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Right answer is (d) Basement timber floors

Easy explanation: In Basement or ground floor of timber, the SLEEPERS walls which may be ONE half Brick or one brick THICKNESS are constructed at centre to Centre distance of 1.20 metre to 1.80 metre. The wall plates are PROVIDED along the wall as WELL as along the sleeper walls and they reduce the span of the bridging joist.

The correct option is (c) Flooring

To explain: The ground floor or basement FLOORS with DIRECTLY rest on the ground do not require the provision of a floor. But they are PROVIDED with a SUITABLE TYPE of floor covering or simply flooring.

Correct answer is (c) MAGNESITE

To EXPLAIN I would say: Magnesite Flooring material can be laid over stone, concrete or WOODEN floors. A coating of bituminous PAINT should be provided on the metal surface coming in contact with this flooring material. This flooring material is CHEAP and it can be laid over rough surfaces.

Right choice is (b) Double joists timber floor

For explanation I would say: The BINDERS are generally placed at the centre to Centre DISTANCE of 1.8 METRE to 2.4 meters. The ends of Binder rest on the wooden or STONE blocks. The double JOIST Timber floor are stronger than the single joist Timber floor.

Correct answer is (b) Plastic

For explanation I would say: The PVC tile FLOORING is resilient, smooth and good looking. It can be easily CLEAN. It is however costly and can be easily damaged when it COMES in contact with burning objects. The PVC tiles are usually not laid on the wooden floor as the COST of preparing the surface to RECEIVE these types are considerably high.

The CORRECT answer is (b) BRIDGING JOISTS

The EXPLANATION: Wooden joists provided in single joist timber FLOORS are called bridging joists. the spacing between these joists is usually 30-40 cm and their width is generally kept 5-8 cm.

The correct answer is (B) Reinforced cement CONCRETE

For explanation I would say: Reinforced cement concrete is the full form of R.C.C. It is EXTENSIVELY used for the CONSTRUCTION of floors of modern buildings. R.C.C. floors are relatively fireproof and damp proof and have MANY other advantages over other types of floors.

Right option is (d) 2:1

For EXPLANATION: Asphalt mastic has sand and asphalt in the RATIO 2:1. It is mixed HOT and then laid in continuous sheets. The thickness of asphalt mastic for ordinary construction is GENERALLY 2.5 cm.

Correct ANSWER is (C) Tiled flooring

To explain I would say: Tiled flooring is used as an alternative to terrazzo flooring when the floor needs to be laid quickly. It is constructed from square or hexagonal shapes made of cement CONCRETE, CLAY or terrazzo. It is COMMONLY used in schools, offices, hospitals etc.

Correct option is (C) Hollow-tiled floors

Easy explanation: Ribbed floors are also known as hollow-tiled floors. In this type of flooring, hollow tiles replace the lower part of the slab SINCE CONCRETE cannot bear the TENSION caused in the lower part of the slab. The use of hollow tiles also REDUCES the weight of the slab.

Correct CHOICE is (B) 3-6 mm

To explain I would say: The size of the marble chips used in TERRAZZO flooring varies from 3-6 mm. Marble chips of DIFFERENT colors are used. They are exposed by grinding operation once the SURFACE has set. Terrazzo flooring is comparatively more expensive.

Right choice is (c) Nominal

The best I can explain: Nominal reinforcement is KNOWN as temperature reinforcement. It is ALSO known as distribution reinforcement. In simple reinforced cement concrete FLOORING, nominal reinforcement is provided in a perpendicular DIRECTION.

The CORRECT choice is (c) Jack arch

Easiest explanation: In Jack arch floors, the joists in turn raised either on wall around BEAM. The joists are placed at a distance of about 800 MM to 1200 mm Centre to centre. The rise of arches should be 100 mm to 200 mm and the minimum depth of concrete at the Crown should be 150 mm.

Right option is (C) Rolled steel joists

Explanation: The FULL form of R.S.J is rolled steel joists. The cross-section of an R.S.J. beam is USUALLY I or H shaped. It is GENERALLY made of mild steel but ALUMINIUM and some other materials can also be used.

The CORRECT option is (c) SEPARATING joists

The explanation is: There are four elements of TRIPLE joists timber FLOORING. These are floorboards, bridging joists, girders and binders. Triple joists timber floors are also known as framed floors. This type of flooring is USED for spans exceeding 7.5 m.

Right choice is (a) They are heavy

To EXPLAIN: Hollow-tiled FLOORS are LIGHT in weight. They provide GOOD thermal INSULATION, sound insulation and are fire-resistant.

Right ANSWER is (a) 1:2:4

The explanation is: Arch in cement concrete jack flooring is made of 1:2:4 cement concrete. The arches are supported on the LOWER flanges of MILD steel joists. The method of construction of cement concrete jack FLOORS is COMPARATIVELY easy.

The correct option is (d) 1/12

The best EXPLANATION: In jack ARCH FLOORS, the rise of the arch is equal to 1/12 of the span. Jack arch is an arch made of either concrete or brick. In this, the SPACING between the joists is 1-1.5 m PLACED center to center.

Right choice is (a) TWO

Easiest explanation: The floor in cement concrete flooring CONSISTS of two components. These are base concrete and topping SURFACE. The topping surface is also KNOWN as the wearing surface. The two components of the floor can be constructed in two ways – monolithically or non-monolithically.

Correct option is (b) 15 CM

The best I can explain: In muram flooring, the thickness of the layer of muram laid over the prepared subgrade is 15 cm. Over this layer, a layer of FINE muram of thickness 2.5 cm is spread and sprinkled with water. After it, the surface is rammed well. The method of CONSTRUCTION of muram flooring is very easy.

Right ANSWER is (b) UPPER floor

Explanation: The major problems of ground and basement floors are damp exclusion and the thermal insulation. The moisture is generally present in the ground and UNLESS SUITABLE measures are taken to prevent its entry, it will pass into the building through floors.

Correct answer is (B) Rubber

The best explanation: Rubber Flooring can be LAID over any smooth and dry surface. This flooring material is elastic, ATTRACTIVE in appearance, sanitary, comparatively WARM and soft, but it is affected by oil and GREASE. This flooring material is used for bathrooms, hospitals, etc.

The correct choice is (a) CEMENT

To explain I would say: Cement MORTAR is used to fill the joints in precast concrete floors. Concrete GUNS are used for this purpose. The floors can be CONSTRUCTED very easily with the help of precast beam-slabs. These are generally available in 25 cm width.

Correct answer is (c) 15 CM

Easy explanation: The minimum depth of concrete at the CROWN in jack arch floors is 15 cm. In this type of floors, steel ties RODS are also PROVIDED at the end span generally spaced at 1.8-2.4 m c/c. These are provided because of the tension DEVELOPED at the end span.

Correct option is (b) 3 MM

Best explanation: The thickness of the mild steel PLATES provided in the centring of CEMENT concrete jack floors is 3 mm. The centring has a pair of holes at the ends which are spaced at 75 cm c/c. The steel PLATE is bent in the SHAPE of the arch soffit.

The CORRECT answer is (c) Marble flooring

Best explanation: Marble flooring is used in bathrooms and kitchens. It is ALSO used in those places where EXTRA cleanliness is REQUIRED. Marble slabs are available in different sizes. They are GENERALLY of square or rectangular shapes.

The correct answer is (d) Glass flooring

Explanation: Glass flooring is used when it is required to transmit light from the UPPER to lower floor. This type of flooring is very COSTLY. Glass is available in the form of slabs or TILES whose thickness varies from 12-30 MM.

Right choice is (a) Spandril

The BEST explanation: The curved-triangular SPACE formed between the outer CURVE of an arch and a horizontal line through the crown is KNOWN as SPANDREL. The outer curve of the arch is known as extrados.

Right option is (c) Above the GROUND

To EXPLAIN: There are TWO types of timber FLOORS. These are SUSPENDED type and solid type. Suspended type timber floors are supported above the ground while solid type timber floors are fully supported on the ground.

Correct option is (b) False

Easy explanation: DAMP prevention in timber flooring can be prevented by providing a DPC LAYER below the flooring. This is ONE of the MAJOR problems faced in timber flooring. Another problem faced with timber flooring is its high COST. Because of its high cost, generally, it is not used in residential buildings in India.

Right ANSWER is (b) Terrazzo FLOORING

For explanation: Terrazzo flooring is a DECORATIVE flooring. It has good WEARING property. Because of this, it is extensively used in residential buildings, offices, hospitals and other PUBLIC buildings. It is laid in thin layers over the concrete topping.

Correct OPTION is (a) First class BRICKS

Easy explanation: Bricks are classified into 3 types – first class bricks, second class bricks and third class bricks. Only first class bricks should be used in the construction of reinforced brick flooring. The size of the first class bricks is 19 CM x 9 cm x 9 cm.

Right answer is (a) WIDTH

Easiest explanation: In STEEL joist and STONE floors, the clear span of the joists is equal to the width of the room. LENGTH of available stone slabs is a factor on which the spacing of the rolled steel joists depends.

The correct ANSWER is (a) Cotton FIBRE

To EXPLAIN: In rubber FLOORING, tiles of rubber are manufactured by mixing pure rubber with fillers like cotton fibre. Granulated cork or asbestos fibre may also be used. Rubber FLOORINGS are noise proof but costly.

The correct option is (d) Filler joists

To EXPLAIN I WOULD say: The joists may be either rest onwall or on Steel beam. The joists act as reinforcement and are SPACED at a centre to Centre distance of 600 MM to 900 mm.

Correct answer is (c) 12 MM

Easy EXPLANATION: Brick flooring is used in cheap construction, especially in those places where good bricks are available. The METHOD of PREPARING the base course varies from place to place. The thickness of the mortar bed on which the brick flooring is laid is 12 mm.

Correct answer is (a) Linoleum

Best explanation: The Linoleum should be laid over an effective damp PROOF COURSE. The linoleum flooring is attractive in appearance, cheap, durable, resilient, comfortable, moderately warm and it can be easily clean. It reduces nose to a considerable extend and is USED for residential buildings, RESTAURANTS, RAILWAY, public transport buses, etc.

Correct answer is (C) Glass

The explanation is: The structural glass is available in the form of tiles or SLABS or bricks and it can be placed in suitable FRAMEWORK so that the FRAME and the glass can sustain the anticipated loads.