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Sources of Energy Test - 15

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Sources of Energy Test - 15
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  • Question 1
    1 / -0
    Hydroelectric plants interfere with the natural eco-systems.  
    Solution
    Hydroelectric power includes both massive hydroelectric dams and small run-of-the-river plants. Large-scale hydroelectric dams continue to be built in many parts of the world.
    Flooding land for a hydroelectric reservoir has an extreme environmental impact: it destroys forests, wildlife habitats, agricultural land, and scenic lands. 
    Global warming emissions are produced during the installation and dismantling of hydroelectric power plants.
  • Question 2
    1 / -0
    65% by volume is hydrogen gas in the biogas. 
    Solution
    Biogas is a mixture of methane, carbon dioxide, hydrogen, and hydrogen sulfide produced by the decomposition of plant and animal waste, that is used as fuelBiogas 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.
  • Question 3
    1 / -0
    Coal and petroleum are called fossil fuels.      
    Solution
    Answer is A.

    The fossil fuels we use today are actually formed from plants and animals that existed hundreds of millions of years ago. Coal and petroleum are made of dead matter buried under the earth for many years. The dead and decaying matter under great amount of pressure and temperatures turn into fossils and they both are used as fuels, called fossil fuels.
    Hence, the given statement is true.
  • Question 4
    1 / -0
    The gas that is obtained by the fermentation of biomass is :
    Solution
    Biomass is fuel that is developed from organic materials, a renewable and sustainable source of energy used to create electricity or other forms of power. The gas obtained by the fermentation of biomass is called biogas.

  • Question 5
    1 / -0
    The super heated steam is raised in geothermal plants by the heat of:
    Solution
    The heat from the earth's core continuously flows outward. It transfers (conducts) to the surrounding layer of rock, the mantle. When temperatures and pressures become high enough, some mantle rock melts, becoming magma. Then, because it is lighter (less dense) than the surrounding rock, the magma rises, moving slowly up toward the earth's crust, carrying the heat from below.
    Sometimes the hot magma reaches all the way to the surface, where we know it as lava. But most often the magma remains below the earth's crust, heating nearby rock and water (rainwater that has seeped deep into the earth) - sometimes as hot as 700 degrees F. Some of this hot geothermal water travels back up through faults and cracks and reaches the earth's surface as hot springs or geysers, but most of it stays deep underground, trapped in cracks and porous rock. This natural collection of hot water is called a geothermal reservoir.
    Hence, the super-heated steam is raised in geothermal plants by the heat of magma or lava.
  • Question 6
    1 / -0
    The non-renewable source of energy amongst the following is :

    Solution
    Answer is D.

    A non-renewable resource (also called a finite resource) is a resource that does not renew itself at a sufficient rate for sustainable economic extraction in meaningful human time-frames. An example is carbon-based, organically-derived fuel. The original organic material, with the aid of heat and pressure, becomes a fuel such as oil or gas. Earth minerals and metal ores, fossil fuels (such as coal, petroleum, and natural gas), nuclear fuels, and groundwater in certain aquifers are all non-renewable resources.
    Natural resources such as coal, petroleum (crude oil) and natural gas take thousands of years to form naturally and cannot be replaced as fast as they are being consumed. Eventually it is considered that fossil-based resources will become too costly to harvest and humanity will need to shift its reliance to other sources of energy. 
    Hence, fossil fuels are non-renewable resources.
  • Question 7
    1 / -0
    In a wind mill the electric energy is converted into mechanical energy.         
    Solution
    The answer is B.
    Windmills, like waterwheels, were among the original prime movers that replaced animal muscle as a source of power. They are used for centuries in various parts of the world, converting the energy of the wind into mechanical energy for grinding grain, pumping water, and draining lowland areas.
    The kinetic energy of the wind is transformed into the mechanical energy of the turning windmill. This can be used to turn the coil of a generator to generate electricity. The original energy to cause the wind to blow came from the sun. Uneven heating of the earth's surface causes wind.
    So basically, a windmill generates electrical energy from mechanical energy, not the other way round. 
    Hence, the statement is false.
  • Question 8
    1 / -0
    The sources of energy which are being produced continuously in nature and which are inexhaustible are called:
    Solution
    Non-conventional sources are abundant in nature and are being replenished. Example: solar energy, tidal energy, wind energy.
  • Question 9
    1 / -0
    Which of the following is an important source of light for us?
    Solution
    Sun is the most important source of light for us.
    The Sun is the nearest star to us. It is continuously emitting huge amounts of heat and light. The Sun is the source of almost all energy on the Earth. In fact, the Sun is the main source of heat and light for all the planets.
    The planets look like stars, but they do not have the light of their own. They merely reflect the sunlight that falls on them.
    Stars emit light of their own. The Sun is also a star. But the stars are millions of times farther away than the Sun.
  • Question 10
    1 / -0
    .......... is formed by the transformation of trees buried inside the earth millions of years ago.
    Solution
    On land, when trees are buried inside the earth millions of years ago and due to high temperature and pressure, these get converted into coal.

    Diesel is formed from crude oil, which is formed from the plants and aquatic animals in the oceans when buried for millions of years.
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