HOTS Science Primary 4 Matter

A sealed 1-litre metal container is completely filled with water. If 200 cm³ of water is removed and replaced with 200 cm³ of oil, which statement is true?

A The air inside the container will expand.
B The total mass remains exactly the same.
C The volume of water remaining is 800 cm³.
D The container can now be compressed.
Show Worked Solution

Worked Solution

Step 1: 1 litre = 1000 cm³. Step [2-9]: 1000 cm³ - 200 cm³ = 800 cm³ of water. Step [2-9]: Since the container is sealed and the 200 cm³ removed was replaced by another liquid (oil), the volume of water is 800 cm³.

Correct answer: The volume of water remaining is 800 cm³.

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