AP TET Paper 2 Math and Science Model Paper 2

Concept:Solder is an alloy made mainly from lead and tin.Explanation:An alloy is a mixture of a metal with another metal or a non-metal.Solder is formed by combining lead ($\mathrm{Pb}$) and tin ($\mathrm{Sn}$).It usually contains about $60\%$ tin and $40\%$ lead.This composition gives solder a low melting point and good electrical conductivity.Hence, it is used to join electrical wires and components.From the given options, the constituents of solder are $\mathrm{Pb}$ and $\mathrm{Sn}$.Common alloy compositions include:Answer:Option B: Pb and Sn