Energy Resources and Conservation Quiz

Grade 8 · Science · Quiz

Test your understanding of energy sources, their environmental impacts, and energy conservation strategies.

Questions

1. Which of the following correctly lists three fossil fuels?

   1. Solar, wind, geothermal
   2. Coal, oil, natural gas
   3. Uranium, coal, wind
   4. Hydroelectric, biomass, coal
   Show answer

   Answer: Coal, oil, natural gas

   Coal, oil, and natural gas are the three main fossil fuels, all formed from ancient organic matter over millions of years.

2. A solar panel converts solar energy into which form of energy?

   1. Chemical energy
   2. Nuclear energy
   3. Electrical energy
   4. Mechanical energy
   Show answer

   Answer: Electrical energy

   Photovoltaic cells in solar panels use the photoelectric effect to convert light (photons) directly into electrical energy (electron flow).

3. Nuclear energy is considered a renewable energy source because it produces no CO₂ during operation.

   Show answer

   Answer: False

   Nuclear energy relies on uranium, a finite mined resource — making it nonrenewable. While it produces minimal operational CO₂, the uranium supply is limited.

4. Which of the following is the best example of energy conservation?

   1. Leaving lights on all night
   2. Replacing incandescent bulbs with LEDs
   3. Increasing thermostat settings in summer
   4. Buying a larger car
   Show answer

   Answer: Replacing incandescent bulbs with LEDs

   LED bulbs use up to 75% less energy than incandescent bulbs for the same light output, making them one of the most effective energy conservation tools.

5. Hydroelectric power plants generate electricity by:

   1. Burning water to create steam
   2. Using the force of moving water to turn turbines
   3. Splitting water molecules using lasers
   4. Heating water with geothermal vents
   Show answer

   Answer: Using the force of moving water to turn turbines

   Hydroelectric plants use the gravitational potential energy of water held in a reservoir; as water flows down through turbines, it generates electricity.

6. The energy source that harnesses heat from deep within Earth is called ______ energy.

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   Answer: geothermal

   Geothermal energy uses heat from Earth's interior — produced by radioactive decay and residual planetary heat — to generate steam and drive turbines.

7. What is a major environmental disadvantage of burning coal?

   1. It produces too much electricity
   2. It releases CO₂ and sulfur dioxide, causing pollution and climate change
   3. It is too expensive to extract
   4. It requires too much water to operate
   Show answer

   Answer: It releases CO₂ and sulfur dioxide, causing pollution and climate change

   Burning coal releases CO₂ (greenhouse gas), sulfur dioxide (acid rain), nitrogen oxides, and particulate matter — major sources of air pollution and climate change.

8. According to the law of conservation of energy, when a car brakes, the kinetic energy is converted into:

   1. Chemical energy stored in the battery
   2. More kinetic energy for acceleration
   3. Mainly heat energy due to friction
   4. Nuclear energy
   Show answer

   Answer: Mainly heat energy due to friction

   When brakes are applied, friction between brake pads and rotors converts kinetic energy into thermal (heat) energy — consistent with conservation of energy.

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