5. Coal And Petroleum Class 8 Science [LATEST] Solutions Text Book Exercise in English - CBSE Study
NCERT Solutions for Class 8 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 5. Coal And Petroleum with detailed explanations and step-by-step answers for better exam preparation. Each Text Book Exercise is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 8 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 8 English Medium Science All Chapters:
5. Coal And Petroleum
2. Text Book Exercise
Exercise
Q1. What are the advantages of using CNG and LPG as fuels?
Answer : The advantages of using CNG and LPG are as follows :
(i) These are clener fuels.
(ii) These are low coct fuels.
(iii) These are available easily.
(iv) These can be used directly for buring in homes and factories where it can supplied through pipes.
Q2. Name the petroleum product used for surfacing of roads.
Answer : These days bitumen, a petroleum product is used for surfacing the roads in place of coaltar.
Q3. Describe how coal is formed from dead vegetation. What is this process called?
Answer: About 300 million years ago, earth was having dense forests in low lying wet land areas. Due to earthquakes and volcanic erruptions, these forests got buried under he soil. As more soil deposited over them, they were compressed. The temperature also raised as they sank deeper and deeper. Due to high temperature and lack of oxygen dead plants inside the earth got slowly converted to coal. As coal contains manily carbon, the slow process of conversion of dead vegetation into coal is called carbonisation.
Q4. Fill in the blanks :
(a) Fossil fuels are , _____________ and __________ .
(b) Process of separation of different constituents from petroleum is called .
(c) Least polluting fuel for vehicle is .
Answer : (a) coal, petroleum, natural gas.
(b) refining.
(c) CNG (compressed natural gas).
5. Tick True/False against the following statements.
(a) Fossil fuels can be made in the laboratory. (T/F)
(b) CNG is more polluting fuel than petrol. (T/F)
(c) Coke is almost pure form of carbon. (T/F)
(d) Coal tar is a mixture of various substances. (T/F)
(e) Kerosene is not a fossil fuel. (T/F)
Answer:
(a)-(f) (b)-(f) (c)-(t) (d)-(t) (e)-(f)
6. Explain why fossil fuels are exhaustible natural resources.
Answer:
Fossil fuels are present in nature is limited quantity and are being exhausted abundantly by us. That is why fossil fuels are called exhaustable natural resourses.
7. Describe characteristics and uses of coke.
Answer:
Coke is a tough, porous and substance. It is almost pure form of carbon. It is use vin the manufacture of steel and in the extraction of many metals.
8. Explain the formation of pertroleum.
Answer:
petroleum is formed from organisms living in the sea. When these organisms died, their bodies seettled at the bottom of the sea and got covered with layers of sand and clay. Over millions of years, they were transformed into petroleum and natural gas under the absence of air and presence og high temperature and pressure.
Q9. The following table shows the total power shortage in india from 1991 - 1997. show the data in the from of a graph. Plot shortage percentage for the years on the Y - axis and the year on the X - axis.
Answer:
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