Which of the following is considered a masonry unit?

• A. Wood panel
• B. Glass block
• C. Steel beam
• D. Reinforced concrete

Answer: (B)

A masonry unit is a building material that is primarily made of inorganic materials and is designed to be laid in a permanent position to form walls, structures, or other built forms. Glass blocks are specifically designed to be used as masonry units in construction. They are often used in walls or dividers to allow light while maintaining some degree of privacy and thermal insulation. Being made from glass, these blocks are durable, aesthetically versatile, and can be integrated seamlessly into masonry construction.

Wood panels, while they may be used in various structural applications, are not considered masonry units since they are organic and typically not used in the same way as masonry to create permanent structures. Steel beams belong to the category of structural steel elements, and although they provide critical support in construction, they do not fall under the definition of masonry. Reinforced concrete is a construction material that is composed of concrete and steel, but it is also distinct from traditional masonry units. While concrete blocks are a form of masonry, the term "reinforced concrete" often refers to a composite material rather than individual masonry units.

Thus, glass blocks stand out as the correct choice among the options provided, as they fit the definition of a masonry unit due to their composition and intended use in construction.