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The correct choice is (a) 110mm

For EXPLANATION: Rat-trap BOND masonry uses bricks of size 230x110x75mm.In this masonry, bricksare laid on edges, making the course height to be 110mm. Laying of bricks creates a CAVITY wall AUTOMATICALLY.

The CORRECT answer is (c) Pre-Stressed CONCRETE

Explanation: Pre-Stressed Concrete REFERS to the block of concrete which has been subjected to compression prior to SUPPORTING any LOADS.

Correct answer is (d) Damp Proof Membrane

To elaborate: DPM is a membrane material APPLIED to PREVENT dampness. It can be used for a DPC (Damp Proof COURSE). An EXAMPLE is laying a polyethylene sheet under concrete slabs.

Correct OPTION is (b) Base coat

For EXPLANATION I would say: FLOORING refers to the covering of FLOOR. Before laying any covering material, a base coat has to be provided. Cement concrete ratio of 1:8:16 of 100mm thick or COMPACTED earth of ratio 1:4:8 can be used.

The correct ANSWER is (B) 3 inches

The explanation is: PITCH is the distance between two crests in a corrugated sheet. In corrugated galvanized Iron (CGI) sheets, pitch can RANGE from 1-5 inches. Commonly produced one these days is 3 inch one.

The correct choice is (d) 3

Best explanation: In MADRAS terrace roof, FIRSTLY wooden JOISTS are placed over steel joists or walls. Then, a course of well burnt bricks is placed in the lime MORTAR, followed by a layer of brick bat concrete. Then 3 layers of flat tiles in the lime mortar (1:2) is provided and the roof is finished with 3 coats of PLASTER.

The correct CHOICE is (a) Prismatic

To explain: Folded plate ROOFS may be DEFINED as slabs with folds. These folds reduce bending moment and shear force CONSIDERABLY. Cylindrical, CORRUGATED shell and Ellipsoidal are types of shell roofs.

Right answer is (a) s

For explanation: The time is TESTED is Vee-Bee test. Time REQUIRED to complete remoulding of CONCRETE when SUBJECTED to the vibration is measured. It is then expressed in seconds.

The CORRECT answer is (a) Increases

Explanation: It increases with increase in age.The STRENGTH measured after days, months and years shows an increase. It takes 28 days for CONCRETE to attain full strength.However, it CONTINUES to attain strength even after 28 days.

The correct option is (a) Rubber pieces

The best I can EXPLAIN: In R.C.C SLABS, concrete in the lower portion does not HELP in anyway because it is weak in tension (bottom zone). Therefore, in filler slabs, it is replaced by certain filler materials, like coconut SHELLS, burnt clary bricks, pots etc.

Right answer is (d) Heavy wind

Explanation: The FIRST three options are the reasons for leaks in FLAT roofs. Weather effects like heavy wind, storm, rain can alter the ROOF structure and CAUSE leakage.

Right answer is (b) HVAC

Best EXPLANATION: HVAC stands for heating VENTILATION and air-conditioning.This system is INSTALLED in BUILDINGS to give all the comforts to the OCCUPANTS via a single unit.

The CORRECT ANSWER is (d) 600^oC

Explanation: CONCRETE decomposes when exposed to heat. WATER evaporates, sand, gravel become molten lava LIKE. Up to 200^oC, no changes are noticed. At about 600^oC, significant lossoccurs. At 800-1000oC, it completely gives in.

The correct choice is (a) WATER proofing roofs

The best EXPLANATION: It refers to the application of a special liquid coating to any type of roofs. The coating then cures and forms a rubber LIKE water proof membrane. It is COST effective, safe, easy to apply and highly RELIABLE.

Right ANSWER is (c) Pans

Easy EXPLANATION: In small works, less QUANTITY of concrete is required. So, workers carry it in a pan ATOP their heads. Conveyer belts and pumps are used for large construction works.

Correct option is (d) Aluminous CEMENT

The BEST I can explain: This mortar is prepared by adding one part of aluminous cement to 2 parts of powder of FIRE bricks. It can be USED to line furnaces, ovens, fire places, ETC.

Correct choice is (a) Over-reinforced

To elaborate: Over-reinforced BEAMS have HIGHER TENSION capacity. So, these beams FAIL by crushing of compression zone concrete, WITHOUT any warning.

Right option is (b) TENSIONING

To EXPLAIN I would say: Tendons can be a single wire, mesh, threaded BARS made from high tensile steels.The pre-stressing is done by tensioning tendons.

The correct choice is (a) True

To EXPLAIN I would say: Although semi RIGID and rigid MATERIALS can be used, FLEXIBLE materials are the best. These do not tend to crack or puncture under differential thermal movements, between the material of roof and parapet.

Correct ANSWER is (d) Undercoat, 10-15

Easy explanation: PLASTERING can EITHER be DONE in single, 2 or 3 coats. The 1^st coat is undercoat of thickness of 10-15mm. 2^nd coat is floating coat of 6-9mm thickness. The last coat is the FINISHING coat of 2-3mm thickness.

Correct choice is (B) 5

For explanation: These stairs are used in places where durable and hard stones are available locally. The five types are rectangular, spandril, TREAD and RISER, CANTILEVERED tread and built up STEPS.

The correct answer is (c) Sub FLOOR

To explain I would say: Flooring refers to the floor FINISH or covering LIKE tiles, MOSAIC, etc. The level below these is called sub floor.

Correct answer is (d) 25-30m/min

To explain I would SAY: Escalators are electronically moving stairs. They can carry heavy TRAFFIC of PEOPLE. The SPEED is KEPT at a minimal of 25-30m/min so that people of all age groups can access it.

The correct answer is (c) 4:1

Explanation: The FINISHING coat PRIMARILY consists of COW dung and cement mixed together. They are taken in 4:1 RATIO, that is 4 parts cow dung to 1 part cement.

Right choice is (c) Rectangular

To elaborate: There can be different shapes of wood shingles and shakes. They can be tapered, STRAIGHT, split or SAWN and any two of the above can be combined, EXCEPT straight-tapered. Rectangular shingles of 14cm length is the simplest form.

Correct option is (b) False

Explanation: Straw thatch and reed thatch are both used after dipping them in FIRE resistant solutions. Straw thatch is more LIKELY to CATCH fire, absorb more moisture than reed thatch. Straw thatch can LAST for 20-25 years while reed thatch can last for 50-60 years.

Right OPTION is (a) Rotating

The explanation: Rotating or REVOLVING door has several WINGS which are hinged at the middle. It opens in both directions and ALLOWS more number of PEOPLE through it.

The correct choice is (d) GROUTING DEEP oil wells

Explanation: Retarders are USED to slow down the initial rate of hydration and extend the initial setting time. It is therefore used to GROUT deep oil wells, transport RMC (Ready Made Concrete) and avoid cold joints. Accelerator is used for first 3 options.

The correct choice is (c) 22 kN/m^3 and above

To ELABORATE: X-ray shielding mortar is prepared USING heavy ROCKS and suitable admixtures. It’s aheavy mortar with bulk density above 22 kN/m^3.It is used in plastering coats to WALLS and ceiling of X-ray cabinets.

Right choice is (d) Toothing

Easy EXPLANATION: The place where the main and cross wall JOINS, there can be cracks developed. It is due to poor bonding between walls. Bonding can be INCREASED by toothing, where a projection of brick is done into the other wall, INTERLOCKING it.

The CORRECT OPTION is (d) Bottom

For explanation I would say: In the R.C.C. structure, there is a neutral axis in the middle, where no COMPRESSION and TENSION is there. Layers above it are SUBJECTED to compression and the ones below it is subjected to tension.

The correct answer is (a) 2

To elaborate: Reinforced cement concrete can be of TWO types.It can EITHER be pre-cast or be casted in-situ.

Correct option is (a) ROUGH

To explain I would SAY: All the MORTAR joints and the brick SURFACE has to be slightly scraped so as to obtain a rough surface. PLASTERING will be able to bond better on to a rough surface.

Right CHOICE is (a) Winder

To explain: L shaped stairs have a bend, at 90o usually. The bend is ACHIEVED by adding a flat landing at the bend transition POINT. In winder stairs, instead of a flat landing, TRIANGLE steps are provided.

The correct OPTION is (d) Nightingale

Easy EXPLANATION: These FLOORS make a chirping sound when the TREAD on.The sound is produced by the rubbing of nails against the boards of flooring.

The correct OPTION is (b) Single joist timber floor

Best EXPLANATION: In residential buildings, the span is less and LOADS to be CARRIED are light. So, a single joist timber can be used.

Correct ANSWER is (d) LOCK rail

The BEST I can explain: The middle portion where the provisions for a lock are generally GIVEN. Hence it is CALLED lock rail.

Right OPTION is (d) Size of window OPENING 1000x1300mm

To elaborate: This representation is the way to DESIGNATE a window. W stands for window and T for double shutter. The letter S is used to INDICATE a single shutter.

Right choice is (c) Plastic

Easiest explanation: While the CONCRETE is still plastic, the accumulated water due to BLEEDING can be USED to mix concrete again and improve workability. It ALSO benefits by further reducing water-cement ratio.

The correct CHOICE is (C) Creep

Easiest explanation: Concrete shrinks with age.The changes in dimension are called creep.It is determined using creep COEFFICIENT which is the ratio of ULTIMATE creep strain to elastic strain at the age of LOADING.