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STARS SCHOOL
Level : Primary 4
Subject : Science
Title : Unit 18 Revision
Day/date :
Name: __________________
Fill in the blanks with the correct answer.
1. An object can cast shadows of different _________________________ and
________________________, depending on the position of the object and
the position of the light source.
2. Wood, metal, some plastics, cardboard and clay that do not allow
any light to pass through them are called _______________________
materials.
3. Paper, plastic, cloth and frosted glass that allow some light to pass
through them are called __________________________ materials.
4. Glass and some plastics that allow light to pass through them are
called _______________________________ materials.
5. A simple ___________________________is a tube made up of two mirrors
which reflect light and enables us to see over walls and around
corners.
6. A __________________________ allows us to see objects that cannot be
seen directly from where we are.
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7. A ___________________________ allows us to see objects behind us.
8. More light can be reflected in the same direction from a
_________________________ surface, which makes it appear shinier.
9. We are able to see object around us because they
_________________________ light into our eyes.
10. Light travels from a _________________________, and travels in a
straight line.
All answers must be in complete sentences.
1. What are the different sources of light?
_________________________________________________________________________________
_________________________________________________________________________________
2. How does light travel?
________________________________________________________________________________
________________________________________________________________________________
3. How is light reflected from different surface?
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
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4. What are the properties of light?
________________________________________________________________________________
________________________________________________________________________________
5. What are transparent, translucent and opaque materials?
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
6. What affects the shapes and sizes of shadows?
________________________________________________________________________________
________________________________________________________________________________
7. How you noticed that under the sun, your shadow changes
throughout the day? Describe the changes.
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
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Define.
1. Opaque materials:
_________________________________________________________________________
_________________________________________________________________________
2. Periscopes:
_________________________________________________________________________
_________________________________________________________________________
3. Translucent materials:
_________________________________________________________________________
_________________________________________________________________________
4. Transparent materials:
_________________________________________________________________________
_________________________________________________________________________
5. Luminous objects:
_________________________________________________________________________
_________________________________________________________________________
