Chapter 14 Sources of Energy Solutions
Question - 21 : - On what basis would you classify energy sources as:
Answer - 21 : -
a. Renewable and non-renewable?
b. Exhaustible and inexhaustible?
Are the options given in (a) and (b) the same?
Answer
a) Renewable and non-renewable:
Renewable energy sources are those which replenish on their own and are easily available in nature. Like solar energy, tidal energy, wind energy, bio-mass.
Non-renewable energy sources are those which do not replenish on their own and have limited availability in nature. Like fossil fuels which includes petroleum, coal and natural gas.
b) Exhaustible and inexhaustible:
Exhaustible source of energy are those which deplete after few hundred years. Like coal and petroleum.
Inexhaustible source of energy are those which do not deplete and are available in abundant quantity. Like solar and wind energy.
Question - 22 : - What are the qualities of an ideal source of energy?
Answer - 22 : -
Following are the qualities of an ideal source of energy:
• It should be economical
• It should be easily available
• Pollution free
• Easy transportation and storage
• The amount of energy produced when burnt should be huge.
Question - 23 : - What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?
Answer - 23 : -
Advantages:
The heat source for a solar cooker is sunlight. It is a clean renewable and inexhaustible source of energy. As its availability is unlimited, it will be pocket-friendly.
Disadvantages:
It doesn’t work on a cloudy day.
Question - 24 : - What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?
Answer - 24 : -
Industrialization demands for more energy and to fulfil these demands fossil fuels are used as they are readily available. Due to their harsh usage, it has an impact on the environment. Too much exploitation of fossil fuels has led to greenhouse effect resulting in global warming.
But there are few possibilities of reducing this by reducing the usage of fossil fuels and opting for alternate sources of energy. Reduce the unnecessary usage of electricity and water. Opt for public transportation and lessen using own vehicles. These are a few small steps that can be implemented to reduce energy consumption.