"Light" chapter:13 of Class 8 CBSE Science
Extra 40 multiple-choice questions (MCQs) , along with their answers:-
Which of the following surfaces reflects light regularly?
(a) Rough surface
(b) Irregular surface
(c) Smooth surface
(d) All of the above
Answer: (c) Smooth surface
The phenomenon of splitting of white light into its component colors is called:
(a) Reflection
(b) Refraction
(c) Dispersion
(d) Interference
Answer: (c) Dispersion
The angle of incidence is equal to the angle of:
(a) Refraction
(b) Deviation
(c) Reflection
(d) Dispersion
Answer: (c) Reflection
A mirror that forms a diminished and virtual image is:
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Any mirror
Answer: (c) Convex mirror
The coloured part of the eye is called:
(a) Retina
(b) Cornea
(c) Iris
(d) Pupil
Answer: (c) Iris
The part of the eye that acts as a screen is:
(a) Cornea
(b) Iris
(c) Pupil
(d) Retina
Answer: (d) Retina
The size of the pupil is controlled by:
(a) Retina
(b) Cornea
(c) Iris
(d) Lens
Answer: (c) Iris
The lens in the human eye is:
(a) Concave
(b) Convex
(c) Plane
(d) Cylindrical
Answer: (b) Convex
The phenomenon of bending of light as it passes from one medium to another is called:
(a) Reflection
(b) Refraction
(c) Dispersion
(d) Interference
Answer: (b) Refraction
The image formed by a plane mirror is:
(a) Real and inverted
(b) Virtual and erect
(c) Real and erect
(d) Virtual and inverted
Answer: (b) Virtual and erect
Which of the following is a natural source of light?
(a) Bulb
(b) Candle
(c) Sun
(d) Torch
Answer: (c) Sun
The sensation of vision is carried to the brain by:
(a) Cornea
(b) Lens
(c) Optic nerve
(d) Retina
Answer: (c) Optic nerve
What is the number of colours present in white light?
(a) 5
(b) 6
(c) 7
(d) 8
Answer: (c) 7
Which mirror is used as a rear-view mirror in vehicles?
(a) Plane mirror
(b) Concave mirror
(c) Convex mirror
(d) Any mirror
Answer: (c) Convex mirror
The smallest hole in the iris is called:
(a) Cornea
(b) Retina
(c) Pupil
(d) Lens
Answer: (c) Pupil
The phenomenon of light bouncing back from a surface is called:
(a) Refraction
(b) Reflection
(c) Dispersion
(d) Diffraction
Answer: (b) Reflection
Which of the following is a luminous object?
(a) Moon
(b) Book
(c) Sun
(d) Table
Answer: (c) Sun
The image formed by a concave mirror when the object is placed between the pole and focus is:
(a) Real and inverted
(b) Virtual and erect
(c) Real and erect
(d) Virtual and inverted
Answer: (b) Virtual and erect
The transparent front part of the eye is called:
(a) Iris
(b) Pupil
(c) Cornea
(d) Retina
Answer: (c) Cornea
Which colour of light deviates the most when white light passes through a prism?
(a) Red
(b) Green
(c) Violet
(d) Yellow
Answer: (c) Violet
Which part of the eye is responsible for colour vision?
(a) Rods
(b) Cones
(c) Lens
(d) Cornea
Answer: (b) Cones
What is the angle of reflection if the angle of incidence is 45 degrees?
(a) 90 degrees
(b) 0 degrees
(c) 45 degrees
(d) 22.5 degrees
Answer: (c) 45 degrees
Which mirror forms a magnified and real image?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Any mirror
Answer: (c) Concave mirror
What is the function of the lens in the human eye?
(a) To control the size of the pupil
(b) To focus light on the retina
(c) To protect the eye
(d) To provide colour vision
Answer: (b) To focus light on the retina
The splitting of sunlight into a rainbow is an example of:
(a) Reflection
(b) Refraction
(c) Dispersion
(d) Interference
Answer: (c) Dispersion
Which part of the eye is sensitive to dim light?
(a) Cones
(b) Rods
(c) Lens
(d) Cornea
Answer: (b) Rods
What is the path of light called?
(a) Ray
(b) Beam
(c) Wave
(d) Spectrum
Answer: (a) Ray
Which mirror is used by dentists to see enlarged images of teeth?
(a) Convex mirror
(b) Plane mirror
(c) Concave mirror
(d) Any mirror
Answer: (c) Concave mirror
What is the function of the cornea?
(a) To focus light
(b) To control pupil size
(c) To protect the eye and refract light
(d) To detect colours
Answer: (c) To protect the eye and refract light
What is the sequence of colours in a rainbow?
(a) ROYGBIV
(b) VIBGYOR
(c) RGBYIV
(d) YROGBIV
Answer: (b) VIBGYOR
What is the name for the point where incident rays meet a mirror?
(a) Reflection point
(b) Incidence point
(c) Focal point
(d) Vertex
Answer: (b) Incidence point
What is the function of the optic nerve?
(a) To focus light
(b) To transmit visual information to the brain
(c) To control pupil size
(d) To provide colour vision
Answer: (b) To transmit visual information to the brain
Which of the following is an example of regular reflection?
(a) Reflection from a mirror
(b) Reflection from a paper
(c) Reflection from a wall
(d) Reflection from a tree
Answer: (a) Reflection from a mirror
What type of image is formed by a convex mirror?
(a) Real and inverted
(b) Virtual and erect
(c) Real and erect
(d) Virtual and inverted
Answer: (b) Virtual and erect
What is the primary function of the iris?
(a) To focus light
(b) To control the amount of light entering the eye
(c) To detect colors
(d) To protect the eye
Answer: (b) To control the amount of light entering the eye
What is the name for the band of colors formed when white light is dispersed?
(a) Rainbow
(b) Spectrum
(c) Ray
(d) Beam
Answer: (b) Spectrum
What is the function of the rods in the retina?
(a) To detect colors
(b) To see in dim light
(c) To focus light
(d) To control pupil size
Answer: (b) To see in dim light
What type of image is formed by a plane mirror?
(a) Real and magnified
(b) Virtual and magnified
(c) Real and same size
(d) Virtual and same size
Answer: (d) Virtual and same size
What does the term "luminous" mean?
(a) Reflecting light
(b) Producing its own light
(c) Transmitting light
(d) Absorbing light
Answer: (b) Producing its own light
What is the name of the transparent layer in the front of the eye?
(a) retina
(b) iris
(c) cornea
(d) pupil
Answer: (c) cornea
