P4 17/7 Quiztopia 3.1

• Hello students! This quiz is testing on how heat flows and also the effects of expansion and contraction in daily life! Try not to attempt the quiz more than once, as we will only count your answers from your FIRST attempt! No bubbles will be awarded for multiple attempts :) All the best!

• Ready!

• Not ready!

A cup of hot chocolate was left in a room for 40 minutes. Which one of the graphs represents the change in the temperature of the hot chocolate over 40 minutes?

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Iris put a glass of ice in an air-tight box as shown in the diagram.

Which one of the following statements is correct about the air in the box?

• (1) The air in the box will gain heat from the ice and expand.

• (2) Coldness is transferred from the ice to the air in the box.

• (3) The air on the box will lose heat to the ice and become cooler.

• (4) The air in the box will gain heat from the glass and become warmer.

As Sam was walking to school, he saw electric cables that are fixed tightly on the poles as shown in the diagram.

What do you think will happen to the cables in the cold weather?

• (1) The cables will not function properly as they are too tight.

• (2) The length of the cables will remain the same in the cold weather.

• (3) The cables will lose heat to the surroundings and contract, causing them to snap in the cold weather.

• (4) The cables will gain heat from the surroundings and expand so they will hang loosely in the cold weather.

When Ginny reached home on a hot day, she realised that the tiles on her floor in her home had buckled. The flooring of Ginny’s house was lined with tiles attached to one another.

Complete the sentences in the next few questions with the appropriate words/ phrases to explain why the tiles buckled on a hot day. [2]

On a hot day, the tiles ______ heat

from the ______ ____________

As there were __ ____ between the tiles,

the _________ of the tiles caused the tiles to buckle. 

State what can be done to prevent the tiles from buckling. [1]