Out of the following, the joint produced by __________ has the lowest strength.

ANS:A - soldering

Out of the options provided, the joint produced by soldering typically has the lowest strength compared to welding, brazing, and riveting. Here's a brief explanation of each:

1. Soldering: Soldering involves joining two metal pieces by melting a filler metal (solder) with a lower melting point than the base metals. While soldering creates a bond between the parts, the strength of the joint is generally lower compared to welding, brazing, or riveting. Soldered joints are suitable for low-stress applications and electronic connections.
2. Welding: Welding involves melting and fusing the base metals together, typically using heat and pressure. Welded joints can have high strength and are often used in structural applications where a strong and permanent bond is required.
3. Brazing: Brazing is similar to soldering but involves using a filler metal with a higher melting point. The filler metal is melted and flows into the joint through capillary action. Brazed joints can have higher strength compared to soldered joints but may not be as strong as welded joints.
4. Riveting: Riveting involves joining two or more metal pieces using mechanical fasteners called rivets. While riveted joints can provide good strength, they may not always match the strength of welded joints. However, riveting is often used in applications where disassembly is required or where welding is not feasible.