WRITE THE DATE AND COPY THE QUESTIONS. Do you know the answer? Look for them in your notes.
1. What do we get by mixing the seven colours of the rainbow?
2. Which colour or colours does a green apple reflect?
3. Which colours does a black cat reflect?
4. What is the change of direction of light when it hits a surface.
5. What is the change of direction and speed of light when it changes from a transparent substance to another.
6. What is the name of the transparent material which refracts light.
7. Write an example of it.
8. What is the name of the materials which let some light pass through them?
9. Sound travels through a medium not in a ________.
10. Does sound travel faster through metal than through air?
11. Which property of sound refers to high and low?
12. How can you distinguish the sound of different objects?
13. What is the name of the reflection of sound near us?
14. What is an unwanted sound?
15. Which unit do we use to measure sound?
16. Which is faster: light or sound?
17. True or false: when white light passes through a glass prism, it is reflected into a spectrum of four colours.
18. Types of materials related to light.
19. Properties of sound.
20. The maximum loudness of noises for safety and good health is _______
21. It can deform an object, break it or change the way it moves.
22. It is used to make a work faster and easier.
23. It is produced when objects vibrate.
24. It is a non-contact force that attract iron and other metals.
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