Q.1
What are biofuels made from?
  • Coal
  • Oil
  • Gas
  • Animal and plant material
Q.2
Biogas is primarily made up of which gas?
  • Methane
  • Oxygen
  • Carbon dioxide
  • Hydrogen
Q.3
Biogas is made by which process?
  • Aerobic respiration
  • Alcoholic fermentation
  • Anaerobic fermentation
  • Respiration
Q.4
Biogas generators can be filled with which of the following?
  • Air
  • Water
  • Feces
  • Nitrogen
Q.5
In a biogas generator, what does the animal or plant material supply?
  • Carbohydrate (sugar)
  • Protein
  • Fat
  • Water
Q.6
Methane is a greenhouse gas and contributes to...
  • the weather
  • global warming
  • ozone depletion
  • respiration
Q.7
Which of the following is caused by global warming?
  • Increased temperature of the Earth
  • Rise in sea levels
  • Increased biodiversity
  • Climate change
Q.8
What is biodiversity?
  • The number of species
  • The population of humans
  • The variety of birds
  • The number of trees
Q.9
Biogas is produced at a faster rate if the temperature is...
  • increased
  • decreased
  • unchanged
  • heated for longer
Q.10
Biogas generators are useful in developing countries such as Africa, because they easily and cheaply get rid of what?
  • Fuel
  • Air
  • Waste
  • Soil
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