Looking for CBSE Sample Paper Class 8 Science Light? If Yes here we are ready with CBSE Sample Question Paper Class 8 Science Light with Marking Scheme.
CBSE Sample Paper Class 8 Science Light
1.) Answer the short questions (15×1)
a.) What is incident ray?
b.) What is reflected ray?
c.) What is angle of incidence?
d.) What is angle of reflection?
e.) What happens when parallel rays fall into an irregular surface?
f.) What is regular reflection?
g.) Multiple reflection formation is used in which equipment?
h.) Sunlight consists of how many colours?
i.) What is dispersion of light?
j.) What is iris?
k.) What are the types of cells in our eye?
l.) What is blind spot?
m.) Who is Louis Braille?
n.) Who is Helen A. Keller?
o.) Name some visually impaired Indians who achieved great achievements.
2.) Briefly answer the following questions (5×3)
a.) Why can’t we see in dark?
b.) Describe the laws of reflection.
c.) Name the different parts of eye.
d.) List how to take care for eyes.
e.) What are the non-optical and optical aids for visually impaired?
3.) Fill in the blanks (10×1)
a.) _______ of _______ is the angle between the normal and incident ray.
b.) Parallel rays reflecting from a smooth surface is called _______ reflection.
c.) Irregular reflection is parallel rays reflecting from an _______ surface.
d.) Sunlight consists of ______ lights.
e.) Eye gets its distinctive colour by _______ .
f.) ______ cells help us to see in bright light.
g.) ______ cells help us to see in deemed light.
h.) ______ is the transparent part of the eye.
i.) Humans and butterflies have _____ types of eye.
j.) ______ method is used by visually impaired.
4.) Write true or false (10×1)
a.) Light can not be reflected by all surfaces.
b.) Dispersion is the splitting light into different constituents colours.
c.) Sunlight has only one colour.
d.) Braille system is used by visually impaired for reading and writing.
e.) Rod cells are light sensitive.
f.) Multiple reflection is used in kaleidoscope.
g.) All the animals have same type of eyes.
h.) “The story of my life” is written by Louis Braille.
i.) Lateral inversion is seen in plane mirror reflection.
j.) LalAdvani represented India in UNESCO.
Answers
1.) Answer the short questions (15×1)
a.) What is incident ray?
Answer –Incident ray is the light ray which falls on any surface.
b.) What is reflected ray?
Answer –When light ray falls on any surface it gets reflected, this reflected light ray is called reflect ray.
c.) What is angle of incidence?
Answer –Angle of incidence is the angle between normal and incident ray.
d.) What is angle of reflection?
Answer –Angle of reflection is the angle between normal light ray and reflected rays.
e.) What happens when parallel rays fall into an irregular surface?
Answer –When parallel rays fall into an irregular surface then it gets scattered and causes irregular reflection.
f.) What is regular reflection?
Answer –Regular reflection is the reflection of light rays from a smooth surface.
g.) Multiple reflection formation is used in which equipment?
Answer –In kaleidoscope multiple reflection formation is used.
h.) Sunlight consists of how many colours?
Answer –Sunlight consists of seven colours. They are violet, indigo, blue, green, yellow, orange, red.
i.) What is dispersion of light?
Answer –Dispersion of light is a process by which the light rays are divided into different constituents colours.
j.) What is iris?
Answer –Iris is a part of our eye which gives the eye it it’s distinctive colour.
k.) What are the types of cells in our eye?
Answer –There are two types of cell in our eye.
Rod cells and cone cells.
l.) What is blind spot?
Answer –Blind spot is the place between the optic nerve and the retina. Here no vision is possible hence the name blind spot.
m.) Who is Louis Braille?
Answer –Louis Braille developed the Braille system which the most popular resource for visually impaired person for reading and writing.
n.) Who is Helen A. Keller?
Answer –Helen A. Keller was a famous visually impaired author and lecturer. She wrote a number of books.
o.) Name some visually impaired Indians who achieved great achievements.
Answer –Some visually impaired Indians such as Ravindra Jain, LalAdvani achieved great achievements.
2.) Briefly answer the following questions (5×3)
a.) Why can’t we see in dark?
Answer – Our eyes alone cannot see any object. For seeing we need light emitting from an object or light reflecting from an object. In dark there is no light available so we can’t see. If a light source is introduced in dark then we can see properly.
b.) Describe the laws of reflection.
Answer –The laws of reflection is,
- The angle of incidence is always equal to the angle of reflection.
- The normal ray, the incident ray and the reflection ray all lies on the same plane.
c.) Name the different parts of eye.
Answer – The different parts of eye includes,
- Cornea
- Iris
- Retina
- Pupil
- Lens
- Optic nerve
d.) List how to take care for eyes.
Answer –Caring of eyes can be done by,
- We should studying or doing any work under dim light such as low power.
- We should use spectacles if necessary.
- We should never run our eyes. If dust particles enter our eye, rubbing it can cause harm to our eyes.
- We shouldn’t look directly at the Sun.
e.) What are the non-optical and optical aids for visually impaired?
Answer – The non-optical and optical aids for visually impaired are,
- Visual aids
- Tactual aids
- Hearing aids
- Electronic aids
Optical aids include,
- Bifocal lenses
- Contact lenses
- Tinted lenses
- Magnifiers
3.) Fill in the blanks (10×1)
a.) Angle of incidence is the angle between the normal and incident ray.
b.) Parallel rays reflecting from a smooth surface is called regular
c.) Irregular reflection is parallel rays reflecting from an irregular
d.) Sunlight consists of seven
e.) Eye gets its distinctive colour by iris .
f.) Cone cells help us to see in bright light.
g.) Rod cells help us to see in deemed light.
h.) Cornea is the transparent part of the eye.
i.) Humans and butterflies have different types of eye.
j.) Braille method is used by visually impaired.
4.) Write true or false (10×1)
a.) Light can not be reflected by all surfaces.
Answer – False
b.) Dispersion is the splitting light into different constituents colours.
Answer – True
c.) Sunlight has only one colour.
Answer – False
d.) Braille system is used by visually impaired for reading and writing.
Answer – True
e.) Rod cells are light sensitive.
Answer – False
f.) Multiple reflection is used in kaleidoscope.
Answer – True
g.) All the animals have same type of eyes.
Answer – False
h.) “The story of my life” is written by Louis Braille.
Answer – False
i.) Lateral inversion is seen in plane mirror reflection.
Answer – True
j.) LalAdvani represented India in UNESCO.
Answer –True