If you are looking for DAV Class 8 SST Chapter 4 Question Answer Mineral and Energy Resources of we and our world social science book, then you are at right place. Here at SOLUTIONGYAN.Com, Class 8 SST of chapter 4 exercises provided at the end of the chapter will be a useful resource for DAV Class 8 Social Science exam.
Here, we provide complete solutions of DAV Class 8 SST Chapter 4 Mineral and Energy Resources of We and Our World SST Textbook. These exercise of sst chapter 4 (Geography) contains 5 questions and the answers to them are provided in the DAV Class 8 SST Chapter 4 Question Answer Mineral and Energy Resources.
Solutions of DAV Class 8 SST chapter 4 Mineral and Energy Resources of Geography is help to boost the writing skills of the students, along with their logical reasoning. Students of class 8 can go through Social Science chapter 4 solution to learn an effective way of expressing their answer in the dav school sst exam.
DAV Class 8 SST Chapter 4 Mineral and Energy Resources Solutions
DAV Class 8 Social Science Chapter 4 Mineral and Energy Resources Solutions is given below. Here DAV Class 8 SST chapter 4 question answer is provided with detailed explanation.
- Tick the correct option
- Fill in the blanks
- Write a technical term
- Answer the following questions in brief
- Answers the following questions
DAV question answer of Class 8 Geography of We and Our World Social Science Textbook is the best source for the students to self-analyse their performance. DAV Class 8 students are more likely to score good marks in SST exam if they practise DAV Class 8 SST Chapter 4 Question Answer Mineral and Energy Resources regularly.
DAV Class 8 SST Chapter 4 Question Answer
A. Tick the correct option.
1. Which one of the following is not a characteristic of rocks?
Answer: These have a definite mineral composition.
2. Which one of the following is the best quality of coal?
3. The major oilfields of India are located in which one of the following states of India?
4. The metallic minerals used in electrical industry are-
Answer: copper and bauxite
5. Petroleum is not extracted from the oilfields of North Sea by-
B. Fill in the blanks.
1. A mineral is extracted from the region where its concentration is ___________.
2. ___________ minerals are divided into ferrous and non-ferrous.
3. ___________ is obtained from bauxite ore.
4. Petroleum, coal, ___________ and hydroelectricity are conventional sources of energy.
5. ___________ and ___________ are the major types of iron ore.
Answer: (1) high (2) Metallic (3) Aluminium (4) natural gas (5) Hematite, Magnetite.
C. Write a technical term or an appropriate word for each of the following statements.
1. Energy generated by turbines run by water falling from a height.
2. The resultant metal with improved strength which is produced by mixing two or more than two metals.
3. Materials formed inside the earth by the decomposition of dead remains of plants and animals in sedimentary rocks.
Answer: Fossil fuels
4. Mineral deposits that are formed when a river erodes rock constituents from a primary source and deposits them in the river beds.
Answer: Placer deposits
5. The process of extracting minerals from the earth’s crust.
D. Answer the following questions in brief.
1. What is a mineral? Mention the three main processes of mineral extraction.
Answer: Mineral is a naturally occurring inorganic substance. Three processes are:
- Mining: In this process metals are extracted by digging the earth.
- Drilling: In this narrow but deep drills are duged to extract the mineral.
- Quarring: In this metals are extracted for building process.
2. What is tidal energy? How can it be harnessed?
Answer: The energy obtained from the rise and fall of tides is called tidal energy.
Tidal energy is harnessed by constructing a dam across a narrow opening to the sea. A turbine fixed at the opening of the dam converts tidal energy to electricity.
3. Why do we need to conserve mineral resources? Explain any three reasons.
Answer: We need to conserve mineral resources for the following reasons:
- Mineral Sources being found on the earth’s crust are limited in number.
- They are exhaustible. (They can be used and utilised but cannot be renewed.)
- If we don’t conserve them, they run out and the future generation yet to come may never know of them.
4. What are two types of energy sources? Which one of them is a better resource and why?
Answer: Two types of energy sources are:
- Conventional sources of energy.
- Non-Conventional sources of energy.
Non-Conventional source of energy is better because these are not limited and does not cause any type of pollution.
5. Highlight any three advantages of using nuclear energy.
Answer: Three advantages of using nuclear energy are:
- It is less expensive to install.
- It can reduce the emission of greenhouse gases.
- It is a very powerful and efficient source of energy.
E. Answer the following questions.
1. How are minerals useful to us? Explain with the help of examples.
Answer: Mineral resources provide the foundation for economic and industrial development. It improves the standard of living. It also helped in the progress of human civilisation during copper age, bronze age and iron age.
Example: Iron is used for manufacturing machines, automobiles, weapons, etc. Copper is widely used in electric goods such as generator, radio, etc. Bauxite is used in the manufacturing of electric wires, aeroplanes, etc.
2. In your opinion, electricity is a boon or a bane? Support your answer with relevant arguments.
Answer: In my opinion, electricity is a boon because electricity is one of the basic resources that are now used in the modern age.
Apart from the private usage of electricity, it is used in inventions and forming new scientific theories and concepts. New ways to produce electricity lead to sustainable development all around the world.
3. What is meant by nuclear energy? Explain the progress made by India in this field.
Answer: Nuclear Energy is the energy obtained from energy stored in nuclei of atoms of naturally occuring radioactive elements like uranium and thorium. It is a very powerful and efficient source of energy.
India have made several nuclear power plants and other educational institute to empower this research. Education is also spread by adding these courses in the syllabus of students so that their innovation can help India to grow better in this field.
4. Assess the importance of petroleum on the basis of its wide range of applications.
Answer: The importance of petroleum on the basis of its wide range of applications are:
- It is widely used as a source of power.
- It is widely used to run machines, generate electricity and produce steam.
- Railway engines, motor vehicles and ships depend on petroleum for their fuel requirements.
- It is used as a lubricant in machines and petro-chemical industries for preparing rubber, synthetic, fibres, etc.
5. Suggest any five measures to conserve minerals and energy resources.
Answer: Measures to conserve minerals are:
- Use of efficient methods of mining and processing to minimise the wastage.
- Recycling of mineral resources.
- Substituting the use of scarce minerals by those found in abundance.
Five measures to conserve energy resources are:
- Use of LED bulbs and tubelights.
- Use public transport.
- Switch off the light and fans when not in use.
- Use of power saving electronic devices.
- Use of non-conventional sources of energy, i.e., solar light, solar torch, solar gyser, etc.