Minerals and Ores

The Moh's scale of mineral hardness characterises the scratch resistancy of various minerals through the ability of a harder material to scratch a softer material.

Correct option is (4).

Olivine is a gemstone-quality mineral used in jewelry, particularly peridot (gem-quality olivine). While mica and feldspar have industrial uses, and pyroxene is primarily an academic mineral, olivine's transparent green varieties are valued as gemstones. Peridot is one of the few gemstones that occurs in only one color (olive green).

Amphibole is one of the two main mineral groups that form asbestos (the other being serpentine). While chrysotile (serpentine) accounts for about 95% of commercial asbestos production, amphibole asbestos minerals like crocidolite and amosite are also significant asbestos varieties used in various industrial applications.

Mayurbhanj and Keonjhar districts in Odisha are famous for their manganese ore mines. Odisha is one of the leading producers of manganese in India, and these districts contain significant deposits of this essential mineral used in steel production and batteries.

Lignite is a brownish-black coal with relatively low carbon content and high moisture, often called 'brown coal'. It is the lowest rank of coal and is used primarily in electricity generation. The other options (chromite, bauxite, magnesite) are different minerals with distinct properties.

Khetri, located in Rajasthan's Jhunjhunu district, is famous for its copper mines and is one of India's oldest copper mining centers. The Khetri Copper Complex is a major copper production facility, making it synonymous with copper in India.

Asbestos is a naturally occurring mineral fiber known for its fire-resistant and heat-resistant properties. It has been widely used in construction and insulation materials due to these characteristics. The other options are incorrect - asbestos is not a mobile company, not a specific chemical element, and 'none of these' is incorrect since it is indeed fire-proof.

Statement 1 is wrong. Tungsten is used in the making of filaments of electric bulb. Statement 2 is correct. Iron is extracted from its ore called haematite.

Yes, it is the correct answer, as all the options are correct.

Yes, it is correct. Tin, copper and lead are found in igneous and metamorphic rocks.

Yes, gold and platinum are precious minerals.

Yes, magnetite is the finest iron ore with a very high content of iron up to 70%.

Yes, it is correct. Mica is a mineral which is made up of a series of plates or leaves.

Both options are correct.