Q. Which of the following materials has the least coefficient of linear expansion?

निम्नलिखित में से किस सामग्री में रैखिक विस्तार का गुणांक सबसे कम है?

A
Steel
इस्पात
B
Aluminium
अल्युमीनियम
C
Copper
ताँबा
D
Brass
पीतल

Explanation

Among the listed materials, steel has the lowest coefficient of linear expansion, which means it expands less than aluminium, copper, or brass for the same temperature rise. This property makes steel ideal for construction (e.g., in bridges or railways), where dimensional stability is crucial.

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