Question detail
A well‑insulated house loses less heat to the outside. Which statement best explains this?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Conservation and dissipation of energy
Question
- A. The house uses more useful energy to keep warm
- B. The insulation reduces the rate of heat transfer, so less energy is wasted
- C. The insulation increases the amount of wasted energy by trapping heat
- D. The insulation converts heat into electrical energy
Answer
The insulation reduces the rate of heat transfer, so less energy is wasted
Explanation
The correct option is "The insulation reduces the rate of heat transfer, so less energy is wasted". The insulation reduces the rate of heat transfer, so less energy is wasted is right because it directly matches Efficiency: Identify useful and wasted energy transfers in a device or process.. The other options are less suitable because they change the required Physics relationship, confuse the relevant energy store or use a distractor that does not answer the question.
Common mistake
Confusing useful and wasted energy
Students often label all energy moving through a device as useful, ignoring energy lost as heat or friction.
Explain that useful energy is that which performs the intended work (e.g., mechanical work, light, sound), while wasted energy is energy that leaves the system in less useful forms such as heat, sound, or vibration, and is not used for the device’s purpose.
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