Energy Resources Quiz
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5 questions, one answer each
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1. A ball is thrown vertically upwards and then falls back down to its starting position. Which energy store increases as the ball rises?
- A. Gravitational potential energy store
- B. Kinetic energy store
- C. Chemical energy store
- D. Internal thermal energy store
2. Which of the following is an example of energy transfer by mechanical work?
- A. A kettle heating water using electrical current
- B. A person pushing a trolley across a floor
- C. A light bulb emitting energy by electromagnetic waves
- D. A microwave heating food using radiation
3. A car of mass 1000 kg is travelling at 20 m/s. Calculate its kinetic energy using Ek = ½mv².
- A. 10,000 J
- B. 100,000 J
- C. 200,000 J
- D. 400,000 J
4. A Sankey diagram shows that 100 J of chemical energy from fuel is input into an engine. 30 J is transferred as sound energy and 40 J is transferred as internal thermal energy. How much useful mechanical work is done?
- A. 30 J
- B. 40 J
- C. 30 J
- D. 70 J
5. A ball of mass 2 kg is lifted from ground level to a height of 5 m, then dropped. Using ΔEp = mgΔh and taking g = 10 m/s², at what height will the gravitational potential energy equal half of its maximum value?
- A. 1.25 m
- B. 2.5 m
- C. 3.75 m
- D. 5 m