Froggy Jumps Energy EfficenyVersión en línea Energy efficency quiz por Luke Chaser 1 What is energy efficiency? a A) The total amount of energy used b B) The amount of energy wasted c C) How much useful energy is produced compared to input energy 2 Which of the following is the correct formula for efficiency? a A) Output ÷ Input b B) Input ÷ Output × 100 c C) Useful Output ÷ Total Input × 100 3 A machine receives 1000 J of energy and produces 400 J of useful energy. What is its efficiency? a 60% b 25% c 40% 4 What is the main reason energy is lost in machines? a Gravity b Electricity c Friction 5 5. Which form of energy is most commonly wasted in machines? a Chemical b Light c Heat 6 6. Why does a ball not bounce back to its original height? a Energy is destroyed b Gravity stops working c Some energy is lost as heat and sound 7 Which of the following is the MOST energy-efficient transport? a Petrol car b Monster truck c Bicycle
