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The correct option is (a) ASPHALT

For EXPLANATION I would say: The Asphalt tiles, which are produced from NATURAL Asphalt, bitumen, asbestos fibre and material pigments are available in different sizes and in a variety of colours. The asphalt Terrazo is formed by combination of Black Or COLOURED asphalt with marble chips.

Right OPTION is (c) BRICK

The explanation: The BRICKS are laid on the floor and brick work is carried out in cement or lime MORTAR. To get a better finish, the joints are pointed. The only drawback of this flooring is that it absorbs WATER.

Right ANSWER is (b) Cement, LIME

For explanation I would say: In BRICK jack arch flooring, joists are encased in cement mortar, for preventing their rusting from the lime mortar. In this type of flooring, only well-burnt bricks should be used for construction and they are saturated with water before USING them.

The correct answer is (d) PLASTIC FLOORING

For explanation: Plastic flooring consists of tiles made of PVC which stands for Poly-Vinyl-Chloride. This type of flooring is smooth and has a good appearance. HOWEVER, it can be EASILY damaged by bringing burning objects in contact.

The correct OPTION is (c) RCC

To EXPLAIN: RCC floor is widely used in Modern construction. The slab and beam design as per loading coming on the floor and PROPER Reinforcement is PLACED at a suitable place.

The correct option is (a) Double flagstones floors

The best explanation: In Double flagstones floors, the STEEL BEAMS are placed at a distance of about 3 meters Centre to centre and the joist are placed at right angles to the BEANS. The Flagstones of about 14 mm thickness and of suitable width are fixed on the LOWER flanges and upper flanges.

The correct choice is (d) 3 m

The BEST explanation: In RIBBED flooring, lateral ribs having the same width as that of longitudinal ribs are provided if the span EXCEEDS 3 m. These are provided at INTERVALS between 1-3 m.

The correct choice is (d) Any CLASS of bricks can be USED

The explanation is: Proper PRECAUTIONS must be taken while constructing brick jack arch floors. These are – KEY brick should be properly secured in the mortar, R.S.J should be properly secured in POSITION and only first class bricks should be used.

Right choice is (c) Curved slab flooring

The best EXPLANATION: There are various TYPES of R.C.C. floors. These are simple slab flooring, REINFORCED slab flooring, FLAT slab flooring, beam slab flooring and ribbed flooring.

Correct CHOICE is (c) 1:5/4 to 1:2

Explanation: Terrazzo is a specially PREPARED CONCRETE surface. The ratio of CEMENT and marble in terrazzo is 1:5/4 to 1:2. The cement may be white or grey. However, colour can be added to the white cement in ORDER to set the desired tint.

Correct choice is (c) 2-4 cm

Explanation: Flagstone is a laminated sandstone of thickness 2-4 cm AVAILABLE in the form of STONE slabs. These stone slabs can be SQUARES of SIZE 30 cm x 30 cm, 45 cm x 45 cm or 60 cm x 60 cm or they can be rectangular of size 45 cm x 60 cm.

The CORRECT choice is (b) False

For EXPLANATION I would say: Mud and muram floorings are cheap and easy to construct. They are used only in low-cost housing. They have good thermal insulation PROPERTY which helps them to remain COOL in summer and sufficiently warm in winter.

Right option is (B) Filler JOIST

To EXPLAIN: The above figure shows a filler joist floor. In this figure, A represents flooring, B represents filler joist and C represents concrete fill. In this TYPE of flooring, the filler joists EITHER rest on walls or on longitudinal steel beams.

Right answer is (c) Linseed

Easiest EXPLANATION: Granules of cork are HEATED with linseed oil to manufacture cork carpet. Cork TILES are available in different SIZES, thicknesses and shades. The thickness GENERALLY varies from 5 to 15 m.

The correct option is (a) 1.8-2 m

The best I can explain: In timber flooring, the SPACING between the sleeper walls is not more than 1.8-2 m. Timber flooring is extensively USED in carpentry halls and auditoriums. It is also used in hilly areas where timber is CHEAP and READILY AVAILABLE.

Right answer is (B) Void

Easiest explanation: In the given figure, A represents a void and B represents sleeper wall. VOIDS are PROVIDED in sleeper walls in order to keep the HOLLOW space between the flooring and oversite concrete dry. Air bricks in the outer walls can also be provided to keep this space well-ventilated.

The correct ANSWER is (c) 1.5

To EXPLAIN: In simple reinforced cement concrete slab flooring, it is important to provide REINFORCEMENT in both the directions when the LENGTH of the room is 1.5 times its width. This is because in this case, the slab bends in both the directions and such a slab is called two-way reinforced slab.

Correct answer is (b) Quercus suber

Easiest explanation: Cork used in cork flooring is obtained from the bark of Quercus suber. It is the OUTER bark of cork OAK tree which is used to make cork carpets and cork TILES. Cork flooring is completely free from noise and is used in LIBRARIES and theatres.

Correct answer is (c) Alcohol and ASBESTOS

The best explanation: In asphalt mastic flooring, MINERAL oil and asbestos should be added to asphalt mix in order to apply it cold. The mix is LAID on the cement concrete base course and is spread with the help of a trowel to obtain a levelled surface.

The correct answer is (a) Mud

Easy explanation: The MOIST selected Earth is evenly spread out and it is rammed well so as to get a consolidated thickness of about 150 MM. The water is not ADDED during the process of RAMMING and small quantity of straw may be added to the moist earth before Ramming to avoid the formation of cracks on drying.

The CORRECT ANSWER is (d) T-beams

Explanation: The beams used in beam-slab flooring are KNOWN as T-beams. In this TYPE of flooring, the floor is comprised of R.C.C. beams and slabs cast monolithically. Beams serve as intermediate supports to the slab that is continuous over these beams.

Correct choice is (b) 1:3

Explanation: In flagstone FLOORING, while laying the slabs a string is stretched between two CORNER slabs. Other slabs are then laid in such a way that their TOPS touch this string. If a particular slab falls below the string level, then it is re-laid with the help of a fresh layer of mortar. The mortar used in flagstone flooring has cement and SAND in the ratio 1:3.

Right option is (a) HOLLOW block

Easy explanation: In one form, the blocks are placed 100 mm apart and in this space, the mild steel bars are placed. A minimum cover of 80 mm is kept at the top. Suitable flooring at top and ceiling FINISH are PROVIDED.

Right answer is (a) Depth = (4 x spanning metres) + 5 cm

To explain I would SAY: In single joist timber floors, the depth of the JOISTS is calculated using the formula – Depth = (4 x spanning metres) + 5 cm. Single joist timber floors are the simplest type of timber floors which are widely used for residential BUILDINGS.

Right answer is (a) 35 MM

Explanation: Granolithic finish is composed of RICH concrete made with a very tough quality coarse AGGREGATE like basalt, granite etc. The MINIMUM thickness of the granolithic finish, when laid over a hardened SURFACE is 35 mm while when laid monolithically with the top concrete, it is 25 mm.

The correct option is (b) L/20

Explanation: In ribbed FLOORING, the depth of the rib is at least L/20 with the free support. HOWEVER, it is at least L/25 with FIXED support. Here, L stands for the span of the ribs.

The correct choice is (c) Triple Joist timber floor

Explanation: The Triple Joist timber floor consists of GIRDERS, binders, a bridging JOISTS and floor boards. The girders are generally placed at a CENTRE to Centre DISTANCE of 3 METERS. The binders are staggered and connected to the girders by tusk and tenon joints.