Class 10 Science Chapter 14 Source of Energy

Class 10 Science Chapter 14 Source of Energy The answer to each chapter is provided in the list so that you can easily browse throughout different chapters NCERT Class 10 Science Chapter 14 Source of Energy and select need one.

Class 10 Science Chapter 14 Source of Energy

Also, you can read the SCERT book online in these sections Solutions by Expert Teachers as per SCERT (CBSE) Book guidelines. These solutions are part of SCERT All Subject Solutions. Here we have given Assam Board Class 10 Science Chapter 14 Source of Energy Solutions for All Subjects, You can practice these here…

Additional Questions and Answers

Q.1. What are two types of of energy?

Ans :- The two types of energy are :

( i ) Renewable.

( ii ) Non-renewable. 

Q.2. Which process converts solar energy to chemical energy? 

Ans :- Photosynthesis. 

Q.3. Name the components of solar energy not visible to us. 

Ans :- Ultraviolet and infrared rays. 

Q.4. What is full form of L.P.G.?

Ans :- Liquified Petroleum Gas. 

Q.5. Write the full name of C.N.G. 

Ans :- Compressed Natural Gas.

Q.6. Write the name of two fossil fuel. 

Ans :- Coal and petroleum. 

Q.7. What is the alternative name for renewable sources of energy? 

Ans :- Non-conventional sources. 

Q.8. Mention any two fuels that form the renewable sources of energy. 

Ans :- Wood and biogas. 

Q.9. In a hydroelectric power plant, what kind of energy is converted into electrical energy? 

Ans :- Potential energy into electrical energy. 

Q.10. Mention any two uses of wind energy. 

Ans :- ( a ) To construct windmills.

          ( b ) To sail boats. 

Q.11. Name the device which directly converts solar into electrical energy. 

Ans :- Solar cells. 

Q.12. What are the disadvantages of gaseous fuels? 

Ans :- ( i ) Gaseous fuel are highly inflammable. They can catch fire very readily. Therefore special care to be taken while storing and transporting them. 

( ii ) Gaseous fuel occupy more volume as compared to solid and liquid fuels. Therefore, big containers and large space is needed for their storage. 

Q.13. Why L.P.G. is called a good fuel? 

Ans :- L.P.G. is considered as a good fuel because of the following reasons :- 

( i ) L.P.G. has a high calorific value. Therefore it has higher efficiency as a fuel. 

( ii ) It burns with a smokeless flame and so does not cause pollution. 

( iii ) It does not produce any poisonous gases on burning. 

( iv ) It undergoes complete combustion. 

Q.14. Write two advantages of classifying energy sources as renewable and non-renewable. 

Ans :- ( i ) Which energy source should be used judiciously, that it could be used for maximum length of time e.g. non-renewable sources. 

( ii ) To develop newer methods to use a particular source economically, e.g. – renewable sources. 

Q.15. What is a fuel? 

Ans :- Any substance which may be burnt in air to produce heat and light in known as a fuel. For example – wood, coal, kerosene etc. 

Q.16. What is biomass? 

Ans :- The material obtained from plants and animals used as fuels is called biomass. 

Q.17. Give the raw materials used for the preparation of bio- gas.

Ans :- The following materials may be used to produce biogas :

( i ) Plant waste like husk, grass, dry leaves, weeds, vegetable htlf-strains. 

( ii ) Animal wastes like cow-dung, dungs of horse, elephant, poultry wastes. 

( iii ) Industrial and domestic wastes.

( iv ) Human excreta and faecal matter. 

Q.18. Write uses of the dams on rivers. 

Ans :- ( i ) Potential energy of the stored water is first converted to kinetic energy of the falling water which is finally converted to electric energy. 

( ii ) Water is stored in the dams during rains and used for irrigation purposes during draught. 

Q.19. Mention three advantages of solar cell. 

Ans :- ( i ) Solar cells can be used in remote areas. 

( ii ) Solar cells are easy to use and require least maintenance. 

( iii ) Solar cells have no moving parts and don’t require much technical knowledge to use it. 

Q.20. State two major advantages of preparing biogas from sewage. 

Ans :- ( i ) It helps control water pollution by removing undesirable sewage disposal. 

( ii ) It provides useful manure for agriculture. 

Q.21. What is the main constituent of biogas? 

Ans :- Methane. 

Q.22. What are the constituents of L.P.G.?

Ans :- Butane, propane and ethane. 

Q.23. Name the process by which large scale energy is produced in the sun. 

Ans :- By nuclear fusion. 

Q.24. Describe tidal energy. 

Ans :- Due to the gravitational pull of mainly the moon on the spinning earth, the level of water in the sea rises and falls. This phenomenon is called high and low tides and the difference in sea-levels gives us tidal energy. Tidal energy is harnessed by constructing a dam across a narrow opening to the sea. A turbine fixed at the opening of the dam converts tidal energy to electricity. 

Q.25. Biogas contains 70% methane. The calorific value of methane is 55 KJ/g. If a family requires 10,000 KJ of energy per day, how much biogas will be needed per day? 

Ans :- 55 KJ of energy is produced by 1 g of methane. 

10,000 KJ of energy is produced by 

                              =  10’000 / 55

                              = 181.8 g methane .

Since, biogas contains 70% methane 

Amount of biogas required per day 

                             =  181.8×100 / 70

                             =  259.74 g

Multiple Choice Questions

Q.1. Which one of the following is not a source of energy? 

( a ) Levers.

( b ) Muscle power.

( c ) Water stored at dams.

( d ) Flowing water.

Ans :- ( a ) Levers.

Q.2. The process of burning fuel is called 

( a ) Respiration.

( b ) Oxidation.

( c ) Explosion.

( d ) Combustion.

Ans :- ( d ) Combustion.

Q.3. Which gas cannot used as a fuel? 

( a ) C.N.G. 

( b ) L.P.G. 

( c ) Oxygen.

( d ) Hydrogen.

Ans :- ( c ) Oxygen. 

Q.4. Infra-red rays are 

( a ) Harmful to skin.

( b ) Bright red in colour.

( c ) Having more energy than ultraviolet rays. 

( d ) Having less energy as compared to ultraviolet rays.

Ans :- ( d ) Having less energy as compared to ultraviolet rays.

Q.5. Natural gas is mostly

( a ) Oxygen.

( b ) Hydrogen.

( c ) Ammonia.

( d ) Methane.

Ans :- ( d ) Méthane. 

Q.6. Which of the following is an example of biomass energy source? 

( a ) Ocean energy.

( b ) Tidal energy.

( c ) Atomic energy.

( d ) Gobar energy.

Ans :- ( d ) Gobar energy. 

Q.7. The device which converts solar energy into electrical energy is 

( a ) Solar cooker.

( b ) Solar geyser.

( c ) Solar cell.

( d ) All the above.

Ans :- ( c ) solar cell. 

Q.8. In a nuclear reactor, liquid sodium metal is used as: 

( a ) Fuel.

( b ) Coolant.

( c ) Moderator.

( d ) None of these. 

Ans :- ( b ) Coolant.

Q.9. Unit of calorific value of a substance is 

( a ) Kcal.

( b ) Calorie. 

( c ) Jkg.

( d ) Jkg⁻¹ 

Ans :- ( d ) J Kg⁻¹

Q.10. Which of the following causes maximum pollution on burning? 

( a ) Gobar cakes.

( b ) Petrol.

( c ) C.N.G. 

( d ) L.P.G. 

Ans :- ( a ) Gobar cakes. 

Q.11. Which of the following is a nonrenewable source of energy? 

( a ) Wood.

( b ) Sun.

( c ) Fossil fuels.

( d ) Wind.

Ans :- ( c ) Fossil fuels.

Q.12. Fuel used in thermal power plants is 

( a ) Water.

( b ) Uranium.

( c ) Biomass.

( d ) Fossil fuel.

Ans :- ( d ) Fossil fuel.

Q.13. Which of the following is not a green house gas? 

( a ) CO₂

( b ) CH₄

( c ) SO₂

( d ) CO

Ans :- ( d ) CO.

Q.14. The energy is obtained by nuclear fusion process in 

( a ) The sun.

( b ) Nuclear reactor.

( c ) Atomic bomb.

( d ) Geosystem.

Ans :- ( a ) The sun. 

Q.15. Which is not a good source of energy?

( a ) It is easy to store. 

( b ) It gives tremendous amount of energy.

( c ) It burns easily.

( d ) It produces no pollution.

Ans :- ( b ) It gives tremendous amount of energy. 

Q.16. Which is the ultimate source of energy?

( a ) Water.

( b ) Sun.

( c ) Uranium.

( d ) Fossil fuels.

Ans :- ( b ) Sun. 

Q.17. Choose the correct statement :

( a ) Sun can be taken as an inexhaustible source of energy.  

( b ) There is infinite storage of fossil fuel inside the earth.

( c ) Hydro and wind energy plants are non polluting sources of energy. 

( d ) Waste from a nuclear power plant can be easily disposed off.

Ans :- ( a ) Sun can be taken as an inexhaustible source of energy. 

Q.18. Gobar gas is-

( a ) Foul smelling gas.

( b ) Sweet smelling gas.

( c ) Having high calorific value.

( d ) Useless.

Ans :- ( c ) Having high calorific value. 

Q.19. A turbine can not be rotated by 

( a ) Flowing water.

( b ) Heat of sun.

( c ) Steam.

( d ) Moving win.

Ans :- ( b ) Heat of sun. 

Q.20. Which of the following substances can be used to construct a solar cell? 

( a ) Silicon.

( b ) Arsenic.

( c ) Silver.

( d ) Platinumele.

Ans :- ( a ) Silicon.

Q.21. What are the limitation of using solar energy? 

Ans :- ( i ) Solar energy is not available during cloudy or rainy days. 

( ii ) Solar energy is not available during night.  

Q.22. What is see wave energy? How is it obtained? 

Ans :- Sea wave energy is energy of the waves produced in sea due to winds. 

Sea wave tidal energy is harnessed in three ways :- 

( i ) Wave surge or focussing devices :- To overcome the problem of low height of water the barries are constructed in such a manner that water is channelled and concentrated into small area. The technique raise The height of water waves greatly. The raised water is channelled into an elevated reservoir. Now water is made to pass through channels in which water turbines rotate to produce electricity. 

( ii ) Pitching or Floats devices rise of fall with rising and falling waves. They are connected to a shaft by some mechanical arrangement to produce electricity. 

( iii ) Oscillating column water are pneumatic devices using up and down motion to compress and decompress air. The rising and falling water devices air into or out of the top of cylindrical shaft powering an air driven turbine. 

Q.23. State whether the statements are true or false. 

( i ) Gobar gas emits foul smell. 

( ii ) Black surface are good absorber of heat. 

( iii ) Solar cells convert solar energy into electric energy. 

( iv ) Ozone layer prevents infrared rays from entering earth’s atmosphere. 

Ans :- ( i ) False.

          ( ii ) True.

          ( iii ) True.

          ( iv ) False. 

Q.24. What part of solar energy is harmful to us? 

Ans :- Ultraviolet rays. These cause skin cancer. 

Q.25. What is solar energy? 

Ans :- It is the energy got from sun.

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