Accommodation power | (o) Image formed |
Answer
Answer:
| Column I | Column II |
| 1. Reflection | (b) bouncing back of light |
| 2. Normal vision | (c) 25 cm |
| 3. Smooth surface | (a) Regular reflection |
| 4. Kaleidoscope | (g) Multiple images |
| 5. Hypermetropia | (j) Long-sightedness |
| 6. Cornea | (h) Front part of the eye |
| 7. Rainbow | (e) Dispersion of light |
| 8. Blind spot | (l) No sensory nerves |
| 9. Braille system | (f) For visually challenged person |
| 10. Rods | (k) Sensitive for dim light |
| 11. Cones | (i) Sensitive for bright light |
| 12. Myopia | (d) Short-sightedness |
| 13. Retina | (o) Image formed |
| 14. Cloudy lens | (m) Cataract |
| 15. Accommodation power | (n) Ability to focus |
| Column A | Column B |
| 1. Pupil | (a) Visually challenged |
| 2. Rainbow | (b) 25 cm to infinity |
| 3. Cones | (c) Controlled by iris |
| 4. Normal vision | (d) Dispersion of light |
| 5. Rubbing | (e) Sensitive to bright light |
Answer
Answer:
| Column A | Column B |
| 1. Pupil | (c) Controlled by iris |
| 2. Rainbow | (d) Dispersion of light |
| 3. Cones | (e) Sensitive to bright light |
| 4. Normal vision | (b) 25 cm to infinity |
| 5. Braille system | (a) Visually challenged |
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