Heat and Temperature - Revision

Which of the following are sources of heat? Tick all correct answers.

• Campfire

• Lit bulb

• Jacket

• Sun

Which of the following is the most possible room temperature in a classroom in Singapore?

•  $5\degree C$ 

•  $12\degree C$ 

•  $30\degree C$ 

•  $45\degree C$ 

When all the water in cup A is poured into cup B, the  temperature of the water in the end is most likely ______.

•  $35\degree C$  

•  $45\degree C$  

•  $55\degree C$  

•  $65\degree C$  

Two eggs of similar sizes were cracked into cups X and Y. Which egg will be cooked first?

• Egg in cup X

• Egg in cup Y

Two eggs of similar sizes were cracked into cups X and Y. In which cup will the egg be cooked faster?

• Egg in cup X

• Egg in cup Y

Henry placed this cup of hot water on his dining table. What would happen to the temperature of this cup of water after 3 hours? Explain your answer. (Choose the best answer)

• The temperature of the water will lose heat to the surroundings.

• The temperature of the water decreased as the water lost heat.

• The temperature decreased to room temperature as the water lost heat to the surroundings.

• The temperature of the water decreased as the water gained heat from the surrounding air.

Based on the diagram, which one of the thumbtacks will fall off last?

• Thumbtack 1

• Thumbtack 2

• Thumbtack 3

• Thumbtack 4

Some ice cubes were placed on the table. Which of the following best explains why the ice cubes melted?

• The surroundings lost heat to the ice cubes.

• The ice cubes gained heat from the surroundings.

• The ice cubes lost heat to the surroundings.

• The ice cubes lost coolness to the surroundings.

Read the thermometer. The temperature shown is _______ $\degree C$  

•  $21\degree C$  

•  $25\degree C$  

•  $25.5\degree C$  

•  $26\degree C$  

Box S's material has a special property for its function to allow the ice cubes to keep the drinks cold. What is this property?