Monday 9 October 2017

CBSE Class 10 - Geography - Minerals and Energy Resources (Short Q and A) (#cbseNotes)

Class 10 - Geography Minerals and Energy Resources (Short Q and A)

Q1: What are Placer deposits?

Answer: Minerals that occur as alluvial fans in sands of valley floors, and the base of hills.

Q2: Define Rat-hole Mining.

Answer: In the tribal areas of North-East India mining is carried out by individuals or communities illegally. The mining is done in the form of a long narrow tunnel known as Rat hole mining.

Q3: Write two uses of Mica and also areas famous for mica deposits.

Answer: Mica is used in electric and electronic industries
Areas found in:
(a) Gaya-Hazaribagh inJharkhand, and
(b)Ajmer and Beawarin Rajasthan

Q4: What are three types of Coal? Write one difference of each type of coal?

Lignite coal-low grade brown coal soft with high moisture content. Found in Nevyel i(T.N)
Bituminous Coal- It contains 60-80% of carbon content.
Anthracite- Best quality, contains more than 80% of carbon content.

Q5: What are Geo-thermal Energy? Which are the two experimental projects of geothermal energy in India?

Geo-thermal energy refers to the heat and electricity produced by using the heat from the interior of the earth

Areas where the two experimental projects are done:
Parvati Valley near Manikarn in Himachal Pradesh
Puga valley in Ladakh

Q6: Distinguish between Ferrous and Non-ferrous minerals.

Answer: Minerals containing iron are called ferrous minerals, e.g., iron ore, manganese, nickel cobalt. Minerals
which do not contain iron are called non-ferrous minerals, e.g., bauxite, lead and gold.

Q7: Distinguish between Conventional and Non-conventional sources of energy.

Answer: Conventional sources of energy are generally exhaustible and polluting, e.g., rewood, coal and petroleum. Non conventional or renewable sources of energy are usually inexhaustible and non-polluting,
e.g., solar, wind, tidal and atomic energy.

Q8: Why is mining activity often called a “Killer Industry”. Give three reasons.

High risk involved
Due to poisonous fumes, mines are vulnerable to workers for pulmonary diseases.
Risk of collapsing mines roofs, and fires in coal mines.
Water sources get contaminated.

Q9: How are minerals formed in igneous and metamorphic rocks?

Answer: In igneous and metamorphic rocks, molten/liquid and gaseous minerals are forced upwards through cavities towards the earth’s surface. They then cool and solidify as they rise. They are seen in cracks, faults and joints . The smaller occurrences are called veins while the larger are lodes.

Q10: Why does solar energy in Rajasthan have great potential as non –conventional source of energy?

Hot and dry region
Clear sky almost whole year
Cheaper installation
Renewable and pollution free energy source.
Government motivation

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