SOLDERING MCQ – ITI Fitter Trade theory
1) In the process of soldering, you have noticed solder not sticking to sufficiently heated copper soldering bit when rubbed over solder bar. What step do you take to overcome the problem? *
Clean the bit thoroughly
Rub the bit over solder for longer period
Preheat the solder
Change the soldering bit shape
Correct Answer (A)
2) Which one of the following statements is correct? .
Soldering is used to join surfaces not under high-strength forces
The filler metal (solder) melts at temperature higher than 427°C
Most soft solders are alloys of tin and Copper
Solder has relatively high tensile strength
Correct Answer (A)
3) Solders with a tin content of ………………. or more are classified as fine solders and are used in soldering instruments where temperatures are critical.
30%
40%
50%
60%
Correct Answer (D)
4) Special solders are used for specific purposes. Which solder is used to solder food handling vessels?
Lead and tin
Copper and zinc
Tin and antimony
Silver and copper
Correct Answer (C)
5) For soldering which one of the following metals, zinc chloride is NOT used as flux?
Brass
Steel
Tin
Lead
Correct Answer (D)
6) A soldering bit consists of a piece of …………………….fastened to an iron rod with a wooden handle.
Copper
Lead
Tin
Zinc
Correct Answer (A)
7) This is a soldering process in which two surfaces are soldered together without allowing the solder to be seen. What is this process called?
Sweat soldering
Seam soldering
Wet soldering
Hem soldering
Correct Answer (A)
8) As a safety precaution you should avoid touching your face while working with solder, because most solders contain
Lead
Aluminium
Antimony
Copper
Correct Answer (A)
9) The composition of soft solder is …………………
lead-37%, tin-63%
lead-50%, tin-50%
lead-63%, tin-37%
lead-70%, tin-30%
Correct Answer (A)
