Light, shadows and reflection Worksheet-3

Light, shadows and reflection Worksheet-3

 

Fill in the blanks:

  1. __________ is a source that enables to see the things around us.
  2. The sun and a light bulb are the example for ________ object.
  3. We will be able to see through these materials very clearly, if the material is ___________.
  4. Butter papers, a sheet of paper smeared with oil are example for __________ material.
  5. Materials that completely block light are called ________ materials.
  6. __________ is a process by which sound or light waves travel through a medium such as air or water.
  7. Light travels in a __________ line.
  8. When light rays are obstructed by ________ object that we get a shadow of the object.
  9. A _______ surface reflects a parallel beam of light incident upon it in all directions.
  10. The sun is ________ source of light.
  11. Shadows are formed when light rays are obstructed by _________ objects.
  12. A shadow only shows the________ (colour/shape) of the object.
  13. Size of the shadow_______________ remains (constant/may vary).
  14. A rough and bumpy surface is also called __________ surface.
  15. There are no 'bumps' on ______________ surface.
  16. Match the following:

 

Answer Key:

  1. Light
  2. Luminous
  3. Transparent
  4. Translucent
  5. Opaque
  6. Propagation
  7. Straight
  8. Opaque
  9. Rough
  10. Natural
  11. Opaque
  12. Shape
  13. May vary
  14. Irregular
  15. Highly polished or smooth or regular
  16. 1-e, 2-c, 3-a, 4-b, 5-d