1. Which of the following scenarios provides the clearest evidence that energy is active in a system?
- A. A rock sitting still on the ground.
- B. A glass of water at room temperature.
- C. A light bulb that is lit up.
- D. A book resting on a table.
2. Which of the following scenarios provides the LEAST clear evidence of active energy transfer within the system described?
- A. An ice cube melting on a warm sidewalk.
- B. A car engine running while the vehicle is parked.
- C. A phone screen lighting up during an incoming call.
- D. A stationary bicycle parked in a garage.
3. What is the primary role of an "indicator" in the context of identifying energy?
- A. To create new energy from matter.
- B. To stop the flow of energy within a system.
- C. To provide a visible sign that invisible energy is present and active.
- D. To measure the exact temperature change caused by energy.
4. A student observes a pinwheel spinning on a windy day. What does the motion of the pinwheel primarily indicate?
- A. The pinwheel is creating its own energy.
- B. Energy is present and active in the wind and pinwheel system.
- C. The pinwheel is losing its color.
- D. The air has no energy.
5. When you plug in a cold toaster and the wires inside begin to glow red hot, what does this change signify?
- A. The toaster is broken and losing its metal.
- B. The toaster is reflecting red light from the room.
- C. Energy has been transferred to the wires, causing a change in temperature and light.
- D. The cold air around the toaster is being converted into heat.
6. Based on the fundamental principles described, what is the primary role of energy in the universe?
- A. To create matter from nothing
- B. To cause movement or produce a change
- C. To keep all objects in a static, unchanging state
- D. To generate light and sound exclusively
7. If a book is resting on a table and is not touched, what will happen to it according to the concept that energy is needed for change?
- A. It will slowly get warmer.
- B. It will begin to slide on its own.
- C. It will remain stationary.
- D. It will change color.
8. The text mentions that energy can produce a 'change'. Which of the following is the best example of energy causing a change, rather than just movement?
- A. A kicked soccer ball flying through the air.
- B. A piece of wood burning in a campfire.
- C. A car driving down a straight highway.
- D. A spinning top on a flat surface.
9. A rescue worker's flashlight is essential for a mission. What is the key requirement for this tool to remain functional throughout the mission?
- A. It must have a very bright bulb.
- B. It must be completely waterproof.
- C. It must have a reliable and continuous supply of energy.
- D. It must be made of a lightweight material for easy carrying.
10. A battery-operated toy car stops moving. According to the principles discussed, what is the most fundamental scientific reason for this?
- A. The car's wheels have become too dirty to turn properly.
- B. The floor surface has suddenly become too rough for the car to move.
- C. The device has exhausted its supply of energy needed to power its motor and create movement.
- D. The radio signal controlling the car has been interrupted by an external force.