Heat and light test

Instructions for the test.

1. Keep your books and sit down with a piece of paper and a pen. You know this is a review to check how much you have learnt. Try not to copy. But remember this term you will be evaluate taking into account all your daily task, this test is just another task.
2. You don't need to copy the questions, just the answers. If you want to print it and fill it out, is perfect but you don't need it. You only need to write down your name, class number and the right answers.
3. Read it carefully, even twice if need it. Do not answer the questions without reading them. 
4. I think you are ready to start. Just relax and do it. 
5. When you finish downloaded in Google Drive and you will have the corrections. 😊

Heat and light Test Unit 5

Name                     Class            Number         

1. Say true or false?

a) Heat and temperature are the same thing. True / False
b) Thermal energy can make objects contract. True / False
c) Thermal energy can cause objects to change state. True / False
d) Light travels through the air in waves. True / False

2. Read and circle the correct answer.

When light energy from the Sun hits molecules of sand on the beach, the light energyis absorbed by the sand. This energy makes the molecules vibrate and the more light energy they absorb, the faster they vibrate. When we touch the sand, we feel the vibration as thermal energy, and the sand feels hot.

a) Sand molecules absorb thermal/ light energy from the Sun.
b) This energy makes the sand molecules move/ heat up.
c) We can / can’t feel the molecular movement in the sand as heat.

3. Write definitions. Include an example.

a) Melting: _____________________________________________
b) Evaporation: _____________________________________________
c) Transparent: _____________________________________________
d) Translucent: ____________________________________________
e) Opaque: _____________________________________________


4. Read about how thermal energy moves. Then answer the questions.

Thermal energy likes to move around. There are three ways that thermal energy can move; convection, radiation or conduction. Convection occurs when thermal energy moves because matter is moving. For example, when an area of warm air is heated by the sun and rises, or when warmer liquid rises to the top of a cooking pot as the pot is heated. Radiation occurs when there is no matter for thermal energy to move through,for example in space. This is how thermal energy travels between the Sun and the Earth’s atmosphere. Finally, thermal energy can move by conduction. This occurs when thermal energy passes from one object to another when they are touching each
other. For example, when you touch an ice cube, thermal energy passes from your
fingers to the ice cube, melting it.

a) In what ways can thermal energy move? ____________________________                            
b) What is the name for the transfer of thermal energy caused by the movement of
matter? _____________________________________________
c) What type of energy transfer takes place when you stand on warm sand and your
feet get hotter? _____________________________________________

5. Put the words in the correct order and make right sentences.

a) Source torch is a light a of.
_____________________________________________
b) Heat of a cooker a is source.
_____________________________________________
c) Light the heat Sun is a of source and.
_____________________________________________
d) Every day sources light we heat need of and.
_____________________________________________