Class 8 Science MCQ Light

Question : When we stand in front of our dressing table, our left hand seems to be right and right seems to be left. This is called
(a)Left-right confusion
(b)Lateral inversion
(c)Up -side down phenomenon
(d)mirage

Question : Light passing through a prism splits into seven colours. This is called
(a)Dispersion
(b)Dissolution
(c)Division
(d)None of the above

Question : Splitting of white rays of light into seven colours is called
(a) Dispersion of light
(b) Reflection of light
(c) Refraction of light
(d) Scattering of light

Question : The defect due to which a person is not able to see the distant objects clearly:
(a) Myopia
(b) Hypermetropia
(c) Cornea
(d) Cataract

Question : A mirror has __ surface.
(a) rough
(b) polished
(c) dark
(d) all of these

Question : Rainbow is a natural phenomenon showing
(a)Reflection
(b)Deflection
(c)Dispersion
(d)Diversion

Question : In the retina of the eye, the area having no sensory cells is called
(a)iris
(b)Blind spot
(c)cornea
(d)Dark spot

Question : If light falls perpendicularly on a plane mirror, what will be the angle in which it will be reflected?
(a)45 degrees
(b)90 degrees
(c)180 degrees
(d)360 degrees

Question : Which of the following is not a luminous object?
(a)sun
(b)candle
(c)moon
(d)Tube light

Question : Which of the following results in diffused reflection?
(a) Plane mirror
(b) Shiny surface
(c) Silver
(d) Wood

Question : Kaleidoscope is based on the pattern of:
(a) reflection
(b) multiple reflection
(c) spectrum
(d) diffused reflection

Question : If the angle of incidence is 50°, then calculate the angle between the incident ray and the reflected ray.
(a) 50°
(b) 100°
(c) 130°
(d) 80°

Question : The perpendicular drawn to the reflecting surface is called
(a) normal
(b) incident ray
(c) reflected ray
(d) none of these

Question : Visually impaired people can read and write using:
(a) Degital pens
(b) Electronic writer
(c) Braille system
(d) Hearing aids

Question : To make a kaleidoscope we require
(a)Three plane mirrors
(b)Four plane mirrors
(c)Three glass sheets
(d)Four glass sheets

Question : In our eye _______cells can sense colour
(a)Rod
(b)Cone
(c)Both rod and cone
(d)Neither rod nor cone

Question : An owl can see clearly at night but not day time because it has
(a)More rods and few cones
(b)Less rod and more cones
(c)More rods and more cone
(d)Less rods and less cones

Question : The angle of reflection is equal to the angle of incidence
(a) Sometimes
(b) Always
(c) Never
(d) Under special case

Question : Band of seven colours is called
(a) VIBGYOR
(b) dispersion
(c) spectrum
(d) reflection

Question : What is the nature of image formed on the retina of human eye of an object?
(a) Virtual and erect
(b) Virtual and inverted
(c) Real and erect
(d) Real and inverted

Question : The cells present in the retina of eye and responding to colour are:
(a) Rod-shaped cells
(b) Both of these
(c) Cones
(d) None of these

Question : Far point of a normal human eye is situated at:
(a) 25 m
(b) 25 mm
(c) 25 cm
(d) Infinity

Question : With what is glass coated in order to convert it into a mirror?
(a) Silver
(b) Copper
(c) Aluminium
(d) Platinum

Question : What is the name of object through which light can pass?
(a) Opaque
(b) Translucent
(c) Transparent
(d) Luminous

Question : A mirror has ____ surface.
(a) rough
(b) polished
(c) dark
(d) all of these

Question : Which of the following is not a source of light:
(a) Tubelight
(b) The sun
(c) The moon
(d) Fire fly

Question : Beam of light, bounced back by the surface after falling on it is called
(a) Reflecting ray
(b) Incident ray
(c) Refracted ray
(d) normal

Question :Which Of The Following Represents The Correct Statements?
(a)Outer zone of complete combustion is the hottest part which is blue in colour.
(a) Middle zone of partial combustion is the moderate hot part which is yellow in colour.
(a)Innermost zone of unburnt wax vapours is least hot which is black in colour.
(a)All the above

Question :Mohan Is Writing Some Statements, Choose The Correct Statements And Help Him:
(a)Phosphorus is the only non-metal which catch fire if exposed to air.
(b)The lowest temperature at which a substance catches fire is called its ignition temperature.
(c)Combustion is a chemical process in which a substance reacts with oxygen to give off heat.
(d)All the above

Question :Consider The Following Statements, Choose The Incorrect One:
(a)The forest fires occur during the hottest summer day.
(b)It is very difficult to burn a heap of dry leaves.
(c)The head of matchstick contains only antimony tri-Sulphide and potassium chlorate.
(d)All the above

Question :The Substance That Does Not Burn With Flame Is:
(a)LPG
(b)Camphor
(c)Dry grass
(d)Charcoal

Question : A full length image of a distant tall building can definitely be seen by using
(a) a concave mirror
(b) a convex mirror
(c) a plane mirror
(d) both concave as well as plane mirror

Question :Plane mirror forms real image.

Question :Jugnu is a natural source of light.

Question :Light travels in a straight line.

Question :Plane mirror forms inverted image.

Question :Sunlight consists of seven colours.

Question :Reflection of light takes place in the same medium.

Question :Braille system is used by visually challenged people to read and write.

Question :Light is reflected from all surfaces.

Question :The size of the pupil is controlled by the iris.

Question :Angle of incidence” is always equal to the angle of reflection.

Question :Kaleidoscope works due to dispersion of light.

Question :Splitting of white light into its constituent colours by a prism is called dispersion.

Question :The light ray, which strikes any surface is called the reflected ray.

Question :When all the parallel rays reflected from a plane surface are not parallel, the reflection is known as diffused or irregular reflection.

Question :When an object is placed between two plane mirrors at 90° to each other, number of images formed will be ___________________ .

Question :A person 1 m in front of a plane mirror seems to be away from his image ___________________.

Question :If you touch your ___________________. ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with ___________________ .

Question :The normal makes an angle of ___________________. with the surface of the mirror.

Question :When beam of light stricking a smooth surface, gets reflected in one direction, it is called ___________________. reflected.

Question :The image which cannot be taken on a screen is called a ___________________. image.

Question :Splitting of white light into its seven constituent colours is called ___________________ .

Question :The size of the pupil becomes ___________________. when you see in dim light.

Question :According to law of reflection:
Angle of ___________________ = Angle of ___________________ .

Question :___________________. script is used by visually challenged people.

Question :Kaleidoscope is based on the principle of ___________________.

Question :Night birds have ___________________. cones than rods in their eyes.

Question :A plane mirror ___________________. all the light falling on it.

Question :___________________ no. of images are formed in plane mirror at right angle to each other.

Question :The transparent front part of eye is called ___________________.

Question :The size of the ___________________. is controlled by the iris.

Question :The eye lens focuses light on ___________________ .

Question :___________________. is the spot at the junction of the optic nerve and the retina where there are no sensory cells.