Answer key

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Last edited 43 days ago by Learn LoopHQ.

Chapter: 07. Minerals And Ores

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Section A: Multiple Choice Questions (5 Marks)

(ii) Ores

(iii) Ductility

(iv) Magnetite

(iii) Bauxite

(iii) Limestone

Section B: Fill in the Blanks (5 Marks)

minerals

ferrous

Silver

black gold

shaft

Section C: True or False (5 Marks)

False. Minerals are not pure substances.

False. Non-metallic minerals generally have a dull appearance.

True.

False. Siderite is an inferior variety of iron ore with only about 48% iron. (Limonite contains about 60% iron).

True.

Section D: Short Answer Questions (6 Marks)

An ore is a naturally occurring solid material that contains a large amount of a particular mineral, usually a metal, which can be profitably extracted.

Minerals can be recognized by their colour, lustre (shine), hardness, and shape.

Two ferrous minerals are iron ore and manganese. Two non-ferrous minerals are gold and silver.

Coal is primarily used for generating electricity and in steel production.

Surface mining extracts minerals found close to the surface, while underground mining extracts minerals located deep within the Earth using shafts and tunnels.

Indians were among the earliest manufacturers and users of iron, with evidence of iron surgical instruments used as early as the 4th century BCE.

Section E: Identifying and Differentiating Concepts (2 Marks)

Exhaustible vs. Non-renewable resources: Both terms imply that resources are limited. “Exhaustible” means they can be used up quickly. “Non-renewable” specifically refers to resources that take an extremely long time (thousands to millions of years) to form naturally, making their rate of formation negligible compared to human consumption. Therefore, non-renewable resources are a type of exhaustible resource.

Section F: Diagram-Based Question (3 Marks)

Africa appears to have significant deposits of most of the metallic minerals shown (Iron, Bauxite, Copper, Gold, Manganese, Silver).

Two countries that appear to have abundant iron (black square) deposits are Australia and Brazil.

Gold (red diamond) seems to be widely distributed across North America, South America, Africa, and Australia.

Section G: Long Answer Questions (4 Marks)

It is important to conserve mineral resources because they are non-renewable, meaning they took thousands of years to form and cannot be easily replaced. With increasing global demand, these resources are being depleted rapidly. If not conserved, future generations may face severe shortages, impacting industries, energy supply, and overall economic development. Conservation practices like reducing consumption, reusing, and recycling are essential to ensure sustainable availability and minimize environmental damage.

Petroleum is a crucial energy resource, primarily known as fuel for a vast array of vehicles, including cars, trucks, trains, aeroplanes, and ships. However, its importance extends far beyond transportation fuel. When refined, petroleum yields numerous essential products vital for modern society, such as synthetic fibres for clothing, plastics for various goods, detergents, lubricating oils, and even components for cosmetics and pharmaceutical products. This wide range of applications across diverse industries makes petroleum indispensable to current global life and economy.

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