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
SourceS of energy
Question 1: 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 2: 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 3: 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 4: 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 5: 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 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 13: 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 14: 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 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.
Question 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
Question 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.
Question 4: 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 5: 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 6: 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 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?
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 8- 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 9: 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 10: 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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