Explore topic-wise InterviewSolutions in .

Right answer is (c) Spatter dash finish

For explanation: Rough CAST finish is also known as spatter dash finish. This type of finish is waterproof and DURABLE. It is also RESISTANT to CRACKING and crazing.

Correct option is (b) Conical

The best I can explain: Popping is the formation of a conical HOLE in the PLASTERED surface. It is DUE to the presence of some particles which on SETTING result in EXPANSION.

Right answer is (b) Finishing coat

For EXPLANATION I would say: The FINAL coat of the PLASTER APPLIED to the WALLS and ceilings is called the finishing coat. This coat is also called skimming coat or setting coat. Painting cannot be done until the finishing coat is applied.

The CORRECT choice is (d) Hump

The best I can explain: The quantity of Hump is about 10 Newton PER metre cube of mortar. The mortar thus prepared is kept for two days before use and it is TURNED once in a day to MAKE the mortar of uniform nature.

Right option is (c) Gugal

Best explanation: The QUANTITY of Gugal is about 16 Newton PER METRE cube of Mortar. The Gugal is boiled with enough quantity of fresh water before it is MIXED with the LIME mortar.

The correct choice is (B) Lime Mortar

Best explanation: Lime and sand are carefully ground in MOTOR MILL. The sand to be used for preparing the lime mortar should be clean, FINE and free from any organic impurities.

Correct answer is (c) 10 cm X 30 cm

The explanation: The blade size of a METAL FLOAT is generally 10 cm x 30 cm. However, the size of a wooden float varies from 10 cm x 30 cm to 11 cm x 33 cm.

Correct option is (a) Gypsum PLASTER

To explain: Hence, Gypsum plaster is used as an INSULATING material to protect wood or metal COLUMNS and beams from high temperatures. It is light in weight.To DECREASE the weight, the fillers such as saw dust, wood shaving, ETC. may be added to it.

Correct answer is (B) Flaking

For explanation: The Flaking is mainly due to Bond FAILURE between successive COATS of plaster. UNEVEN surfaces becomes prominent only due to poor workmanship of the WORK.

Correct choice is (a) Water proof

To EXPLAIN I would say: Water proof mortar is waterproof and it is PREPARED by mixing one part of cement, two PARTS of sand and pulverized alum at the RATE of 120 Newton per metre cube of sand. In the water to be used to, 0.75 Newton of soft soap is dissolved for one LITRE of water and this soap water is added to the dry mix.

The correct CHOICE is (b) 10-20 mm

For explanation: In pebble dash, the size of pebbles used generally varies from 10-20 mm. These pebbles are dashed against the surface in order to keep them in POSITION. The pebbles may ALSO be lightly pressed in the mortar by using a wooden FLOAT.

Right choice is (b) 8 mm

Easiest explanation: In SAND faced finish, the thickness of the FIRST coat is 12 mm while the thickness of the second coat is 8 mm. The sand in the mortar mix for the second coat should be perfectly screened in ORDER to obtain a uniform size resulting in the surface having sand GRAINS of uniform density.

The correct answer is (a) Plastering

Easy explanation: The EXPOSED SURFACES of walls are to be provided with POINTING or plastering. The PROCESS of pointing is adopted for the STONE masonry or brick masonry while plastering is carried out for exposed surfaces of ceilings, walls, columns, etc. The plastering removes the unevenness of the surface and sometimes the plastering is used to develop decorative effects.

Right answer is (c) Pointing

Explanation: It is desirable to avoid pointing as FAR as possible. This is due to the fact that the pointing involve Raking out of joints which are constructed with a GOOD MOTOR and FILLING the joints with motor which, in many cases, is not sufficiently watered.

Right option is (b) LAYING trowel

The explanation is: A float is USED to spread mortar on the surface. It is made up of either METAL or wood. Metal float is ALSO known as laying trowel.

Correct answer is (a) Rust stains

The best explanation: WHEREAS, the uneven surface BECOMES prominent only due to poor workmanship of the work. To minimize the defects in PLASTERING works, some remedies should be undertaken such as the BOND of bricks should be properly MAINTAINED, etc.

The correct option is (d) Beaded

To EXPLAIN: The Beaded pointing is GOOD in appearance. But it is difficult to MAINTAIN as it can be easily DAMAGED.

Correct option is (a) Plaster of Paris

Easiest explanation: When water is added to plaster of Paris, it hardens in three to four minutes. Hence, to extend the setting TIME, SUITABLE retarders are added to it. The USUAL retarders are clay, citric acid, glue, gum, starch and sugar.

Right answer is (d) 1:4

To elaborate: The first coat in sand FACED FINISH is applied in 1:4 cement sand mortar. However, the mortar for the second coat has cement and sand in the RATIO 1:1. The first coat is provided with ZIGZAG lines.

Correct choice is (b) Blistering

For EXPLANATION I would say: DEVELOPMENT of swellings on the finished plastered surface is known as blistering. This is due to the presence of residual unslaked LIME nodules. It is caused by the formation of bubbles under the film of PAINT.

Correct choice is (B) Hydraulic MORTAR

Best explanation: Due to this, Hydraulic Mortar RESULTS into a blister on the surface known as blowing. The sand to be USED for preparing this lime Mortar for plastering work should be clean, coarse and free from any organic IMPURITIES.

Correct answer is (a) RUBBED

To elaborate: Rubbed or Keyed or Grooved type of POINTING use better appearance and is generally adopted. Whereas, Vee-pointing is a V shaped grooved that is formed in the mortar JOINT.

Correct option is (C) Flush

For explanation I would SAY: The joint is made flush with the face. This type of joint does not give good appearance. But it is durable at the does not provide any SPACE for ACCUMULATION of dust, water, ETC. and is extensively used.

The correct OPTION is (C) Skimming float

To elaborate: Wooden float is ALSO known as skimming float. It has a thickness of about 10-12 mm. It is USED for the finishing COAT of the plaster.

Correct answer is (c) KEENE’s CEMENT

Best EXPLANATION: Keene’s cement is useful for situation such as angles, skirtings, etc. as it sets hard in few days, giving WHITE and glass like polish. Whereas borax is calcined with plaster of Paris, Parian cement is obtained. It can be used in place of Keene’s plaster.

Correct option is (d) Blistering

The BEST I can explain: Blistering of PLASTERED surface is seen in the small patches swell out beyond the plane of the Plastered surface and ALSO it is seen in particularly in CASE of plastered SURFACES inside the building.