1. A solar water heater cannot be used to get hot water on
(a) a sunny day.
(b) a cloudy day.
(c) a hot day.
(d) a windy day.
Solution :- (B) a cloudy day.
In cloudy day, sun rays are not so effective that's why water heater cannot be used to get hot water.
2. Which of the following is not an example of a bio-mass energy source?
(a) wood
(b) gobar-gas
(c) nuclear energy
(d) coal
Solution :- (C)
Nuclear energy is not an example of biomass energy because biomass is the waste of living organism but nuclear energy is not related to waste or remaining of livings.
3. Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy?
(a) geothermal energy
(b) wind energy
(c) nuclear energy
(d) bio-mass.
Solution :- (C)
4. Compare and contrast fossil fuels and the Sun as direct sources of energy.
Solution :- Fossil fuels
- Fossil fuels are those fuels which are found under the Earth's crust. It forms because
- of pressure and temperature.
- Fossil fuels are non-renewable source of energy.
- We need to use fossil fuels in limited way.
- Fossil fuels produce lots of a smoke and make environment polluted.
- Greenhouse effect are some causes of fossil fuels.
Solar energy
- These energy is radiant light and heat from the Sun.
- Solar energy is renewable source of energy.
- Solar energy is not in limited.
- It is available free of cost.
- Solar energy is quite eco friendly and useful as compared to fossil fuels.
5. Compare and contrast bio-mass and hydro electricity as sources of energy.
Solution :- Biomass
- Biomass is organic material that comes from plants and animals.
- This is renewable source of energy
- This source of energy is also eco friendly
Hydroelectricity
- Hydroelectricity are produced by water source.
- This is renewable source of energy.
- This source of energy is eco-friendly because it don't produce pollution but for generation of electricity, dam and reservoir is constructed which leads the depletion of flora and fauna.
6. What are the limitations of extracting energy from—
(a) the wind?
(b) waves?
(c) tides?
Solution :- (a) Limitations of extracting energy from winds are:-
- We need to install wind mills over a large area.
- Winds are not regular so this is not the continuous way of extracting energy.
- It cost so high in the installation of wind mills.
- Windmills can be established only at those place where the wind blow higher than 15 km per hour
(b) Limitations of extracting energy from waves
- The waves are generated by a strong wind blowing across the sea.
- A wide variety of devices have been developed to trap wave energy which cost so high.
- Waves are not available all the time so it is not continuous source of energy extraction.
(c) Limitations of extracting energy from tides are
- Very high tides are required to extract energy.
- It depends upon the relative positions of the Sun, Moon and the Earth.
7. On what basis would you classify energy sources as
(a) renewable and non-renewable?
(b) exhaustible and inexhaustible?
Are the options given in (a) and (b) the same?
Solution :- (a) Renewable energy :- The energy which are found in nature and forms again is known as renewable source of energy.
Example :- Sun, air, water, etc.
Non-renewable energy :- The energy which are found in nature but do not forms again after the use is known as non renewable energy.
Example :- coal, petroleum and natural gas etc.
(b) Exhaustible :- The source of energy which is exhaust after use and stock of these resources is limited is known as exhaustible.
Example :- coal, petroleum etc.
Inexhaustible :- The source of energy which is not exhaust after use and stock of these resources is not limited is known as inexhaustible.
Example :- biomass
Yes A and B are the same.
8. What are the qualities of an ideal source of energy?
Solution :- The qualities of an ideal source of energy are :-
- Available all the time, at all the places.
- Economically affordable
- Easy to store and transport
- Which would do a large amount of work per unit volume or mass.
- Be easily accessible.
9. What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?
Solution :- Advantages of using solar cooker are
- It is so cheap
- Food is not over heated so that nutrition of food become maintained.
- It requires little maintenance and work quite satisfactorily.
- It can be used in those type of places where electricity or other mean of cooking is not available.
Disadvantages of using solar cooker are
- We are not able to use it in night time.
- It also do not available when the day is cloudy or rainy.
- We just able to cook some foods like rice, daal, khichdi.
10. What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?
Solution :- There are lots of work for which energy is required and if these work increases
continuously then this leads to a reason of increasing demand for energy.
- Increases in population lead demand for more energy as population grow it need more energy for various purposes and that's will the reason of increasing demand for energy.
- Waste of energy also creates shortage in energy like wastage of electrical energy and so on.
- There are few people who have greed to collect all the resources of energy that also lead demand for energy.
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