Question detail
Which of the following statements about efficiency is true?
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. Efficiency can only be expressed as a percentage.
- B. Efficiency is always greater than 1.
- C. Efficiency is the ratio of useful energy output to total energy input.
- D. Efficiency measures the total energy consumed.
Answer
Efficiency is the ratio of useful energy output to total energy input.
Explanation
The correct option is "Efficiency is the ratio of useful energy output to total energy input.". Efficiency is the ratio of useful energy output to total energy input. is right because it directly matches Efficiency: (HT only) Describe ways to increase the efficiency of an intended energy transfer.. 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
Misunderstanding Efficiency Improvements
Students often think that increasing the input energy will always increase the efficiency of a system.
Emphasize that efficiency is about maximizing useful energy output relative to total energy input, and that reducing wasted energy is key to improving efficiency.
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