Correct Answer: B. Pargeting
Solution:
Pargeting is a traditional term for the plastering of an external wall face. It often refers to decorative or ornamental plasterwork, but can also be used for plain plastering.
Correct Answer: A. 9
Solution:
A traditional or standard non-modular brick in many regions is nominally 9 inches long. A "one-brick wall" has a thickness equal to the length of a single brick. Therefore, the thickness is 9 inches.
Correct Answer: D. 40
Solution:
A standard modular brick has a nominal length of 20 cm. A "two-brick wall" has a thickness equal to twice the length of one brick, arranged side-by-side as headers. Therefore, the thickness is 20 cm + 20 cm = 40 cm.
Correct Answer: C. Modular bricks
Solution:
Modular bricks are manufactured to specific, uniform sizes and quality standards. This uniformity in shape, size, and strength makes them ideal for high-class, systematic, and structurally sound brick masonry. Jhama bricks are over-burnt and irregular, while under-burnt bricks are weak.
Correct Answer: A. For preventing absorption of moisture from mortar by bricks
Solution:
Dry bricks are highly porous and will rapidly absorb water from the fresh mortar. This rapid loss of water prevents the cement in the mortar from hydrating properly, leading to a weak bond between the brick and mortar. Soaking the bricks ensures they are saturated and do not draw essential water from the mortar, allowing for a strong, durable joint to form.
Correct Answer: A. Right angles
Solution:
For maximum strength, stones should be laid so that the direction of the applied pressure is at right angles (normal/perpendicular) to the natural bedding plane (the layers in which the stone was formed). This prevents the stone from splitting along its natural layers.
Correct Answer: C. Queen closer
Solution:
A Queen closer is a brick cut in half along its length. It results in two pieces that are the same length as the original brick but half the width. It's used to create the proper bond lap in brickwork.
Correct Answer: D. arches
Solution:
A bull nose brick has one or more rounded corners and is specifically designed for softening sharp angles, such as on corners, pillars, or sills. Arches require specially tapered, wedge-shaped bricks called voussoirs to form the curve, so a bull nose brick is not suitable for this purpose.
Correct Answer: C. King closer
Solution:
A King closer is made by cutting off a triangular portion of a brick between the center of one header face and the center of one stretcher face. The resulting shape is essential for creating strong bonds at wall corners.
Correct Answer: D. Any of these
Solution:
Brick masonry can fail in several ways. Poor bonding can lead to cracks along vertical joints. Excessive lateral force can cause shearing along horizontal mortar beds. Overloading can cause the bricks themselves to crush. Therefore, any of these are potential modes of failure.
Correct Answer: A. Normal to the direction of pressure they carry
Solution:
For maximum structural stability, stones are always placed so that the load they carry is applied normal (perpendicular) to their natural bedding plane. This prevents the stone from splitting along its natural layers under pressure.
Correct Answer: D. brick masonary
Solution:
A king closer is a specific type of cut brick. It is used in brick masonry, typically at the corners of walls, to help create a proper bond between courses.
Correct Answer: B. Less
Solution:
A freely standing wall has less stability against lateral forces and buckling. When a wall supports an RC slab, the slab provides lateral restraint at the top, which increases the wall's stability and its effective load-carrying capacity. Therefore, the capacity of the free-standing wall is less.
Correct Answer: B. 0.96 m
Solution:
For stability, the resisting moment due to the wall's self-weight must equal the overturning moment from wind pressure. Assuming a standard brick density (approx. 1920 kg/m³), the calculation balances these forces to find the maximum stable height. The calculation yields a height of approximately 0.96 m.
Correct Answer: B. 9 to 13 cm
Solution:
The consistency of mortar, often measured by the slump test, determines its workability. For brick masonry, the mortar needs to be stiff enough to support the weight of the bricks but plastic enough to spread easily. A slump value in the range of 9 to 13 cm is generally considered ideal for this purpose.