Question

Solder is commonly seen with an electrician joining two points in a circuit by using a solder wire which is low melting and immediately solidifies. What is its composition?
(A) Sn and Pb
(B) Sn and Fe
(C) Fe and Pb
(D) Fe and Cr

Answer 1

Hint: The solder is the filler substance which creates a strong bond between the two metal workpieces. It is composed of metals that have low melting points. It is composed of elements from the carbon family. The two metals in the 14th group from the alloy solder.

Complete step by step answer:
Before starting with the question, let us have some information regarding what solder is and where it is being used.
Soldering is defined as a technique by which two or more items are joined together by melting and putting a filler material in the joint. This filler material is called the solder. The solder has a melting point lesser than the metals which it is joining.
The solder is composed of 60 % tin and 40 % lead majorly. Sometimes, it may even contain 2% silver in it. This alloy is greatly used to create a bond between the workpiece metals.

Thus, the correct option is the option (A).

Note: The soldering is different from welding. In the welding, the workpieces are melted and joined while in soldering, the workpieces are not melted. Instead, any other filler substance is melted which joins these two workpieces. Even the filler material is chosen such that it has a lower melting point than adjoining metals so that these workpieces do not get melted during joining.