Light
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Laws of Reflection and Regular/Diffused Reflection
SubtopicLaws of Reflection and Regular/Diffused Reflection under Light for Grade 8 CBSE.
Preview questions (no answers)
- 1.
What is the result of parallel rays hitting an irregular surface?
A.They all reflect at
B.They reflect in parallel
C.They reflect in different directions
D.They pass through the surface
- 2.
The angle of incidence is measured between the incident ray and the:
A.Reflected ray
B.Surface of the mirror
C.Normal at the point of incidence
D.Horizontal axis
- 3.
Which of the following would produce a sharp, clear image?
A.Cardboard
B.Old wooden door
C.Polished steel plate
D.Clothing fabric
Download the worksheet for Light - Laws of Reflection and Regular/Diffused Reflection to practice offline. It includes additional chapter-level practice questions.
Multiple Images and the Kaleidoscope
SubtopicMultiple Images and the Kaleidoscope under Light for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Why are plane mirrors used in barbershops to show the back of the head?
A.Because they use refraction
B.Because of multiple reflections between two mirrors
C.Because they act as a kaleidoscope
D.Because they use concave reflection
- 2.
What is the main source of light for a kaleidoscope held in a room?
A.A battery inside the tube
B.External ambient light entering through the frosted end
C.Light produced by the glass pieces
D.Light from the viewer's eye
- 3.
If two mirrors are kept at (facing each other perfectly parallel), what is the theoretical number of images?
A.Zero
B.One
C.Ten
D.Infinite
Download the worksheet for Light - Multiple Images and the Kaleidoscope to practice offline. It includes additional chapter-level practice questions.
Dispersion of Light and Rainbow Formation
SubtopicDispersion of Light and Rainbow Formation under Light for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Which color in the visible spectrum has the highest frequency?
A.Red
B.Yellow
C.Green
D.Violet
- 2.
Which of the following is the correct order of colors in the spectrum, starting from Red?
A.Red, Orange, Yellow, Green, Blue, Indigo, Violet
B.Red, Green, Blue, Yellow, Orange, Indigo, Violet
C.Red, Yellow, Orange, Green, Indigo, Blue, Violet
D.Red, Orange, Green, Yellow, Blue, Violet, Indigo
- 3.
The refractive index of glass is for different colors of light.
A.The same
B.Different
C.Zero
D.Infinite
Download the worksheet for Light - Dispersion of Light and Rainbow Formation to practice offline. It includes additional chapter-level practice questions.
Structure and Working of the Human Eye
SubtopicStructure and Working of the Human Eye under Light for Grade 8 CBSE.
Preview questions (no answers)
- 1.
Which part of the eye is responsible for focusing light from distant and near objects onto the retina?
A.Cornea
B.Iris
C.Eye Lens
D.Optic Nerve
- 2.
What is the main purpose of blinking the eyes?
A.To change the focal length
B.To clear the blind spot
C.To keep the eyes moist and clean
D.To sense different colors
- 3.
Which of the following is a non-optical aid for visually challenged people?
A.Magnifiers
B.Contact lenses
C.Braille system
D.Telescopic aids
Download the worksheet for Light - Structure and Working of the Human Eye to practice offline. It includes additional chapter-level practice questions.
Care of Eyes and the Braille System
SubtopicCare of Eyes and the Braille System under Light for Grade 8 CBSE.
Preview questions (no answers)
- 1.
If you find it difficult to read the blackboard in class, what is the best course of action?
A.Ignore it
B.Ask a friend to read for you forever
C.Inform your parents and get an eye checkup
D.Sit even further away
- 2.
What is a 'Braille writer'?
A.A person who writes books for the blind
B.A machine similar to a typewriter used to produce Braille
C.A special pen that talks
D.A magnifying glass
- 3.
How is a Braille character 'read' by a person?
A.By listening to the paper
B.By running fingers over the raised dots
C.By smelling the ink
D.By tasting the dots
Download the worksheet for Light - Care of Eyes and the Braille System to practice offline. It includes additional chapter-level practice questions.