Which joint is commonly used to connect a back panel to the side of a cabinet to create a strong corner?

• A. Dowel joint
• B. Miter joint
• C. Rabbet joint
• D. Mortise and tenon joint

Answer: (C)

When attaching a back panel to the side of a cabinet, a rabbet joint is the best choice because it creates a dedicated groove along the edge of the side piece into which the back panel fits. This setup gives a large, continuous glue surface, helps keep the panel square, and resists racking, producing a strong, stable corner. It also allows the panel to sit flush with the inside edges and makes assembly straightforward, since the back simply drops into position. Other joints don’t provide the same combination of a secure seat and clean edge: a dowel joint relies on pins and can’t capture the full panel edge; a miter joint offers only a decorative 45-degree corner and can be weak at the back where the panel needs support; a mortise-and-tenon joint is excellent for frame corners but is more complex than necessary for a back panel and doesn’t give a built-in recess for the panel itself.