Question detail
Which of the following statements is true regarding efficiency?
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 be greater than 100%.
- B. Efficiency is always a decimal between 0 and 1.
- C. Efficiency is the ratio of useful energy output to total energy input.
- D. Efficiency is not affected by wasted energy.
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: Convert efficiency values between decimals and percentages.. 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 Efficiency Formats
Students often confuse decimal and percentage formats for efficiency, mistakenly stating a decimal value as a percentage.
To fix this, remember to multiply the decimal efficiency by 100 to convert it to a percentage.
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