The City School
End of Unit Test
Topic: Sound & Energy
[ Total Marks :
Name:
/18]
Sec:
Q1. The picture shows a container called a water cooler.
[ /6]
The container is made of clay.
a. The water in the container soaks into the clay, making the outside wet. Water evaporates from the outside,
cooling the container. Explain how evaporation cools a liquid.
[3]
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b. As the exterior cools, heat energy moves through the clay, conducted from the container's interior. Describe the
process of heat conduction in solids and what factors influence its effectiveness.
[3]
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Q2. This question is about heat and temperature.
a. Describe the difference between heat and temperature.
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[ /6]
[1]
b. The diagram shows how a room can be heated. The arrows show the direction of air movement. [3]
Use the diagram to complete the sentences.
i. At A warm air rises because it is _________________________.
ii. At B cool air sinks because it is __________________________.
iii. The process is called _____________________.
c. The diagram shows a copper rod being heated. Explain how the heat is transferred through the copper rod.
Use ideas about particles in your answer.
[2]
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Q3. Heat transfer takes place through conduction, convection, or radiation.
[ /6]
a. A vacuum flask can keep hot liquids hot and cold liquids cold. To keep water hot the flask must stop heat loss by
conduction, convection, and radiation.
[2]
Describe how each part of the vacuum flask will stop heat dissipation. Also, mention the thermal processes.
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b. Before the invention of modern pumping air systems, fires were sometimes used to help ventilate mines. A fire was lit at
the bottom of the ventilation shaft to make sure that fresh air flowed into the mine through the access shaft, as shown in
the diagram.
[4]
The passage explains the movement of air in the mine. Use the words from the box to complete the passage. Each word
may be used once, more than once, or not at all.
conduction
contracts
convection
faster
decreases
expands
slower
increases
Air is heated by the fire and the air molecules move_____________________________.
The air_______________________ as the molecules move further apart.
The density of the air _____________________and the hot air rises.
Cold air flows in to replace the hot air and the process continues as a ____________________ current.