Posttest
Direction: Read the questions carefully. Choose the letter of the correct answer then write them
on page 10 of this modulo.
KWARTER
Pangkat
1. Which of the following materials is a good conductor of heat and slectricity
A aluminum casserole
C. plastic tray
B. pot holder
D. wooden spoon
2. Why are electrical wires usually made of copper?
A. It is shiny
C. It is not magnetic.
B. It conducta electricity.
D. It is cheap
3. What is the main reason why aluminumn is used as a material in making cooking pans?
A. It is a good conductor of heat.
B. It is a good conductor of electricity.
C. It has a very high density.
D. It is a strong material.
4. Why are electrical wirings usually covered with a layer of plastic?
A. To make it look pretty. C. To help electricity flow along the wire.
B. To make it strong.
D. To make it safe.
5. The following are characteristics of materials that are good conductors of heat and
electricity EXCEPT one. Choose the letter only.
A. Thermal conductivity
B. Porosity
C. Malleability
D. Ductility​