CBSE Class 8 Science Coal and Petroleum Worksheets with Answers - Chapter 5 - PDF
FAQs on CBSE Class 8 Science Coal and Petroleum Worksheets
1. How can I improve my marks in Science in Class 8?
Class 8 Science is like a stepping stone for students towards the higher classes. It has been observed that students often face difficulties learning various Science subjects. Vedantu understands this and has a dedicated team working around the clock to help solve these problems. You can attend Vedantu LIVE One-on-One Classes to help improve your Science preparation. You can even refer to Revision Notes for CBSE Class 8 Science to increase your marks further. In case any doubts arise, expert teachers will always be available to help you out.
2. What is the difference between exhaustible and inexhaustible natural resources?
Exhaustible natural resources refer to those resources which are limited and can be completely used up or destroyed because of human activity. Examples include forests, wildlife, minerals, etc. Fossil fuels like coal, petroleum, and natural gas also come under exhaustible natural resources. In contrast to this, inexhaustible natural resources are those which are unlimited and are not affected by human activity. They cannot be extinguished completely. Sunlight and air are two such examples of this kind of resource. To know more, click here.
3. How is coal formed?
Several million years ago, the earth’s surface was covered with dense forests. As a result of erosion and flooding, these forests were slowly buried under the soil over time. Due to high pressure and high temperature, the remains of dead plants and animals were compressed. A process called carbonization took place to form a carbon-rich compound named coal. This is why coal is also known as a fossil fuel. Coke and coal tar are other forms of coal obtained during mining.
4. How is the refining of petroleum carried out?
We all know that petroleum is a viscous, oily liquid that is a mixture of several components such as petroleum gas, petrol, diesel, lubricating oil, paraffin wax, and so on. The process of separating these constituents of petroleum from each other is known as refining. This process is carried out in massive petroleum refineries abiding by strict safety standards. Many useful substances are obtained from petroleum and natural gas after the refining process has been completed. These substances are known as petrochemicals.
5. What is CNG?
CNG stands for Compressed Natural Gas. When natural gas is stored under high pressure, it is termed CNG. This CNG is a relatively clean source of energy. This is the reason why most vehicles of public transportation have switched to using this fuel. Another advantage of using CNG is that it can be made available directly for cooking in homes via pipes. Even for industrial purposes, CNG is the right fit. Most metropolitan cities have already adopted CNG as the primary source of fuel to cut down on adverse environmental effects.