Explore topic-wise InterviewSolutions in .

The correct CHOICE is (c) Dense CEMENT mortar

The explanation: The reinforcement is EMBEDDED by using dense cement mortar. Mortar STRENGTHENS the reinforcement and prevents the FORMATION of cracks.

Right choice is (d) Cavity block

To explain: Hollow clay blocks are available in various shapes and sizes. Various TYPES are partition block, fixing block, load-bearing block, RUG faced block, conduit block, ETC.

Right option is (b) False

The best explanation: Composite stone masonry is a combination of ashlar masonry and RUBBLE masonry. Rubble masonry is COMPOSED of irregular SHAPED stones, while ashlar masonry CONSISTS of REGULAR shaped stones and gives a smooth and pleasant appearance. Hence, rubble masonry is used in the backing of the wall while ashlar masonry is used in the facing.

Correct choice is (a) Cement MORTAR

For explanation I WOULD say: In brick-backed ASHLAR MASONRY, cement mortar should be used for construction. Cement mortar is used to FORM joints of uniform thickness and imparts strength to the masonry.

Correct ANSWER is (a) EITHER load-BEARING or non-load bearing

To explain: Concrete masonry uses TWO types of cement concrete blocks for the construction of walls – hollow concrete block and solid concrete block. Solid concrete blocks are USED only in load-bearing walls whereas hollow concrete blocks can be used for either load-bearing or non-load bearing walls.

Correct ANSWER is (d) 25%

The explanation is: Concrete MASONRY uses two TYPES of cement concrete blocks for the construction of WALLS – hollow concrete block and solid concrete block. A hollow concrete block has core-void AREA greater than 25% of the gross area.

The correct option is (C) Rubble-backed brick MASONRY

For EXPLANATION I would say: Bricks and stones can be SIMULTANEOUSLY used in THREE forms of composite masonry – brick-backed ashlar masonry, brick-backed stone slab facing and rubble-backed brick masonry. In brick-backed ashlar masonry, alternate courses of ashlar are present. Brick-backed stone slab facing is composed of bricks which are laid in courses with proper bonds whereas rubble-backed brick masonry is usually used at locations where rubble stone is available in huge amounts, but ashlar is not available.

Right choice is (b) Brick composite masonry

Easiest explanation: Composite masonry is the one that is constructed out of two or more than two types of building units or in which different types of building MATERIALS are used for CONSTRUCTION. It is of the following types – stone composite masonry, brick stone composite masonry, cement CONCRETE masonry, hollow CLAY TILE masonry, reinforced brick masonry and glass block masonry.

Right option is (b) TWO

The explanation is: In horizontal REINFORCEMENT, wrought iron FLAT BARS called hoop iron is extensively used. The number of strips of hoop iron used for one header brick is GENERALLY two.

The CORRECT OPTION is (a) True

Explanation: Grooved TILES are used only in those CASES where PLASTERING is to be done. In all other cases, smooth tiles should be used.

The correct answer is (a) First class bricks with HIGH compressive strength

Easiest explanation: Reinforced brickwork is the one in which the resultant composite masonry is capable of bearing any kind of TENSILE or shear stresses in ADDITION to the compressive stresses. Therefore, it uses first class bricks with high compressive strength in order to impart great strength to the RESULTING masonry.

The correct choice is (a) Air within the CELLS of blocks

The best explanation: Hollow clay blocks are fireproof and THERMALLY insulated. The reason behind their good thermal insulation is the PRESENCE of a HUGE AMOUNT of air within the cells of these blocks.

Correct answer is (a) Oval

Explanation: The Concrete Association of India RECOMMENDS that the shape of the cores in the blocks USED in concrete masonry should be oval. There should be at least TWO cores in the blocks.

Right option is (d) STONE-backed MASONRY

Explanation: Bricks and stones can be SIMULTANEOUSLY used in three forms of composite masonry – BRICK-backed ashlar masonry, brick-backed stone slab FACING and rubble-backed brick masonry. Hence, stone-backed masonry is not a form of brick stone composite masonry.

Correct answer is (d) Slumped finish

The explanation is: Slumped finish is obtained by PREPARING a concrete of the DESIRED slump. It is a rough finish. Glazed finish is used to give a shiny appearance. Colored finish is obtained by ADDING various colored pigments to the concrete mix to IMPART different colors whereas in the specially FACED finish, finishing material such as marble, is used on the facing side of the block.

Right CHOICE is (b) 1:1:6

To explain I would say: In hollow CLAY BLOCKS masonry, the load BEARING main walls should be CONSTRUCTED in 1:1:6 (cement, lime, sand). And non-load bearing main walls should be constructed in 1:2:9 mix.

The correct CHOICE is (d) Glazed finish

For explanation: Glazed finish is USED to give a very pleasing and shiny appearance to the surfaces. Hence, this type of surface finish is widely used for DECORATIVE WORKS.

Right CHOICE is (d) Quoin header

For explanation I would say: In rubble-backed BRICK masonry, each alternate course comprises of a quoin header. It is defined as a corner on the FACE side of a wall.

The CORRECT answer is (a) 1:6

Easiest explanation: While manufacturing the concrete masonry BRICKS, the CEMENT AGGREGATE ratio should not be thinner than 1:6. The aggregate should have a mixture with the proportion of fine aggregate being 60% and coarse aggregate being 40%.

Correct choice is (a) Scutch

Explanation: Scutch is a tool that is used for cutting soft BRICKS. A trowel is used for LAYING the MORTAR. A jointer is used for pointing the joints while the SPIRIT LEVEL is used for levelling.

Correct ANSWER is (d) VERTICALITY

For EXPLANATION I would say: Plumb rule is a tool that consists of a plumb line and a BOB. It is extensively used by builders and SURVEYORS for checking the verticality of the walls.

Right choice is (a) One

The explanation: In horizontal reinforcement, the number of strips of hoop iron USED for one stretcher brick is GENERALLY one. The hoop iron is placed in a uniform way THROUGHOUT the wall.

The correct option is (d) Solid BRICK block and PARTITION block

Easiest explanation: There are various blocks used in CONCRETE MASONRY. These are solid brick blocks, partition blocks, floor blocks, LINTEL blocks, corner blocks, etc. The solid brick blocks are the most commonly used blocks.

Right answer is (a) 3 N/mm^2

The EXPLANATION is: Concrete Association of INDIA recommends that the STRENGTH of the blocks used in concrete masonry should be at least 3 N/mm^2 and the recommended size of common blocks used in cement concrete masonry are 39 cm x 19 cm x 30 cm; 39 cm x 19 cm x 20 cm and 39 cm x 19 cm x 10 cm.

The correct option is (B) Brick-backed stone slab facing

The explanation is: In brick-backed ashlar masonry, alternate courses of ashlar are PRESENT. In brick-backed stone slab facing, stone marble may be USED for making stone TILES.

Correct ANSWER is (b) 83 m

Easy explanation: Exmet is a network of STEEL meshed STRIPS. Generally, the LENGTH of the COIL in which exmet is supplied is 83 m.

Right OPTION is (a) Partition BLOCK

To elaborate: Various types of structural clay UNITS of hollow BLOCKS are partition block, fixing block, load-bearing block, rug faced block, conduit block, ETC. The given figure represents a partition block.

The correct CHOICE is (c) RIGHT

For EXPLANATION I would say: Mason’s square is widely USED by builders and masons for checking right angles. It is one of the most important tools used for masonry WORK.

The CORRECT answer is (d) 50%

The best I can explain: Tiles used in hollow CLAY BLOCKS masonry may have GROOVES on their faces. While manufacturing grooved tiles, it is to be kept in mind that the area covered by the grooves should not EXCEED 50% of the area of the cored faces.

Correct OPTION is (a) 1:6

To explain: While manufacturing the concrete masonry BRICKS, the cement-aggregate RATIO should not be thinner than 1:6. The aggregate should have a mixture with the proportion of fine aggregate being 60% and COARSE aggregate being 40%.

Right choice is (b) False

To explain: In reinforced brick MASONRY, the reinforcement can be LAID both horizontally or vertically. In horizontal reinforcement, bars are placed in such a way that they go all the way through the WALL while in vertical reinforcement, vertical steel bars are placed at all the corners of the WALLS.

Correct OPTION is (b) 2 cm

For explanation: The shell of a clay BLOCK SURROUNDS the hollow interior while a web acts as a partition between the cells. The least overall average thickness of a shell should be 2 cm.

Correct option is (d) 25%

To EXPLAIN: Concrete MASONRY uses two types of cement concrete BLOCKS for the CONSTRUCTION of walls – hollow concrete block and solid concrete block. A hollow concrete block has a core-void area greater than 25% of the gross area.

Right option is (C) Exmet

To EXPLAIN I would say: STEEL meshed STRIPS that are used in horizontal reinforcement are generally cut and stretched by a MACHINE to form a diamond network. These strips are known as expanded metal or exmet.