GRADE 8 Science – Transformation of energy Quiz
1. Which of the following is an example of transformation of energy?
When you run, your body converts stored chemical energy into kinetic energy. Therefore, running is an example of transformation of energy.
2. What type of energy transformation occurs when a pendulum swings?
As a pendulum swings, potential energy (at the highest point) is transformed into kinetic energy (at the lowest point), and vice versa. Therefore, the correct choice is potential to kinetic energy.
3. Which of the following is an example of mechanical energy transformation?
When you ride a bicycle, your muscle power is converted into mechanical energy to propel the bike forward. Therefore, riding a bicycle is an example of mechanical energy transformation.
4. What kind of energy transformation is happening when a cell phone is being charged?
When a cell phone is being charged, the chemical energy stored in the battery is converted into electrical energy to charge the phone. Therefore, the correct choice is chemical to electrical energy.
5. Which of the following represents the transformation of electrical energy into light energy?
When you turn on a light bulb, electrical energy is transformed into light energy, resulting in illumination. Therefore, the correct choice is turning on a light bulb.
6. Which of the following is an example of transformation of energy?
Plants convert sunlight into chemical energy through the process of photosynthesis.
7. What type of energy transformation occurs when a battery-powered toy car moves?
The battery stores chemical energy which is converted into mechanical energy to move the toy car.
8. When a windmill converts wind energy into electrical energy, it is an example of which energy transformation?
The kinetic energy of the wind is transformed into electrical energy by the windmill's generator.
9. What happens to the energy conversion during friction?
Friction causes some of the energy to be transformed into heat, which is not useful for work.
10. In a hydroelectric power plant, what type of energy is being transformed into electrical energy?
The potential energy of water stored in a dam is transformed into mechanical energy and then into electrical energy by turbines.
11. What type of energy transformation occurs when a light bulb is turned on?
Electricity flowing through the filament of the light bulb is converted into light energy.
12. When a person eats food, what type of energy transformation occurs in the body?
The chemical energy stored in food is converted into thermal energy (heat) to maintain body temperature.
13. During respiration, what type of energy transformation takes place in living organisms?
Organisms convert chemical energy from food into mechanical energy for cellular activities.
14. When a car moves uphill, what type of energy transformation occurs?
The potential energy stored in the fuel is converted into mechanical energy to move the car uphill.
15. Which of the following represents the transformation of wind energy into electrical energy?
Wind turbines convert the kinetic energy of wind into electrical energy through a generator.
16. What type of energy transformation occurs when a phone is charged using a power bank?
The chemical energy stored in the power bank is converted into electrical energy to charge the phone.
17. When a person lifts weights, what energy transformation takes place?
The chemical energy stored in the person's body is converted into mechanical energy to lift the weights.
18. What type of energy transformation occurs when a wind-up toy jumps?
The mechanical energy from winding up the toy is converted into kinetic energy as it jumps.
19. In a solar panel, what type of energy is transformed into electrical energy?
Solar panels convert sunlight (solar energy) into electrical energy through photovoltaic cells.
20. When a ball is thrown into the air, what type of energy transformation occurs?
The mechanical energy used to throw the ball is converted into kinetic energy as it moves upward.
21. What happens to the energy during a mechanical energy transformation?
Energy is not created or destroyed but is transformed from one form to another during energy conversions.
22. When a flashlight is turned on, what type of energy transformation occurs?
The chemical energy in the battery is converted into light energy in the form of the flashlight beam.
23. Which energy transformation occurs when a radio plays music?
Electricity is converted into sound energy by the radio's speakers to produce music or sound.
24. What type of energy transformation takes place when the wind rustles tree leaves?
The kinetic energy of the wind is transferred to the leaves, causing them to move (mechanical energy).
25. When a phone battery is charged using a cable, what type of energy transformation occurs?
The electrical energy from the charging cable is converted into chemical energy stored in the phone's battery.
26. In a power plant, what type of energy transformation occurs to generate electricity?
In a power plant, the chemical energy of fuels like coal or gas is converted into electrical energy.
27. When a car engine is running, what type of energy transformation is taking place?
The chemical energy in fuel is converted into kinetic energy to power the movement of the car.
28. What effect does a resistor have on energy in an electric circuit?
A resistor converts electrical energy into heat energy, decreasing the overall energy in the circuit.
29. When a hammer strikes a nail, what type of energy transformation occurs?
The mechanical energy of the hammer hitting the nail is converted into sound energy.
30. During a lightning strike, what type of energy transformation occurs?
The accumulated potential energy in clouds is discharged as electrical energy in the form of lightning.
31. What happens to the energy during a process where a metal rod is heated?
The energy applied to the metal rod is transferred as heat energy, heating up the rod.