NCERT Class 5 EVS Chapter 12 – What if It Finishes? help students understand the importance of natural resources, especially fuels, and why they have to be conserved. The chapter, as well as the solutions that we have provided here, has been designed to help students learn about different types of fuels and energy, and they will also make them aware of using natural resources, especially petrol, judiciously as they will not last forever. They will also learn about pollution and vehicles in general. In any case, these NCERT Solutions will further act as a great reference for students using which they can prepare well for exams.
Access NCERT Solutions for Class 5 EVS Chapter 12
Look at the picture and write:
Q1: What are the different kinds of vehicles that you can see?
Answer: I can see vehicles like cycles, cars, buses, motorcycles, scooters, auto rickshaws, etc.
Q2: What do you think they need petrol and diesel as fuel?
Answer: Cycles do not need any fuel, but other vehicles shown here need petrol or diesel as their fuel.
Q3: Which of the vehicles do you think give off smoke? Put a red mark on those.
Answer: The vehicles such as cars, buses, motorcycles and auto rickshaws give off smoke.
Q4: Which are the vehicles run without petrol and diesel?
Answer: The cycle can run without petrol and diesel.
Q5: What problems do we face from speeding vehicles?
Answer: It may cause accidents.
Q1: Do you ride a bicycle? If yes, where all do you go on it?
Answer: Yes, I ride a bicycle. I use the bicycle to go to the market and playground.
Q2: How do you come to school?
Answer: I come to school by bus.
Q3: How do your family members go to work from home?
Answer: My father goes by car, and my mother goes by scooter.
Q4: What problems can we have from smoke coming out of vehicles?
Answer: Smoke coming from vehicles can cause nausea, cough, lung diseases, headache and skin allergies.
Q5: What kind of problems can we face from the noise of vehicles (honking)?
Answer: Noise coming from vehicles cause headache and irritation.
Find out and discuss:
Q1: Which states of India have oil fields?
Answer: Andhra Pradesh, Gujarat, Maharashtra and Assam have oil fields.
Q2: Besides oil, what else is found deep inside the earth?
Answer: Besides oil, many minerals are found deep inside the earth, such as coal, gold, iron, copper, diamond, potassium, magnesium and zinc.
Q1: What all can vehicles run on?
Answer: Vehicles can run on petrol, diesel, LPG, solar energy and battery.
Q2: What kinds of problems will we face, if the number of vehicles keeps on increasing? For example, more traffic on the road. Talk to your elders and write about it.
Answer: If the number of vehicles keeps on increasing, it will lead to many problems, like increased traffic on the road, air pollution, noise pollution and accidents.
Q3: Manju said, “Why doesn’t everyone use a bus?” What do you think, why don’t people travel by bus?
Answer: Buses are overcrowded, and hence, people want to avoid them.
Q4: Suggest some ways to deal with the problems arising out of the growing number of vehicles.
Answer: People should prefer public transport like buses, trains, etc., and people should use carpools to avoid problems arising out of the growing number of vehicles.
Q5: What are the benefits, if we switch off the engine of the vehicles at the red light on the road?
Answer: It will save fuel if we switch off the engine of the vehicles at the red light on the road.
Find OUT and Write:
The rates of petrol are different in each city. The rates of petrol and diesel in Delhi are given here. Look at the table and answer the questions.
Q1: In 2014, as compared to 2007, the rate of petrol went up by ———rupees. The rate of diesel increased by ————rupees.
In 2014, as compared to 2007, the rate of petrol went up by 23.34 rupees. The rate of diesel increased by 28.49 rupees.
Q2: What was the difference in the rates of petrol and diesel from 2002 to 2007 and 2007 to 2014?
Answer: The difference in the rates of petrol from 2002 to 2007 is 13.61 rupees, and diesel is 11.57 rupees.
The difference in the rates of petrol from 2007 to 2014 is 23.34 rupees, and diesel is 28.49 rupees.
Q1: What is the price of petrol and diesel in your area?
Answer: The price of petrol in my area is ₹ 74.46 per litre, and the price of diesel is ₹ 66.84.
Q2: Why are the prices of petrol and diesel going up?
Answer: The prices of petrol and diesel are going up because their production is limited while consumption is increasing day by day.
Q3: In one month, how much petrol and diesel is used in your home? What is it used for?
Answer: It depends upon the distance we travel. It is used for vehicles.
See the poster and Write:
Q1: Where all is the oil used?
Answer: Oil is used for dry cleaning, lighting, as fuel for automobiles and aeroplanes, making plastic and paints, running machines and as kerosene and LPG.
Q2: Where is diesel used? Find out.
Answer: Diesel is used to running machines and as fuel for automobiles.
Think and discuss:
Q1: What would happen if you don’t get petrol or diesel for a week in your village or town?
Answer: If petrol and diesel are not available for a week, life will become difficult for everyone to travel and to do work in industries.
Q2: Suggest some ways to save oil.
Answer: Some of the measures to save oil are listed below.
1. Switch off the engines at the red light on the road.
2. Use more public transport than private.
3. Usage of alternative energies like solar and biogas.
4. Prefer walking or cycling for shorter distances.
Q1: Have you ever collected dry wood or made cow dung cakes? How are they made?
Answer: Yes, I have collected dry wood to make bonfires during winter. I have never made cow dung cakes but have seen them in villages. Hay is mixed with cow dung, and the mixture is given a circle shape and is sun-dried to make cow dung cakes.
Q2: Do you know anyone who collects dry wood or leaves to be used for lighting a chulha?
Answer: Yes, I have seen some people in villages collecting dry wood leaves for lighting a chulha.
Q3: Who cooks food in your family? What about other families in your area?
Answer: My mother cooks food in my family. In other families, women usually cook. In some families, servants also cook.
Q4: If they cook food using wood or upla (cow dung cakes), what difficulties do they face due to smoke?
Answer: The smoke from wood or cow dung creates many difficulties like lung diseases, headache, eye burning, nausea and problems related to respiration.
Q5: Can Durga use anything else instead of wood? Why not?
Answer: Yes, Durga can use cow dung instead of wood.
Change in fuel use over twenty years
Q1: In the year 1976, out of 100, how many houses used upla and wood?
Answer: 84 houses.
Q2: Which was the fuel used the least in 1976?
Q3: In 1976, LPG and kerosene were used in______houses, and in 1996, this increased to______. This means that in twenty years their use increased by________%.
In 1976, LPG and kerosene were used in 10 houses and in 1996, this increased to 18. This means that in twenty years, their use increased by 80%.
Q4: Out of 100, how many houses were using electricity in 1996?
Answer: 5 houses.
Q5: Which fuel was used the least in 1996? What percentage of houses used it in the year 1976?
Answer: Coal was used the least in 1996. In 1976, it was used in 5% of houses.
Find out from your elders
Q1: When they were young, what was then used for cooking food at home?
Answer: When they were young, coal, wood and cow dung were used for cooking food at home.
Q2: In the past 10 years, the use of which cooking fuel has increased in your area? Use of which fuel has decreased?
Answer: In the past 10 years, the use of LPG and electricity has increased. The use of cow dung and wood has decreased.
Q3: Guess the use of which fuel would increase and which would decrease in the next 10 years.
Answer: In the next 10 years, the use of LPG and electricity will increase. The use of cow dung and wood will decrease.