CBSE 2025 · Region 6 · Set 1 · Q37 · 4 marks
Many pure metals like copper, iron and gold are very soft and as such are considered unsuitable for certain uses. Metallic objects around us such as cooking utensils, statues, ornaments, guns etc. are actually not made up of pure metals. Instead of pure metals, alloys are used in the design of most of the useful objects. Making alloys enhances the basic properties of a metal which is the primary constituent (metal) of an alloy.(I)How does electrical conductivity and melting point of a metal change when it is converted to its alloy by mixing a small amount of an element in it ?(II)Name an alloy used for welding two wires together in an electric circuit. Write its major constituents.(III)What are alloys ? How is 'Brass' (an alloy) prepared ?What is stainless steel ? How is it prepared ? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.
Many pure metals like copper, iron and gold are very soft and as such are considered unsuitable for certain uses. Metallic objects around us such as cooking utensils, statues, ornaments, guns etc. are actually not made up of pure metals. Instead of pure metals, alloys are used in the design of most of the useful objects. Making alloys enhances the basic properties of a metal which is the primary constituent (metal) of an alloy.
(I)
How does electrical conductivity and melting point of a metal change when it is converted to its alloy by mixing a small amount of an element in it ?
(II)
Name an alloy used for welding two wires together in an electric circuit. Write its major constituents.
(III)
What are alloys ? How is 'Brass' (an alloy) prepared ?
What is stainless steel ? How is it prepared ? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.
Marking-scheme solution
(I)
Both electrical conductivity and melting point of an alloy becomes less than that of a pure metal. (Although in some cases the melting point may increases)
(II)
Solder
Lead (Pb) & tin (Sn)
(III)
An alloy is a homogenous mixture of two or more metals or a metal and a nonmetal.
Brass is an alloy is prepared by mixing Copper and Zinc in
definite proportion.Stainless steel is an alloy of steel (iron) mixed with nickel
and chromium.Iron is first mixed with small amount of carbon ($\displaystyle 0$•$\displaystyle 05$%) so
that it becomes hard and strong when, then it is mixed with Ni and Cr metals, stainless steel is formed.Do not rust
Metals and Non-metalsOccurrence and Extraction of MetalsUnderstandcase_studymedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.