Alloys — Set 1
Chemistry · मिश्र धातुएं · Questions 1–10 of 50
Which of the following is the primary component of Steel?
Correct Answer: C. 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.
What is the key difference between Brass and Bronze?
Correct Answer: B. 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.
Which alloy is specifically used for making permanent magnets?
Correct Answer: C. 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.
In the composition of 'Stainless Steel', which element provides corrosion resistance?
Correct Answer: C. 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.
What is the main component of the alloy used in aircraft bodies due to its light weight?
Correct Answer: C. 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.
Which alloy is commonly used for joining electrical wires?
Correct Answer: A. Solder
Solder is an alloy of lead and tin with a low melting point suitable for electrical connections. It melts easily to create a bond between two metal surfaces without damaging them. Modern soldering often uses lead-free alloys for safety and environmental reasons.
The alloy 'German Silver' actually contains no amount of which metal?
Correct Answer: B. Silver
Despite its name, German Silver contains zero percent silver and is made of copper, zinc, and nickel. It is called 'silver' only because of its silvery-white luster and appearance. This alloy is frequently used for making decorative items and musical instruments.
Which element is added to mercury to form an 'Amalgam'?
Correct Answer: A. Any metal
An amalgam is formed when mercury is mixed with almost any other metal except iron and platinum. Dentists commonly use silver-based amalgams for filling cavities in teeth. Mercury is the only metal that remains liquid at room temperature.
What is the approximate percentage of Carbon in Steel?
Correct Answer: C. 0.1% to 1.5%
The carbon content in steel is very low, usually ranging between 0.1% and 1.5%. This small amount of carbon significantly alters the properties of iron to make it harder. If the carbon content exceeds 2%, it is classified as cast iron instead of steel.
Which alloy is known for its high resistance to heat and is used in heating elements?
Correct Answer: D. Nichrome
Nichrome is an alloy of nickel and chromium that has a high electrical resistance and melting point. When electricity passes through it, it generates heat without oxidizing or melting. It is the standard material used in electric heaters, toasters, and hair dryers.