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Right option is (b) Third

Easiest EXPLANATION: In REINFORCED brick PARTITIONS, reinforcement consists of steel MESHED strips which are known as exmet or expanded metal. It is provided at every third course of the reinforcement.

Correct choice is (B) False

To explain: Timber is classified into TYPES with respect to fire-resistance. These are refarctory and non-refractory. Refractory timber does not catch fire READILY while non-refractory timber catches fire readily.

Right CHOICE is (d) Inter-tie

To elaborate: In TRUSSED PARTITIONS, additional member provided between the head and sill is KNOWN as inter-tie. It is used to impart strength and rigidity. Exmet and bricktor are FORMS of reinforcements used in reinforced brick partitions. Nogging is a horizontal member of the timber framework.

The correct choice is (c) Bricktor

For EXPLANATION: In brick nogging partitions, a TIMBER FRAMEWORK is used. The COMPONENTS of this framework are sill, HEAD, stud and noggings. Bricktor is a type of meshed reinforcement.

Correct answer is (b) 4-6

The best explanation: In the FRAMEWORK of brick nogging partitions, studs are spaced at 4-6 times the length of the brick. The framework IMPARTS STABILITY to the partitions against LATERAL loads. The BRICKS are generally laid flat.

Right CHOICE is (a) Half

The best EXPLANATION: PLAIN brick PARTITIONS are generally half brick THICK. In plain brick partitions, the wall is plastered on both its sides and is quite strong.

Correct CHOICE is (a) Dilute solution of SODIUM silicate

Explanation: Dilute solution of sodium silicate is used in the COATING of the timber surface in SIR Abel’s process. This is a method that is adopted to make timber more fire-resistant.

Correct choice is (d) 25 CM

To elaborate: Hollow glass blocks are units of glass which are light in weight. They are available in various sizes and shapes. Reinforcement is placed in EVERY course of hollow blocks used in glass partitions if the height of the BLOCK EXCEEDS 25 cm. However, for blocks up to 15 cm in height, reinforcement is placed in every third or FOURTH course.

The correct answer is (b) Diagonal GRAIN

Explanation: Diagonal grain is an example of a defect OCCURING in timber due to conversion i.e. during the conversion of timber to commercial FORM. Blue stain, sap strain and white rot are EXAMPLES of DEFECTS caused in timber due to attack by fungi.

The CORRECT choice is (b) 10 cm

For EXPLANATION: Thickness of HALF brick is 10 cm. In all the types of brick partitions, the thickness of the WALL is kept half brick thick i.e. 10 cm thick.

Correct answer is (c) Puncheon

The best EXPLANATION: In stud partitions, there are vertical MEMBERS called studs and horizontal members called noggings. A stud of short length is known as puncheon. It is usually PROVIDED on an OPENING.

The correct CHOICE is (B) Corrugated SHEET

Explanation: The given figure represents an asbestos CEMENT slab used in asbestos sheet PARTITIONS. Here, A represents a plain sheet, B represents corrugated sheet and C represents cement mortar.

Correct choice is (c) They are fire resistant

The explanation: Wooden PARTITIONS are light in WEIGHT. However, they are COSTLIER. Wooden partitions are not resistant to fire. They can be EASILY decayed and are likely to get attacked by termites.

Right answer is (b) REDUCE its weight

The best explanation: Sawdust is added to GYPSUM used in making plaster slab in order to reduce its weight. INSTEAD of sawdust, other fibrous material may be used. Plaster SLABS are GOOD insulators of heat and sound.

Correct option is (d) Plaster SLAB partitions

To elaborate: Plaster slab partitions are MADE from burnt gypsum. Plaster of Paris can also be used instead of burnt gypsum. METAL lath partitions consist of channels with metal lath on one of their ends. Clay block partitions use clay blocks, either solid or hollow. Asbestos sheet partitions use asbestos sheets.

The correct option is (b) False

To EXPLAIN: REINFORCED brick partitions are MUCH stronger than the ordinary brick partitions. Hence, they are used when the partition wall has to CARRY and support self-imposed LOADS in addition to its own weight.

The correct CHOICE is (a) 10 cm x 75 MM

Easiest explanation: The upper horizontal MEMBER in the framework of stud partitions is called HEAD and the lower horizontal member is called sill. The dimensions of the head and sill are 10 cm x 75 mm.

The correct CHOICE is (d) Brick CONCRETE partitions

For EXPLANATION: Brick partitions are the CHEAPEST type of partitions which makes them very common. There are three types of brick partitions. These are plain brick partitions, reinforced brick partitions, and brick nogging partitions.

Correct OPTION is (a) Trussed

Best explanation: There are TWO TYPES of WOODEN partitions. These are common or stud partitions and braced partitions. Braced partitions are also called trussed partitions.

Right answer is (a) COAL TAR

The BEST explanation: In brick nogging partitions, coal tar is used for coating the surface of the timber framework COMING in contact with the brickwork. Cement mortar (1:3) is used to FILL the joints.

The CORRECT answer is (b) Arsenic SULPHATE

The best I can explain: Ascu is a preservative that is USED for the preservation of timber in order to prevent the timber from decaying. It CONTAINS arsenic pentoxide, copper sulphate and potassium dichromate. Ascu is available in POWDER form.

Correct choice is (a) BRACES

Easy EXPLANATION: Inclined members provided in the FRAMEWORK of trussed PARTITIONS are known as braces. Its framework is quite SIMILAR to the framework of stud partitions but braces and steel bolts are additionally used.

Right answer is (c) Calcium CARBONATE

To explain: WHITING chalk is made up of calcium carbonate. It is an ingredient used in MAKING putty which is further used to secure glass SHEETS in sashes.

The correct option is (b) They are USED when a BETTER lateral bond is needed

To explain I WOULD SAY: In reinforced brick partitions, the thickness of the wall is kept equal to 10 cm. They are used when a better longitudinal bond is needed and when the partition has to SUPPORT super-imposed loads.

Right CHOICE is (b) False

Explanation: In asbestos SHEET partitions, asbestos SHEETS are fixed to a suitable wood framework to serve as a PARTITION wall. Asbestos sheet partitions are lightweight and quite strong.

Right answer is (B) M 15

For explanation: In concrete partitions, concrete mix adopted for precast slab UNITS is USUALLY M 15. In M 15, M denotes Mix and 15 is the CHARACTERISTIC compressive strength of concrete cube at 28 days in N/mm^2.

The CORRECT OPTION is (c) 10 CM

Easiest explanation: HOLLOW blocks used in glass partitions have a thickness of 10 cm. They are usually square in shape with DIMENSIONS being either 14 x 14 cm or 19 x 19 cm.

The correct option is (a) 80-100 mm

To explain: The THICKNESS of cast-in-situ concrete PARTITIONS is generally 80-100 mm. They are rigid and stable. HOWEVER, they REQUIRE large costs for their CONSTRUCTION.

The correct answer is (b) A PARTITION wall should be fire resistant

The explanation: Some of the requirements that must be filled by partition walls are they should be LIGHT and THIN. They must ACT as a sound barrier. They should be fire resistant and strong enough to carry their own load.

Correct answer is (b) Sound insulation

To EXPLAIN I WOULD SAY: Sound insulation is an important requirement in the DESIGN of internal walls. An internal wall is a load-bearing partition wall. STRENGTH is also an important factor in the design of internal walls.

The correct answer is (b) Good conductor of heat

The best I can explain: For the CONSTRUCTION of CLAY block partition WALLS, HOLLOW clay blocks may be used. They are good insulators of heat and sound. They are also fire-resistant.

Right answer is (c) Light and thin

The best explanation: A PARTITION WALL should be as light and as thin as possible. LIGHTER the partitions, the lighter will be the structural elements. This will RESULT in a better economy of the building.

Correct ANSWER is (C) Studs

Easy explanation: In metal LATH partitions, channels are placed vertically which are CALLED studs. They can be 2 cm or 2.5 cm in length. Metal lath is FIXED to it on one of its sides.

Correct CHOICE is (a) Half

The BEST explanation: In a brick cavity WALL, the inner and outer leaf is half brick THICK. However, if the superimposed loads are very heavy, then the thickness of the inner leaf is increased in the multiple of half brick thickness.

Right answer is (c) Linseed oil

To explain: Putty is a cementing material which is used to KEEP GLASS SHEETS in position while CONSTRUCTING glass SHEET partition walls. Putty is made up of linseed oil and whiting chalk.

Correct answer is (C) Cement mortar (1:3)

Easy explanation: In PRECAST concrete PARTITIONS, generally, cement mortar (1:3) is used for jointing. Precast T-shaped or L-shaped UNITS are used for concrete partitions and a lightweight PARTITION is obtained.

Right option is (C) Gum partitions

Explanation: A partition wall is a TYPE of wall which is used to divide the SPACE within the building. It is of the following types – brick partitions, glass partitions, concrete partitions, metal lath partitions, plaster slab partitions, TIMBER partitions, etc.

Correct choice is (b) False

To elaborate: Cavity walls are USUALLY the OUTER walls of the building because they are CONSTRUCTED for providing thermal and sound insulation to the buildings. They also prevent the moisture from ENTERING the building and hence prevent the FORMATION of cracks in the building.

Correct choice is (b) Heavy

The explanation: In glass SHEET PARTITIONS, glass sheets are fixed in a wooden FRAMEWORK. Glass sheet partition walls are LIGHT in weight. They are sound-proof and damp-proof.