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STARS SCHOOL
Level : Primary 5
Subject : Science
Title : Unit 21 Revision
Day/date :
Name: __________________
Fill in the blanks with the correct answer.
1. Heat can be transferred through a vacuum by __________________________.
2. The transfer of heat in a fluid due to uneven densities in it is called
___________________________.
3. Heat is transferred through ________________________, ______________________
and ______________________________.
4. The _______________________________ we see in the sky is due to dispersion.
5. Red light travels the fastest so it refracts the ____________________________
Violet light travels the slowest so it refracts the ________________________.
6. Light of different colours travel at different ____________________________
so they refract at different ______________________________ in the medium.
7. The breaking up of white light into its component colours is known
as _____________________________.
8. Light bends because it changes its _________________________ as it enters
another medium.
9. The bending of light as it travels from one medium to another is
known as ____________________________.
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All answers must be in complete sentences.
1. How does a rainbow form?
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________
___
2. What is refraction?
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
3. How does the heat from the Sun reach the Earth?
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
4. How does heat travel?
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
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5. What is dispersion and how it occurs?
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
Define.
1. Conduction:
_____________________________________________________________________________
_____________________________________________________________________________
2. Convection:
_____________________________________________________________________________
_____________________________________________________________________________
3. Medium:
_____________________________________________________________________________
_____________________________________________________________________________
4. Radiation:
_____________________________________________________________________________
_____________________________________________________________________________
5. Refraction:
_____________________________________________________________________________
_____________________________________________________________________________
