Last Updated on April 20, 2024 by XAM CONTENT
Hello students, we are providing case study questions for class 8 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 8 science. In this article, you will find case study questions for cbse class 8 science Chapter 3 Coal and Petroleum.
| Chapter | Coal and Petroleum |
| Type of Questions | Case Study Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 8 |
| Subject | Science |
| Useful for | Class 8 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 8 Science Chapterwise Case Study |
Case Study Questions on Coal and Petroleum
Questions
Nowadays we are very much dependent on fossil fuels. Increase in the use of coal and petroleum has led to difficulties in managing fossil fuels, and now the time is not far when we run on shortage of them. There are many steps taken by the different governments to decrease the consumption of fossil fuels such as promoting natural gases and making it mandatory for all the vehicles or promoting the usage of electric vehicles on subsidised costs. Coal and petroleum are very useful sources. We need to save them so that it gets easier to manage our natural resources. There are many alternatives like solar energy, electric vehicles, etc which are environment friendly. Many countries are trying to replace all the vehicles which run on diesel and petrol with electric vehicles by 2030. Some serious steps need to be taken in order to manage these sources and save our environment.
Q. 1. An ideal fuel should have a _________calorific value.
(a) Low
(b) High
(c) Sufficient
(d) None of the above.
Difficulty Level: Easy
Ans. Option (b) is correct.
Explanation: An ideal fuel should have a high calorific value because calorific value of a fuel is the amount of heat liberated on complete burning of a unit mass or volume of a fuel. It is expressed in kJ/kg.
Also read: Coal and Petroleum Assertion Reason Questions for Class 8 Science
Q. 2. Which of the following is not a fossil fuel?
(a) Kerosene
(b) Coal tar
(c) Water
(d) Petrol
Difficulty Level: Easy
Ans. Option (c) is correct.
Explanation: Water is not a fossil fuel. It is a natural resource which is present in unlimited quantity in nature and will not get replenish.
Q .3. Explain how the use of CNG in automobiles has reduced pollution in our cities.
Difficulty Level: Medium
Ans. Compressed Natural Gas (CNG) is a clean fuel and does not give smoke when burnt as compared to other petroleum containing fuels like petrol and diesel.
- For automobiles to run, petroleum fuel is burnt.
- The combustion of fuel leaves unburnt carbon particles in the air, along with carbon monoxide (CO) – poisonous and harmful gas.
- Breathing CO causes headache, dizziness, etc.
- CNG burns completely leaving no harmful residue. Hence, the use of CNG in automobiles has reduced pollution in our cities.
Q.4. What are petrochemicals?
Difficulty Level: Medium
Ans. Petrochemicals are chemical products obtained from petroleum and natural gas are used in the manufacture of detergents, fibers (polyester, nylon, acrylic etc.), polythene and other man-made plastics. Hydrogen gas is obtained from natural gas, is used in the production of fertilisers (urea).
Also check
- Chemical Effects of Electric Current Class 8 Case Study Questions Science Chapter 11
- Sound Class 8 Case Study Questions Science Chapter 10
- Friction Class 8 Case Study Questions Science Chapter 9
- Force and Pressure Class 8 Case Study Questions Science Chapter 8
- Reaching the Age of Adolescence Class 8 Case Study Questions Science Chapter 7
- Reproduction in Animals Class 8 Case Study Questions Science Chapter 6
- Conservation of Plants and Animals Class 8 Case Study Questions Science Chapter 5
- Combustion and Flame Class 8 Case Study Questions Science Chapter 4
- Coal and Petroleum Class 8 Case Study Questions Science Chapter 3
- Microorganisms: Friend and Foe Class 8 Case Study Questions Science Chapter 2
- Crop Production and Management Class 8 Case Study Questions Science Chapter 1
Topics from which case study questions may be asked
- Discussing about the types of natural resources.
- Learning about fossil fuels.
- Learning about coal and the products we obtain from it.
- Understanding how petroleum was formed.
- Learning the importance of natural gas as fuel.
- Knowing the ways to save fossil fuels as they are exhaustible.
We require various materials to fulfill our basic needs. Some of them are found in nature and some have been made by human efforts. The various resources which are obtained from nature are called natural resources, e.g., air, water, soil, etc. This chapter deals with some of the natural resources and how they are useful to us.
