Tag: in the land of kerala

Questions Related to in the land of kerala

Pig iron can be converted into steel by removing a lot of carbon contained in it, in a/ an:

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. electrolytic chamber

  2. bessemer converter

  3. blast furnace

  4. pyrite burner

Show answer
Correct Option: B
Explanation:

Solution:- (B) bessemer converter

The Bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron before the development of the open hearth furnace. The key principle is removal of impurities from the iron by oxidation with air being blown through the molten iron.

The removal of unwanted impurities by mechanical methods is known as:

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. finishing

  2. ore dressing

  3. smelting

  4. none of these

Show answer
Correct Option: B
Explanation:

As dressing is the process which have extraction and dressing. So, unwanted materials are removed through this method.

In manufacture of iron from Haematite, lime stone is added is act as:

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. slag

  2. an oxidizing agent

  3. a reductant

  4. flux

Show answer
Correct Option: D
Explanation:

Lime stone in the manufacture of Hematite ore is called flux. It removes unwanted material combining with gangue. 

Calcium silicate slag formed in extraction of iron :

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. prevents the reoxidation of molten iron.

  2. catalyses the combustion of carbon

  3. reduces $CO _2$ to $CO$ at the bottom of the furnace

  4. is used in cement industry

Show answer
Correct Option: A,D
Explanation:

Slag formed in extraction of iron is consists of $CaSiO _3$ which is further used for making cement.
Also, formation of this slag prevents the re-oxidation of molten iron.

Why do we need to separate different components of a mixture? Select the correct explanation from the following.

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. To remove the unwanted impurities

  2. To obtained pure substances

  3. To separate, two different but useful components

  4. All of these

Show answer
Correct Option: D
Explanation:

Mixtures have different physical and chemical properties compared with same metals. we need to separate different substances from mixtures as we want only useful substances and to obtain pure substances.

Matte contains mainly:

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. $FeS$

  2. ${Cu} _{2}S$

  3. ${Cu} _{2}S$ and $FeS$

  4. ${Cu} _{2}S$ and ${Fe} _{2}{S} _{3}$

Show answer
Correct Option: C
Explanation:

Matte contains mainly ${Cu} _{2}S$ and $FeS$. It also contains coke and sand. It is the molten metal obtained from the blast furnace.

Which element is present in Ruby as impurity?

geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

  1. $Cu$

  2. $Cr$

  3. $Au$

  4. $Zn$

Show answer
Correct Option: B
Explanation:

Chromium (Cr) metal is present in Ruby as an impurity. Ruby has pink to blood-red colour. It is a  gemstone. It is a variety of the mineral corundum (aluminium oxide).

What was the chief of Ur called?

geography kerala, from eighth to eighteenth century kerala during medieval period in the land of kerala study of kerala

  1. Urpathi

  2. Urraj

  3. Uralar

  4. Urlok

Show answer
Correct Option: C
Explanation:

The Kudis were the families of occupational groups engaged in agriculture. Many Kudis constituted the Ur. The chief of Ur was called Uralar.

The chief of Nadu were ______.

geography kerala, from eighth to eighteenth century kerala during medieval period in the land of kerala study of kerala

  1. Nadupathi

  2. Naduraj

  3. Nadular

  4. Naduvazhi

Show answer
Correct Option: D
Explanation:

After the end of the Perumal rule in the beginning of the 12th century, the Naduvazhis came in to force. Basically Naduvazhis means the territorial divisions which consisted of nadus further ruled by naduvazhis, which were divided into desams ruled by desavazhis who were directly under naduvazhis and subject to their dictation.

In the matters of administration, the $Perumals$ were assisted by $Naluthali$, the council of Brahmins.

geography kerala, from eighth to eighteenth century kerala during medieval period in the land of kerala study of kerala

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Perumals had representatives called Koyiladhikarikal. In the matters of administration the Perumals were assisted by Naluthali, the council of Bramhins. Perumals had a militia called Ayiram (Thousand). Perumals levied taxes from the Nadus, Nagaras (towns), Brahmin Gramas, temples, etc.