Standard Science Primary 4 Energy

Why do telephone wires appear tighter and shorter during a very cold night?

A The wires became heavier in the cold.
B The cold air pushed the wires closer.
C The wires lost heat and contracted.
D The wires gained heat and expanded.
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Worked Solution

Step 1: Cold temperatures cause materials to lose heat. Step 2: Heat loss causes solids like metal wires to contract. Step 3: Contraction makes them appear tighter.

Correct answer: The wires lost heat and contracted.

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