NCERT Class 10 Science Chapter 14 Sources of Energy Question Answer Solution For School Students of Class 10th. We also Provides Notes and Important Questions for Class 10 Science. NCERT Class 10th Science book is applied in mostly boards like CBSE, HBSE, RBSE, Up Board, MP Board and also some other state boards. Class 10 Science Chapter 14 Chapter Inside Questions Solution.
Also Read:- Class 10 Science NCERT Solution
NCERT Class 10 Science Chapter 14 Sources of Energy Textual Question and Answer for CBSE, HBSE and Other Boards Solution.
Sources of Energy Class 10 Science Question Answer
Q. 1. A solar water heater cannot be used to get hot water on a:
(a) sunny day;
(b) cloudy day;
(c) hot day ;
(d) windy day.
Ans. (b) Cloudy Day
Q. 2. Which of the following is not an example of a bio-mass energy source ?
(a) wood ;
(b) gobar gas ;
(c) atomic energy ;
Ans. (c) atomic energy.
Q. 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) fossil fuel ;
Ans. (c), i.e., fossil fuel. Rest all are ultimately derived from sun’s energy.
Q.4. Compare and contrast fossil fuels and the sun as sources of energy.
1. Both are natural sources of energy.
2. Both are widely used sources of energy.
3. Least technology is required to get energy by any of the sources.
Dissimilarities/ contrast :
1. Sun’s energy can be used only during day but fossil energy can be used any during day or during night.
2. Solar energy is almost free where, as fossil energy costs much.
3. Infinite amount of solar energy is available almost free of cost whereas there is a time limited stock of fossil fuel.
4. Solar energy is a renewable source of energy where as it takes millions of year to produce fossil fuel.
5. Solar energy is totally pollution free where, as fossil fuel produces a lot of pollution.
Q. 5. Compare and contrast bio-mass and hydroelectricity as a source of energy.
Ans. Similarities :
1. Hydroelectricity is totally pollution free whereas bio-mass source produces a little pollution if properly used.
2. Both are renewable sources of energy.
3. Working cost of both sources is very low. However initial cost of hydroelectric source is more than biomass source.
1. Bio-mass plants can be established in very less space and be established almost anywhere. However a lot of space is required for establishing a hydroelectric plant.
2. Large area of land get submerged under water in hydroelectric plant whereas a very small area is used for bio-mass plants.
3. Lot of ecological problems occur in hydroelectric plant where as biomass plant is almost problem free.
4. Very large of people are rendered homeless due to hydroelectric plants. Practically no displacement of population is there in biomass plants.
5. Specific location is required for hydroelectric at Plants. These can only be established very high altitude. Biomass plants can be established any where.
6. Initial cost of hydroelectric plants is millions time the initial cost of bio-mass plants.
7. Energy got from hydroelectric plant is much more than energy got from biomass plant.
Q. 6. What are the limitations of extracting energy from
(a) the wind ?
(b) waves ?
(c) tides ?
(a) Limitations of extracting energy from winds :
1. It requires a lot of space.
2. It is not available everywhere and at all the times.
3. It may result in huge wear and tear.
4. Wind velocity must be sufficient. It should never be less than 15 km h-1.
(b) Limitations of extracting energy from waves.
1. Waves are possible only when a strong wind is blowing over the surface of sea whereas tides depend upon the attraction of moon.
2. It is a very costly affair and difficult to manage it in sea.
(c) Limitations to getting from tides.
1. It cost is huge and is not possible to build such dams everywhere.
2. It is difficult to maintain and operate tidal wave dams deep in the sea.
3. Huge amount of silt gets deposited in the basis of the dam.
Q.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 ?
Ans. Sources of energy that will get depleted some day are said to be exhaustible sources or non-renewable sources of energy.
Sources from which we can be assured of constant supply of energy at a particular rate
i.e., the sources which can be regenerated are called renewable sources of energy. Inexhaustive or renewable energy is one for which the depletion of the reservoir because of extraction of useable energy is practically negligible.
We are getting energy from sun for last five billion years and we go on getting it for another five billion years, therefore we can say solar enegy is inexhaustible or renewable. Coal reserve with us are for about 200 years whereas it will take millions year for it to form again, hence coal may be said to be exhaustible or non-renewable source of energy.
Q. 8. What are qualities of an ideal source of energy ?
What are the characters of a good source of energy ?
Ans. The properties of an ideal source of energy are :
1. It should not cause any pollution.
2. It should be readily available at economical rate.
3. It should be easy to store and should not produce any hazards during transportation. 4. It should evolve energy at controllable rate.
5. It should not leave any residue.
6. It should evolve energy easily.
7. Calorific value of fuel (energy emitted per unit mass) should be large.
Q. 9. What are the advantages and disadvantages of using a solar cooker ? Are there places where solar cookers have limited utility ?
Ans. Advantages of using solar cooker.
1. It does not produce any pollution.
2. Its working cost is virtually zero.
3. It saves fuel.
4. Since the food is cooked at comparatively low temperature, hence nutrients of food are not destroyed during cooking.
5. More than one item can be cooked at the same time.
6. In India we have best sun shine.
1. Solar energy is not available in sufficient amount all the times. It cannot be used at night time and on cloudy days.
2. Direction of solar cooker has to be changed time and again.
3. It cannot be used for frying purpose.
4. It cannot cook chapatis. Solar cookers cannot be used at places where there is not sufficient amount of sun shine. It cannot be used in inner rooms on ground floor.
Q. 10. What are environmental consequences of the increasing demand for energy ? What steps would you suggest to reduce energy consumption ?
Ans. The demand of energy is increasing day by day. Exploiting any source of energy may disturb the environment in one way or other. For example, getting energy from fossil fuel may cause lot of pollution in air. Getting energy by nuclear fission may create problem of disposal of nuclear waste.
Steps for reducing energy consumption should be such that we get maximum energy from least fuel. For this:
1. Under the given situation technology utilised should be the best possible. For example using smokeless chullahs should be preferred to traditional chullahs.
2. Energy should be extracted by most economic method under the given situation. Whereas energy extraction by solar cell may be useless in big towns due to cost factor, it may be indispensable for artificial satellites.
3. Wastage of energy should be strictly avoided. Energy saved is equal to energy produced.
4. Sources of energy should be such that it causes the least damage to environment.