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Sources of Energy Test - 29

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Sources of Energy Test - 29
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  • Question 1
    1 / -0
    Biogas is a mixture of:
    Solution
    Biogas is a mixture of combustible gases mainly methane formed by the decay of the organic matter in a controlled environment. Typical composition of a biogas is methane (50-75%), carbon dioxide (25-50%), nitrogen (0-10%) and hydrogen (0-1%) and other gases in trace amounts.
  • Question 2
    1 / -0
    What is not required in the formation of biogas in a biogas plant?
    Solution
    Biogas production is a type of anaerobic fermentation. Anaerobic means without oxygen.
  • Question 3
    1 / -0
    Destruction of large ecosystems occurs during the harnessing of:
    Solution
    To produce hydroelectricity, high-rise dams are constructed on the river to obstruct the flow of water and thereby collect water in larger reservoirs
    The dams can be constructed only in a limited number of places, preferably in hilly terrains. Large areas of agricultural land and human habitation are to be sacrificed as they get submerged. Large ecosystems are destroyed when submerged under the water in dams. The vegetation which is submerged rots under anaerobic conditions and gives rise to large amounts of methane which is also a greenhouse gas. It creates the problem of satisfactory rehabilitation of displaced people.
  • Question 4
    1 / -0
    A certain form of energy does not cause any pollution and is easily converted into electricity. It is not obtained directly or indirectly from the Sun. It is technically very difficult and expensive to obtain this form of energy and it is not available everywhere. What is this form of energy called?
    Solution
    Geothermal thermal energy is the heat energy available within the Earth. However, this energy is not equally available everywhere and is concentrated in some parts of the world such as natural geysers. The extraction of geothermal energy is a costly process.
  • Question 5
    1 / -0
    The main constituent of bio-gas is
    Solution

  • Question 6
    1 / -0
    The energy of water is called.
    Solution
    Energy available in water is commonly termed as Hydro energy.  
    Option B
  • Question 7
    1 / -0
    The resource that can be used again and again after due processing are called.
    Solution

  • Question 8
    1 / -0
    What is the main constituent of biogas?
    Solution
    Biogas is an excellent fuel as it contains up to $$75\ \%$$ methane. It burns without smoke, leaves no residue like ash in wood, charcoal, and coal burning. Its heating capacity is high. Bio-gas is also used for lighting
  • Question 9
    1 / -0
    Fuels that provide most of the energy needs of the world is:
    Solution
    As per the given diagram, most of the energy consumed around the world comes from coal and petroleum followed by natural gas and renewable resources.

  • Question 10
    1 / -0
    A good fuel should :
    Solution
    A good source of energy would be one 
    • which would do a large amount of work (supply energy) per unit volume or mass over a long period of time,
    • be easily accessible, 
    • be easy to store and transport, and 
    • have low content of non-combustibles and no combustion products that are poisonous or environmental pollutants
    • perhaps most importantly, be economical.
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