Question 1

Which of the following is the primary component of Steel?

Accepted Answer

Iron. Iron is the main constituent of steel, making up the vast majority of its weight. A small amount of carbon is added to iron to create this incredibly strong and versatile alloy. Steel is widely used in construction and infrastructure due to its high tensile strength.

Question 2

What is the key difference between Brass and Bronze?

Accepted Answer

Brass contains Zinc while Bronze contains Tin. Brass is primarily an alloy of copper and zinc, whereas bronze is an alloy of copper and tin. Both alloys use copper as the base metal but vary in their secondary component. Zinc provides brass with its golden appearance, while tin makes bronze harder.

Question 3

Which alloy is specifically used for making permanent magnets?

Accepted Answer

Alnico. Alnico is an acronym for Aluminum, Nickel, and Cobalt, which are its primary components. This alloy is highly effective for creating strong permanent magnets used in speakers and motors. It exhibits excellent temperature stability and resistance to demagnetization.

Question 4

In the composition of 'Stainless Steel', which element provides corrosion resistance?

Accepted Answer

Chromium. Chromium reacts with oxygen to form a thin, invisible layer of oxide that prevents further rusting. This protective layer makes stainless steel ideal for kitchenware and medical instruments. Usually, at least 10.5% chromium is required to achieve this stainless property.

Question 5

What is the main component of the alloy used in aircraft bodies due to its light weight?

Accepted Answer

Aluminum. Aluminum is the base for alloys like Duralumin, which are lightweight yet very strong. These properties are essential for reducing the overall weight of aircraft to improve fuel efficiency. Aluminum is the third most abundant element in the Earth's crust.

Alloys — Set 1