Standard Science Primary 4 Matter

Siti tried to push the plunger of a syringe filled with substance X. She found that she could not push the plunger in at all. What could substance X be?

A Oil or air
B Water or oil
C Air only
D Water only
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Worked Solution

Step 1: Identify that the plunger cannot be pushed (substance is incompressible). Step 2: Recall that solids and liquids cannot be compressed, while gases can. Step 3: Water and oil are liquids; air is a gas. Step 4: Therefore, X must be a liquid.

Correct answer: Water or oil

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