Energy Quiz
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5 questions, one answer each
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1. A ball is thrown vertically upwards and returns to its starting position. Which energy stores are involved in this process?
- A. Chemical energy and gravitational potential energy only
- B. Kinetic energy and gravitational potential energy
- C. Kinetic energy, gravitational potential energy, and thermal energy
- D. Elastic energy and kinetic energy only
2. A car with a mass of 1500 kg travels at a speed of 20 m/s. Calculate its kinetic energy using Ek = ½mv².
- A. 150,000 J
- B. 300,000 J
- C. 600,000 J
- D. 30,000 J
3. A rock of mass 2 kg falls from a cliff and drops 45 metres before hitting the ground (g = 10 m/s²). What is the change in gravitational potential energy using ΔEp = mgΔh?
- A. 90 J
- B. 450 J
- C. 900 J
- D. 225 J
4. A student lifts a textbook from the floor to a shelf. Identify how energy is transferred during this process.
- A. By electromagnetic waves only
- B. By mechanical work (force × distance) done by the student's muscles
- C. By heating and sound waves
- D. By electrical current through the student's nervous system
5. A Sankey diagram shows that a light bulb receives 100 J of electrical energy input. Of this, 10 J is transferred as light energy and 85 J as thermal energy. What does the remaining 5 J represent, and why does it not violate the conservation of energy?
- A. It is lost and represents a violation of conservation of energy
- B. It is transferred by sound waves and other electromagnetic radiation; total energy output (10 + 85 + 5 = 100 J) equals input, confirming conservation
- C. It is stored as elastic potential energy in the filament
- D. It is converted to nuclear energy inside the bulb