Minerals and Energy Resources Test - 28

Aluminium is known as wonder metal because it is used for various purposes. It is a light weight metal having low density, but it is very strong. This is why it is used extensively in aircrafts. Aluminium also resists continuous oxidation. That’s why it is an excellent choice for mild-pH, water-based applications. Aluminium forms a very good protective coating of aluminium oxide. Aluminium can be produced in large quantities at low cost.

 Mica has the exclusive combination of uniform dielectric steadiness, capacitance stability, enormous dielectric power, high Q factor and lower power loss, high electrical resistance and low temperature coefficient. It is highly regarded for its resistances to arc and corona discharge without causing any lasting injury.

The main source of aluminium in the world is bauxite ore. To generate alumina (aluminium oxide), the ore must first be chemically extracted. Alumina is then smelted to produce pure aluminium metal using an electrolysis process.

The correct answer is A .

The largest oil field of India is Bombay high. It is situated about 161 km north of Bombay coast in Mumbai, Maharashtra. It is off shore field. It produces near about 38% of our domestic production or 14% of India requirement. It is discovered by Russia & India oil exploration team in 1965.

Manganese is present in most commercially made steels. Manganese plays a key role in steel because of its two important properties namely (i) its ability to combine with sulphur (S), and (ii) its powerful deoxidation capacity. Manganese is undoubtedly the most prevalent alloying agent in steels, after carbon (C). Manganese is intentionally present in many grades of steel and is a residual constituent of virtually all others.

Manganese has played a key role in the development of various steel making processes and its continuing importance is indicated by the fact that about 85 % to 90 % of all Manganese consumed in the world annually goes into iron and steel making as well as in steel as an alloying element. No satisfactory substitute for Manganese in steel has been identified which combines its relatively low price with outstanding technical benefits.

The main source of aluminium in the world is bauxite ore. To generate alumina (aluminium oxide), the ore must first be chemically extracted. Alumina is then smelted to produce pure aluminium metal using an electrolysis process. Bauxite is usually found in different tropical and subtropical regions of the topsoil.

The correct answer is C .

Barium is used for both industrial and medical purpose. It is obtained from the mineral Barite. Barium is used for making paper, rubber, clutches of cars. It is also used in radiology for x-rays of the digestive system.

• Minerals are naturally occurring inorganic solids that have a crystalline structure and definite chemical composition.
  
• Minerals are referred to as naturally occurring because they are formed through natural geological processes.

 Commonly used to make cans, foil, and laminated paper or plastic packaging, aluminum is a lightweight, silvery white metal derived from bauxite ore, where it exists in combination with oxygen as alumina. Magnesium and manganese are often added to aluminum to improve its strength properties (Page and others 2003). Unlike many metals, aluminum is highly resistant to most forms of corrosion; its natural coating of aluminum oxide provides a highly effective barrier to the effects of air, temperature, moisture, and chemical attack.

Asbestos is a heat-resistant mineral, which is used extensively in many industries and also for household roofing. However, it is known to be very bad for the health of those working on them, and its use is now being banned all over the world.