Kerala Syllabus Class 5 Basic Science: Chapter 06 Sources of Energy - Questions and Answers | Teaching Manual 


Questions and Answers for Class 5 Basic Science (English Medium) ഊർജസ്രോതസുകൾ | Text Books Solution Basic Science (English Medium) Chapter 06 Sources of Energy. ഈ യൂണിറ്റിന്റെ Teachers Manual & Teachers Handbook എന്നിവയുടെ ലിങ്ക് ഈ പേജിന്റെ അവസാന ഭാഗത്തു നൽകിയിട്ടുണ്ട്.
Sources of Energy - Textual Questions and Answers & Model Questions

ഈ ബ്ലോഗ് അഡ്‌മിൻറെ രേഖാമൂലമുള്ള അനുമതിയില്ലാതെ ഈ ബ്ലോഗിൽ നൽകിയിരിക്കുന്ന ചോദ്യോത്തരങ്ങൾ, ഇതേരീതിയിലോ പി.ഡി.എഫ് രൂപത്തിലോ, മറ്റേതെങ്കിലും ഡിജിറ്റലോ, പ്രിന്റഡ് ഉൾപ്പെടെയുള്ള ഏതെങ്കിലും രൂപങ്ങളിലേക്കോ മാറ്റി മറ്റൊരു വെബ്സൈറ്റിലോ, ബ്ലോഗിലോ, യുട്യൂബ്, സോഷ്യൽ മീഡിയാ ഗ്രൂപ്പുകളിലോ ഉൾപ്പെടെ ഒരിടത്തും പ്രചരിപ്പിക്കാൻ പാടില്ലാത്തതാകുന്നു.

♦ What is energy?
• The ability to do work is called energy. 
• We cannot see energy. 
• It manifests through different actions. 
• Heat and light are forms of energy that we can experience.

♦ What are the situations in your house where energy is utilized? Write them down.
• For cooking
• For heating or cooling 
• For lighting
• For running appliances 
• For charging electronic devices

♦ What are the sources from which energy for cooking is obtained?
• Open hearth
• Kerosene stove
• Gas stove
• Electric stove
• Biogas
• Solar energy
• Cowdung cake
• Saw dust stove

♦ Food items are cooked when they receive energy from heat. How is heat generated in each type of stove? 
• Open hearth - By burning firewood
• Kerosene stove - By burning Kerosene
• Gas stove - By burning LPG
• Electric stove - By Electricity
• Biogas stove - By burning biogas
• Solar cooker - By solar energy

♦ What are Fuels?
Fuels are substances that generate heat when burned. Many materials such as wood, kerosene, LPG, petrol, diesel and coal are fuels.

♦ Does the firewood always burn well in the hearth?
What is to be done to make the firewood burn well?
• Blowing air using a pipe.
• Ensure adequate air supply.
• Firewood should be cut into small pieces 
• Clean the stove every day. 
• Clean the chimney once a month
• There should be a provision for smoke to escape.

♦ What is the purpose of blowing air using a pipe? 
Oxygen is necessary for burning. For giving more oxygen air is blown through a pipe. 

♦ Is Air Necessary for Burning? Write an experiment note.

Aim: To prove air is necessary for burning.

Materials required: Candles, glass

Procedure: Take two candles of the same size. Light both the candles. Cover one of them with a glass. Observe both the candles.

Observation: The candle flame is put out when it is covered with a glass.

Inference: Air (Oxygen) is necessary for the burning of all substances. When the candle flame is covered with the glass the air present in it is completely exhausted. Hence the candle flame is put out.

♦ Is it possible to utilize all the heat energy generated in a hearth?
What can be done to reduce heat loss?
• The gap between the vessel and the hearth should be minimized.
• Provision should be made to utilize wasted energy.
• Must have good air circulation.
• Do not fill with firewood.
• Firewood should be used in small pieces.
• Close the vessel with a lid
• The heat produced should reach the vessel fully. This helps to make cooking easier and save fuel.

♦ What are the uses of fuels?
• For cooking - firewood, kerosine, LPG, Biogas
• To run vehicles - Diesel is generally used as a fuel in heavy vehicles like buses, trucks and excavators. Petrol, diesel and gas are used in light vehicles like cars and auto-rickshaws. Jet fuel is used in aircraft.
• To operate different machines - Factories utilize coal, gas and naphtha. 
• For Electricity Generation - Coal, natural gas, and oil are used in power plants to generate electricity.
• In agriculture - Fuels power agricultural machinery and equipment, such as tractors and harvesters.

♦ How Petrol and diesel is obtained?
They are obtained from the crude oil extracted from the earth. Coal, crude oil and natural gas are made from the organic matter trapped underground millions of years ago. Fuels used in daily life such as petrol, diesel, kerosene and LPG used for cooking are all refined products obtained from crude oil.

♦ How crude oil is formed? 
Coal, crude oil and natural gas are made from the organic matter trapped underground millions of years ago.
♦ What are fossil fuels? 
Fossil fuels are formed from the remains of living organisms that existed on Earth millions of years ago. 

♦ What are non-renewable energy sources?
Fossil fuels are formed from the remains of living organisms that existed on Earth millions of years ago. Their stock decreases and eventually runs out by consumption. These are referred to as non-renewable energy sources.

♦ Complete the Flowchart
♦ Find out other fuels and group them based on their physical states.
• Solid - Firewood, Coal, Cowdung cake, Sawdust 
• Liquid - Petrol, Diesel, Kerosene, Jet fuel, Naphtha, Ethanol, Biodiesel
• Gas - Natural gas, LPG, CNG, Biogas, Hydrogen, Coal gas, Water gas, Methane

♦ How is Hydroelectric power generated?
Hydroelectric power is generated using the energy present in the water stored in dams. The water is released downwards as per demand to turn the turbines and drive the generator to generate electricity.

♦ Write an experiment note.
construct a model of a turbine (water wheel) and conduct an experiment 

♦ How can we generate electricity from wind?
Wind has the ability to move objects. We can generate electricity, utilising this ability of the wind.  When the blades of a windmill rotate, they drive a connected turbine and a generator and electricity is generated.

♦ In which places is wind power generated in Kerala?
In Keralam, electricity is generated from wind energy in places like Ramakkalmedu, Kanjikode and Attappadi.

♦ Why are windmills installed in places like Ramakkalmedu, Kanjikode and Attappadi.?
These areas experience strong and consistent winds, essential for efficient wind energy generation. The hilly terrain and open landscapes in these regions also contribute to the ideal conditions for wind farms.

♦ In what ways are the energy from sunlight utilized?
• For drying objects
• For drying clothes
• For drying firewood
• For drying grains
• For drying Herbs
• For drying Fish and Meat
• For drying Clay and Pottery

♦ Name the devices that use heat from solar energy?
• Solar stove/cooker
• Solar water heater
• Solar calculator
• Solar street light
• Solar emergency lamp

♦ What are the devices in the pictures given below?
• Solar calculator
• Solar street light
• Solar emergency lamp

♦ From where do solar devices get the energy to function?
• The solar panels in these devices convert sunlight into electricity. 
• When sunlight falls on the solar cells in the solar panel, electricity is generated.

♦ Have you noticed vehicles with green number plates? What are their special features?
• Less pollution. 
• lower running cost
• Less maintenance cost.
• Less noise pollution
• Can be charged using solar energy.

♦ Observe the types of electric vehicles present in your area and write them in your Science Diary.
• Electric Car
• Electric Bus
• Electric Train
• Electric Scooter
• Electric Autorickshaw

♦ What are Renewable Energy Sources?
Energy sources like sunlight and wind do not get exhausted due to consumption. These are known as renewable energy sources. These energy sources do not cause air pollution.

♦ Give examples of Renewable Energy Sources?
• Wind energy
• Solar energy
• Tidal wave 

♦ Which is the world’s first fully solar-powered airport?
Cochin Airport 

♦ Biogas
We can generate fuel from biowaste which causes environmental problems. Biogas is a type of fuel derived from biowaste. 

♦ What are the benefits of setting up biogas plants in our school and home?
• Waste disposal. 
• Energy production.
• Availability of manure
• Pollution can be reduced.

♦ Name the methods used for energy production:
• Hydroelectricity
• Electricity from the wind
• Thermal power plants using diesel and coal.
• Electricity generation from tidal energy.
• Geothermal energy.
• Nuclear energy.

♦ Hot Box
• Hotbox is a very simple device to keep the food from losing its heat. 
• If we keep the half-cooked food items in this box they get cooked. 
• It saves energy by preserving the heat inside it.

♦ What devices are used in houses to prevent energy loss? Identify and write down.
• Hot box
• Thermos flask
• Rice cooker
• Casserole

♦ What are the limitations of fossil fuels?
• Get exhausted with use
• Cannot be replenished
• Environmental pollution

♦ Collect information about Fuels like hydrogen and bio-diesel.
● Hydrogen fuel
Hydrogen fuel is a clean and efficient energy source.
It produces only water as a byproduct when used in fuel cells. 
There is no pollution
Hydrogen is readily available

● Biodiesel
Biodiesel is a renewable and biodegradable fuel produced from organic matter such as plants, algae or agricultural waste.

Let's assess
 
1. Categorise the following items into appropriate groups. Give the reason for categorising them.
Petrol, Coal, Solar energy, Electricity from wind, Hydroelectric power, Diesel
Renewable energy sources Non-renewable energy sources
• Solar energy
• Electricity from wind
• Hydroelectric power		• Petrol
• Coal
• Diesel
Renewable energy sources are those resources which do not exhaust even after repeated use.
Some energy sources get exhausted due to their uncontrolled use by human beings. Such energy sources are called non-renewable energy sources.

2. Complete the concept map by adding the products obtained when crude oil is processed.
3.  People still use open hearths, don’t they?
 What can be done to improve the efficiency of this?
• Ensure adequate air supply.
• Firewood should be cut into small pieces 
• Clean the stove every day. 
• There should be a provision for smoke to escape.
• A vessel of suitable size can be used for cooking
• Do not pack the stove with excess firewood. 
• Firewood should be utilised completely.
• Clean the chimney once a month.


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