Tag: in the land of kerala

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

RCC is:

  1. the concrete having an iron framework inside it as a support

  2. the crushed cement in which more gravel is added

  3. prepared by adding calcium chloride to the limestone and calcium silicate

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

RCC is Reinforced concrete cement. It is a combination of concrete and steel to build a structure instead of using only concrete. Concrete is good in resisting compression and to gain resisting tension steel is added which has high tensile strength. To overcome the drawback of concrete, reinforced steel bars are used along with concrete.

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

___________ metals occur free in nature.

  1. Alkali

  2. Noble

  3. Iron

  4. Aluminum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A noble metal is any metal that is found in its metallic form, either pure or alloyed, in nature. Over geological time scales, very few metals can resist natural weathering processes like oxidation, which is why generally only the less reactive metals such as gold and platinum are found as noble metals.

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

The flux used in the extraction of iron:

  1. limestone

  2. silica

  3. coconut oil

  4. feldspar
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coke, limestone flux, and iron ore are charged into the top of the furnace in a precise filling order which helps control gas flow and the chemical reactions inside the furnace. Hence, The flux used in the extraction of iron is limestone. 

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

Specific gravity of slag is always:

  1. much greater than the molten metal

  2. less than the molten metal

  3. same as molten metal

  4. more or less the metal depending on the metal
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In blast furnace, products are collected at bottom. So, molten metal should be at bottom and slag is at up. So slag should have low density compared to molten metal.

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

Here an extraction process is given in steps. Identify the suitable ores corresponding to the process.
Pulverisation $\rightarrow$ Calcination $\rightarrow$ Smelting $\rightarrow$ Vacuum $\rightarrow$ Distillation

  1. Zinc blend

  2. Calamine

  3. Magnesite

  4. Zincite
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Zinc Sulphide and Calamine responds for the process because, in $ZnS$, only zinc comes at smelting and after process, high purity comes after distillation. similar to Calamine, after distillation, the metal obtained is pure.