The DAV Class 5 Science Solutions and DAV Class 5 Science Chapter 9 Question Answer – Fuels are essential study tools for DAV public school students in Class 5.
DAV Class 5 Science Chapter 9 Question Answer – Fuels
DAV Class 5 Science Ch 9 Question Answer – Fuels
Something To Know
A. Fill in the blanks.
Question 1.
______ acts as fuel for our body.
Answer:
food
Question 2.
Cowdung cake has been often used as ______ a fuel.
Answer:
kitchen
Question 3.
Aeroplanes use highly refined ______ as fuel.
Answer:
petrol
Question 4.
______ is a better green fuel.
Answer:
CNG
Question 5.
Petrol and ______ are fossil fuels used for transportation.
Answer:
coal
Question 6.
Solar energy is a ______ source of energy.
Answer:
renewable
B. Write True or False for the following statements.
1. LPG is used as a domestic fuel.
2. Some train engines run on diesel.
3. Powerhouses bum CNG to generate electricity.
4. Coal is a renewable source of energy.
5. We should use public transport to help reduce environmental pollution.
Answer:
1. LPG is used as a domestic fuel. (True)
2. Some train engines run on diesel. (True)
3. Powerhouses bum CNG to generate electricity. (False)
4. Coal is a renewable source of energy. (False)
5. We should use public transport to help reduce environmental pollution. (True)
C. Tick ( ✓) the correct option.
1. Out of the following, the fuel, that is best for reducing environmental pollution is
(a) diesel
(b) coal
(c) compressed natural gas
(d) cowdung cakes
Answer:
(c) compressed natural gas
2. A good fuel is one that
(a) does not bum easily
(b) is costly and not easily available
(c) does not produce smoke or leave ash
(d) is not easy to store
Answer:
(c) does not produce smoke or leave ash
3. A fuel, that is not obtained by refining petroleum, is
(a) petrol
(b) diesel
(c) kerosene
(d) biogas
Answer:
(d) biogas
4. Out of the following, the energy source, that is a renewable energy source, is
(a) petrol
(b) wind
(c) diesel
(d) coal
Answer:
(b) wind
5. Coal, a common fossil fuel, is formed
(a) from the waste of animals
(b) from dead sea-creatures
(c) by decay of water plants
(d) by decay of vegetation, under heat and high pressure, over a long period of time
Answer:
(d) by decay of vegetation, under heat and high pressure, over a long period of time
D. Answer the following questions in brief.
Question 1.
State the main function of a fuel.
Answer:
Production of energy
Question 2.
Give one example each of solid, liquid and gaseous fuels.
Answer:
Coal (solid), petrol (liquid) and CNG (gaseous)
Question 3.
Why is biogas regarded as a better fuel than cowdung cakes.
Answer:
Cowdung cakes produce lot of somke and ash, while biogas does not produce smoke or ash. Thus, biogas is much cleaner than cowdung cakes. Hence, biogas is regarded as a better fuel than cowdung cakes.
Question 4.
Why is CNG called a better green fuel?
Answer:
CNG does not produce smoke or ash oh burning. So, it is environment- friendly and is called a better green fuel.
Question 5.
Name the three main fossil fuels.
Answer:
Coal, Petroleum and Natural Gas
Question 6.
State two disadvantages of fossil fuels.
Answer:
Two disadvantages of fossil fuels:
(a) They cannot be renewed
(b) They create environmental pollution
E. Answer the following Questions.
Question 1.
How have fossil fuels been formed?
Answer:
Millions of years ago, animals and plants got buried under the surface of earth. Under heat and high pressure, over a long period of time, they got changed into coal and petroleum.
Question 2.
When is a source of energy said to be a renewable source of energy? Give two examples of such sources.
Answer:
Energy sources which can be readily replenished after use are called renewable sources of energy. Examples: solar energy and tidal energy.
Question 3.
When is a source of energy said to be a non-renewable source of energy? Give two examples of such sources.
Answer:
Energy sources which cannot be readily replenished after use are called non-renewable sources of energy. Coal and petroleum are non-renewable sources of energy.
Question 4.
How is coal used by powerhouses for generating electricity?
Answer:
In powerhouses, coal is burnt to convert water into steam. The steam is used to run turbines which generate electricity.
Question 5.
Why should efforts need to be made to reduce the use of fossil fuels?
Answer:
Fossil fuel is available in limited quantity. It is going to be finished in the near future. Fossil fuels also cause environmental pollution when they are burnt. So, we need to find some alternatives to reduce environmental pollution and to reduce our dependency on fossil fuels.
Value Based Questions
Question 1.
State the values, and qualities displayed by Ramesh.
Answer:
Ramesh is hardworking and sincere. He showed concern for people and for the environment.
Question 2.
Why is biogas a better fuel than wood or cowdung cakes?
Answer:
Wood and cowdung cakes produce lot of smoke and ash, while biogas does not produce smoke or ash. Thus, biogas is much cleaner than cowdung cakes. Hence, biogas is regarded as a better fuel than wood or cowdung cakes.
Question 3.
Discuss how a neat and clean environment is good for ‘one and all’.
Answer:
Neat and clean environment is soothing for the eyes. It also helps in preventing spread of diseases. A neat and clean environment helps in comfortable life. Thus, neat and clean environment is good for ‘one and all’.
Something To Do
Question 1.
Make a poster on: ‘Energy saved today is the energy for tomorrow’.
Answer:
Do it yourself.
Question 2.
Make a presentation on ‘Wind energy and its practical uses’.
Answer:
Do it yourself.
Question 3.
Collect information about the following and discuss it with your classmates and teacher:
(a) What is meant by the ‘mileage’ of a vehicle?
(b) Do all vehicles give the same ‘mileage’?
(c) How can one get a better ‘mileage’ from a vehicle like a car?
Answer:
Do it yourself.
Question 4.
Collect information about how solar energy can be used to get electricity. Find out the names of some places where ‘solar power projects’ are being put to use.
Answer:
Do it yourself.
DAV Class 5 Science Chapter 9 Solutions – Fuels
I. Multiple Choice Questions (MCQs)
1. Which of these is mainly used in kitchens in cities?
(a) Kerosene
(b) LPG
(c) Firewood
(d) Cowdung cakes
Answer:
(b) LPG
2. Which is the main fuel for power plants?
(a) Coal
(b) Petrol
(c) Diesel
(d) Wood
Answer:
(a) coal
3. Where CNG is mainly used as fuel?
(a) Kitchen
(b) Train
(c) Automobile
(d) Power plants
Answer:
(c) automobiles
4. Which of the following can be an ideal fuel for villages?
(a) Petrol
(b) Diesel
(c) Coal
(d) Biogas
Answer:
(d) Biogas.
II. Fill in The Blanks
Question 1.
A fuel produces energy on ______
Answer:
burning
Question 2.
LPG is ______ fuel than coal.
Answer:
cleaner
Question 3.
Cleaner fuels are ______ eco-friendly.
Answer:
more
Question 4.
______ was used as fuel in steam engines.
Answer:
coal.
III. Define The Following
Question 1.
Fuel
Answer:
A substance which produces energy on burning is called fuel.
Question 2.
Fossil fuel
Answer:
Fuel which was formed from decomposition of living things over a period of millions of years is called fossil fuel.
Question 3.
Eco-friendly fuel
Answer:
A fuel which produces the least amount of pollution is called an eco-friendly fuel.
Question 4.
Cleaner fuel
Answer:
A fuel which produces no smoke and no ash is called a cleaner fuel.
IV. Answer the Following Questions in One Word
Question 1.
What are the different types of fuels? Give one example of each.
Answer:
There are three types of fuels:
(a) Solid fuel: coal and firewood
(b) Liquid fuel: Petrol and diesel
(c) Gaseous fuel: LPG and biogas
Question 2.
What are the uses of fuel?
Answer:
Energy is required for many purposes. We need energy for cooking, for moving trains, automobiles and aeroplanes. We need energy for generating electricity and for running machines. For all these purposes, we use different types of fuels.
Question 3.
Explain domestic uses of fuels.
Answer:
Domestic uses of fuels are as follows:
- Firewood was the only fuel for early man. Firewood is still used in rural areas as kitchen fuel.
- Cowdung cakes, coal and kerosene are also used; mainly in rural areas.
- Now-a-days, most of the modem households use LPG and PNG as kitchen fuel. Biogas is also used in both urban and rural areas.
Question 4.
Suggest some steps to reduce environmental pollution.
Answer:
Some Steps to prevent environmental pollution are:
- We should use bicycle or we should walk when we need to go to a nearby place.
- We should use buses and metro trains; instead of cars and bikes.
- We can also do car-pooling.