Test: Energy conservation - Year 9 MCQ

Both biomass and natural gas rely on burning organic materials (biomass) or methane (gas) to produce heat. Therefore, option A is the correct answer as it correctly identifies energy resources that rely on burning to produce heat.

Coal burning decreases oxygen levels due to the consumption of oxygen in the combustion process.

Burning fossil fuels releases sulfur dioxide and nitrogen oxides, which can react with water vapor in the atmosphere to form acids. These acids contribute to acid rain, which can harm ecosystems by acidifying soil and water bodies.

Solar energy is converted into electricity through photovoltaic cells, also known as solar panels. These cells directly convert sunlight into electrical energy using the photovoltaic effect.

Hydroelectric power generates electricity by harnessing the kinetic energy of flowing water, typically from rivers or dams. Water flows through turbines, causing them to rotate and drive generators that produce electricity.