Energy Efficiency

Energy Efficiency Quiz

Spec 4.1.2.2 · AQA GCSE Physics: Quiz

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5 questions, one answer each

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  1. 1. Efficiency is calculated as:

    • A. total input / useful output
    • B. useful output / total input
    • C. useful output × total input
    • D. total input − useful output

  2. 2. Efficiency can be expressed as:

    • A. A decimal only
    • B. A percentage only
    • C. Either a decimal or a percentage
    • D. A whole number greater than 1

  3. 3. A kettle is supplied with 500 J and produces 400 J of useful thermal energy in the water. What is its efficiency?

    • A. 0.2
    • B. 0.5
    • C. 0.8
    • D. 1.25

  4. 4. Which of these reduces unwanted energy transfer due to friction?

    • A. Thermal insulation
    • B. Lubrication
    • C. Increasing current
    • D. Increasing voltage

  5. 5. (HT) A design engineer wants to increase the efficiency of a car engine's intended energy transfer. Which change would help?

    • A. Removing the lubricant
    • B. Reducing friction between moving parts
    • C. Increasing the mass of the engine
    • D. Increasing the total energy input without changing output

Quiz