Class 5 Basic Science: Chapter 05 Energy Sources - Questions and Answers  | Teaching Manual & Teachers Handbook


Study Notes for Class 5th Basic Science (English Medium) അദ്ധ്യായം 05 ഊർജ്ജത്തിന്റെ ഉറവകൾ | Text Books Solution Basic Science - Chapter 05 Energy Sources - Teaching Manual & Teachers Handbook | ഈ അധ്യായത്തിന്റെ Teaching Manual, Teachers Handbook എന്നിവ ഡൗൺലോഡ് ചെയ്യാനുള്ള ലിങ്ക് ചോദ്യോത്തരങ്ങളുടെ അവസാനം നൽകിയിട്ടുണ്ട്.

Chapter 05: Energy Sources - Questions and Answers, Teaching Manual & Teachers Handbook
1. How is heat produced in a firewood stove?
Answer: By the burning firewood

2. What are the substances burnt to produce heat in a kerosene stove and a gas stove?
Answer: Kerosine, Cooking gas

3. Kerosine stove
Answer: When kerosene is ignited heat is produced

4. Gas stove :
Answer: When cooking gas is ignited heat is produced.

5. What are fuels?
Answer: Fuels are substances which liberate heat on burning.
eg: firewood, kerosene, petrol, diesel, LPG, CNG, hydrogen etc.

6. What are the different types of fuels?
Answer:
i) Solid fuels - firewood, coal etc.
ii) Liquid fuels - kerosene, petrol, diesel etc.
iii) Gaseous fuels - LPG, CNG, hydrogen etc.

7. What are the uses of fuels?
Answer:
• Cooking food
• To run vehicles
• To operate different machines

8. The fuel used in aeroplanes is known as
Answer: Aviation fuel

9. Why are fuels said to be sources of energy?
Answer: Fuels produce energy by burning. Hence all fuels are sources of energy.

10. Where do you get the energy for doing various activities?
Answer: From the food
11. Why is air blown into the firewood stove?
Answer: Oxygen is necessary for burning. For giving more oxygen air is blown through a pipe. More air means more oxygen.

12. Let us do an experiment.
Place a lighted candle on the tabletop as shown in the picture. Cover the lighted candle with a glass tumbler.
• What happens to the candle flame?
• Why is the candle flame put out?
Record your findings in the science diary. Prepare a brief note on the experiment you have done.
Answer:
Aim: To prove that oxygen Is necessary for burning.
Materials required: Lighted candle, glass tumbler, table
Procedure: Place a lighted candle on a tabletop. Cover the lighted candle with a glass tumbler.
Observation: The candle flame is put out when it is covered with a glass tumbler.
Inference: Oxygen is necessary for the burning of all substances. When the candle flame is covered with the glass the oxygen present in it is completely exhausted. Hence the candle flame is put out.

13. What changes should be made to make a firewood stove better?
Answer: Do not pack the stove with excess firewood. Ensure adequate air
supply. Firewood should be cut into small pieces before being placed on the stove. Firewood should be utilised completely. Clean the stove every day. Clean the chimney once a month.

14. What are the difficulties experienced by a woman while cooking food on a firewood stove?
Answer: Since the firewood is wet, proper burning does not take place. There is no way to get the firewood dried as it rains. There is no chimney for the smoke to escape.

15. What are the characteristics of a good stove?
Answer: 
• A good stove produces maximum heat from the fuel used.
• Air passage should be smooth.
• The heat produced should reach the vessel fully. This helps to make cooking easier and save fuel.
• There should be a provision for smoke to escape.

16. What are the instances in which a large amount of fuel is used?
Answer:
• To run vehicles
• To operate thermal plants
• Operating electrical devices
• Industrial purposes

17. What will be the consequences in future, if the fuels are excessively
used?
Answer:
• If we use fuels like coal, petrol etc excessively it will get exhausted after a few years.
• Excessive use of fuels will lead to the pollution of our environment.

18. Are all the sources of energy we use inexhaustible?
Answer:
Exhaustible and inexhaustible sources
Exhaustible sources are those sources. of energy, which will deplete and exhaust after a few hundred years.
Examples-coal and petroleum
inexhaustible resources of energy are those sources, which will not exhaust in future. This is unlimited.
Examples-Air, water, sunlight.

19. What are the energy sources made use of the devices solar panels and
windmill?
Answer: Solar energy and wind energy are the energy sources.

20. Conventional energy sources
Conventional fuels
Fuels which cannot be replenished once they get exhausted are called conventional Fuels.
Petroleum is formed from decayed living organisms buried deep under the
earth for millions of years due to some natural phenomena. Coal is formed
from plant remains. These are called fossil fuels.
Petroleum is mainly used to produce petrol, diesel, kerosene, tar and LPG.
used in the manufacture of many products like pesticides, plastics and
medicines.

21. Non-conventional energy sources
These sources of energy are abundant in nature.
However much they are used, solar energy, wind and sea waves are energy
sources which are inexhaustible. These are called non-conventional energy
sources.

22. What are the advantages of making maximum use of non-conventional sources of energy for our needs?
Answer:
• Non-conventional energy sources are found everywhere in the world and cannot get depleted.
• They do not release pollutants into the atmosphere and provide a cleaner, healthier environment.

23. Solar cells and Solar panels
Answer: Solar cell is a device which converts solar energy into electrical energy. Solar panels contain rows of solar cells. These are rectangular panels made of silicon.

24. Advantages of Solar energy
Answer: The advantages of energy are that it is inexhaustible and that it does not cause pollution. Lamps, cookers, water heaters and calculators working with solar energy are widely used nowadays.

25. Wind Energy
Answer: Windmills produce energy from wind. The blades of the mill rotate by the power of the wind. This rotation leads to the working of the generator. Thus electricity is produced.

26. What are the ways to control the consumption of electricity?
Answer:
• Make a habit of turning off all the lights and electronic devices when not in use.
• Use LED lights
• Buy energy star rated appliances
• Make use of solar energy.

27. Why is it said that the sun is the source of all forms of energy?
Answer: Sunlight is the ultimate source of energy because it is the source of almost all energies on earth. Green plants capture solar energy and convert it into food through the process of photosynthesis. All living organisms depend on this process for their energy requirement either directly or indirectly.

28. An incubator is used for the artificial hatching of eggs. Which type of
the bulb is suitable for this?
Answer: Just a regular incandescent bulb. The light bulb wattage you would need depends On the size of your incubator.

29. Examine the instances given below and find out those which help in the
conservation of fuels. Give a reason and explain.
i. Babu uses a cycle to go to the shop though he owns a motorcycle.
Answer: Yes, conserves fuel. Because cycle doesn't need fuel to work.

ii. Rahim uses a motor car only when he travels with his family but
uses a bus for travel at other times.
Answer: Yes, here also fuel is conserved. Because he uses his car when he wants to travel With his family other times he uses bus. So there is no extra usage of fuel.

iii. At Sathi’s home, her parents and other members of the family use
the electric iron at different times.
Answer: Here electricity is wasted. If we iron all the clothes at the same time we can reduce the consumption of electricity.

iv. As Raju keeps all the windows open during the day, he gets enough
light and breeze. He doesn’t have to use a lamp or fan.
Answer: Here Raju conserves electricity by doesn't use a fan and light.

v. Aswathy operates the television set using the remote controller only
and never switches off the power.
Answer: Here Aswathi wastes electricity. We should switch off electrical devices when It is not in use.




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