Standard Science Primary 4 Matter

Siti has a syringe filled with 20 ml of air and 20 ml of water. She seals the tip of the syringe and pushes the plunger. Which of the following is likely to happen?

A The volume of both air and water decreases.
B The volume of water decreases but air remains the same.
C The volume of air decreases but water remains the same.
D Neither the volume of air nor water changes.
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Worked Solution

Step 1: Identify the states of matter: Air (Gas), Water (Liquid). Step 2: Recall properties: Gases can be compressed; liquids cannot. Step 3: Pushing the plunger reduces the space for air but not for water. Step 4: Result: Total volume decreases because air is compressed.

Correct answer: The volume of air decreases but water remains the same.

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