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Solutions of Sources of Energy (Page No- 148) - Physics By Lakhmir Singh, Class 10 | Extra Documents, Videos & Tests for Class 10 PDF Download

Lakhmir Singh Physics Class 10 Solutions Page No:148

Question 1: What substance is obtained as a residue when wood is burned in a limited supply of air ?

Solution : Charcoal.

Question 2: Name one source of energy which is not derived from solar energy directly or indirectly.

Solution : Geothermal energy.

Question 3: What name is given to the heat energy obtained from hot rocks inside the earth ?

Solution : Geothermal energy.

Question 4: Name the agent which decomposes animal dung into biogas.

Solution : Anaerobic bacteria.

Question 5: Which component of biogas is used as a fuel ?

Solution : Methane.

Question 6: Name the constitutents of biogas.

Solution : Bio gas consists of methane, carbon dioxide, hydrogen and hydrogen sulphide.

Question 7: Which of the following is needed for the formation of biogas from cow-dung and which not ?
 Water, Oxygen

Solution : Needed:- water.
Not needed:- oxygen.

Question 8: Name the clean fuel which can be obtained from cow-dung.

Solution : Biogas.

Question 9: Apart from cattle dung, what other substances can be added to a biogas plant ?

Solution : Apart from cattle dung, human excreta, agriculture wastes, vegetable wastes, poultry droppings, paper scrap etc. can also be added to a biogas plant.

Question 10: Name any three forms of energy which could be harnessed from the sea.

Solution : Three forms of energy which could be harnessed from the sea are:
(i) Tidal energy
(ii) Wave energy
(iii) Ocean thermal energy.

Question 11: Write two forms in which solar energy manifests itself in sea.

Solution : (i) Sea-waves energy.
(ii) Ocean thermal energy.

Question 12: Write the full form of OTE.

Solution : OTE stands for Ocean Thermal Energy.

Question 13: What is the function of anaerobic micro-organisms such as anaerobic bacteria in a biogas plant ?

Solution : Anaerobic bacteria help in the degradation of cow-dung in the presence of water but in the absence of oxygen.

Question 14: State whether the following statement is true or false :
 Tidal energy is one of the forms in which solar energy manifests itself in oceans.

Solution : False

Question 15: Fill in the following blanks with suitable words :
 (a) Biomass is another form in which……… energy manifests itself.
 (b) Tidal waves build up and recede……….. a day.

Solution : (a) solar. (b) twice.

Question 16: (a) What is biomass ? Give three examples of biomass.
 (b) Name the biomass which is still widely used as a source of heat energy in many households of our country.

Solution : (a) The dead parts of plants and trees, and the waste material of animals are called biomass. It is the organic matter which is used as a fuel to produce energy. E.g., wood, agricultural wastes and cow dung.
(b) Wood.

Question 17: What are the two ways in which cow-dung can be used as a fuel ? Which of them is better and why ?

Solution : Two ways in which cow-dung can be used as a fuel are:
1. In the form of cow-dung cakes, which can be used directly as a fuel.
2. By preparing biogas from cow-dung.
Biogas is better than cow-dung cakes because it gives a cleaner than cow-dung cakes and after extracting biogas, the spent cow-dung can be used as a manure.

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FAQs on Solutions of Sources of Energy (Page No- 148) - Physics By Lakhmir Singh, Class 10 - Extra Documents, Videos & Tests for Class 10

1. What are the different sources of energy?
Ans. The different sources of energy include fossil fuels (such as coal, oil, and natural gas), nuclear energy, renewable energy sources (such as solar, wind, hydroelectric, and geothermal energy), and biomass.
2. How is energy generated from fossil fuels?
Ans. Fossil fuels are burned to generate energy. For example, coal is burned in power plants to produce steam, which then drives turbines connected to generators to generate electricity. Similarly, oil and natural gas can be burned in engines or turbines to produce mechanical or electrical energy.
3. What are the advantages of renewable energy sources?
Ans. Renewable energy sources have several advantages. They are sustainable, meaning they can be replenished naturally. They produce little to no greenhouse gas emissions, helping to mitigate climate change. They also reduce dependence on fossil fuels, which are finite and contribute to air pollution and environmental degradation.
4. How does nuclear energy work?
Ans. Nuclear energy is generated through a process called nuclear fission, where the nucleus of an atom is split into two smaller nuclei, releasing a large amount of energy. This energy is used to heat water, produce steam, and drive turbines connected to generators to generate electricity.
5. What are the environmental impacts of different energy sources?
Ans. Different energy sources have varying environmental impacts. Fossil fuels contribute to air pollution, greenhouse gas emissions, and climate change. Nuclear energy, although low in greenhouse gas emissions, poses risks of radioactive waste and accidents. Renewable energy sources have minimal environmental impacts, with solar and wind energy being the cleanest options. However, the production and disposal of renewable energy technologies can have some environmental consequences.
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