Standard Science Primary 4 Energy

Ravi wants to choose a material for a lunch box that can keep food warm for the longest time. Which property should the material have?

A It should be a good conductor of heat.
B It should be a poor conductor of heat.
C It should be a transparent material.
D It should be a magnetic material.
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Worked Solution

Step 1: To keep food warm, heat loss to the surroundings must be slowed down. Step 2: Poor conductors (insulators) slow down the rate of heat flow. Step 3: Therefore, a poor conductor is needed.

Correct answer: It should be a poor conductor of heat.

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