Last updated on April 11th, 2023 at 10:53 pm
Class 8 Coal and Petroleum Extra Question Answers
Class 8 Coal and Petroleum Extra Question Answers | Class 8 Science Question Answers | for the students of cbse / icse and all board exams.
Answer the following questions
Class 8 Coal and Petroleum Notes
Q: Define Inexhaustible Resources.
A: Inexhaustible resources are those that exist in unlimited quantities in nature and are unlikely to be exhausted by human activities.
Q: Define Exhaustible resources.
A: Exhaustible natural resources are those resources in nature that exist in limited quantities and can be exhausted by human activities.
Q: What is a fossil?
A: The fossils are the remains of plants or animals that were buried under the earth millions of years ago.
Q: What is fossil fuel?
A: Fossil fuels are natural fuels formed from buried remains of long-dead organisms buried deep within the earth. The dead remains of living organisms (plants and animals) buried under the earth millions of years ago produced fossil fuels.
Q: What are examples of unlimited natural resources?
A: Examples of unlimited natural resources are sunlight and air.
Q: What are examples of exhaustible natural resources?
A: Examples of exhaustible natural resources are forests, wildlife, minerals, coal, petroleum, and natural gas.
Q: What is coal and how is it formed?
A: Coal is a black and hard fossil fuel consisting mainly of carbon that was formed from the decomposition of large land plants and trees, buried under the earth about 300 million years ago. It underwent carbonisation due to high pressure and temperature.
Q: What are some uses of coal?
A: Coal is used as a fuel for cooking, in railway engines to produce steam, in thermal power plants to generate electricity, and as a fuel in various industries.
Q: What are some useful products obtained from coal?
A: Some useful products obtained from coal include coke, coal tar, and coal gas. Coke is used in the manufacture of steel and in the extraction of many metals.
Q: What is coal tar and what are some of its uses?