Please keep at least one language enabled. || కనీసం ఒక భాషను ఎంచుకోండి.
Question 1
ప్రశ్న 1
Which statement most accurately describes the scope of IS 1077:2025 for common burnt clay building bricks?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 is the sixth-revision specification for common burnt clay building bricks used in buildings.
• Its scope includes classification, general quality, dimensions and relevant physical requirements rather than dimensions alone.
• Classification under this standard is linked principally to the minimum average compressive strength of the bricks.
• The scope is limited to common burnt clay bricks having compressive strength below 40 N/mm², with higher-strength burnt clay bricks addressed under the separate heavy-duty brick specification.
• Therefore Option B correctly describes both the breadth and the limitation of the standard.
• Its scope includes classification, general quality, dimensions and relevant physical requirements rather than dimensions alone.
• Classification under this standard is linked principally to the minimum average compressive strength of the bricks.
• The scope is limited to common burnt clay bricks having compressive strength below 40 N/mm², with higher-strength burnt clay bricks addressed under the separate heavy-duty brick specification.
• Therefore Option B correctly describes both the breadth and the limitation of the standard.
వివరణ:
Question 2
ప్రశ్న 2
Which of the following gives the complete sequence of compressive-strength class designations specified for common burnt clay building bricks in IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 specifies eleven compressive-strength classes for common burnt clay building bricks.
• These classes are 3.5, 5, 7.5, 10, 12.5, 15, 17.5, 20, 25, 30 and 35.
• Each numerical class designation corresponds to the specified minimum average compressive strength in N/mm².
• Class 40 is not included because IS 1077:2025 covers common burnt clay bricks having compressive strength below 40 N/mm².
• Option A therefore reproduces the complete class sequence without omitting Class 17.5 or improperly introducing Class 40.
• These classes are 3.5, 5, 7.5, 10, 12.5, 15, 17.5, 20, 25, 30 and 35.
• Each numerical class designation corresponds to the specified minimum average compressive strength in N/mm².
• Class 40 is not included because IS 1077:2025 covers common burnt clay bricks having compressive strength below 40 N/mm².
• Option A therefore reproduces the complete class sequence without omitting Class 17.5 or improperly introducing Class 40.
వివరణ:
Question 3
ప్రశ్న 3
The designation 'Class 25' for a common burnt clay building brick under IS 1077:2025 principally indicates that:
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The class designation of a common burnt clay building brick is based on its specified minimum average compressive strength.
• Consequently, Class 25 corresponds to a minimum average compressive strength of 25 N/mm² when tested according to the prescribed method.
• The number in the class designation does not represent clay content or brick density.
• Water absorption is controlled independently by a separate physical requirement and is not represented by the class number.
• Therefore Option C is the correct interpretation of the Class 25 designation.
• Consequently, Class 25 corresponds to a minimum average compressive strength of 25 N/mm² when tested according to the prescribed method.
• The number in the class designation does not represent clay content or brick density.
• Water absorption is controlled independently by a separate physical requirement and is not represented by the class number.
• Therefore Option C is the correct interpretation of the Class 25 designation.
వివరణ:
Question 4
ప్రశ్న 4
A lot of common burnt clay bricks gives an average compressive strength of 18.2 N/mm², and the strength of every individual tested brick is at least 15.2 N/mm². Based only on the strength requirements of IS 1077:2025, what is the highest class for which this result can qualify?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The average strength of 18.2 N/mm² exceeds the 17.5 N/mm² minimum average strength required for Class 17.5.
• It does not reach the 20 N/mm² minimum average required for Class 20, so Class 20 cannot be assigned.
• For Class 17.5, the compressive strength of an individual tested brick must not fall more than 15 percent below 17.5 N/mm².
• The corresponding individual lower limit is 17.5 × 0.85 = 14.875 N/mm², and the minimum stated individual value of 15.2 N/mm² exceeds this limit.
• Hence Class 17.5 is the highest class supported by the given strength data, making Option B correct.
• It does not reach the 20 N/mm² minimum average required for Class 20, so Class 20 cannot be assigned.
• For Class 17.5, the compressive strength of an individual tested brick must not fall more than 15 percent below 17.5 N/mm².
• The corresponding individual lower limit is 17.5 × 0.85 = 14.875 N/mm², and the minimum stated individual value of 15.2 N/mm² exceeds this limit.
• Hence Class 17.5 is the highest class supported by the given strength data, making Option B correct.
వివరణ:
Question 5
ప్రశ్న 5
For a Class 20 common burnt clay brick lot, what is the lowest individual compressive-strength value permitted by the 15 percent individual-brick provision of IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The specified minimum average compressive strength for Class 20 is 20 N/mm².
• The strength of an individual tested brick is permitted to fall below the corresponding class strength by no more than 15 percent.
• Fifteen percent of 20 N/mm² is 3 N/mm².
• Therefore the lower permissible individual value is 20 − 3 = 17 N/mm², which is equivalently obtained from 20 × 0.85.
• Option C is consequently the correct minimum individual strength associated with the stated provision.
• The strength of an individual tested brick is permitted to fall below the corresponding class strength by no more than 15 percent.
• Fifteen percent of 20 N/mm² is 3 N/mm².
• Therefore the lower permissible individual value is 20 − 3 = 17 N/mm², which is equivalently obtained from 20 × 0.85.
• Option C is consequently the correct minimum individual strength associated with the stated provision.
వివరణ:
Question 6
ప్రశ్న 6
A brick lot has an average compressive strength of 15.8 N/mm², but one tested brick has a strength of 12.6 N/mm². Which conclusion is correct for Class 15 assessment under IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The minimum average compressive strength required for Class 15 is 15 N/mm², so the stated average of 15.8 N/mm² satisfies the average criterion.
• However, compliance also requires that no individual tested brick fall more than 15 percent below the class strength.
• The lower individual limit for Class 15 is 15 × 0.85 = 12.75 N/mm².
• The individual result of 12.6 N/mm² is below 12.75 N/mm², so the lot does not satisfy the Class 15 individual-strength requirement.
• The relevant procedure is to check the lot against the next lower class rather than automatically assigning an arbitrary lower classification.
• However, compliance also requires that no individual tested brick fall more than 15 percent below the class strength.
• The lower individual limit for Class 15 is 15 × 0.85 = 12.75 N/mm².
• The individual result of 12.6 N/mm² is below 12.75 N/mm², so the lot does not satisfy the Class 15 individual-strength requirement.
• The relevant procedure is to check the lot against the next lower class rather than automatically assigning an arbitrary lower classification.
వివరణ:
Question 7
ప్రశ్న 7
A burnt clay brick is required to have a compressive-strength class of 40 N/mm². Which interpretation is correct with respect to IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 covers common burnt clay building bricks having compressive strength below 40 N/mm².
• Its highest common-brick class designation is therefore Class 35 rather than Class 40.
• A burnt clay unit required at the 40 N/mm² level falls outside this common-brick classification and should be specified under the applicable heavy-duty burnt clay brick standard.
• It would be technically incorrect to reduce the specified requirement to Class 35 merely to keep the brick within IS 1077.
• Option B correctly recognizes the scope boundary between common and heavy-duty burnt clay building bricks.
• Its highest common-brick class designation is therefore Class 35 rather than Class 40.
• A burnt clay unit required at the 40 N/mm² level falls outside this common-brick classification and should be specified under the applicable heavy-duty burnt clay brick standard.
• It would be technically incorrect to reduce the specified requirement to Class 35 merely to keep the brick within IS 1077.
• Option B correctly recognizes the scope boundary between common and heavy-duty burnt clay building bricks.
వివరణ:
Question 8
ప్రశ్న 8
Which pair represents the standard modular sizes of common burnt clay building bricks specified in IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 specifies 190 × 90 × 90 mm as one standard modular size of common burnt clay building brick.
• It also specifies the thinner modular size of 190 × 90 × 40 mm.
• A dimension such as 200 × 100 × 100 mm is commonly associated with the coordinating masonry module including joint allowance rather than the manufactured brick size specified here.
• Dimensions beginning with 230 mm occur among the non-modular brick sizes rather than the modular sizes.
• Therefore Option A contains the two specified modular product dimensions.
• It also specifies the thinner modular size of 190 × 90 × 40 mm.
• A dimension such as 200 × 100 × 100 mm is commonly associated with the coordinating masonry module including joint allowance rather than the manufactured brick size specified here.
• Dimensions beginning with 230 mm occur among the non-modular brick sizes rather than the modular sizes.
• Therefore Option A contains the two specified modular product dimensions.
వివరణ:
Question 9
ప్రశ్న 9
Which option contains only non-modular common burnt clay brick sizes listed in IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 lists 230 × 110 × 75 mm as a permissible non-modular brick size.
• It also lists 230 × 110 × 70 mm and 230 × 150 × 70 mm in the non-modular category.
• The fourth listed non-modular size relevant here is 255 × 120 × 75 mm.
• The other answer choices contain modular dimensions, coordinating dimensions or dimensional combinations that are not among the listed non-modular product sizes.
• Hence only Option A consists entirely of the non-modular sizes specified in the standard.
• It also lists 230 × 110 × 70 mm and 230 × 150 × 70 mm in the non-modular category.
• The fourth listed non-modular size relevant here is 255 × 120 × 75 mm.
• The other answer choices contain modular dimensions, coordinating dimensions or dimensional combinations that are not among the listed non-modular product sizes.
• Hence only Option A consists entirely of the non-modular sizes specified in the standard.
వివరణ:
Question 10
ప్రశ్న 10
For normal modular brickwork, which statement correctly relates the manufactured brick size to its coordinating dimension?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Modular coordination distinguishes the actual manufactured size of the brick from the coordinating dimension occupied by the brick together with the intended joint allowance.
• A standard modular common burnt clay brick has a manufactured dimension of 190 × 90 × 90 mm.
• With a nominal allowance of about 10 mm for mortar joints, it coordinates with a 200 × 100 × 100 mm module in masonry.
• This dimensional relationship simplifies coordination of masonry with building grids, openings and other components.
• Therefore Option A correctly distinguishes the product size from the coordinating masonry dimension.
• A standard modular common burnt clay brick has a manufactured dimension of 190 × 90 × 90 mm.
• With a nominal allowance of about 10 mm for mortar joints, it coordinates with a 200 × 100 × 100 mm module in masonry.
• This dimensional relationship simplifies coordination of masonry with building grids, openings and other components.
• Therefore Option A correctly distinguishes the product size from the coordinating masonry dimension.
వివరణ:
Question 11
ప్రశ్న 11
Using a coordinating module of 200 × 100 × 100 mm for a standard modular brick together with its associated mortar-joint allowance, approximately how many such brick modules occupy 1 m³ of masonry?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The coordinating volume associated with one modular brick is 0.20 × 0.10 × 0.10 m³.
• This gives a volume of 0.002 m³ for each brick-and-joint module.
• The approximate number of modules in one cubic metre is therefore 1 / 0.002 = 500.
• Because coordinating dimensions are being used, the associated mortar-joint allowance is already represented in the dimensional module.
• Hence Option C is correct, while calculation using only the bare 190 × 90 × 90 mm brick volume would represent a different quantity.
• This gives a volume of 0.002 m³ for each brick-and-joint module.
• The approximate number of modules in one cubic metre is therefore 1 / 0.002 = 500.
• Because coordinating dimensions are being used, the associated mortar-joint allowance is already represented in the dimensional module.
• Hence Option C is correct, while calculation using only the bare 190 × 90 × 90 mm brick volume would represent a different quantity.
వివరణ:
Question 12
ప్రశ్న 12
Which statement correctly represents the frog requirement for common burnt clay building bricks under IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 requires the specified hand-moulded bricks of 90 mm or 70 mm height to be moulded with a frog on one flat side.
• The prescribed frog depth for these bricks is 10 mm to 20 mm.
• Bricks of 40 mm height and bricks manufactured by the extrusion process may be produced without frogs.
• The frog requirement concerns geometry and manufacture and does not establish the compressive-strength class of the brick.
• Option B accurately states both the requirement and the important exceptions.
• The prescribed frog depth for these bricks is 10 mm to 20 mm.
• Bricks of 40 mm height and bricks manufactured by the extrusion process may be produced without frogs.
• The frog requirement concerns geometry and manufacture and does not establish the compressive-strength class of the brick.
• Option B accurately states both the requirement and the important exceptions.
వివరణ:
Question 13
ప్రశ్న 13
Consider the following statements regarding the general quality requirements of common burnt clay bricks under IS 1077:2025:
1. Bricks may be hand-moulded or machine-moulded.
2. They should be free from cracks, flaws and nodules of free lime.
3. Their faces should be plain and rectangular with sharp corners.
4. Variation in colour is mandatory for demonstrating adequate burning.
Which statements are correct?
1. Bricks may be hand-moulded or machine-moulded.
2. They should be free from cracks, flaws and nodules of free lime.
3. Their faces should be plain and rectangular with sharp corners.
4. Variation in colour is mandatory for demonstrating adequate burning.
Which statements are correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Statement 1 is correct because common burnt clay building bricks may be hand-moulded or machine-moulded.
• Statement 2 is correct because cracks, flaws and nodules of free lime are inconsistent with the specified general quality requirements.
• Statement 3 is also correct because the bricks are required to have plain rectangular faces with sharp corners.
• Statement 4 is incorrect because uniformity of colour is required rather than deliberate colour variation.
• Therefore Statements 1, 2 and 3 are correct, making Option B the only valid combination.
• Statement 2 is correct because cracks, flaws and nodules of free lime are inconsistent with the specified general quality requirements.
• Statement 3 is also correct because the bricks are required to have plain rectangular faces with sharp corners.
• Statement 4 is incorrect because uniformity of colour is required rather than deliberate colour variation.
• Therefore Statements 1, 2 and 3 are correct, making Option B the only valid combination.
వివరణ:
Question 14
ప్రశ్న 14
Which procedure most closely reflects the dimensional-tolerance measurement method prescribed for common burnt clay bricks in IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The dimensional conformity procedure is based on measurement of an assembled group rather than on one conveniently selected individual brick.
• Twenty or more whole bricks, according to the applicable arrangement, are selected from the sample for this purpose.
• Blisters, loose particles of clay and small projections that could interfere with measurement are first removed.
• The bricks are arranged in contact with one another in a straight line on a level surface, and the overall dimension is measured with a suitable inextensible measuring device.
• Therefore Option B most accurately represents the specified grouped dimensional-measurement procedure.
• Twenty or more whole bricks, according to the applicable arrangement, are selected from the sample for this purpose.
• Blisters, loose particles of clay and small projections that could interfere with measurement are first removed.
• The bricks are arranged in contact with one another in a straight line on a level surface, and the overall dimension is measured with a suitable inextensible measuring device.
• Therefore Option B most accurately represents the specified grouped dimensional-measurement procedure.
వివరణ:
Question 15
ప్రశ్న 15
Match each grouped dimensional requirement with its correct reference value under IS 1077:2025:
1. Length of 20 modular bricks
2. Length of 20 non-modular 230 mm bricks
3. Height of 20 modular bricks of 40 mm height
4. Height of 20 non-modular bricks of 70 mm height
P. 800 ± 40 mm
Q. 1400 ± 40 mm
R. 3800 ± 80 mm
S. 4600 ± 80 mm
1. Length of 20 modular bricks
2. Length of 20 non-modular 230 mm bricks
3. Height of 20 modular bricks of 40 mm height
4. Height of 20 non-modular bricks of 70 mm height
P. 800 ± 40 mm
Q. 1400 ± 40 mm
R. 3800 ± 80 mm
S. 4600 ± 80 mm
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Twenty modular bricks of 190 mm length have a reference combined length of 3800 mm with a tolerance of ±80 mm, so 1-R is correct.
• Twenty non-modular bricks of 230 mm length correspond to 4600 mm with a tolerance of ±80 mm, giving 2-S.
• Twenty modular bricks of 40 mm height correspond to a combined height of 800 mm with a tolerance of ±40 mm, giving 3-P.
• Twenty non-modular bricks of 70 mm height correspond to 1400 mm with a tolerance of ±40 mm, giving 4-Q.
• Therefore the unique matching is 1-R, 2-S, 3-P and 4-Q, which corresponds to Option A.
• Twenty non-modular bricks of 230 mm length correspond to 4600 mm with a tolerance of ±80 mm, giving 2-S.
• Twenty modular bricks of 40 mm height correspond to a combined height of 800 mm with a tolerance of ±40 mm, giving 3-P.
• Twenty non-modular bricks of 70 mm height correspond to 1400 mm with a tolerance of ±40 mm, giving 4-Q.
• Therefore the unique matching is 1-R, 2-S, 3-P and 4-Q, which corresponds to Option A.
వివరణ:
Question 16
ప్రశ్న 16
Twenty modular bricks of size 190 × 90 × 90 mm give combined measured dimensions of 3882 mm in the length arrangement, 1805 mm in the width arrangement and 1790 mm in the height arrangement. What is the correct dimensional conclusion under IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• For 20 modular bricks, the permitted combined length is 3800 ± 80 mm, giving an acceptable range of 3720 mm to 3880 mm.
• The measured length of 3882 mm exceeds the upper limit of 3880 mm and therefore fails the length requirement.
• The permitted combined width is 1800 ± 40 mm, so 1805 mm lies within the acceptable range of 1760 mm to 1840 mm.
• For 90 mm high modular bricks, the combined height requirement is also 1800 ± 40 mm, and 1790 mm satisfies that limit.
• Therefore only the length measurement fails, making Option C the correct conclusion.
• The measured length of 3882 mm exceeds the upper limit of 3880 mm and therefore fails the length requirement.
• The permitted combined width is 1800 ± 40 mm, so 1805 mm lies within the acceptable range of 1760 mm to 1840 mm.
• For 90 mm high modular bricks, the combined height requirement is also 1800 ± 40 mm, and 1790 mm satisfies that limit.
• Therefore only the length measurement fails, making Option C the correct conclusion.
వివరణ:
Question 17
ప్రశ్న 17
A row of 20 modular bricks has a measured combined length of 3816 mm. What mean length does this grouped measurement represent?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The mean length represented by the grouped measurement is found by dividing the overall measured length by the number of bricks.
• Therefore the mean length is 3816 / 20 = 190.8 mm.
• The standard product dimension for the modular brick is 190 mm, so the computed mean is 0.8 mm greater than that reference value.
• Compliance itself is assessed using the prescribed grouped dimensional limits rather than by inventing an independent tolerance of ±0.8 mm for each brick.
• The requested mean dimension is therefore 190.8 mm, which corresponds to Option C.
• Therefore the mean length is 3816 / 20 = 190.8 mm.
• The standard product dimension for the modular brick is 190 mm, so the computed mean is 0.8 mm greater than that reference value.
• Compliance itself is assessed using the prescribed grouped dimensional limits rather than by inventing an independent tolerance of ±0.8 mm for each brick.
• The requested mean dimension is therefore 190.8 mm, which corresponds to Option C.
వివరణ:
Question 18
ప్రశ్న 18
Twenty non-modular bricks of size 230 × 110 × 70 mm give grouped measurements of 4515 mm for length, 2220 mm for width and 1410 mm for height. Based on the grouped dimensional limits applicable to this size, what is the correct conclusion?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• For 20 bricks of 230 mm length, the reference combined length is 4600 mm with a tolerance of ±80 mm.
• The acceptable length range is therefore 4520 mm to 4680 mm, and the measured value of 4515 mm is below the lower limit.
• The combined width requirement for 20 bricks of 110 mm width is 2200 ± 40 mm, so 2220 mm is acceptable.
• For bricks of 70 mm height, the combined height requirement is 1400 ± 40 mm, and 1410 mm is also acceptable.
• Consequently only the length measurement fails, making Option B the correct answer.
• The acceptable length range is therefore 4520 mm to 4680 mm, and the measured value of 4515 mm is below the lower limit.
• The combined width requirement for 20 bricks of 110 mm width is 2200 ± 40 mm, so 2220 mm is acceptable.
• For bricks of 70 mm height, the combined height requirement is 1400 ± 40 mm, and 1410 mm is also acceptable.
• Consequently only the length measurement fails, making Option B the correct answer.
వివరణ:
Question 19
ప్రశ్న 19
During a dimensional check, it is impracticable to arrange all the bricks required for the complete measurement in one row. Which procedure is permitted by IS 1077:2025?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The preferred procedure measures the complete assembled row with a steel tape or another suitable inextensible measure sufficiently long to cover it in one stretch.
• Repeated application of a short rule or measure is not permitted because cumulative positioning errors can affect the result.
• If arranging the required bricks in one row is impracticable, the sample may be divided into rows of 10 bricks each.
• Those rows are measured separately to the prescribed precision and their dimensions are then added together.
• Therefore Option B describes the permitted alternative while preserving the grouped-measurement principle.
• Repeated application of a short rule or measure is not permitted because cumulative positioning errors can affect the result.
• If arranging the required bricks in one row is impracticable, the sample may be divided into rows of 10 bricks each.
• Those rows are measured separately to the prescribed precision and their dimensions are then added together.
• Therefore Option B describes the permitted alternative while preserving the grouped-measurement principle.
వివరణ:
Question 20
ప్రశ్న 20
What is the most appropriate interpretation of the grouped dimensional-tolerance method used for common burnt clay bricks?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The standard specifies dimensional limits for groups of bricks assembled and measured together.
• This approach evaluates cumulative dimensional variation that can affect courses, joints and dimensional coordination in masonry construction.
• The stated tolerance for a group of bricks should therefore not be divided mechanically and represented as an independently specified tolerance for every single unit.
• The grouped procedure does not imply that individual dimensions are irrelevant or that arbitrary brick dimensions are acceptable.
• Option A gives the technically sound interpretation of the grouped dimensional-tolerance method.
• This approach evaluates cumulative dimensional variation that can affect courses, joints and dimensional coordination in masonry construction.
• The stated tolerance for a group of bricks should therefore not be divided mechanically and represented as an independently specified tolerance for every single unit.
• The grouped procedure does not imply that individual dimensions are irrelevant or that arbitrary brick dimensions are acceptable.
• Option A gives the technically sound interpretation of the grouped dimensional-tolerance method.
వివరణ:
Question 21
ప్రశ్న 21
According to IS 1077:2025, which statement about product marking is correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Marking provides traceability of the manufactured product and is a requirement separate from dimensional and physical-property testing.
• Each brick is required to carry an indication of its source of manufacture.
• Where a frog is provided, the source identification is placed in the frog.
• The standard does not require the individual measured compressive strength or water-absorption percentage to be written on each brick.
• Therefore Option B correctly states the relevant marking requirement.
• Each brick is required to carry an indication of its source of manufacture.
• Where a frog is provided, the source identification is placed in the frog.
• The standard does not require the individual measured compressive strength or water-absorption percentage to be written on each brick.
• Therefore Option B correctly states the relevant marking requirement.
వివరణ:
Question 22
ప్రశ్న 22
Match the function with the applicable Indian Standard used in conjunction with IS 1077:2025:
1. Terminology for clay products for buildings
2. Sampling of burnt clay bricks and burnt clay tiles
3. Determination of compressive strength of burnt clay building bricks
P. IS 3495 (Part 1):2019
Q. IS 2248:2025
R. IS 5454:2024
1. Terminology for clay products for buildings
2. Sampling of burnt clay bricks and burnt clay tiles
3. Determination of compressive strength of burnt clay building bricks
P. IS 3495 (Part 1):2019
Q. IS 2248:2025
R. IS 5454:2024
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 2248:2025 provides the glossary of terms applicable to clay products for buildings, so the first association is 1-Q.
• IS 5454:2024 deals with methods of sampling for burnt clay bricks and burnt clay tiles, giving 2-R.
• IS 3495 (Part 1):2019 specifies the method for determining the compressive strength of burnt clay building bricks, giving 3-P.
• These standards serve different purposes in terminology, sampling and physical testing and therefore should not be interchanged.
• The correct combination is 1-Q, 2-R and 3-P, making Option A the unique answer.
• IS 5454:2024 deals with methods of sampling for burnt clay bricks and burnt clay tiles, giving 2-R.
• IS 3495 (Part 1):2019 specifies the method for determining the compressive strength of burnt clay building bricks, giving 3-P.
• These standards serve different purposes in terminology, sampling and physical testing and therefore should not be interchanged.
• The correct combination is 1-Q, 2-R and 3-P, making Option A the unique answer.
వివరణ:
Question 23
ప్రశ్న 23
An engineer encounters a project note that still treats IS 1077:1992 as the current specification for common burnt clay building bricks. Which action is technically appropriate under the presently applicable BIS framework?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 is the sixth revision of the specification for common burnt clay building bricks.
• The earlier IS 1077:1992 edition was allowed a defined concurrent period and was subsequently withdrawn, so it should not be treated as the presently applicable edition.
• A current project should therefore verify brick requirements against the 2025 edition rather than automatically carrying forward values from an obsolete specification.
• This matters because classifications, dimensions, referenced test standards and physical requirements can change when a standard is revised.
• Consequently Option B is the technically appropriate response to an obsolete project reference.
• The earlier IS 1077:1992 edition was allowed a defined concurrent period and was subsequently withdrawn, so it should not be treated as the presently applicable edition.
• A current project should therefore verify brick requirements against the 2025 edition rather than automatically carrying forward values from an obsolete specification.
• This matters because classifications, dimensions, referenced test standards and physical requirements can change when a standard is revised.
• Consequently Option B is the technically appropriate response to an obsolete project reference.
వివరణ:
Question 24
ప్రశ్న 24
A supplier describes a masonry unit as a '200 × 100 × 100 mm modular brick', but the bare bricks are to be checked against the standard modular product dimensions. What should the inspector recognize?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The manufactured size of a standard modular common burnt clay brick is 190 × 90 × 90 mm.
• In masonry coordination, an allowance for the mortar joint produces a coordinating module of approximately 200 × 100 × 100 mm.
• Confusing the coordinating dimension with the bare product dimension can lead to an incorrect inspection decision.
• A brick measuring 190 × 90 × 90 mm is therefore a modular brick rather than a non-modular unit merely because the coordinating module is larger.
• Option B correctly distinguishes manufactured dimensions from the associated coordinating dimensions.
• In masonry coordination, an allowance for the mortar joint produces a coordinating module of approximately 200 × 100 × 100 mm.
• Confusing the coordinating dimension with the bare product dimension can lead to an incorrect inspection decision.
• A brick measuring 190 × 90 × 90 mm is therefore a modular brick rather than a non-modular unit merely because the coordinating module is larger.
• Option B correctly distinguishes manufactured dimensions from the associated coordinating dimensions.
వివరణ:
Question 25
ప్రశ్న 25
A batch is specified as Class 17.5 modular common burnt clay bricks of size 190 × 90 × 90 mm. Twenty bricks give grouped dimensions of 3840 mm in length, 1815 mm in width and 1785 mm in height. Their average compressive strength is 18.0 N/mm², but one individual tested brick has a compressive strength of 14.8 N/mm². Which conclusion is correct based on these results?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The permissible combined length for 20 modular bricks is 3800 ± 80 mm, and the measured 3840 mm is within this range.
• The width and 90 mm height requirements are each 1800 ± 40 mm, so the measured 1815 mm and 1785 mm values also comply.
• The average compressive strength of 18.0 N/mm² exceeds the minimum average requirement of 17.5 N/mm² for Class 17.5.
• However, the permissible individual lower limit is 17.5 × 0.85 = 14.875 N/mm², and the individual result of 14.8 N/mm² falls below this limit.
• Therefore the dimensional requirements are satisfied but the Class 17.5 individual-strength requirement is not satisfied, making Option C correct.
• The width and 90 mm height requirements are each 1800 ± 40 mm, so the measured 1815 mm and 1785 mm values also comply.
• The average compressive strength of 18.0 N/mm² exceeds the minimum average requirement of 17.5 N/mm² for Class 17.5.
• However, the permissible individual lower limit is 17.5 × 0.85 = 14.875 N/mm², and the individual result of 14.8 N/mm² falls below this limit.
• Therefore the dimensional requirements are satisfied but the Class 17.5 individual-strength requirement is not satisfied, making Option C correct.
వివరణ:
Answer Key సమాధానాల పట్టిక
-
Question 1 ప్రశ్న 1Answer: B. It specifies classification, general quality, dimensions and physical requirements for common burnt clay building bricks used in buildings. సమాధానం: B.
-
Question 2 ప్రశ్న 2Answer: A. 3.5, 5, 7.5, 10, 12.5, 15, 17.5, 20, 25, 30 and 35 సమాధానం: A.
-
Question 3 ప్రశ్న 3Answer: C. the minimum average compressive strength is 25 N/mm² సమాధానం: C.
-
Question 4 ప్రశ్న 4Answer: B. Class 17.5 సమాధానం: B.
-
Question 5 ప్రశ్న 5Answer: C. 17.0 N/mm² సమాధానం: C.
-
Question 6 ప్రశ్న 6Answer: C. The lot does not satisfy the Class 15 individual-strength requirement and is to be checked for the next lower class. సమాధానం: C.
-
Question 7 ప్రశ్న 7Answer: B. It lies outside the less-than-40 N/mm² scope of IS 1077:2025 and should be considered under the applicable heavy-duty burnt clay brick specification. సమాధానం: B.
-
Question 8 ప్రశ్న 8Answer: A. 190 × 90 × 90 mm and 190 × 90 × 40 mm సమాధానం: A.
-
Question 9 ప్రశ్న 9Answer: A. 230 × 110 × 75 mm; 230 × 110 × 70 mm; 230 × 150 × 70 mm; 255 × 120 × 75 mm సమాధానం: A.
-
Question 10 ప్రశ్న 10Answer: A. A 190 × 90 × 90 mm brick corresponds to a coordinating dimension of approximately 200 × 100 × 100 mm when the mortar-joint allowance is included. సమాధానం: A.
-
Question 11 ప్రశ్న 11Answer: C. 500 సమాధానం: C.
-
Question 12 ప్రశ్న 12Answer: B. Hand-moulded bricks of 90 mm or 70 mm height are provided with a frog 10 mm to 20 mm deep, whereas 40 mm high bricks and extruded bricks may be without frogs. సమాధానం: B.
-
Question 13 ప్రశ్న 13Answer: B. 1, 2 and 3 only సమాధానం: B.
-
Question 14 ప్రశ్న 14Answer: B. Select 20 or more whole bricks as applicable, arrange them in contact in a straight line on a level surface and measure the combined dimension. సమాధానం: B.
-
Question 15 ప్రశ్న 15Answer: A. 1-R, 2-S, 3-P, 4-Q సమాధానం: A.
-
Question 16 ప్రశ్న 16Answer: C. Only the length measurement fails, so the dimensional requirement is not satisfied. సమాధానం: C.
-
Question 17 ప్రశ్న 17Answer: C. 190.8 mm సమాధానం: C.
-
Question 18 ప్రశ్న 18Answer: B. The length measurement fails while the width and height measurements satisfy their limits. సమాధానం: B.
-
Question 19 ప్రశ్న 19Answer: B. Divide the sample into rows of 10 bricks, measure the rows separately to the prescribed precision and add the measured dimensions. సమాధానం: B.
-
Question 20 ప్రశ్న 20Answer: A. It controls cumulative dimensional variation of a group of masonry units rather than treating the stated group tolerance as an individual-brick tolerance. సమాధానం: A.
-
Question 21 ప్రశ్న 21Answer: B. Each brick is to carry an indication of the source of manufacture, placed in the frog where a frog is provided. సమాధానం: B.
-
Question 22 ప్రశ్న 22Answer: A. 1-Q, 2-R, 3-P సమాధానం: A.
-
Question 23 ప్రశ్న 23Answer: B. Use IS 1077:2025 as the current sixth revision and review any old numerical requirement before carrying it forward. సమాధానం: B.
-
Question 24 ప్రశ్న 24Answer: B. The 200 × 100 × 100 mm value can represent the coordinating masonry dimension including joint allowance, while the corresponding manufactured modular brick is 190 × 90 × 90 mm. సమాధానం: B.
-
Question 25 ప్రశ్న 25Answer: C. The grouped dimensions satisfy the dimensional limits, but the lot fails the Class 17.5 individual-strength requirement. సమాధానం: C.