CBSE Worksheet for chapter - 8 Light Class 8

CBSE Worksheet for chapter - 8 Light Class 8

Worksheets For class 8

Find CBSE Worksheet for chapter-8 Light class 8

CLASS-8

BOARD: CBSE

PHYSICS Worksheet - 8

TOPIC: Light

For other CBSE Worksheet for class 8 Science check out main page of Physics Wallah.

SUMMARY

• Optics, Source of light, Medium of light

• Rectilinear propagation of light & behaviour of light at the interface of two media

• Characteristics of light, Reflection of light, Laws of reflection

• Regular and irregular reflection, Image and mirror

• Plane mirror and its uses, lateral inversion, Periscope, Kaleidoscope

• human eye and care of the eyes, Braille system

SECTION 1 – OBJECTIVE

1. Light causes the sensation of:

(A) Vision

(B) Light

(C) Both (A) and (B)

(D) None

2. Light is

(A) An electromagnetic radiation

(B) A longitudinal wave

(C) Mass less

(D) All of the above

3. Which of the following is a natural luminous source of light?

(A) Sun

(B) Wood

(C) Electric lamp

(D) Torch

4. Which of the following is not a translucent object?

(A) Greased paper

(B) Paraffin wax

(C) Frosted glass

(D) Water

5. Light shows:

(A) Random propagation

(B) Curvilinear propagation

(C) Rectilinear propagation

(D) None of these

6. Which of the following is a reflector of light?

(A) Sun

(B) Star

(C) Filament

(D) Moon

7. In case of diffused reflections, laws of reflection are ……..

(A) Followed

(B) Violated

(C) Both A and B

(D) None of these

8 The image formed by plane mirror is:

(A) Laterally inverted

(B) Virtual

(C) At a same distance behind the mirror as the object

(D) All of the above

9. If two plane mirrors are inclined at an angle of 60° then the number of images formed by the object place between these mirrors are:

(A) 4

(B) 3

(C) 5

(D) 6

10. Plane mirrors are arranged parallel to each other to get:

(A) A single image

(B) Two images

(C) A large number of reflected images

(D) No image

11. Which of the following statement is true?

(A) The angle of incidence is twice the angle of reflection

(B) The incident ray, the reflected ray and the normal drawn at the point of incidence lie in the same plane

(C) Some types of virtual images can be caught on the screen

(D) A plane mirror forms a real image

12. A virtual image is:

(A) Always real

(B) Always inverted

(C) Always caught on a screen

(D) Always uncapturable on a screen

13. In lateral inversion

(A) Right side of the object will be right side of the image

(B) Left side of the object will be left side of the image

(C) Upside of the object will be down side of the image

(D) Right side of the object will be left side of the image

14. Human eye has lens of

(A) Fixed focal length

(B) Variable focal length

(C) Variable refractive index

(D) Glass

15. The persistence of vision of the eye is:

(A) 1/16 second

(B) 1/10 second

(C) 1/26 second

(D) 1/100 second

16. In the human eye, which part of the eye receives the optical image of the object and then convert it to electrical pulses?

(A) Cornea

(B) Sclerotic

(C) Retina

(D) None of these

17. A human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to :

(A) Far-sightedness

(B) Near-sightedness

(C) Accommodation

(D) Persistence of vision

18. The human eye forms the image of an object at it’s:

(A) Cornea

(B) Pupil

(C) Iris

(D) Retina

19. Cones are present on:

(A) Cornea

(B) Eyelens

(C) Retina

(D) Optic nerve

20. A person can see nearby objects clearly but cannot see distant objects clearly. He is suffering from:

(A) Myopia

(B) Farsightedness

(C) Hypermetropia

(D) Astigmatism

SECTION 2 – SUBJECTIVE

1. What do you mean by reflection of light? What are the types of reflection write the laws of reflection ?

2. How is the image formed by a plane mirror? Explain with the help of a diagram

3. What do you mean by persistence of vision?

4. Explain the working of human eye with a neat and labelled diagram

5. Explain how you can take care of your eyes.

Solutions: to worksheet-8 Topic- Light

objective