Please keep at least one language enabled. || కనీసం ఒక భాషను ఎంచుకోండి.
Question 1
ప్రశ్న 1
A public building is to have exposed brick masonry on its external elevation, and the architect wants the brick surface itself to provide the finished appearance without routine plastering. Which brick type is the most appropriate primary choice?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Burnt clay facing bricks are specifically manufactured for exposed masonry where the brick itself forms the visible finish.
• Their dimensional regularity, surface texture, sound burning and appearance are important because plaster or rendering is not intended to conceal the masonry face.
• Common burnt clay bricks may be suitable for general masonry, but their strength classification alone does not guarantee the appearance characteristics expected from a facing product.
• A hollow brick with keyed faces is intended to receive plaster or rendering and therefore does not best satisfy the stated architectural requirement.
• Heavy-duty bricks are selected primarily for severe strength and durability demands rather than for providing an exposed architectural finish, so Option B is the most appropriate choice.
• Their dimensional regularity, surface texture, sound burning and appearance are important because plaster or rendering is not intended to conceal the masonry face.
• Common burnt clay bricks may be suitable for general masonry, but their strength classification alone does not guarantee the appearance characteristics expected from a facing product.
• A hollow brick with keyed faces is intended to receive plaster or rendering and therefore does not best satisfy the stated architectural requirement.
• Heavy-duty bricks are selected primarily for severe strength and durability demands rather than for providing an exposed architectural finish, so Option B is the most appropriate choice.
వివరణ:
Question 2
ప్రశ్న 2
Match the brick product with the Indian Standard that specifically covers it:
1. Common burnt clay building bricks
2. Burnt clay facing bricks
3. Burnt clay hollow bricks for walls and partitions
4. Burnt clay perforated building bricks
P. IS 3952:2013
Q. IS 2222:1991
R. IS 1077:2025
S. IS 2691:2017
1. Common burnt clay building bricks
2. Burnt clay facing bricks
3. Burnt clay hollow bricks for walls and partitions
4. Burnt clay perforated building bricks
P. IS 3952:2013
Q. IS 2222:1991
R. IS 1077:2025
S. IS 2691:2017
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 is the specification for common burnt clay building bricks.
• IS 2691:2017 covers burnt clay facing bricks intended for exposed masonry faces.
• IS 3952:2013 covers burnt clay hollow bricks for walls and partitions.
• IS 2222:1991 covers burnt clay perforated building bricks, which are a distinct product category from hollow clay bricks.
• Therefore the correct association is 1-R, 2-S, 3-P and 4-Q, making Option A the only correct combination.
• IS 2691:2017 covers burnt clay facing bricks intended for exposed masonry faces.
• IS 3952:2013 covers burnt clay hollow bricks for walls and partitions.
• IS 2222:1991 covers burnt clay perforated building bricks, which are a distinct product category from hollow clay bricks.
• Therefore the correct association is 1-R, 2-S, 3-P and 4-Q, making Option A the only correct combination.
వివరణ:
Question 3
ప్రశ్న 3
Which statement best distinguishes a burnt clay perforated brick from an ordinary solid common burnt clay brick for engineering selection?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• A burnt clay perforated brick contains intentional perforations passing through the thickness of the unit, unlike an essentially solid common brick.
• The perforations reduce the quantity of solid ceramic material for comparable external dimensions and therefore can reduce unit mass.
• The air spaces associated with the perforated geometry also improve thermal insulation relative to an otherwise comparable solid clay unit.
• Perforation does not automatically make the brick stronger than every common brick because strength depends on material quality, geometry and the applicable product class.
• Perforated building bricks are not defined by frog depth and are not refractory products merely because they contain voids, so Option B is correct.
• The perforations reduce the quantity of solid ceramic material for comparable external dimensions and therefore can reduce unit mass.
• The air spaces associated with the perforated geometry also improve thermal insulation relative to an otherwise comparable solid clay unit.
• Perforation does not automatically make the brick stronger than every common brick because strength depends on material quality, geometry and the applicable product class.
• Perforated building bricks are not defined by frog depth and are not refractory products merely because they contain voids, so Option B is correct.
వివరణ:
Question 4
ప్రశ్న 4
Under the classification used for burnt clay hollow bricks for walls and partitions, which type has both principal faces smooth and is suitable for use without plastering or rendering on either side?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Type B hollow clay bricks have both principal faces smooth.
• Their smooth faces make them suitable for use without plastering or rendering on either side when the wall design permits an exposed finish.
• Type A units have both faces keyed, which is appropriate when plaster or rendering is to be applied to both sides.
• Type C units have one face keyed and the other face smooth, allowing different finishes on the two sides.
• The stated requirement therefore corresponds to Type B, making Option D correct.
• Their smooth faces make them suitable for use without plastering or rendering on either side when the wall design permits an exposed finish.
• Type A units have both faces keyed, which is appropriate when plaster or rendering is to be applied to both sides.
• Type C units have one face keyed and the other face smooth, allowing different finishes on the two sides.
• The stated requirement therefore corresponds to Type B, making Option D correct.
వివరణ:
Question 5
ప్రశ్న 5
Which statement is correct regarding heavy-duty burnt clay building bricks under the applicable IS 2180 specification?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Heavy-duty burnt clay building bricks form a separate high-strength product category under IS 2180.
• They are intended for demanding engineering situations in which strength, durability and low absorption are important selection considerations.
• Their engineering classification is based on compressive-strength requirements rather than merely on colour or surface texture.
• They are distinct from facing bricks, whose defining function is exposed architectural masonry, and from hollow clay bricks used for wall and partition applications.
• Therefore Option C correctly describes the purpose and basis of classification of heavy-duty burnt clay bricks.
• They are intended for demanding engineering situations in which strength, durability and low absorption are important selection considerations.
• Their engineering classification is based on compressive-strength requirements rather than merely on colour or surface texture.
• They are distinct from facing bricks, whose defining function is exposed architectural masonry, and from hollow clay bricks used for wall and partition applications.
• Therefore Option C correctly describes the purpose and basis of classification of heavy-duty burnt clay bricks.
వివరణ:
Question 6
ప్రశ్న 6
According to IS 1077:2025, a common burnt clay building brick designated as Class 20 is classified principally on the basis that its:
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• In IS 1077:2025, the class designation of a common burnt clay building brick corresponds to its specified minimum average compressive strength in N/mm².
• Therefore Class 20 denotes a minimum average compressive strength of 20 N/mm² when tested by the prescribed method.
• The class designation is not a direct statement of water absorption because absorption limits are specified separately and depend on strength class.
• It also does not mean that every individual brick must have exactly 20 N/mm² strength, because individual-brick conformity is governed by a separate lower-limit provision.
• Bulk density is not represented by the class number, so Option A correctly interprets Class 20.
• Therefore Class 20 denotes a minimum average compressive strength of 20 N/mm² when tested by the prescribed method.
• The class designation is not a direct statement of water absorption because absorption limits are specified separately and depend on strength class.
• It also does not mean that every individual brick must have exactly 20 N/mm² strength, because individual-brick conformity is governed by a separate lower-limit provision.
• Bulk density is not represented by the class number, so Option A correctly interprets Class 20.
వివరణ:
Question 7
ప్రశ్న 7
A common burnt clay brick has a dry mass of 2.50 kg and a mass of 2.85 kg after the prescribed 24-hour water-absorption procedure. If the brick belongs to a Class 15 lot under IS 1077:2025, what is the most appropriate conclusion based only on water absorption?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Water absorption by mass is calculated as [(wet mass − dry mass) / dry mass] × 100.
• Substituting the given values gives [(2.85 − 2.50) / 2.50] × 100 = 14 percent.
• Under IS 1077:2025, bricks up to Class 12.5 have a maximum absorption of 20 percent by dry mass, while higher classes, including Class 15, have a maximum of 15 percent.
• The calculated value of 14 percent therefore satisfies the water-absorption requirement applicable to Class 15.
• Conformity to Class 15 also depends on compressive strength, dimensions and the other specified requirements, so passing this one test does not by itself establish full conformity.
• Substituting the given values gives [(2.85 − 2.50) / 2.50] × 100 = 14 percent.
• Under IS 1077:2025, bricks up to Class 12.5 have a maximum absorption of 20 percent by dry mass, while higher classes, including Class 15, have a maximum of 15 percent.
• The calculated value of 14 percent therefore satisfies the water-absorption requirement applicable to Class 15.
• Conformity to Class 15 also depends on compressive strength, dimensions and the other specified requirements, so passing this one test does not by itself establish full conformity.
వివరణ:
Question 8
ప్రశ్న 8
Which matching correctly distinguishes three Indian-standard fly-ash-based brick products?
1. Pulverized fuel ash-lime bricks
2. Burnt clay fly ash building bricks
3. Pulverized fuel ash-cement bricks
P. IS 13757:1993
Q. IS 16720:2018
R. IS 12894:2002
1. Pulverized fuel ash-lime bricks
2. Burnt clay fly ash building bricks
3. Pulverized fuel ash-cement bricks
P. IS 13757:1993
Q. IS 16720:2018
R. IS 12894:2002
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 12894:2002 is the specification for pulverized fuel ash-lime bricks.
• IS 13757:1993 specifically covers burnt clay fly ash building bricks.
• IS 16720:2018 covers pulverized fuel ash-cement bricks, in which cement provides the hydraulic binding action.
• These products should not be treated as interchangeable merely because all of them use fly ash, because their constituent systems and manufacturing routes differ.
• The correct mapping is therefore 1-R, 2-P and 3-Q, which corresponds to Option B.
• IS 13757:1993 specifically covers burnt clay fly ash building bricks.
• IS 16720:2018 covers pulverized fuel ash-cement bricks, in which cement provides the hydraulic binding action.
• These products should not be treated as interchangeable merely because all of them use fly ash, because their constituent systems and manufacturing routes differ.
• The correct mapping is therefore 1-R, 2-P and 3-Q, which corresponds to Option B.
వివరణ:
Question 9
ప్రశ్న 9
A manufacturer produces bricks from pulverized fuel ash as a major constituent, cement, aggregate and water; the shaped units are then allowed to harden and are cured. Which product description best fits this manufacturing route?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Pulverized fuel ash-cement bricks are manufactured using pulverized fuel ash, cement, aggregate and water, with chemical admixtures permitted where required.
• Cement supplies the hydraulic binding action, while the fly ash also participates in pozzolanic reactions in the presence of moisture.
• The mixture is moulded, demoulded after sufficient hardening and then cured rather than being defined by kiln firing of a clay body.
• Common, facing and heavy-duty burnt clay bricks are ceramic products whose manufacture fundamentally involves forming and firing suitable clay material.
• Therefore Option B correctly identifies the product from the stated ingredients and curing process.
• Cement supplies the hydraulic binding action, while the fly ash also participates in pozzolanic reactions in the presence of moisture.
• The mixture is moulded, demoulded after sufficient hardening and then cured rather than being defined by kiln firing of a clay body.
• Common, facing and heavy-duty burnt clay bricks are ceramic products whose manufacture fundamentally involves forming and firing suitable clay material.
• Therefore Option B correctly identifies the product from the stated ingredients and curing process.
వివరణ:
Question 10
ప్రశ్న 10
A project requires a dense, high-strength burnt-clay masonry unit for severe engineering service, and the specified compressive-strength level lies outside the less-than-40 N/mm² scope of common burnt clay bricks in IS 1077:2025. Which product family should be specified?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 limits its scope to common burnt clay building bricks having compressive strength below 40 N/mm².
• For higher-strength burnt-clay bricks used in demanding engineering service, the appropriate product family is heavy-duty burnt clay building bricks covered by IS 2180.
• Facing bricks are distinguished primarily by their exposed-face quality and are not selected merely as a substitute for a high-strength heavy-duty product.
• Hollow partition bricks and pulverized fuel ash-cement bricks are different masonry-unit categories with different material systems and performance specifications.
• Therefore Option B is the technically appropriate selection for the stated high-strength burnt-clay application.
• For higher-strength burnt-clay bricks used in demanding engineering service, the appropriate product family is heavy-duty burnt clay building bricks covered by IS 2180.
• Facing bricks are distinguished primarily by their exposed-face quality and are not selected merely as a substitute for a high-strength heavy-duty product.
• Hollow partition bricks and pulverized fuel ash-cement bricks are different masonry-unit categories with different material systems and performance specifications.
• Therefore Option B is the technically appropriate selection for the stated high-strength burnt-clay application.
వివరణ:
Question 11
ప్రశ్న 11
For an internal partition, the designer's principal objectives are reduced dead load and improved thermal insulation compared with a conventional solid clay masonry unit. Which brick type is most directly aligned with these objectives?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Hollow clay bricks contain substantial voids and are specifically produced for wall and partition applications.
• The voids reduce the quantity of solid ceramic material and therefore reduce unit mass compared with a comparable solid clay unit.
• Air spaces within the units also improve thermal insulation, which is advantageous in partition and enclosure construction.
• Heavy-duty bricks emphasize high strength, while paving and sewer bricks are specialized for service conditions unrelated to an ordinary internal partition.
• Subject to satisfying the structural, fire and other requirements of the wall system, the hollow clay brick is the most appropriate choice among the options.
• The voids reduce the quantity of solid ceramic material and therefore reduce unit mass compared with a comparable solid clay unit.
• Air spaces within the units also improve thermal insulation, which is advantageous in partition and enclosure construction.
• Heavy-duty bricks emphasize high strength, while paving and sewer bricks are specialized for service conditions unrelated to an ordinary internal partition.
• Subject to satisfying the structural, fire and other requirements of the wall system, the hollow clay brick is the most appropriate choice among the options.
వివరణ:
Question 12
ప్రశ్న 12
Consider the following statements about burnt clay facing bricks:
1. They are intended for masonry faces that may remain exposed without further surface protection.
2. Their surface quality and dimensional regularity are particularly important because the masonry face remains visible.
3. Their designation as facing bricks means strength and other physical requirements can be ignored.
4. They are covered by a separate Indian Standard from common burnt clay building bricks.
Which statements are correct?
1. They are intended for masonry faces that may remain exposed without further surface protection.
2. Their surface quality and dimensional regularity are particularly important because the masonry face remains visible.
3. Their designation as facing bricks means strength and other physical requirements can be ignored.
4. They are covered by a separate Indian Standard from common burnt clay building bricks.
Which statements are correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Statement 1 is correct because facing bricks are specifically intended for use in exposed masonry faces without relying on a later surface finish for protection or appearance.
• Statement 2 is correct because visible texture, shape, edges and dimensional regularity directly influence the quality of exposed brickwork.
• Statement 3 is incorrect because a facing function does not remove the need to satisfy applicable physical and performance requirements.
• Statement 4 is correct because burnt clay facing bricks are covered by IS 2691:2017, whereas common burnt clay building bricks are covered by IS 1077:2025.
• Therefore Statements 1, 2 and 4 are correct, making Option B the unique answer.
• Statement 2 is correct because visible texture, shape, edges and dimensional regularity directly influence the quality of exposed brickwork.
• Statement 3 is incorrect because a facing function does not remove the need to satisfy applicable physical and performance requirements.
• Statement 4 is correct because burnt clay facing bricks are covered by IS 2691:2017, whereas common burnt clay building bricks are covered by IS 1077:2025.
• Therefore Statements 1, 2 and 4 are correct, making Option B the unique answer.
వివరణ:
Question 13
ప్రశ్న 13
Which comparison between burnt clay perforated bricks and burnt clay hollow bricks is the most accurate?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Burnt clay perforated bricks and burnt clay hollow bricks are related voided masonry products, but they are not the same standardized product.
• Perforated bricks have intentional perforations passing through the thickness of the brick and are covered by IS 2222.
• Hollow bricks for walls and partitions are separately covered by IS 3952 and are characterized by a substantial hollow volume within the unit.
• Both forms can reduce masonry mass and improve thermal insulation relative to comparable solid clay masonry, but their geometrical requirements and product specifications differ.
• Therefore Option B correctly distinguishes the two categories without treating the terms as interchangeable.
• Perforated bricks have intentional perforations passing through the thickness of the brick and are covered by IS 2222.
• Hollow bricks for walls and partitions are separately covered by IS 3952 and are characterized by a substantial hollow volume within the unit.
• Both forms can reduce masonry mass and improve thermal insulation relative to comparable solid clay masonry, but their geometrical requirements and product specifications differ.
• Therefore Option B correctly distinguishes the two categories without treating the terms as interchangeable.
వివరణ:
Question 14
ప్రశ్న 14
A wall is to be plastered on the room side but left as a smooth exposed clay surface on the corridor side. Under the Type A/Type B/Type C face classification of burnt clay hollow bricks, which type is the logical choice?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Type C hollow clay bricks have one face keyed and the other face smooth.
• The keyed face provides a suitable mechanical surface for plaster or rendering on the side that is to receive a finish.
• The smooth face can remain exposed where plastering or rendering is not required, subject to the required architectural quality.
• Type A has both faces keyed and Type B has both faces smooth, so neither matches a wall requiring different treatments on its two sides as directly as Type C.
• Option C therefore follows directly from the face configuration required by the stated application.
• The keyed face provides a suitable mechanical surface for plaster or rendering on the side that is to receive a finish.
• The smooth face can remain exposed where plastering or rendering is not required, subject to the required architectural quality.
• Type A has both faces keyed and Type B has both faces smooth, so neither matches a wall requiring different treatments on its two sides as directly as Type C.
• Option C therefore follows directly from the face configuration required by the stated application.
వివరణ:
Question 15
ప్రశ్న 15
Consider the following statements about fly-ash-based bricks used in India:
1. All fly-ash-based bricks are manufactured by exactly the same process.
2. Pulverized fuel ash-lime bricks and pulverized fuel ash-cement bricks are covered by different Indian Standards.
3. Burnt clay fly ash building bricks constitute a distinct standardized product from pulverized fuel ash-cement bricks.
4. The presence of fly ash alone is insufficient to identify the applicable brick standard.
Which statements are correct?
1. All fly-ash-based bricks are manufactured by exactly the same process.
2. Pulverized fuel ash-lime bricks and pulverized fuel ash-cement bricks are covered by different Indian Standards.
3. Burnt clay fly ash building bricks constitute a distinct standardized product from pulverized fuel ash-cement bricks.
4. The presence of fly ash alone is insufficient to identify the applicable brick standard.
Which statements are correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Statement 1 is incorrect because fly-ash-based bricks include more than one material system and manufacturing route.
• Statement 2 is correct because pulverized fuel ash-lime bricks are covered by IS 12894:2002, while pulverized fuel ash-cement bricks are covered by IS 16720:2018.
• Statement 3 is correct because burnt clay fly ash building bricks are separately covered by IS 13757:1993.
• Statement 4 is also correct because the binder system, presence of clay and whether the unit is fired or cured determine which product specification applies.
• Hence Statements 2, 3 and 4 are correct and Option C is the only valid combination.
• Statement 2 is correct because pulverized fuel ash-lime bricks are covered by IS 12894:2002, while pulverized fuel ash-cement bricks are covered by IS 16720:2018.
• Statement 3 is correct because burnt clay fly ash building bricks are separately covered by IS 13757:1993.
• Statement 4 is also correct because the binder system, presence of clay and whether the unit is fired or cured determine which product specification applies.
• Hence Statements 2, 3 and 4 are correct and Option C is the only valid combination.
వివరణ:
Question 16
ప్రశ్న 16
Match each brick type with the application or selection priority most characteristic of it:
1. Facing brick
2. Heavy-duty burnt clay brick
3. Hollow clay brick
4. Burnt clay paving brick
P. Reduced-mass wall or partition with useful thermal insulation
Q. Exposed masonry appearance without routine rendering
R. Pavement surface subjected to traffic and wear
S. High-strength demanding engineering masonry
1. Facing brick
2. Heavy-duty burnt clay brick
3. Hollow clay brick
4. Burnt clay paving brick
P. Reduced-mass wall or partition with useful thermal insulation
Q. Exposed masonry appearance without routine rendering
R. Pavement surface subjected to traffic and wear
S. High-strength demanding engineering masonry
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Facing bricks are selected when the masonry face itself is intended to remain visible, so 1-Q is the appropriate association.
• Heavy-duty burnt clay bricks are intended for demanding high-strength engineering service, giving 2-S.
• Hollow clay bricks reduce the quantity of solid material and provide useful thermal insulation in wall and partition applications, giving 3-P.
• Burnt clay paving bricks are specialized for paving service where traffic and wear resistance are important, giving 4-R.
• The complete correct matching is therefore 1-Q, 2-S, 3-P and 4-R, which corresponds to Option A.
• Heavy-duty burnt clay bricks are intended for demanding high-strength engineering service, giving 2-S.
• Hollow clay bricks reduce the quantity of solid material and provide useful thermal insulation in wall and partition applications, giving 3-P.
• Burnt clay paving bricks are specialized for paving service where traffic and wear resistance are important, giving 4-R.
• The complete correct matching is therefore 1-Q, 2-S, 3-P and 4-R, which corresponds to Option A.
వివరణ:
Question 17
ప్రశ్న 17
Which set contains only correctly matched currently applicable Indian brick specifications?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 is the sixth-revision specification for common burnt clay building bricks.
• IS 2691:2017 is the specification for burnt clay facing bricks.
• IS 3952:2013 is the specification for burnt clay hollow bricks for walls and partitions.
• The other options interchange these product categories or incorrectly describe the superseded 1992 edition of IS 1077 as the current sixth revision.
• Therefore only Option A contains three correctly matched currently applicable specifications.
• IS 2691:2017 is the specification for burnt clay facing bricks.
• IS 3952:2013 is the specification for burnt clay hollow bricks for walls and partitions.
• The other options interchange these product categories or incorrectly describe the superseded 1992 edition of IS 1077 as the current sixth revision.
• Therefore only Option A contains three correctly matched currently applicable specifications.
వివరణ:
Question 18
ప్రశ్న 18
Under IS 1077:2025, which statement about frogs in common burnt clay building bricks is correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• IS 1077:2025 distinguishes the frog requirement according to the brick's manufacturing method and height.
• Hand-moulded bricks of the specified 90 mm or 70 mm height are required to have a frog 10 mm to 20 mm deep on one flat side.
• Bricks of 40 mm height and bricks made by extrusion may be produced without frogs.
• The presence or absence of a frog does not define the compressive-strength class because class designation is based on minimum average compressive strength.
• Therefore Option B correctly states the current provision and avoids the false absolute claim that every common brick must have a frog.
• Hand-moulded bricks of the specified 90 mm or 70 mm height are required to have a frog 10 mm to 20 mm deep on one flat side.
• Bricks of 40 mm height and bricks made by extrusion may be produced without frogs.
• The presence or absence of a frog does not define the compressive-strength class because class designation is based on minimum average compressive strength.
• Therefore Option B correctly states the current provision and avoids the false absolute claim that every common brick must have a frog.
వివరణ:
Question 19
ప్రశ్న 19
A burnt clay brick is required to have a specified compressive-strength level of 40 N/mm² for a demanding engineering application. Which statement is technically correct in relation 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 classification table therefore runs up to Class 35 and does not contain a Class 40 common-brick designation.
• A requirement at the 40 N/mm² level belongs to the high-strength heavy-duty burnt clay brick category addressed by IS 2180.
• Facing and hollow brick classifications are based on different product characteristics and cannot be substituted merely because a high compressive strength is required.
• Hence Option B correctly interprets the boundary between the common-brick and heavy-duty-brick specifications.
• Its classification table therefore runs up to Class 35 and does not contain a Class 40 common-brick designation.
• A requirement at the 40 N/mm² level belongs to the high-strength heavy-duty burnt clay brick category addressed by IS 2180.
• Facing and hollow brick classifications are based on different product characteristics and cannot be substituted merely because a high compressive strength is required.
• Hence Option B correctly interprets the boundary between the common-brick and heavy-duty-brick specifications.
వివరణ:
Question 20
ప్రశ్న 20
Assertion (A): Hollow and perforated clay masonry units can be advantageous when reducing wall self-weight is important.
Reason (R): Introducing intentional voids reduces the volume of solid ceramic material in a unit of given external dimensions.
Choose the correct option.
Reason (R): Introducing intentional voids reduces the volume of solid ceramic material in a unit of given external dimensions.
Choose the correct option.
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• The Assertion is true because hollow and perforated clay units generally contain less solid material than an equivalent fully solid clay unit of the same external size.
• The Reason is also true because intentional hollows or perforations occupy part of the gross unit volume that would otherwise be solid ceramic material.
• With similar material density and comparable external dimensions, reducing the solid volume tends to reduce the unit mass and hence the masonry dead load.
• The Reason therefore directly explains the physical mechanism behind the Assertion rather than merely stating an unrelated property.
• Accordingly both A and R are true and R correctly explains A, so Option A is correct.
• The Reason is also true because intentional hollows or perforations occupy part of the gross unit volume that would otherwise be solid ceramic material.
• With similar material density and comparable external dimensions, reducing the solid volume tends to reduce the unit mass and hence the masonry dead load.
• The Reason therefore directly explains the physical mechanism behind the Assertion rather than merely stating an unrelated property.
• Accordingly both A and R are true and R correctly explains A, so Option A is correct.
వివరణ:
Question 21
ప్రశ్న 21
Which statement about selecting hollow or perforated bricks for thermal performance is the most technically sound?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Voids in hollow or perforated masonry units can reduce conductive heat flow through the unit and therefore improve thermal resistance compared with a similar solid unit.
• This thermal advantage does not eliminate the need to verify the unit's strength and the structural requirements of the wall.
• Moisture exposure, workmanship, mortar joints, wall thickness and detailing also influence the actual performance of a masonry assembly.
• Air does not have zero thermal conductivity, and convection or thermal bridging can also contribute to heat transfer.
• Therefore Option A gives the balanced engineering selection principle rather than treating thermal performance as the only design criterion.
• This thermal advantage does not eliminate the need to verify the unit's strength and the structural requirements of the wall.
• Moisture exposure, workmanship, mortar joints, wall thickness and detailing also influence the actual performance of a masonry assembly.
• Air does not have zero thermal conductivity, and convection or thermal bridging can also contribute to heat transfer.
• Therefore Option A gives the balanced engineering selection principle rather than treating thermal performance as the only design criterion.
వివరణ:
Question 22
ప్రశ్న 22
Which of the following is the LEAST defensible substitution in a specification when the original requirement is for a specialized brick type?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Two bricks being made from burnt clay does not make them functionally interchangeable.
• A facing brick is intended to provide a satisfactory exposed masonry surface, whereas an ordinary common brick may not provide the same controlled appearance and facing characteristics.
• Substitution therefore requires checking the product specification, dimensions, physical properties, durability, structural role and finish requirements rather than merely matching the base material.
• The other listed choices explicitly involve selecting a product for an appropriate application after verifying its relevant performance or specification.
• Consequently replacing a facing brick with an ordinary common brick solely because both are burnt clay is the least defensible substitution, making Option A correct.
• A facing brick is intended to provide a satisfactory exposed masonry surface, whereas an ordinary common brick may not provide the same controlled appearance and facing characteristics.
• Substitution therefore requires checking the product specification, dimensions, physical properties, durability, structural role and finish requirements rather than merely matching the base material.
• The other listed choices explicitly involve selecting a product for an appropriate application after verifying its relevant performance or specification.
• Consequently replacing a facing brick with an ordinary common brick solely because both are burnt clay is the least defensible substitution, making Option A correct.
వివరణ:
Question 23
ప్రశ్న 23
Consider the following statements:
1. Common burnt clay bricks are classified under IS 1077:2025 by minimum average compressive strength.
2. Heavy-duty burnt clay bricks constitute a separate standardized product category under IS 2180.
3. Facing bricks are selected only for strength and their visible surface quality is irrelevant.
4. Hollow and perforated clay units may be selected partly to reduce masonry mass.
Which statements are correct?
1. Common burnt clay bricks are classified under IS 1077:2025 by minimum average compressive strength.
2. Heavy-duty burnt clay bricks constitute a separate standardized product category under IS 2180.
3. Facing bricks are selected only for strength and their visible surface quality is irrelevant.
4. Hollow and perforated clay units may be selected partly to reduce masonry mass.
Which statements are correct?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Statement 1 is correct because IS 1077:2025 classifies common burnt clay building bricks according to specified minimum average compressive strength.
• Statement 2 is correct because heavy-duty burnt clay building bricks are addressed separately under IS 2180 rather than being ordinary classes within IS 1077:2025.
• Statement 3 is incorrect because surface quality, texture, shape and dimensional regularity are central considerations for bricks intended to remain exposed as facing masonry.
• Statement 4 is correct because intentional voids reduce the amount of solid ceramic material and can reduce unit mass in hollow and perforated products.
• Therefore Statements 1, 2 and 4 are correct, so Option B is the unique answer.
• Statement 2 is correct because heavy-duty burnt clay building bricks are addressed separately under IS 2180 rather than being ordinary classes within IS 1077:2025.
• Statement 3 is incorrect because surface quality, texture, shape and dimensional regularity are central considerations for bricks intended to remain exposed as facing masonry.
• Statement 4 is correct because intentional voids reduce the amount of solid ceramic material and can reduce unit mass in hollow and perforated products.
• Therefore Statements 1, 2 and 4 are correct, so Option B is the unique answer.
వివరణ:
Question 24
ప్రశ్న 24
A contractor proposes a hollow clay brick because it is lighter, while the designer requires a highly loaded masonry element. What is the best engineering response?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Reduced unit mass is a potential advantage of hollow clay masonry, but it does not by itself establish adequate compressive capacity for a highly loaded wall.
• Conversely, it is also incorrect to claim that every hollow unit is incapable of carrying load because suitability depends on the product, geometry, strength and masonry design.
• The designer must evaluate the declared or tested properties of the specific unit together with the applicable masonry design requirements.
• Mortar affects masonry behaviour, but it does not make the strength and geometry of the brick irrelevant.
• Therefore the correct engineering response is to verify the specific hollow unit and wall system against the required structural performance before accepting the substitution.
• Conversely, it is also incorrect to claim that every hollow unit is incapable of carrying load because suitability depends on the product, geometry, strength and masonry design.
• The designer must evaluate the declared or tested properties of the specific unit together with the applicable masonry design requirements.
• Mortar affects masonry behaviour, but it does not make the strength and geometry of the brick irrelevant.
• Therefore the correct engineering response is to verify the specific hollow unit and wall system against the required structural performance before accepting the substitution.
వివరణ:
Question 25
ప్రశ్న 25
A pulverized fuel ash-cement brick is designated as Class 12.5 under IS 16720:2018. What does the class designation principally represent?
Select an option first. || ముందుగా ఒక సమాధానాన్ని ఎంచుకోండి.
Explanation:
• Under IS 16720:2018, pulverized fuel ash-cement bricks are classified on the basis of average 28-day wet compressive strength.
• Therefore a Class 12.5 brick has a specified minimum average 28-day wet compressive strength of 12.5 N/mm².
• The class number is not a statement of cement percentage because constituent proportions are governed separately by material and manufacturing requirements.
• It is also not a density or water-absorption value, since those properties are controlled by separate provisions of the specification.
• Consequently Option D correctly interprets the engineering meaning of the class designation.
• Therefore a Class 12.5 brick has a specified minimum average 28-day wet compressive strength of 12.5 N/mm².
• The class number is not a statement of cement percentage because constituent proportions are governed separately by material and manufacturing requirements.
• It is also not a density or water-absorption value, since those properties are controlled by separate provisions of the specification.
• Consequently Option D correctly interprets the engineering meaning of the class designation.
వివరణ:
Answer Key సమాధానాల పట్టిక
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Question 1 ప్రశ్న 1Answer: B. Burnt clay facing brick సమాధానం: B.
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Question 2 ప్రశ్న 2Answer: A. 1-R, 2-S, 3-P, 4-Q సమాధానం: A.
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Question 3 ప్రశ్న 3Answer: B. A perforated brick contains intentional through-perforations that reduce the amount of solid material and can reduce unit mass while improving thermal insulation. సమాధానం: B.
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Question 4 ప్రశ్న 4Answer: D. Type B సమాధానం: D.
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Question 5 ప్రశ్న 5Answer: C. They are a separate high-strength burnt-clay brick category intended for demanding engineering applications and classified using compressive-strength requirements. సమాధానం: C.
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Question 6 ప్రశ్న 6Answer: A. minimum average compressive strength is 20 N/mm² సమాధానం: A.
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Question 7 ప్రశ్న 7Answer: B. Water absorption is 14%, so it satisfies the Class 15 absorption limit, but this alone does not establish full conformity of the lot. సమాధానం: B.
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Question 8 ప్రశ్న 8Answer: B. 1-R, 2-P, 3-Q సమాధానం: B.
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Question 9 ప్రశ్న 9Answer: B. Pulverized fuel ash-cement brick సమాధానం: B.
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Question 10 ప్రశ్న 10Answer: B. Heavy-duty burnt clay building bricks under IS 2180 సమాధానం: B.
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Question 11 ప్రశ్న 11Answer: A. Burnt clay hollow brick for walls and partitions సమాధానం: A.
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Question 12 ప్రశ్న 12Answer: B. 1, 2 and 4 only సమాధానం: B.
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Question 13 ప్రశ్న 13Answer: B. Perforated bricks have deliberate perforations passing through their thickness, whereas hollow bricks form a separately specified wall-and-partition product in which the volume of holes exceeds the prescribed proportion of the unit volume. సమాధానం: B.
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Question 14 ప్రశ్న 14Answer: C. Type C, because one face is keyed and the other is smooth సమాధానం: C.
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Question 15 ప్రశ్న 15Answer: C. 2, 3 and 4 only సమాధానం: C.
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Question 16 ప్రశ్న 16Answer: A. 1-Q, 2-S, 3-P, 4-R సమాధానం: A.
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Question 17 ప్రశ్న 17Answer: A. IS 1077:2025 — common burnt clay building bricks; IS 2691:2017 — burnt clay facing bricks; IS 3952:2013 — burnt clay hollow bricks for walls and partitions సమాధానం: A.
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Question 18 ప్రశ్న 18Answer: B. Hand-moulded bricks of the specified 90 mm or 70 mm height are provided with a frog 10 mm to 20 mm deep, while 40 mm high bricks and extruded bricks may be without frogs. సమాధానం: B.
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Question 19 ప్రశ్న 19Answer: B. IS 1077:2025 does not provide a Class 40 common-brick designation; the higher-strength requirement should be addressed under the heavy-duty burnt clay brick specification, IS 2180. సమాధానం: B.
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Question 20 ప్రశ్న 20Answer: A. Both A and R are true, and R is the correct explanation of A. సమాధానం: A.
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Question 21 ప్రశ్న 21Answer: A. Voids can improve thermal resistance, but structural capacity, moisture exposure, detailing and the applicable product specification must still be checked. సమాధానం: A.
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Question 22 ప్రశ్న 22Answer: A. Replacing a facing brick with an ordinary common brick solely because both are made from burnt clay సమాధానం: A.
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Question 23 ప్రశ్న 23Answer: B. 1, 2 and 4 only సమాధానం: B.
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Question 24 ప్రశ్న 24Answer: C. Check whether the particular hollow unit and masonry system satisfy the specified structural capacity and applicable standard before accepting the substitution. సమాధానం: C.
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Question 25 ప్రశ్న 25Answer: D. The minimum average 28-day wet compressive strength is 12.5 N/mm². సమాధానం: D.