Class VII EM T2 Resources Textbook Questions & Answers



GEOGRAPHY

Unit -I Resources

I. Choose the correct answer

1. Which one of the following is renewable resource?

a) Gold b) Iron

c) Petrol d) solar energy

Ans:d) solar energy

2. Where is the largest solar power project situated in India?

a) Kamuthi b) Aralvaimozhi

c) Muppandal d) Neyveli

Ans:a) Kamuthi 

3. Which is one of the first metals known and used by man?

a) Iron b) copper

c) Gold d) Silver

Ans:b) copper

4. -------------is one of the indispensable minerals used in electrical and electronics Industry.

a) Limestone b) Mica 

c) Manganese d) Silver

Ans:b) Mica

5. Electricity produced from coal is called---------------

a) Thermal Power b) Nuclear power

c) Solar power d) Hydel power

Ans:a) Thermal Power

II. Fill in the blanks

1. ------------ is the largest producer of hydroelectricity.

Ans: Chna

2. Iron ores found at ----------- in Tamil Nadu.

Ans: Kanjamalai

3. ---------- is produced from bauxite ore.

Ans: Aluminium

4. -----------is used in making electrical batteries.

Ans: Manganese

5. Petroleum and its derivatives are called--------------.

Ans: Black Gold

III. Match the following

1. Renewable resource - Wind energy

2. Metallic resource - Iron

3. Non-metallic resource - Mica 

4. Fossil fuel - Petroleum

5. Limestone - Sedimentary rock

IV. Consider the following statement and tick (✔) the appropriate answer 

1. Assertion (A) : Wind power is Clean Energy.

Reason (R) : Wind turbines do not produce any emissions

a. A and R are correct and R explains A

b. A and R are correct but R does not explain A 

c. A is incorrect but R is correct

d. Both A and R are incorrect

Ans: a. A and R are correct and R explains A

2. Assertion (A) : Natural gas is found with petroleum deposits.

Reason (R) : It can be used as a domestic and industrial fuel.

a. A and R are correct and R explains A

b. A and R are correct but R does not explain A

c. A is incorrect but R is correct

d. Both A and R are incorrect

Ans: a. A and R are correct and R explains A

V. Answer the following

1. Define - Resource.

Anything which can be used for satisfying human needs is called a resource.

2. What are the uses of iron?

  • Iron ore is the key raw material in making steel and 98% of the iron ore extracted is used to make Steel. 

  • Iron is used in the construction of machinery and machine tools, automobiles etc.

3. What are the major utilizers of solar energy in the world?

India, China, Japan, Italy and States of America are major utilizers of solar energy in the world.

4. Name the types of coal based on carbon content.

Coal is classified into four types based on carbon content. They are: 

  • Anthracite 

  • Bituminous 

  • Lignite 

  • Peat.

5. Give a short note on Duralumin.

Duralumin, Is a hard, light alloy of aluminium with copper and other elements.

VI. Distinguish the following

1. Biotic resources and abiotic resources

Biotic resources

Biotic resources are found in the biosphere which are obtained from living and organic materials. 

It includes forests, crops, birds, animals, fishes,fossil fuels such as coal and petroleum,  man and materials. 


Abiotic resources

Abiotic resources are the nonliving parts of an environment

Abiotic resources include land, water, air, sunlight and heavy metals including ores such as gold, iron, copper, silver etc.


2. Renewable resources and non-renewable resources


Renewable resources

A renewable resource is a resource which can be used repeatedly and replaced naturally

The use of renewable resources and energy sources is increasing worldwide.


Example: solar energy, wind energy, and hydropower. 


Non-renewable resources

Natural resources that once consumed and cannot be replaced are called non-renewable resources. 

Continuous consumption of non-renewable resources ultimately leads to exhaustion.


Fossil fuels such as coal, petroleum, natural gas and mineral resources such as iron, copper, bauxite, gold, silver etc.


3. Metallic resources and non-metallic resources


Metallic resources

Metallic resources are the type of resources that are composed of metals.

These are hard substances, which are the good conductors of heat and electricity.

Examples for metallic resources are iron, copper, gold, bauxite, silver, manganese, etc.


Non-metallic resources

Non-metallic resources can be described as the resources that do not comprise of metals

These are not hard substances, and are not good conductors of heat and electricity

Examples for non-metallic resources are mica, limestone, gypsum, dolomite, phosphate, etc.


VII. Give reason 

1. Aluminium has wide range of uses compared to other metals.

  • Aluminium is light in weight, tough and cheaper, which makes it popular metal for construction purpose. 

  • It is mainly used in the construction of aircrafts, ship, automobiles, railway coaches, etc. 

  • Aluminium is a good conductor of electricity and heat, hence, it is used for making electrical cables. 

  • It is highly resistant to corrosion.

So, aluminium has been used in various industries.

2. Water is considered as a great source of energy.

  • Water is considered as a great source of energy. 

  • Water is used for producing hydroelectric power. 

  • Hydroelectricity power is the cheapest and most versatile source of energy out of all the known energy. 

  • Hydroelectric power is a renewable resource. 

  • China is the largest producer of hydro-electricity.

  • Many other countries are also producing hydro-electricity.

VIII. Answer in a paragraph

1. Explain the different types of renewable resources.

A renewable resource is a resource which can be used repeatedly and replaced naturally. The use of renewable resources and energy sources is increasing worldwide. 

Solar energy 

The sun produces energy in the form of heat and light. Solar energy is not harmful to the environment. Photovoltaic devices or solar cells, directly convert solar energy into electricity. India, China, Japan, Italy and States of America are major utilizers of solar energy in the world. 

Hydropower 

Water is considered as a great source of energy. Hydroelectricity is generated from moving water, it is the cheapest and most versatile source of energy out of all the known energy. Hydroelectric power is a renewable resource. China is the largest producer of hydro-electricity.

Wind energy 

Wind power is clean energy since wind turbines does not produce any emissions. In recent years, wind energy has become one of the most economical and renewable energy technologies. Major wind energy producing countries are the United States, China, Germany, Spain, India, United Kingdom, Canada and Brazil.


2. Describe the non-metallic resources.

Non-metallic resources can be described as the resources that do not comprise of metals. These are not hard substances, and are not good conductors of heat and electricity.

Mica 

Muscovite and Biotite are the common ores of Mica. It is one of the indispensable minerals used in the electrical and electronics industry. It is used as an insulating material in the electrical industry. In powder form, it is used for making lubricating oils and decorative wallpapers.

Limestone 

Limestone is a sedimentary rock, composed mainly by skeletal fragments of marine organisms such as coral, foraminifera and molluscs. About 10% of sedimentary rocks are limestones. Mostly limestone is made into crushed stone and used as a construction material. It is used for facing stone, floor tiles, stair treads, windowsills and many other purposes. 

3. What are the different types of fossil fuel resources? Explain them.

Fossil fuel resources are normally formed from the remains of dead plants and animals. They are often referred to as fossil fuels and are formed from hydrocarbons. When fossil fuels are burned, they become a great source of heat energy. 

Coal 

Coal is the most abundantly found fossil fuel that forms when dead plant matter is converted into peat. It is used as a domestic fuel, in industries such as iron and steel, steam engines to generate electricity. Electricity produced from coal is called Thermal Power. Coal is classified into four types based on carbon content. They are: 1. Anthracite 2. Bituminous 3. Lignite 4. Peat.

Petroleum 

Petroleum is found between the layers of rocks and is drilled from oil fields located in Offshore and coastal areas. This is sent to refineries which process crude oil and produce a variety of products like diesel, petrol, kerosene, wax, plastics and lubricants. Petroleum and its derivatives are called Black Gold as they are very valuable.

Natural gas 

Natural gas is found with petroleum deposits and is released when crude oil is brought to the surface. It can be used as a domestic and industrial fuel. More than 50% of the global natural gas reserves are found in the United States of America, Russia, Iran and Qatar.


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