Sources of Energy Notes Questions and Answers Class 5 Basic Science Chapter 6 Kerala Syllabus

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Sources of Energy Class 5 Questions and Answers Notes

Class 5 Basic Science Chapter 6 Question Answer Notes Pdf Sources of Energy

Basic Science Class 5 Chapter 6 Question Answer Kerala Syllabus

Let Us Assess

Question 1.
Categorise the following items into appropriate groups. Give the reason for categorising them.
Petrol, Coal, Solar energy, Electricity from wind, Hydroelectric power, Diesel
Answer:

Non-renewable energy	Renewable energy
Petrol	Solar energy
Coal	Electricity from wind
Diesel	Hydroelectric power

Question 2.
Complete the concept map by adding the products obtained when crude oil is processed.
Answer:

Question 3.
People still use open hearths, don’t they? What can be done to improve the efficiency of this?
Answer:

• Ensure Good Airflow: Allow enough air for better burning.
• Use Better Fuel: Choose fuels that burn hotter and cleaner.
• Insulate the Hearth: Keep heat in by adding insulating materials.
• Clean Regularly: Remove ash and soot to maintain airflow.

Extended Activities

Question 1.
Conduct a survey in five houses in your neighbourhood to find out what types of fuels are used for cooking and whether any methods are employed to reduce fuel consumption. Collect the information and present it in the class.
Answer:

House number	Name of the house owner	Fuel used for cooking					Methods used to reduce the consumption of fuel.
		Fire wood	LPG	Kerosene	Electricity	Biogas
171 A	Prince	✓	✓		✓		Energy-efficient stoves need less fuel to work
56 A	Santhi	✓	✓	✓	✓		Pressure Cookers cook food faster and use less fuel.

Question 2.
Prepare and present a skit focussing on the importance of reducing the use of non-renewable energy sources.
Answer:
Hint for Skit: Create a scene where a family discusses high energy bills and the pollution from using non-renewable energy. A young family member suggests simple changes, like switching to solar power, using energy-saving appliances, and carpooling. Through humour or storytelling, highlight how these small changes help save money, protect the planet, and set a good example for others.

Sources of Energy Notes Questions and Answers

Question 1.
What are the situations in your house where energy is utilized?
Answer:
For Cooking, Boiling water, Drying Clothes.

Question 2.
What are the sources from which energy for cooking is obtained?
Answer:
Electricity, Wood, Solar Energy, Natural gas, LPG
Observe the pictures below.

We use an open hearth, kerosene stoves, and gas stoves for cooking food. Food items are cooked when they receive energy from heat.

Question 3.
How is heat generated in the stoves shown in the picture?
Answer:
Fuels are substances that generate heat when burned.

Question 4.
Which material burns in each type of stove?
Answer:
Open hearth — Wood, Kerosene stove — Kerosene, Gas stove – LPG

Question 5.
Which are the other materials used to generate heat?
Answer:
Petrol, diesel, coal etc.
What Helps in Burning?
The firewood does not always burn well in the hearth.

Question 6.
What is to be done to make the firewood burn well?
Answer:

• Blowing air using a pipe.
• UseDryWood
• Split the Wood
• Air Flow (Leave space between the logs so air can get in and the fire burns better)

Question 7.
What is the purpose of blowing air using a pipe?
Answer:
Blowing air through a pipe helps make a tire bum better. It adds oxygen. which makes the flames stronger and helps the fire start faster.

Question 8.
What can be done to reduce heat loss?
Answer:

• The gap between the vessel and the hearth should he minimised.
• Bum Dry Wood: Dry wood bums better and produces more heat.

Other Uses of Fuels
Diesel is generally used as a fuel in heavy vehicles like buses, trucks and excavators. However, petrol, diesel and gas are used in light vehicles like cars and auto-rickshaws. Factories utilise coal, gas and naphtha. Jet fuel is used in aircraft.

Question 9.
What are the other uses of fuels? Discuss.
Answer:

• Fuels like coal, natural gas, and oil are used to generate electricity in power plants.
• Fuels are used for ships and trains to transport goods and people.
• In agriculture, fuels are used to power tractors, harvesters, pumps for irrigation, and vehicles for transporting crops.

What is the Source?
Question 10.
Investigate and find out how petrol and diesel reach the petrol pumps.
Answer:
Petrol and diesel start as crude oil, which is refined into fuel at factories. Then, the fuel is sent to large storage areas. From there, tanker trucks deliver it to petrol stations. At the stations, the fuel is stored in underground tanks and pumped into vehicles when people till up. They are obtained from the crude oil extracted from the earth.

Question 11.
Do you know how crude oil is formed?
Answer:
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. Coal was used as fuel for running trains and ships and for operating industries before diesel and electricity became popular. Nowadays, coal is primarily’ used in thermal power plants.

Question 12.
Complete the Flowchart.

Answer:

Question 13.
In addition to the above mentioned, find out other fuels and group them based on their physical states.

Answer:

Observe the pictures given below. Look at the changes in fuel usage in trains over time.

Electricity is an alternative form of energy that can be used instead of fuels.

Question 14.
What are the various needs in houses that require electricity?
Answer:
In houses, we need electricity for things like lights, fans, cooking appliances, and charging devices.

Question 15.
How is electricity generated?
Answer:
Electricity is generated by using energy from sources like flowing water, wind, sunlight, and fuels.
These sources make machines called generators work, which produce electricity.

Question 16.
We can construct a model of a turbine (water wheel) and conduct an experiment, as shown in the picture.
Write down notes on the construction of the model in your Science Diary.

What should be included in the construction note?

• Name of the equipment
• Objective of the construction
• Materials required
• Diagram
• Steps of the construction

Answer:

• Name: Water Wheel Model.
• Objective: To see how water can turn a wheel, like a turbine.
• Materials: Plates, sticks, water, tape, scissors.
• Diagram: Draw the water wheel.

Steps:

• Cut flaps on the plate edges.
• Attach the plate to a stick (axle).
• Place so it spins and pour water on it to make it turn.

Question 17.
How does the turbine rotate? Does the variation in the force of the falling water influence the speed of the turbine?
Answer:
The turbine rotates when water falls on its blades, pushing it to spin. Yes, if the force of the falling water is stronger, the turbine spins faster.

Question 18.
Will the change in the height of the bottle affect the speed of the turbine?
Question
Yes, if the bottle is higher, the waterfalls with more force, making the turbine spin faster.
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.

Question 19.
Create a fan using palm leaves or paper. Stand outside holding this fan. Does the fan rotate? When does the fan rotate better?

Answer:
Yes, the fan rotates when there is wind, spins better when the wind is stronger.
The wind has the ability to move objects. We can generate electricity, utilising the ability of the wind. When the blades of a windmill rotate, they drive a connected turbine and a generator and electricity is generated.
In Keralam, electricity is generated from wind energy in places like Ramakkalmedu, Kanjikode and Attappadi.

Question 20.
Why are windmills installed in those places? .
Answer:
Windmills are installed in places where there are strong and consistent winds. These locations allow the windmills to generate more electricity efficiently by capturing the wind energy effectively.
Wind is an energy source that humans have used since ancient times. The power of the wind was utilised for travelling in rivers and oceans. Storms cause damage and calamities as they are rich in energy. We can reduce the rate of calamities and losses if we take precautions according to them.

Question 21.
Keep a steel vessel in a place where sunlight is available. Touch the vessel after some time. What did you experience? What is the reason? What will happen if some water is poured into the vessel?
Answer:
When you touch the steel vessel after it has been in the sunlight for some time, you will feel that it is hot. This happens because the sunlight heats the steel, causing it to absorb and retain heat. If you pour some water into the vessel, the water will also get heated quickly because the hot vessel will transfer its heat to the water, making it warm or even hot.

Question 22.
In what ways are the energy from sunlight utilized?
Answer:

• For drying objects.
• To generate electricity using solar panels.
• To heat water in solar water heaters.

Devices that use heat from solar energy include solar cookers and solar water heaters.

Question 23.
What are the devices in the pictures given below?

Answer:
Solar calculator, Solar Street light, and Solar lantern.

Question 24.
From where do they get the energy to function?
Answer:
They get energy from sunlight 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. Devices that generate electricity from sunlight are widely used in homes and other establishments.

Question 25.
Have you noticed vehicles with green number plates? What are their special features?
Answer:
Yes, vehicles with green number plates are usually electric vehicles. They run on electricity instead of petrol or diesel, which helps reduce air pollution.

Question 26.
Observe the types of electric vehicles present in your area and write them in your Science Diary.
Answer:
Electric scooters, electric cars and electric auto-rickshaws.

Question 27.
What are the specific features of renewable energy sources, such as sunlight and wind?
Answer:

• They are natural and will not run out.
• They do not cause pollution.
• They are available for free and can be used again and again.

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.

Question 28.
What are the benefits of setting up biogas plants in our school and home?
Answer:

• Reduces Waste: Turns food scraps and organic waste into useful energy.
• Provides Energy: Creates gas that can be used for cooking or heating.
• Eco-Friendly: Helps reduce pollution by using waste to make clean energy.

Question 29.
Visit a biogas plant and understand how it is operated?
Answer:

• Waste Collection: Food scraps, plant matter, and other organic waste are collected.
• Digestion Tank: This tank breaks down the waste, producing biogas.
• Gas Storage: The gas is stored and is used for cooking or lighting.

Question 30.
You have learned about different methods of energy production, haven’t you? Can these sources satisfy all our energy needs?
Answer:
No, these sources can’t fully meet our needs because they aren’t always available.
The methods provided below are also used for energy production:

• Thermal power plants using diesel and coal.
• Electricity generation from tidal energy.
• Geothermal energy.
• Nuclear energy

Question 31.
Collect more information about these and prepare an essay.
Answer:

• Thermal Power Plants: Diesel and coal are burned to create heat, which generates electricity.
• Tidal Energy: The power of ocean tides is used to produce energy.
• Geothermal Energy: This uses heat from deep inside the Earth to generate electricity.
• Nuclear Energy: Energy is created from reactions in the atomic nuclei, making large amounts of power.

Question 32.
What other devices are used in houses to prevent energy loss? Identify and write down.
Answer:

• Pressure Cooker: Cooks food faster by trapping steam and heat.
• Thermos Flask: Keeps drinks hot or cold by insulating them.
• Solar Water Heater: Heats water using sunlight, reducing the need for electricity.
• LED Bulbs: Use less electricity and last longer than traditional bulbs.

Question 33.
You have understood the various uses of fossil fuels, haven’t you? What are their limitations?
Answer:

• Get exhausted with use
• Causes pollution
• Leads to climate change

Solar energy, wind and tidal waves are the energy sources without these limitations.

Question 34.
Is sunlight available everywhere at all times?
Answer:
No, sunlight is not available everywhere at all times. It depends on the time of day and weather conditions.

Question 35.
Is the speed of wind uniform?
Answer:
No, the speed of wind is not uniform; it can change depending on various factors like location and weather conditions.

Question 36.
What about the tidal waves?
Answer:
Tidal waves vary in strength and height.
We can’t generate electricity always at the same rate from these sources. Fuels like hydrogen and bio-diesel are examples for such promising fuels.

Question 37.
Collect more information about these fuels and prepare a report.
Answer:
Hydrogen and bio-diesel are two new types of fuel we can use. Hydrogen comes from water or natural gas and produces only water when burned, which is very clean. Bio-diesel is made from plants and animal fats and can help reduce pollution. Both fuels can help us use less fossil fuels However, there are challenges in making them cheaper and more available.

Basic Science Class 5 Chapter 6 Sources of Energy Question Answer Notes

Question 1.
The fuel used in aircraft ¡s known as
Answer:
Jet fuel.

Question 2.
How is heat produced in a firewood stove?
Answer:
Due to the burning of firewood.

Question 3.
What are substances burnt to produce heat in a kerosene stove and a gas stove?
Answer:
Kerosene is burnt in the Kerosene stove, and LPG is burnt in the gas stove to produce heat.

Question 4.
What changes should be made to make a firewood stove better? Discuss and write down.
Answer:

• Ensure adequate air supply.
• The gap between the oven and the vessel should not be too large.
• There should be arrangements for using energy that may otherwise be wasted.

Question 5.
…………. are substances, that liberate heat on burning.
Answer:
Fuels

Question 6.
The source of all our energy is the ………….
Answer:
Sun

Question 7.
The ….. in air helps for burning.
Answer:
Oxygen

Question 8.
Kerosene is a ….. product.
Answer:
Petroleum.

Question 9.
Fill in the blanks by choosing the correct relationship.
Aircraft: Jet Fuel
Rocket : ……………..
Answer:
Hydrogen.

Question 10.
What are fuels?
Answer:
Substances that liberate a lot of heat while burning are called fuels.

Question 11.
Do you know the availability of wood is decreasing in our state? What are the methods to be adopted for the better use of firewood?
Answer:
Yes.

• Don’t fill the hearth completely with wood.
• Burn wood to get fire only at the bottom of the vessel.
• Use wood as large pieces.

Question 12.
Smokeless hearth is good when compared to common hearth. Write your opinion.
Answer:
Smokeless hearth is better than the common hearth we use. Since the fuel gets sufficient oxygen for this burning, the smoke will be reduced no carbon is produced. All the carbon molecules in the fuel burn in this hearth. So, the heat capacity of a smokeless hearth is much greater. This controls environmental pollution and also reduces the quantity of firewood needed.

Question 13.
Write the names of the fuels used for running vehicles.
Answer:
Petrol, diesel, LPG, CNG

Question 14.
Which are the energy sources that we use for cooking food?
Answer:
Wood.. LPG, Kerosene, Electric heater, Gobar gas.

Question 15.
What are the peculiarities should a good stove have?
Answer:

• Provision of free movement of air.
• Provision for escape of smoke.
• Covered to the possible extent so that heat is retained inside.

Question 16.
Tabulate the given into solid fuels, liquid fuels and gaseous fuels.
Firewood, Diesel, Petrol, Charcoal, Coal, Cowdung cake, Saw dust, Kerosene, LPG, CNG,Hydrogen, Acetylene, Biogas, Aviation Fuel, Biodiesel.
Answer:

Solid fuels	Liquid fuels	Gaseous fuels
Firewood Charcoal Coal Cowdung cake Saw dust	Diesel Petrol Kerosene Aviation fuel Biodiesel	LPG CNG Hydrogen Acetylene

Question 17.
What will be the consequences in future for the excessive use of fuels?
Answer:

• Shortage of diesel and petrol for vehicles.
• Shortage of electricity in houses.
• Shortage of electricity in factories.

Question 3.
Examples of solar-powered devices?
Answer:

• Calculator
• Solar Street lamp
• Solar heater
• Solar cooker

Question 4.
How is electricity produced from wind?
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.

Question 5.
What steps can be taken to save energy at home?
Answer:

• Compact fluorescent lamps (CFL), which work in low energy, should be used.
• Do not misuse electricity.
• Use fuel-efficiency heaters for cooking.

Question 6.
The device which supplies the necessary electrical power to the artificial satellite is ………
Answer:
Solar panel

Question 7.
…………. is a mixture of gases formed during the decay of plant materials and animal excreta.
Answer:
Biogas

Question 8.
Coal is a …. fuel
Answer:
Fossil

Question 9.
Find the odd one.
LPG, CNG, Hydrogen, Kerosene
Answer:
Kerosene – Others are gaseous fuels

Question 10.
What are the main uses of petroleum?
Answer:
Petroleum is mainly used to produce petrol, diesel, kerosene, coal tar and LPG. In addition, it is used in the manufacture of many products like pesticides, plastics and medicines.

Question 11.
What is meant by renewable sources of energy? Give an example.
Answer:
The sources which are perennial and give energy continuously and which do not deplete with use are called renewable sources of energy. Eg: Biomass.

Question 12.
What are the merits of solar energy?
Answer:

• It is not harmful to the environment.
• It is a non-conventional source of energy.

Question 13.
Find the odd one?
Sunlight, wind, waves, petroleum refinery
Answer:
Petroleum refinery – others are non-conventional energy sources.

Question 14.
How does coal, petroleum and natural gas are produced?
Answer:
Coal was formed by various changes that took place in plants that lay buried under the earth’s surface for millions of years due to natural calamities. Petroleum and natural gas were formed from the dead remains of microorganisms present in the sea.

Sources of Energy Class 6 Notes

We all need energy to do our daily activities. Just like we get energy from the food we eat, machines get energy from fuels. In this lesson, we will learn about different types of fuels, how to use them wisely, and ways to save energy. We’ll also explore where energy comes from and why it’s important to use it carefully.

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

Non-Renewable Energg 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.

Hydroelectric power is generated using the energy present in the water stored in dams.

Electricity from the Wind
Wind has the ability to move objects. We can generate electricity, utilising this ability of the wind.

Energy from the Sunlight
When sunlight falls on the solar cells in the solar panel, electricity is generated.

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.

• The ability to do work is called energy. Heat and light are forms of energy that we can experience.
  Those that supply energy are the sources of energy.
• Fuels are substances that liberate heat on burning. Examples are wood, kerosene, LPG, petrol, diesel, coal, etc.
• The oxygen in the air helps in burning.
• Coal, crude oil and natural gas are made from organic matter trapped underground millions of years ago.
• Fossil fuels were formed from the remains of the plants and animals that lived millions of years ago and were buried deep in the interior of the earth. These are referred to as non-renewable energy sources.
• Firewood and coal are solid fuels. The components separated from petroleum, such as diesel, petrol and kerosene, are liquid fuels. LPG, CNG and hydrogen are gaseous fuels.
• Electricity is an alternative form of energy that can be used instead of fuels.
• Hydroelectric power is generated using the energy present in the water stored in dams where as electricity can also be generated utilising the ability of wind to move objects.
• The sun is our richest and the most sustainable source of energy. When sunlight falls on the solar cells in the solar panel, electricity is generated.
• Energy sources like sunlight and wind do not get exhausted due to consumption. These are known as renewable energy sources.
• Biogas is a type of fuel derived from biowaste.
• Hotbox is a very simple device to keep the food from losing its heat.