CBSE Class 10 Physics Sources of Energy Assignment

Read and download free pdf of CBSE Class 10 Physics Sources of Energy Assignment. Get printable school Assignments for Class 10 Physics. Standard 10 students should practise questions and answers given here for Physics in Grade 10 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 10 Physics prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Sources Of Energy Class 10 Physics Assignment Pdf

Class 10 Physics students should refer to the following printable assignment in Pdf for Sources Of Energy in standard 10. This test paper with questions and answers for Grade 10 Physics will be very useful for exams and help you to score good marks

Class 10 Physics Assignment for Sources Of Energy

 

Question. Which is the most popular kitchen fuel in India?
Answer : LPG

Question. Which method is used to produce electricity in hydroelectric power plant?
Answer : By running dynamo by kinetic energy

3. Which of the following is the odd one out?
a. Petroleum.
b. Hydro electricity.
c. Coal
d. CNG
Answer : B. Hydroelectricity.

Question. Which method is used to produce electricity in thermal power plant?
Answer : By boiling water.

Question. Which of the following is a component of bio-gas?
a. Methane
b. LPG
c. CNG
d. Hydrogen sulphide
Answer : Methane

Question. Which produces energy because of temperature difference at various levels in ocean.
Answer : ocean thermal energy

Question. Which energy source is the largest source used in India?
Answer : Sun

Question. Which of the following is normally used in solar cookers for trapping solar energy?
a. Solar panels
b. Siilicon cells
c. Mirrors
d. Any of above
Answer : Mirrors (for reflecting the sun rays)

Question. In which of the following kinetic energy is converted into electrical energy?
a. Tidal energy
b  hydro energy.
C. Wind energy
d. All of these
Answer : All of these

Question. Which of the following is the ultimate source of energy for us?
a. LPG.
b. Nuclear
c. Solar.
d. CNG
Answer : Solar

Short questions Answers

Question. What is a good source of energy?
Answer : The energy which is easily available, cheap, does not produce pollution is said to be good source.

Question. What is a good fuel?
Answer : A good fuel is one which is cheap, easily available, easy to handle, transport, has proper ignition temperature and high calorific value.

Question. What are the disadvantages of fossil fuels?
Answer : Disadvantages of fossil fuels are:
(a) They are non-renewable resources
(b) They cause pollution which can lead to
(i) Acid rain
(ii) Smoke
(iii) Green house effect due to CO2
(iv) Fly ash suspended in air.

Question. Why are we looking at alternate sources of energy?
Answer : The sources of energy we are using now is fossil fuel i.e., petrol and petroleum products, and coal which are exhaustible and non-renewable. The demand of energy is increasing due to increased population and better technology that has added many machines, appliances to add comfort to life style. Hence ,the. demand for energy is increasing day by day. To overcome this problem we are looking for alternate sources of energy.

Question. How has the traditional use of wind and water energy been modified for our convenience?
Answer : (i) The traditional use of water energy has been modified and we have built dams, turbines and dynamos to generate electricity with the help of flow of water.
(ii) Wind; energy is used to rotate the wind mills, turbines and generate electricity by constructing wind fAnswer :

Question. What kind of mirror-concave, convex or plain-would be best suited for use in a solar cooker? Why?
Answer : Concave minor would be best suited for use in solar cooker. As it is a converging mirror and would converge sun heat radiation at one focussed point.

Question. What are the limitations of the energy that can be obtained from the oceans?
Answer : The limitations of ocean energy are: (i) Few limited sites/places where this wave, tidal or ocean thermal energy can be obtained. (ii) The cost of construction of plants is very; high (iii) The efficiency of producing energy is also low

Question. What is geothermal energy?
Answer : The heat energy obtained in the form of steam from under the earth’s crust is called geothermal energy

Question.. What are the advantages of nuclear energy?
Answer : The advantages of nuclear energy are: (i) A very small amount of radioactive material can produce large amount of energy which can be controlled and converted into usable form e.g., 1 kg Uranium = 25 thousand tonnes of coal. (ii) It does not release any smoke or harmful gases in the air. Hence it can, curbthe global warming that is caused due to green house effect.

Question. Can any source of energy be pollution free? Why or why not?
Answer : Yes, there can be a source of energy that can be pollution free in using it. e.g., sun’s energy that is used in solar cooker, solar water heater, solar cell panels.

Question. Hydrogen has been used as a rocket fuel. Would you consider It a cleaner fuel than CNG? Why or why not?
Answer : Hydrogen is a cleaner fuel than CNG because hydrogen on burning/combustion form water whereas CNG that contain methane burns to produce carbon dioxide.

Question. Name two energy sources that you would consider to be renewable. Give reasons fur your choices.
Answer : Solar energy-it will not get exhausted it can be used for multipurpose-heating, burning and producing electricity. It will not cause any pollution, it is cheap and easily available. Energy from water-Energy can be obtained from water in various form i.e., for producing electricity without pollution.

One linear questions :-

Question. A solar water heater cannot be used to get hot water on………..,…
Answer : ) a cloudy day.

Question. Which of the following is not an example of a bio-mass energy source?
(a) wood
(b) gobar-gas
(c) nuclear energy
(d) coal
Answer : (c) nuclear energy.

Question. 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 ?
Answer : (c) nuclear energy.

Question. Compare and contrast fossil fuels and the Sun as direct sources of energy.
Answer : Sun        
1. It is renewable source of energy.
2. It does not cause pollution.
3. It is cheap, easily available for most of the time and at most of the places.

Fossil fuels 
1. It is non-renewable source of energy.
2. It causes pollution in the environment.
3. It is expensive, not easily available ai1y time and anywhere.
 

Question. Compare and contrast bio-mass and hydro electricity as sources of energy.
Answer :
Bio-mass as Energy Source
1. It causes pollution.
2. It is cheap and easily available.
3. Initial cost for building the bio-gas plant is very cheap and its maintenance is also cheap.

Hydro electricity as Energy Source
1. It does not cause pollution.
2. It is expensive and not easily available.
3. The initial cost of building the power plant is expensive, its maintenance is also expensive.

Question. What are the limitations of extracting energy from:
(a) the wind?
(b) waves?
(c) tides?
Answer : (a) The Wind
(i) It can be extracted only at limited sites where the wind blows most of the time in a year.
(ii) The minimum speed of wind should be 15 km/h.
(iii) Large area is required to build the wind farm/wind mills which is expensive affair.
(iv) Efficiency, is low.

(b) Waves (i) The place and time is limited when the waves are strong.
(ii) Initial setup cost is expensive.
(iii) Efficiency is low.

(c) Tides
(i) The areas where tidal energy can be harnessed is less.
(ii) The efficiency is very low.
(iii) The plants are not cost effective.

Question. On what basis would you classify energy sources as
(a) renewable and non-renewable?
(b) exhaustible and inexhaustible?
Answer : Both (a) and (b) options are same:
Renewable/Inexhaustible
1. They are also called inexhaustible
2. The energy source that will not finish and can be renewed or made again and again is called renewable source of energy e.g., sun, wind, water.

Non-renewable/Exhaustible
1. They are also called as exhaustible
2.The energy source that will finish and will get exhausted and cannot be made very soon or takes million of years for its formation e.g., fossil fuels-petrol, coal.

Question. What are the qualities of an ideal source of energy?
Answer : he ideal source should have the following qualities:
1. should be cheap, easily available and easy to handle.
2. It can be transported easily.
3. It should have high calorific value.
4. It should have proper ignition. temperature.
5. It should not cause any environmental pollution.

Question. What are the advantages and disadvantages of using a solar cooker.? Are there places where solar cookers would have limited utility?
Answer : Advantages of solar cooker:
(a) It is cheap and easy to handle.
(b) It does not need any fuel for cooking food.
(c) It is pollution free.

Disadvantages of solar cooker:
(a) It is very slow, takes long time for cooking.
(b) It is dependent on sun's light, cannot work on cloudy day.
(c) The reflectors position need to be monitored so as it reflects the sunlight at the centre focused point of the solar cooker. Yes-the places where sun’s energy not sufficient, the use of solar cookers would be limited

Question. What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?
Answer : Due to increasing demand of energy the available sources of energy are depleting at fast rate. The use of fuels on large scale is releasing lot of gases and unwanted particles in the air. The gases like SO2, NO2 are causing acid rain that is destroying monuments, iron articles, bridges etc. The CO2 released in air is causing green house effect that is leading to global warming which will melt the ice and sea-level will increase submerging coastal areas and islands. To reduce energy consumption we should look for alternative source of energy which can help us to overcome all these problems.

SourceS of energy
 
Question. What is a good source of energy?
Answer : A good source of energy should have the following qualities-
(1) It should be easily available.
(2) It should have high calorific value.
(3) It should be easy to store and transport.
(4) It should be economical.
(5) It should cause less environmental pollution.
 
Question. What is a good fuel?
Answer : A good fuel should have the following qualities-
(1) It should be easily available.
(2) It should have high calorific value.
(3) It should be easy to store and transport.
(4) It should be economical.
(5) It should cause less environmental pollution.
 
Question. If you could use any source of energy for heating your food, which one would you use and why?
Answer : We shall use LPG/CNG gas or electricity for heating our food because these are have all properties of good fuel.
 
Question. What are the disadvantages of fossil fuels?
Answer : There are following disadvantages of fossil fuels like coal and petroleum-
(1) Burning of coal or petroleum causes air pollution.
(2) Burning of fossil fuels produce gasses responsible for acidic rain and green house effect.
(3) Fossil fuels are non-renewable sources of energy.
 
Question. Why are we looking at alternate sources of energy?
Answer : Because traditional sources of energy like coal, petroleum are non renewable sources, have limited sources on earth. Also these cause pollution. So we are looking at alternate sources.
 
Question. How has the traditional use of wind and water energy been modified for our convenience?
Answer : (1) Wind energy is converted into electricity by wind mills.
(2) Energy of moving water is also converted into electricity by the use of dams and generators.
 
Question. What kind of mirror – concave, convex or plain – would be best suited for use in a solar cooker? Why?
Answer : Concave mirrors are used in soalr cooker. Because concave mirrors converge the light incident on them at a single point to produce a large amount of heat.
 
Question. What are the limitations of the energy that can be obtained from the oceans?
Answer :
(1) Limitations Tidal energy-There are very few locations where dams to utilize tidal energy can be built and these cannot work all the time.
(2) Limitations of wave energy- There are limited locations with high strength waves.
(3) Limitations of Ocean thermal energy- To get electricity from ocean thermal energy OTEC plants are made.
This plant is very costly and can work only when there is temperature difference of minimum 20°C between sea level and some depth.
 
Question. What is geothermal energy?
Answer : Geothermal energy is the heat energy present inside earth in certain regions called hot spots. When underground water comes in contact with the hot spot, steam is generated. This steam is routed through a pipe to a turbine and used to generate electricity.
 
Question. What are the advantages of nuclear energy?
Answer : Electricity can be produced by nuclear fission reaction in nuclear reactor. Calorific value of nuclear sources are very high. Atomic bomb is also based on nuclear fission reaction. Sun and other stars produce a huge amount of energy by nuclear fusion reaction.
 
Question. Can any source of energy be pollution-free? Why or why not?
Answer : No, any source of energy cannot be pollution free. Solar cell like pollution free sources also produce
pollution while production or destruction.
 
Question. Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not?
Answer : Hydrogen is cleaner fuel than CNG because on burning hydrogen produce only water, but CNG produce green house gasses. Beside this hydrogen’s calorific value is very high.
 
Question. Name two energy sources that you would consider to be renewable. Give reasons for your choices.
Answer : Solar, water and wind energy are renewable sources because these cannot be exhausted. Bio-mass and wood are also renewable sources of energy as these can be replenished again in some time.
 
Question. Give the names of two energy sources that you would consider to be exhaustible. Give reasons for your choices.
Answer : Coal and petroleum are two exhaustible sources of energy. These fuels were formed over millions of years ago and there are only limited reserves. If we continue to use them as at present, these reserves will be exhausted very soon.
 
EXERCISE QUESTION-ANSWERS
 
Question. 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.
 
Question. Which of the following is not an example of a bio-mass energy source?
(a) wood
(b) gobar-gas
(c) nuclear energy
(d) coal
 
Question. 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.
 
Question. Compare and contrast fossil fuels and the Sun as direct sources of energy.
Answer-
                                      Fossil fuels                                                  Sun
1. These are non-renewable sources of energy.               1. This is a renewable source of energy.
2. These cause pollution.                                                 2. It do not cause pollution.
3. These will exhaust in near future.                               3. It will last as the solar system exist.
4. Energy can be produced any time.                             4. Energy can only be utilized at day time in sunshine.
 
Question. Compare and contrast bio-mass and hydroelectricity as sources of energy.
Answer- 
                          Bio-mass                                      Hydroelectricity
1. This is a renewable source of energy.                1. This is a renewable source of energy.
2. It causes pollution.                                             2. It do not cause pollution.
3. Energy can be produced anytime, anywhere.     3. There are limited places where hydroelectric
                                                                               power plants can be developed.
Question. What are the limitations of extracting energy from — (a) the wind? (b) waves? (c) tides?
Answer- (a) Limitations of wind energy-
(1) Initial cost of wind mill plant is very high.
(2) For proper working of will mills, speed of wind must be more than 15 km/h, but this is not possible for the whole year.
(3) There are limited places where wind mill plant can set up.
(4) A large area is required to set up a wind mill plant.
 
(b) Limitations of wave energy- There are limited locations with high strength waves. 
 
(c) Limitations tidal energy-There are very few locations where dams to utilize tidal energy can be built and these cannot work all the time.
 
Question. 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?
Answer- (a) The source of energy that replenishes in nature is known as renewable source of energy. Sun, wind,moving water, bio-mass, etc. are some of the examples of renewable sources of energy.
The source of energy that does not replenish in nature is known as non-renewable source of energy. Coal, petroleum, natural gas, etc. are some of the examples of non - renewable sources of energy.
(b) Exhaustible sources are those sources of energy, which will deplete and exhaust after a few hundred years.Coal, petroleum, etc. are the exhaustible sources of energy.
Inexhaustible resources of energy are those sources, which will not exhaust in future. These are unlimited.Bio-mass is one of the inexhaustible sources of energy.
Yes. The options given in (a) and (b) are the same.
 
Question.  What are the qualities of an ideal source of energy?
Answer- An ideal source of energy should have the following qualities-
(1) It should be easily available.
(2) It should have high calorific value.
(3) It should be easy to store and transport.
(4) It should be economical.
(5) It should cause less environmental pollution.
 
Question. What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?
Answer- Advantages of using solar cooker-
(1) This is pollution free.
(2) Free Sun energy is utilized.
(3) It do not destroy nutrients of food.
Disadvantages-
(1) It cannot work at night or during clouds.
(2) Reflector of solar cooker must be directed towards Sun from time to time.
(3) High temperature cannot be attained.
(4) It takes a lot of time to hot the food.
 
Question. What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?
Answer- Environmental consequences of the increasing demand for energy-
(1) Gasses evolved during burning of fossil fuels increase green house effect.
(2) Gasses evolved during burning of fossil fuels are responsible for acidic rain.
(3) Gasses evolved during burning of fossil fuels cause air pollution.
(4) High energy demand result in deforestation, which cause less rain, soil erosion etc.
(5) Wastages of nuclear reactor are very dangerous.
 
Steps to reduce energy consumption-
(1) Lights and fans should be turned ‘ON’ only when needed.
(2) We should use energy efficient appliances.
(3) We should use bio-gas plant in rural area.
(4) We should use fuels which cause less pollution.
(5) We should use pressure cooker for cooking.
(6) We should use public transport instead of private vehicles.
(7) We should use cycle instead of bike

 

More Question-

1. What is a fuel ?

2. Name the gaseous fuel which has the highest calorific value ?

3.Name the major sources of energy that largely fulfils the growing demand of energy in our country?

4. State the ultimate source of energy of fossil fuels ?

5. The use of dry wood as domestic fuel is not considered as good . State two reasons for it .

6. What are the two disadvantages of burning fossil fuels ?

7. Name any two renewable sources of energy .

8. Name two sources of energy which are pollution free .

9. Name the reaction responsible for large energy production in the sun .

10. In solar cooker ,why is its inner surface blackened ?

11.Why is the solar cooker box covered with a plane glass plate ?

12.What type of reflector is used in box type solar cooker ?

13. Mention the main purpose of using a plane mirrors in solar cookers .

14.Name the device that directly converts solar energy to electric energy .

15. Which material is best suited for making solar cells ?

16. Name Chief Cmponents of solar cells .

17 Which energy conversion takes place in a solar cells ?

18 List 2 main advantages associated with a solar cells .
 
19 What is a solar panel ?
 
20 What is a wind energy ?
 
21 What is a chief sorce of wind energy ?
 
22 What is the minimum wind velocity required for obtaining electric power with a windmill generator ?
 
23 How has the traditional use of wind energy been modified for our convenience ?
 
24 Construction of dams submerges large areas of forest. How does this contribute to the greenhouse effect
 
25 How does construction of dams across the river get linked with the production of green houses gases
 
26 List any one harm caused to environment by hydropower plant ?
 
27 What type of energy is possessed by huge waves near the sea shore ?
 
28 Write two different ways of harneesing energy from ocean.
 
29 What is bio-mass ?
 
30 Give the composition of the slurry fed into the digester of a gobar gas plant .
 
31 What is bio-gas?
 
32 Which one of the following gases is the major constituent of bio-gas ? Carbon monoxide, hydrogen, methane, carbon dioxide.
 
33 What is the use of the slurry left behind in the digester of the bio-gas plant ? give reasons.
 
34 List two nutrients that the slurry left behind in a bio-gas plant contains.
 
35 How does bio-gas plant help to reduce the problem of pollution ?
 
36 Define the term “nuclear fission”.
 
37 Write one advantage of nuclear fission reaction.
 
38 Suggest any two reasons which make the large scale usage of nuclear energy prohibitive.
 
39 Write the full form of CNG.
 
40 Name the volatile liquid boiled with the warm surface water of oceans for running oceans thermal energy plants
 
41 Write the name of the substance whose vapors are used to run the turbine of the generator of ocean thermal energy plants.

 

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