Question 1

Question 4(f)What is the significance of Bhakra Nangal Project?

Accepted Answer

Significance of Bhakra Nangal project:It provides electricity for industrial, agricultural and domestic use.This project has helped in controlling floods in the river Sutlej downstream.It also helps in soil conservation, afforestation and development of fish culture.It benefits many industries like textile, cotton, sugar etc.

Question 2

Question 4(g)Write a note on the advantages and disadvantages of multipurpose projects.

Accepted Answer

Advantages of multipurpose projects are:Generation of hydroelectric power and thereby encourage the development of industries in the country.Provision of irrigation where the rainfall is scanty.Control of floods in the rivers.Development of river navigation.Afforestation for soil conservation.Disadvantages of multipurpose projects:Cost of building dams is very high.Building large dams can cause serious geological damage like triggering earthquake in the area.Dams alter the natural water table and have adverse impact on aquatic life.Setting up of multipurpose projects displaces many people from the area causing them hardships.

Question 3

Question 1Distinguish between renewable and non-renewable resources.

Accepted Answer

Sl.No.Renewable ResourcesNon-renewable Resources1.Renewable resources are those which have unlimited reserves, unlikely to get exhausted by human activities and can be renewed by natural process or by human efforts.Non-renewable resources are those which are found in limited quantities and are likely to get exhausted by human activities.2.Some examples are solar power, hydropower, wind power, tidal power, geothermal power, biogas.Some examples are coal, petroleum, natural gas, nuclear energy.

Question 4

Question 3Mention two advantages of hydropower. Name the state in which the Koyna hydroelectric project is built.

Accepted Answer

Two advantages of hydropower are:It is a cheap and renewable source of energy.It does not cause environmental pollution.The Koyna hydroelectric project is built in the state of Maharashtra.

Question 5

Question 4Which is the largest coal-producing country in the world? Mention two ways in which coal can be conserved.

Accepted Answer

China is the largest coal-producing country in the world.Two ways in which coal can be conserved are:Use of coking coal should be restricted to metallurgical industries.Selective mining for good quality coal should be stopped.

Question 6

Question 5Write the names of two countries which drill oil from the North sea. Mention two limitations of petroleum.

Accepted Answer

United Kingdom and Germany are the two countries which drill oil from the North sea.Two limitations of petroleum are:It is a non-renewable resource and can be exhausted due to increasing use.Burning of petroleum leads to carbon emission. Thus, it is a major source of air pollution.

Question 7

Question 3Differentiate between(a) Renewable and non-renewable sources of power.(b) Solar and wind energy

Accepted Answer

(a) Differences between renewable and non-renewable sources of power:S.No.Renewable source of powerNon-renewable source of power1.Renewable energy resources can be used again and again.Non-renewable energy resources cannot be used again and again.2.These are the energy resources which cannot get exhausted.After some years it will get exhausted.3.It has low carbon emission and hence environment friendly.It has high carbon emission and hence not environment friendly.4.Renewable energy resources are pollution free.The non-renewable energy resources are not pollution free.5.It has high maintenance cost.It has low maintenance cost.6.Solar energy, wind energy, tidal energy are some examples of renewable resources.Coal, petroleum, natural gases are some examples of non-renewable resources.(b) Differences between solar and wind energy:S.No.Solar energyWind energy1.Sun is the source of solar energy.Moving air i.e., wind is the source of wind energy.2.Solar panels are used to tap solar energy.Wind mills or wind turbines are used to tap wind energy.3.Solar power is only available during the day.Wind power is available even at night.4.Low maintenance.High maintenance.

Question 8

Question 1(h)Mineral oil is obtained fromSedimentary rocksIgneous rocksMetamorphic rocksIntrusive igneous rocks

Accepted Answer

Sedimentary Rocks

Question 9

Question 1(i)Electricity generated from the force of water falling from a height isHydroelectricityStatic electricityCurrent electricity

Accepted Answer

Hydroelectricity

Question 10

Question 1(j)The Bhakra Nangal project was commissioned in1963196419651966

Accepted Answer

1963

Question 11

Question 1(k)The Hirakud dam is built across ............... river.MahanadiGodavariDamodarBeas

Accepted Answer

Mahanadi

Question 12

Question 1(l)It is not a purpose of “multipurpose project”Provision of irrigationControl of floodsFish cultureWaste management

Accepted Answer

Waste management

Question 13

Question 1(m)The largest inexhaustible source of energySolarWindTidalWaves

Accepted Answer

Solar

Question 14

Question 1(n)It is not an advantage of solar energyNo pollutionLittle maintenanceIndefinitely renewableQuite expensive

Accepted Answer

Quite expensive

Question 15

Question 1(o)Hydroelectricity is notRenewableCheapCleanExhaustible

Accepted Answer

Exhaustible

Energy and Power Resources

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