Question detail
Which of the following statements best describes 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 is the ratio of useful energy output to total energy input.
- B. Efficiency is the total energy input divided by useful energy output.
- C. Efficiency is always 100% in real-world applications.
- D. Efficiency cannot be expressed as a decimal.
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: Express efficiency as a decimal.. 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 Representation
Students often express efficiency as a fraction instead of a decimal.
To express efficiency as a decimal, divide the useful energy output by the total energy input and ensure the result is in decimal form.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.