Please keep at least one language enabled. || కనీసం ఒక భాషను ఎంచుకోండి.
Question 1
ప్రశ్న 1
Sand delivered for a 12 mm cement-mortar plaster item contains clay lumps, organic matter and ungraded coarse particles. Which site decision best follows the material specification?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Plaster sand must be suitable for the specified mortar and finish. Harmful clay lumps and organic impurities may impair adhesion and finished quality. Excessively coarse particles can also interfere with a thin, even coat. Sand conforming to the applicable plaster-sand specification, such as IS 1542 where required, should be used. The unsuitable delivery must be corrected or replaced rather than accepted on appearance alone.
వివరణ:
Question 2
ప్రశ్న 2
Before cement plaster is applied to new brick masonry, the joints have been left completely flush and the wall is coated with dust. Which preparation is most appropriate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Plaster needs sound adhesion to the masonry background. Raking masonry joints provides an additional mechanical key for the first coat. IS 1661 describes preparing masonry joints to a depth of at least about 10 mm where plaster is applied directly. Dust and loose particles should be removed before the work starts. Controlled dampening reduces excessive water absorption from fresh mortar without leaving the surface waterlogged.
వివరణ:
Question 3
ప్రశ్న 3
A very smooth cast-in-situ RCC surface has residual form-release contamination and is to receive cement plaster. What is the appropriate preparatory treatment?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Smooth concrete may not provide sufficient mechanical key for cement plaster. Form-release contamination and laitance can further weaken adhesion. The concrete should be cleaned and suitably roughened or given an approved bonding-key treatment. Its suction and surface moisture should then be adjusted before application. Uncontrolled additional mortar thickness does not correct an unsound plaster background.
వివరణ:
Question 4
ప్రశ్న 4
An old absorbent brick wall is dry before plastering, while another nearby surface is saturated with standing water. Which principle should control pre-wetting of plaster backgrounds?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Excessive suction can rapidly remove water from freshly applied plaster. This may weaken bonding and increase the risk of poor surface quality. Conversely, a waterlogged surface can interfere with adhesion and application. The surface should be dampened according to its absorption and exposure conditions. Proper suction control is a fundamental part of plastering workmanship.
వివరణ:
Question 5
ప్రశ్న 5
A cement-mortar plaster item specifies cement to dry sand in the volumetric ratio 1:4. For a simplified batching problem, the combined dry ingredient volume is 0.90 m3, with no allowance for bulking or volume change. What quantities of cement and sand are required?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
A cement-to-sand ratio of 1:4 contains five total volume parts. The total stipulated dry ingredient volume is 0.90 m3. The cement share is 0.90/5 = 0.18 m3. The sand share is four times this value, or 0.72 m3. These are dry batching volumes and not the guaranteed volume of plastic mortar after mixing.
వివరణ:
Question 6
ప్రశ్న 6
During preparation of cement mortar for wall plastering, workers first pour water into a heap of unmixed cement and sand, producing lumps and uneven colour. Which correction is appropriate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Uniform mixing is essential for consistent plaster strength and appearance. Cement and sand should be combined in the specified proportions before water is introduced. Dry mixing until the colour is uniform helps distribute cement through the sand. Water is then added in a controlled manner to obtain suitable workability. The mortar should be produced in manageable batches and used before its permissible working time expires.
వివరణ:
Question 7
ప్రశ్న 7
Ordinary cement-sand plaster mortar was mixed with water 50 minutes earlier and has started to stiffen. No special retarding admixture or alternative approved procedure is specified. Under the cement-plaster working-time provision of IS 1661, what should be done?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
IS 1661 specifies that cement plaster should be used within half an hour after water is added. Its longer permitted working-time provision for cement-lime plaster is not interchangeable with ordinary cement-sand plaster. Mortar that has begun to set must not be made serviceable merely by repeated water addition. Such retempering can produce inconsistent quality and unreliable adhesion. Fresh mortar should be prepared in quantities that can be placed within the specified working period.
వివరణ:
Question 8
ప్రశ్న 8
Sand for a volume-batched 1:5 cement plaster mix becomes moist and increases in bulk without any increase in its actual dry sand mass. What is the correct batching interpretation?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Moist sand may occupy a larger apparent volume than the same dry sand. Uncorrected gauge-box measurements can therefore introduce less actual sand than intended. The specified mortar proportion refers to the intended quantities of the dry ingredients. A suitable bulking correction or controlled mass measurement addresses the variation. Random adjustment of cement content is not a reliable substitute for proper batching.
వివరణ:
Question 9
ప్రశ్న 9
An uninterrupted wall surface measuring 60 m2 is specified to receive a uniform 12 mm thick single coat of cement plaster. Ignoring waste and any deductions, what is the theoretical volume of plaster in place?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
A thickness of 12 mm is equivalent to 0.012 m. The given wall area is 60 m2. The theoretical finished plaster volume equals area multiplied by thickness. Therefore the volume is 60 x 0.012 = 0.720 m3. This quantity is the in-place volume and does not by itself include dry-material conversion, wastage or other estimating allowances.
వివరణ:
Question 10
ప్రశ్న 10
A two-coat cement plaster item specifies a 12 mm base coat followed by a 6 mm finishing coat. What is the intended total nominal thickness, and how should it be executed?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The finished thickness of a two-coat plaster consists of the sum of the specified coats. Adding 12 mm and 6 mm gives a nominal total of 18 mm. The first coat provides the body and an appropriate surface for the next coat. Its preparation and moisture condition must be suitable before the finishing coat is applied. Both coats should comply with the approved mix, workmanship and curing requirements.
వివరణ:
Question 11
ప్రశ్న 11
A plasterer attempts to obtain a truly vertical wall surface without using reference dots, screeds or any other reliable alignment control. What is the principal purpose of screeds in plastering?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Screeds are narrow plaster strips or bands formed as guides for adjoining work. Their positions are established to achieve the specified plane and alignment. A straightedge can then be worked between the guides to control the finished surface. Screeds also help limit irregular thickness caused by uneven application. They are workmanship aids and do not replace the need for sound background preparation or curing.
వివరణ:
Question 12
ప్రశ్న 12
In a two-coat plaster system, the first coat is left hard, glossy and smooth before the next coat is applied. Which workmanship correction best improves the intercoat bond?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Successive plaster coats require an adequate bond at their interface. A smooth, hardened backing coat may not provide sufficient mechanical interlock. The undercoat should be roughened at the appropriate stage as required by the chosen system. Its moisture condition must also be controlled before placing the next coat. Excess finishing thickness cannot reliably compensate for poor intercoat preparation.
వివరణ:
Question 13
ప్రశ్న 13
A plastered surface crosses the junction between an RCC column and brick infill masonry. The approved project details prescribe a suitable joint treatment to limit cracking. Which approach is correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Brick masonry and RCC may undergo different moisture and thermal movements. Plaster bridging such a junction can crack if the discontinuity is not adequately addressed. The designer's approved detail may require reinforcement, a controlled joint or another compatible treatment. The prescribed system must be installed with proper fixing and preparation. No single mesh or joint treatment should be assumed adequate for every background and movement condition.
వివరణ:
Question 14
ప్రశ్న 14
The exposed corners of a plastered pump-house doorway are uneven, weak and not in line with the adjacent walls. What should the supervisor require?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Doorway arrises and corners are part of the completed plaster finish. They should follow the dimensions and alignment required by the approved details. Suitable guides and corner protection can help achieve a durable and true edge. Weak, irregular corners can be damaged readily during service. Paint is not a substitute for properly constructed and accepted plasterwork.
వివరణ:
Question 15
ప్రశ్న 15
Under the trueness provision of IS 1661, what is the maximum permitted deviation of a finished plaster surface when checked with a 2 m straightedge?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
IS 1661 specifies a surface-trueness check using a straightedge 2 m long. The stated maximum deviation is 4 mm. The measurement provides a workmanship check on the evenness of the finished surface. It does not cancel any stricter tolerance expressly imposed by the contract. A surface exceeding the governing tolerance requires an appropriate engineering disposition or correction.
వివరణ:
Question 16
ప్రశ్న 16
A cement plaster finishing coat has hardened sufficiently to resist damage from gentle wetting. Which curing arrangement is consistent with IS 1661?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Cement plaster requires moisture for satisfactory cement hydration. IS 1661 specifies keeping the completed finishing coat wet for at least seven days. Moistening should begin when the plaster has hardened sufficiently to avoid surface injury. Gentle application, such as a fine spray, helps prevent washout or erosion. Protection from excessive heat, wind and other adverse weather is also necessary during the curing period.
వివరణ:
Question 17
ప్రశ్న 17
External cement plaster is being applied in hot, dry and windy weather. Which construction arrangement best reduces premature drying and surface defects?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Hot wind and direct sun can remove moisture from plaster very quickly. Rapid drying may weaken the surface and promote cracking or powdering. Suitable temporary protection helps limit evaporation while the plaster develops strength. Damp protective coverings and controlled curing can be appropriate depending on the site conditions. Changing mix proportions without approval does not replace environmental protection and curing.
వివరణ:
Question 18
ప్రశ్న 18
Cement plastering is required on the exterior of a multi-storey building. The contractor proposes an unstable single plank supported on loosely placed bricks as the working platform. Which response is appropriate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Plastering at height requires safe access and a stable working position. Temporary staging must be properly supported and suitable for the anticipated use. Platforms should be inspected and maintained in accordance with applicable safety requirements. Adjacent glazing, fittings and finished surfaces should also be protected against damage. The low unit weight of plaster mortar does not justify unsafe scaffolding.
వివరణ:
Question 19
ప్రశ్న 19
A wall is specified to receive a uniformly floated cement-plaster finish as a base for later painting, but the contractor creates a deeply textured finish without approval. What is the correct specification-based decision?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The specified plaster finish controls the texture and appearance required for subsequent work. A floated finish and an intentionally textured finish are not interchangeable descriptions. The paint system and expected appearance may depend on the underlying plaster surface. The contractor cannot change the finish solely for convenience. Any accepted alternative should be approved and reflected in the relevant item description and valuation.
వివరణ:
Question 20
ప్రశ్న 20
A bill of quantities includes 12 mm internal cement plaster in mortar 1:6, 20 mm external plaster in mortar 1:4, and separately finished ceiling plaster. Which measurement description is most appropriate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Plaster items must identify the workmanship and materials actually specified. Different mortar proportions and coat thicknesses affect material consumption and execution requirements. Wall and ceiling work may also require distinct descriptions and rates. Plastering is ordinarily measured by the area of the relevant finished surface, subject to the governing measurement provisions. Combining unlike items without an agreed composite description can create errors in estimation and payment.
వివరణ:
Question 21
ప్రశ్న 21
An estimate separately adds the cost of ordinary joint raking and surface cleaning to a plaster item, although the contract says those preparatory operations are already included in its rate. What should the estimator do?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
Preparatory work is necessary to obtain a sound background for plastering. It may be included within the main plastering item depending on the contract description. The question expressly states that ordinary joint raking and cleaning are already included. Adding them again as separate payable quantities would duplicate the same work. The estimator should follow the applicable item scope and record only separately authorized extra operations.
వివరణ:
Question 22
ప్రశ్న 22
One face of a wall is 9.00 m long and 3.20 m high. It contains a door opening 1.50 m by 2.00 m and a vent 0.75 m by 0.60 m. For THIS measurement problem, the contract explicitly requires full deduction of BOTH openings, no addition for reveals and no other adjustments. What is the net measured plaster area?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The gross plaster area on the wall face is 9.00 x 3.20 = 28.80 m2. The door area is 1.50 x 2.00 = 3.00 m2. The vent area is 0.75 x 0.60 = 0.45 m2. The stated problem expressly requires both areas to be deducted without adding reveals. The net area is therefore 28.80 - 3.00 - 0.45 = 25.35 m2.
వివరణ:
Question 23
ప్రశ్న 23
A plastering estimate contains 48 m2 of 12 mm plaster in cement mortar 1:4 and 36 m2 of 15 mm plaster in cement mortar 1:6. The contract has distinct rates for these two items. Which quantity entry is correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The two quantities relate to different specified plastering items. They have different coat thicknesses and cement-to-sand proportions. Their separately stated rates should be applied to the respective measured areas. The combined area of 84 m2 may be useful as a summary, but it does not replace item-wise measurement. Retaining separate descriptions prevents incorrect rate application and quantity reconciliation.
వివరణ:
Question 24
ప్రశ్న 24
A 100 m2 wall is to receive a uniform 15 mm thick cement plaster in dry volumetric proportion 1:5. For this simplified estimate, assume the required combined DRY ingredient volume is exactly 1.30 times the theoretical finished plaster volume, with no further wastage or bulking adjustment. What cement and sand volumes are required respectively?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The theoretical finished plaster volume is 100 x 0.015 = 1.50 m3. Applying the given dry-volume factor gives 1.50 x 1.30 = 1.95 m3 of dry ingredients. The mix 1:5 contains one cement part and five sand parts, for six parts in total. Cement volume is 1.95/6 = 0.325 m3. Sand volume is 5 x 0.325 = 1.625 m3, with no additional factors to be applied under the stated assumptions.
వివరణ:
Question 25
ప్రశ్న 25
A rectangular wall face measures 8.00 m by 3.00 m and contains one window opening 1.80 m wide and 1.50 m high. For this problem, deduct the entire window opening from the wall face and separately ADD plaster on all four flat internal returns of the window, each 0.20 m deep; there are no other openings or adjustments. What is the total measured plaster area?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
The gross wall-face area is 8.00 x 3.00 = 24.00 m2. The window opening has an area of 1.80 x 1.50 = 2.70 m2, giving a net main-face area of 21.30 m2. The combined edge length of the four returns is 2(1.80 + 1.50) = 6.60 m. At a uniform depth of 0.20 m, their additional plaster area is 6.60 x 0.20 = 1.32 m2. Thus the stipulated total measured plaster area is 21.30 + 1.32 = 22.62 m2.
వివరణ:
Answer Key సమాధానాల పట్టిక
-
Question 1 ప్రశ్న 1Answer: B. Reject or segregate the unsuitable sand and accept only material meeting the approved plaster-sand specification after the necessary checks. సమాధానం: B.
-
Question 2 ప్రశ్న 2Answer: D. Rake the masonry joints to provide a key, remove dust and loose material, and dampen the surface appropriately before application. సమాధానం: D.
-
Question 3 ప్రశ్న 3Answer: A. Remove contamination, develop an approved mechanical key by suitable roughening or spatter-dash treatment, and adjust the surface moisture before plastering. సమాధానం: A.
-
Question 4 ప్రశ్న 4Answer: C. Bring the background to a suitably damp condition with controlled suction, avoiding both excessive absorption and free standing water. సమాధానం: C.
-
Question 5 ప్రశ్న 5Answer: A. 0.18 m3 cement and 0.72 m3 sand. సమాధానం: A.
-
Question 6 ప్రశ్న 6Answer: C. Dry-mix the measured cement and sand until uniform, then add controlled water and mix to the required workable consistency. సమాధానం: C.
-
Question 7 ప్రశ్న 7Answer: D. Reject the aged or partially set mortar and prepare a fresh batch for plastering. సమాధానం: D.
-
Question 8 ప్రశ్న 8Answer: B. Determine and apply a suitable bulking correction or use an approved mass-based method so that the specified dry-material proportion is maintained. సమాధానం: B.
-
Question 9 ప్రశ్న 9Answer: C. 0.720 m3. సమాధానం: C.
-
Question 10 ప్రశ్న 10Answer: A. 18 mm, by applying the two specified coats with suitable intermediate preparation and curing. సమాధానం: A.
-
Question 11 ప్రశ్న 11Answer: D. To provide accurately aligned reference strips for controlling the plane and thickness of the plaster surface. సమాధానం: D.
-
Question 12 ప్రశ్న 12Answer: B. Provide the specified roughened key on the first coat and prepare and dampen it appropriately before applying the next coat. సమాధానం: B.
-
Question 13 ప్రశ్న 13Answer: C. Carry out the approved junction treatment, recognizing possible differential movement between dissimilar backgrounds. సమాధానం: C.
-
Question 14 ప్రశ్న 14Answer: A. Form straight, true corners and sound arrises using suitable guides or approved corner protection where specified. సమాధానం: A.
-
Question 15 ప్రశ్న 15Answer: B. 4 mm. సమాధానం: B.
-
Question 16 ప్రశ్న 16Answer: D. Keep the finished plaster adequately wet for at least seven days, using gentle watering and protection against adverse weather. సమాధానం: D.
-
Question 17 ప్రశ్న 17Answer: C. Provide suitable shade or wet coverings as required, control drying and continue the prescribed moisture curing without damaging the fresh surface. సమాధానం: C.
-
Question 18 ప్రశ్న 18Answer: A. Provide properly erected, inspected and stable scaffolding or staging with suitable working platforms and protection for workers and adjacent surfaces. సమాధానం: A.
-
Question 19 ప్రశ్న 19Answer: D. Require the approved finish and workmanship standard, or obtain authorization before substituting a different texture. సమాధానం: D.
-
Question 20 ప్రశ్న 20Answer: B. Describe and measure the different mixes, coat thicknesses, backgrounds and locations under suitable separate items, using area as the ordinary measurement basis. సమాధానం: B.
-
Question 21 ప్రశ్న 21Answer: A. Avoid duplicate charging and follow the express inclusions and exclusions in the plaster item and contract. సమాధానం: A.
-
Question 22 ప్రశ్న 22Answer: C. 25.35 m2. సమాధానం: C.
-
Question 23 ప్రశ్న 23Answer: D. Two separate plaster quantities, 48 m2 and 36 m2, described with their respective mix proportions and thicknesses. సమాధానం: D.
-
Question 24 ప్రశ్న 24Answer: B. 0.325 m3 and 1.625 m3. సమాధానం: B.
-
Question 25 ప్రశ్న 25Answer: C. 22.62 m2. సమాధానం: C.