AP Environmental Science Exam Practice Questions Exam Solved 100% Correct!!

A fuel's net energy yield is correctly defined as - a comparison between the cost of mining, processing, and transporting a fuel and the amount of useful energy the fuel generates A regular light bulb has an efficiency rating of 3 percent. For every 1 joule of energy that bulb uses, the amount of energy produced is - 0.03 joules of light Methane gas and ethanol are two examples of biogases that are produced in what process? - The anaerobic digestion of biomass Hybrid car engines have what motor? - Gasoline and electric powered engines What are ways to increase energy efficiency? - using low volume shower spray heads; insulating your home thoroughly; switching incandescent light bulbs to fluorescent bulbs; increasing fuel efficiency of vehicles; A typical coal-burning power plant uses 4,500 tons of coal per day. Each pound of coal produces 5,000 BTUs of electrical energy. How many BTUs are produced each day from this plant? - 4.5 X 10^10 What produces the least amount of carbon dioxide while generating electricity? - Wind turbines How much energy, in kWh, is used by a 100 wat computer running for 5 hours? -0.5 kWh Photovoltaic cells produce electricity by - using the sun's energy to create a flow of electrons in a material such as silicon A sample of radioactive material has a half-life of 20 years. It has an activity of 2 curies. How many years does it take for the material to have an activity level of .25 curies? - 60 yearsThe term vampire appliances correctly refers to appliances that - consume electricity even when they are not operating All non-renewable resource power plants use heat to - produce steam to turn electric generators