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FCAT Grade 8 Science Assessment Practice Questions

Category - FCAT Science Assessment Grade 8

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Even when the surrounding air is very warm, metal objects usually stay quite cool to the touch. Which of the following explains this phenomenon?
I. A high heat capacity
II. Low heat transfer rate between metal and air
III. Low electric conductance of metals
  1. I only
  2. II only
  3. III only
  4. I and II
  5. II and III
Explanation
Answer: D - Both the higher heat capacity of metal compared to air as well as the low heat transfer rate between metal and air are responsible for metal objects remaining cool despite warmer surrounding air. The heat transfer rate is the primary factor however. Heat transfers readily from solid to solid, or solid to liquid, but not as easily from gas to solid or gas to liquid.
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