A good building stone should have which of the following qualities?
\ni. Uniform texture\nii. Strength\niii. Fire resistance\niv. Hardness
Why: A good building stone must possess all listed qualities: uniform texture for structural integrity, strength (60-200 N/mm²) for load-bearing, fire resistance (up to 800°C), and hardness for durability in floors and pavements. All options i, ii, iii, and iv are essential characteristics as per standard building material specifications[1].
Question 2
PYQ1.0 marks
Which of the following stone is best suited for construction of piers and abutments of a railway bridge?
Why: Granite is the best suited for construction of piers and abutments of railway bridges due to its **high compressive strength** (typically >100 MPa), **excellent durability** against weathering and abrasion, and **low porosity** which prevents water ingress and freeze-thaw damage. These properties ensure long-term structural stability under heavy dynamic loads and harsh environmental conditions. Sandstone and limestone have lower strength and higher porosity, while quartzite though strong is less commonly used for such applications[3][4].
Question 3
PYQ1.0 marks
The predominant constituent which is responsible for strength in granite is:
Why: **Quartz** provides the primary strength to granite due to its exceptional hardness (Mohs scale 7) and high compressive strength. Quartz crystals interlock to form a dense, durable matrix resistant to crushing and abrasion. Feldspar provides bulk but is softer, while mica contributes to cleavage planes that can weaken the stone under certain loading conditions[3][4].
Question 4
PYQ1.0 marks
Crushing strength of a good building stone should be more than:
Why: A good building stone must have **crushing strength >100 MPa** to safely bear structural loads in construction. This ensures **durability** under compressive forces and resistance to failure. Stones like granite (120-250 MPa) and basalt meet this criterion, while weaker stones like limestone (<100 MPa) are unsuitable for load-bearing applications[3][21].
Question 5
PYQ1.0 marks
Granite is not suitable for ordinary building purpose because:
Why: Granite's **high cost** due to difficult quarrying, expensive dressing, and transportation makes it uneconomical for ordinary buildings. Despite excellent properties like high strength (>150 MPa), durability, and fire resistance, its **poor workability** (hard to cut/shape) further increases costs. It's reserved for premium applications like bridges and monuments[3][4][18].
Question 6
PYQ1.0 marks
Which natural material is chemically classified as metamorphic rock?
Why: **Marble** is a metamorphic rock formed by recrystallization of limestone under heat and pressure, resulting in interlocking calcite crystals that enhance strength and durability. Granite (igneous), basalt (igneous), and limestone (sedimentary) do not undergo this metamorphic transformation. Marble's uniform texture makes it ideal for decorative uses despite moderate strength[2].
Question 7
PYQ1.0 marks
Specific gravity for most of the building stones lies between:
Why: Most building stones have **specific gravity 2.5-3.0**, indicating dense mineral composition suitable for structural stability. Granite (2.6-2.8), sandstone (2.2-2.7), and limestone (2.3-2.7) fall in this range. Lower values indicate porous/light stones unsuitable for heavy construction[3][22].
Question 8
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Which of the following is a common example of an igneous stone used in construction?
Why: Granite is an igneous stone formed from the slow crystallization of magma and is widely used in construction due to its strength and durability.
Question 9
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Igneous stones are primarily formed by which geological process?
Why: Igneous stones form when molten magma cools and solidifies either beneath the earth's surface or after volcanic eruption.
Question 10
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Which characteristic best distinguishes igneous stones from sedimentary stones?
Why: Igneous stones are formed by the cooling and solidification of magma, whereas sedimentary stones are formed by deposition and compaction of sediments.
Question 11
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Which igneous stone is most suitable for heavy construction works due to its high compressive strength and durability?
Why: Granite has high compressive strength and durability, making it suitable for heavy construction, unlike pumice which is lightweight and porous.
Question 12
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Which of the following properties of igneous stones makes them resistant to weathering and suitable for external cladding?
Why: Low water absorption reduces weathering and decay, making igneous stones like granite suitable for external cladding.
Question 13
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Which igneous stone is known for its fine-grained texture and is commonly used in road construction and as aggregate?
Why: Basalt is a fine-grained igneous stone widely used as crushed stone in road construction and as aggregate due to its hardness and durability.
Question 14
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Which of the following is a typical sedimentary stone used in building construction?
Why: Sandstone is a sedimentary stone formed by the compaction of sand particles and is commonly used in construction.
Question 15
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Sedimentary stones are primarily formed by which process?
Why: Sedimentary stones form through deposition, compaction, and cementation of sediments over time.
Question 16
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Which property of sedimentary stones generally limits their use in heavy load-bearing structures?
Why: Sedimentary stones often have high porosity, which reduces strength and durability, limiting their use in heavy load-bearing applications.
Question 17
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Which sedimentary stone is preferred for ornamental work due to its fine grain and ease of carving?
Why: Limestone has a fine grain and is relatively soft, making it suitable for ornamental and sculptural work.
Question 18
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Which sedimentary stone is most suitable for construction in humid climates due to its low water absorption and durability?
Why: Sandstone generally has lower water absorption compared to other sedimentary stones like shale, making it more durable in humid climates.
Question 19
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Which sedimentary stone is formed by the cementation of rounded gravel and pebbles?
Why: Conglomerate is a sedimentary rock formed by the cementation of rounded gravel and pebbles.
Question 20
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Which of the following stones is classified as metamorphic?
Why: Marble is a metamorphic stone formed by the recrystallization of limestone under heat and pressure.
Question 21
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Metamorphic stones are primarily formed by which process?
Why: Metamorphic stones form when existing rocks are subjected to heat and pressure causing physical and chemical changes.
Question 22
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Which metamorphic stone is widely used for flooring and decorative purposes due to its attractive appearance and polishability?
Why: Marble is prized for its aesthetic appeal and ability to take a high polish, making it popular for flooring and decoration.
Question 23
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Slate, a metamorphic stone, is preferred for roofing because of its:
Why: Slate has a foliated structure and natural cleavage planes allowing it to be split into thin sheets ideal for roofing.
Question 24
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Which metamorphic stone is formed by the metamorphism of quartz-rich sandstone and is known for its hardness?
Why: Quartzite forms from the metamorphism of quartz-rich sandstone and is very hard and durable.
Question 25
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Which physical property of stone is defined as the ability to resist water penetration?
Why: Water absorption is the measure of the amount of water a stone can absorb, indicating its resistance to water penetration.
Question 26
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Which physical property of stone affects its weight and is crucial for structural design calculations?
Why: Density is the mass per unit volume of stone and directly affects the weight and load calculations in structures.
Question 27
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Which physical property of stone is most directly related to its durability against weathering and freeze-thaw cycles?
Why: Porosity determines how much water a stone can absorb; higher porosity increases susceptibility to weathering and freeze-thaw damage.
Question 28
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Which physical property of stones is measured by Mohs scale and influences their resistance to abrasion?
Why: Hardness, measured by Mohs scale, indicates a stone's resistance to scratching and abrasion.
Question 29
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Which physical property would you test to determine the suitability of a stone for use in wet environments such as fountains or pools?
Why: Low water absorption is essential for stones used in wet environments to prevent damage and deterioration.
Question 30
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Which mechanical property of stone is defined as the maximum compressive load it can withstand without failure?
Why: Compressive strength is the maximum compressive load a stone can bear before failure, critical for load-bearing applications.
Question 31
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Which mechanical property is most important for stones used in pavements subjected to bending forces?
Why: Flexural strength measures a stone's ability to resist bending and is important for pavements and slabs.
Question 32
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Which mechanical property of stone is generally the lowest and often neglected in structural design due to stone's brittle nature?
Why: Tensile strength of stone is usually very low compared to compressive strength, and stones tend to fail in tension.
Question 33
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If a stone has a compressive strength of 100 MPa and a flexural strength of 10 MPa, what does this indicate about its mechanical behavior?
Why: The stone can withstand high compressive loads but has much lower strength in bending (flexural strength), indicating brittleness under tensile stresses.
Question 34
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Which mechanical property would be most critical when selecting stone for a bridge pier subjected to heavy vertical loads?
Why: Bridge piers primarily experience compressive loads, so compressive strength is the most critical property.
Question 35
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Which of the following is a common example of an igneous stone used in construction?
Why: Granite is a widely used igneous stone known for its durability and strength.
Question 36
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What is the primary formation process of sedimentary stones?
Why: Sedimentary stones form from deposition, compaction, and cementation of sediments.
Question 37
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Which metamorphic stone is commonly used for flooring due to its attractive appearance and durability?
Why: Slate is a metamorphic stone valued for its fine texture and durability, making it suitable for flooring.
Question 38
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Which physical property of stone primarily affects its ability to resist weathering and decay?
Why: Porosity influences how much water a stone can absorb, affecting its weathering resistance.
Question 39
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Which mechanical property of stone is most important for structures subjected to heavy loads?
Why: Compressive strength determines the stone's ability to withstand heavy loads without failure.
Question 40
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Which of the following stones is classified as an igneous rock?
Why: Basalt is an igneous rock formed from rapid cooling of lava at the surface.
Question 41
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Which sedimentary stone is most suitable for use in ornamental architecture due to its ease of carving?
Why: Limestone is soft and easy to carve, making it popular for ornamental work.
Question 42
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Which metamorphic stone is formed by the metamorphism of limestone?
Why: Marble is formed when limestone undergoes metamorphism under heat and pressure.
Question 43
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How does the porosity of a stone affect its durability in construction?
Why: Lower porosity means less water absorption, reducing weathering and increasing durability.
Question 44
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Which mechanical property is tested by applying a tensile load to a stone specimen?
Why: Tensile strength measures the resistance of stone to forces that attempt to pull it apart.
Question 45
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Which igneous stone is preferred for heavy-duty flooring due to its high compressive strength and abrasion resistance?
Why: Basalt has high compressive strength and abrasion resistance, making it suitable for heavy-duty flooring.
Question 46
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Which sedimentary stone is most likely to suffer from rapid weathering in a humid environment due to its high porosity?
Why: Sandstone typically has high porosity, making it susceptible to weathering in humid conditions.
Question 47
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In the context of metamorphic stones, which property is enhanced by the alignment of mineral grains during metamorphism?
Why: Foliation is the planar arrangement of mineral grains caused by pressure during metamorphism.
Question 48
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Which physical property of stone is measured by the Mohs scale?
Why: The Mohs scale measures the hardness of minerals and stones.
Question 49
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A stone with high compressive strength but low tensile strength is most suitable for which type of structural element?
Why: Columns and foundations primarily experience compressive loads, so stones with high compressive strength are ideal.
Question 50
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Which of the following stones is best suited for constructing retaining walls that require good weather resistance and strength?
Why: Granite is strong and weather-resistant, making it suitable for retaining walls.
Question 51
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Which sedimentary rock is primarily composed of calcium carbonate and used extensively in cement manufacturing?
Why: Limestone is mainly calcium carbonate and is a key raw material for cement.
Question 52
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Which metamorphic stone is highly resistant to abrasion and is often used for kitchen countertops?
Why: Quartzite is very hard and abrasion-resistant, making it suitable for countertops.
Question 53
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Which physical property of stone affects its thermal insulation capability in building construction?
Why: Porosity affects the amount of air trapped in stone, influencing thermal insulation.
Question 54
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A stone sample has a compressive strength of 50 MPa and a tensile strength of 5 MPa. For which structural application is this stone most suitable?
Why: High compressive strength and low tensile strength stones are suitable for load-bearing columns.
Question 55
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Which igneous stone is characterized by a glassy texture and is rarely used in construction due to its brittleness?
Why: Obsidian has a glassy texture and is brittle, limiting its use in construction.
Question 56
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A construction engineer is selecting a stone for a coastal bridge foundation subjected to cyclic saltwater exposure and heavy mechanical loading. Considering the stone's mineral composition, porosity, compressive strength, and weathering resistance, which type of stone is most suitable?
A) Granite with low porosity and high quartz content
B) Sandstone with moderate porosity and high feldspar content
C) Marble with high calcite content and low compressive strength
D) Slate with foliated structure and moderate porosity
Why: Step 1: Identify environmental conditions - cyclic saltwater exposure causes chemical weathering and salt crystallization.
Step 2: Assess mineral composition - quartz is chemically inert and resistant to salt attack; feldspar and calcite are more susceptible.
Step 3: Consider porosity - low porosity reduces water ingress and salt crystallization damage.
Step 4: Mechanical loading requires high compressive strength; granite typically has high compressive strength compared to sandstone and marble.
Step 5: Weathering resistance - granite's mineralogy and low porosity make it more durable in coastal conditions.
Therefore, granite with low porosity and high quartz content is most suitable.
Trap options: Sandstone's feldspar weathers chemically; marble's calcite dissolves in acidic conditions; slate's foliation may cause weakness under mechanical loading.
Question 57
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A metamorphic stone with a foliated texture is proposed for flooring in a high-traffic industrial warehouse. Considering its anisotropic mechanical properties, water absorption, and resistance to abrasion, which stone and orientation of placement will optimize durability?
A) Slate with foliation parallel to load direction
B) Schist with foliation perpendicular to load direction
C) Gneiss with random foliation orientation
D) Quartzite with non-foliated texture
Why: Step 1: Identify stone types and textures: slate, schist, and gneiss are foliated; quartzite is non-foliated.
Step 2: Foliation causes anisotropy - strength varies with orientation relative to load.
Step 3: Flooring requires high abrasion resistance and isotropic strength to withstand multidirectional loads.
Step 4: Slate and schist have planes of weakness along foliation; placing foliation parallel or perpendicular affects durability but does not eliminate anisotropy.
Step 5: Quartzite, being non-foliated and composed mainly of quartz, offers high abrasion resistance and isotropic mechanical properties.
Hence, quartzite is optimal for flooring in high-traffic industrial settings.
Trap options: Assuming foliation orientation can fully mitigate anisotropy (Options A and B) is incorrect; gneiss's random foliation still causes anisotropy.
Question 58
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A sedimentary stone sample has a bulk density of 2.35 g/cm³, water absorption of 3.8%, and uniaxial compressive strength of 45 MPa. If the stone is subjected to freeze-thaw cycles in a cold climate, which combination of properties most critically predicts its durability?
A) High bulk density, low water absorption, moderate compressive strength
B) Moderate bulk density, high water absorption, high compressive strength
C) Moderate bulk density, moderate water absorption, moderate compressive strength
D) Low bulk density, low water absorption, low compressive strength
Why: Step 1: Freeze-thaw durability depends on water absorption and pore structure; water inside pores freezes and expands causing damage.
Step 2: Bulk density relates to porosity inversely; moderate bulk density suggests moderate porosity.
Step 3: Water absorption of 3.8% is moderate; high absorption (>5%) is more damaging.
Step 4: Compressive strength of 45 MPa is moderate; very high strength stones may be brittle.
Step 5: Combining moderate density, moderate absorption, and moderate strength suggests balanced durability under freeze-thaw.
Trap options: Option A ignores that low water absorption is critical but compressive strength is only moderate; Option B's high water absorption increases freeze-thaw damage despite high strength.
Question 59
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Given two igneous stones: Stone X with 65% quartz and 25% feldspar, and Stone Y with 40% quartz and 50% mica, both having similar porosity and compressive strength, which stone will exhibit better resistance to thermal shock in a high-temperature industrial furnace lining and why?
A) Stone X due to high quartz content and low mica
B) Stone Y due to higher mica content providing thermal insulation
C) Stone X due to feldspar's thermal expansion compatibility with quartz
D) Stone Y due to mica's cleavage planes reducing thermal stress
Why: Step 1: Thermal shock resistance depends on mineral stability and thermal expansion mismatch.
Step 2: Quartz has low thermal expansion and high thermal stability.
Step 3: Mica has anisotropic thermal expansion and cleavage planes that can cause internal stress.
Step 4: Feldspar's thermal expansion is closer to quartz, reducing internal stress.
Step 5: Stone X's high quartz and feldspar content minimizes thermal expansion mismatch and improves thermal shock resistance.
Trap options: Option B incorrectly assumes mica's insulation improves thermal shock resistance; Option D assumes cleavage planes reduce stress, but they can cause weakness.
Question 60
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A metamorphic rock is tested for its modulus of elasticity (E), tensile strength (T), and water absorption (W). The rock has a foliation angle of 30° to the applied load. How will the anisotropy affect the effective tensile strength and modulus of elasticity compared to a non-foliated rock with similar mineralogy and porosity?
A) Both E and T decrease due to foliation-induced planes of weakness
B) E increases but T decreases due to directional stiffness
C) E decreases but T increases due to load alignment
D) Both E and T remain unchanged due to mineralogy dominance
Why: Step 1: Foliation introduces planes of weakness causing anisotropy.
Step 2: At 30° to load, shear stresses along foliation weaken tensile strength.
Step 3: Modulus of elasticity reduces as foliation planes deform more easily.
Step 4: Non-foliated rocks have isotropic properties; mineralogy alone does not override foliation effects.
Step 5: Therefore, both E and T decrease compared to non-foliated rock.
Trap options: Option B incorrectly assumes stiffness increases; Option C wrongly assumes tensile strength increases with misaligned foliation.
Question 61
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Match the following stones to their predominant type and a key mechanical property:
1. Basalt
2. Limestone
3. Marble
4. Quartzite
A. Metamorphic - High abrasion resistance
B. Sedimentary - Moderate compressive strength
C. Igneous - High compressive strength
D. Metamorphic - Moderate tensile strength
Why: Step 1: Identify stone types:
- Basalt: Igneous
- Limestone: Sedimentary
- Marble: Metamorphic
- Quartzite: Metamorphic
Step 2: Assign mechanical properties:
- Basalt: High compressive strength (igneous)
- Limestone: Moderate compressive strength (sedimentary)
- Marble: Moderate tensile strength (metamorphic, calcite content)
- Quartzite: High abrasion resistance (metamorphic, quartz-rich)
Trap options: Confusing marble with high abrasion resistance or limestone with igneous properties.
Question 62
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Assertion (A): Granite generally exhibits higher compressive strength than sandstone due to its interlocking crystalline texture.
Reason (R): Sandstone's cementing material and grain size significantly affect its mechanical strength.
Choose the correct option:
A) Both A and R are true, and R is the correct explanation of A
B) Both A and R are true, but R is not the correct explanation of A
C) A is true, but R is false
D) A is false, but R is true
Why: Step 1: Granite's interlocking crystalline texture provides high compressive strength.
Step 2: Sandstone's strength depends on cementing material (silica, calcite, iron oxide) and grain size.
Step 3: These factors explain why sandstone is generally weaker than granite.
Step 4: Therefore, both statements are true and R explains A.
Trap options: Assuming sandstone's grain size does not affect strength or that granite's strength is unrelated to texture.
Question 63
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A stone sample with a porosity of 4.7% and water absorption of 2.9% is subjected to a uniaxial compressive load. If the stone is metamorphic with a non-foliated texture, which of the following statements about its expected mechanical response is most accurate?
A) High compressive strength with isotropic behavior due to non-foliated texture
B) Low compressive strength with anisotropic behavior due to porosity
C) Moderate compressive strength with anisotropic behavior due to mineral alignment
D) High compressive strength with anisotropic behavior due to foliation planes
Why: Step 1: Porosity of 4.7% and water absorption of 2.9% indicate moderate pore space.
Step 2: Non-foliated metamorphic stones (e.g., quartzite) have isotropic mechanical properties.
Step 3: Porosity reduces strength but does not cause anisotropy.
Step 4: Mineral alignment causing anisotropy is typical in foliated stones.
Step 5: Therefore, expect high compressive strength with isotropic behavior.
Trap options: Confusing porosity effects with anisotropy or assuming mineral alignment in non-foliated stones.
Question 64
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In an experimental study, two stones with identical compressive strengths but different mineral compositions (Stone A: high calcite, Stone B: high quartz) are subjected to acidic rain exposure. Which stone will retain its mechanical properties better over time and why?
A) Stone A due to calcite's chemical stability
B) Stone B due to quartz's chemical inertness
C) Stone A due to higher porosity allowing acid diffusion
D) Stone B due to quartz's higher water absorption
Why: Step 1: Calcite reacts readily with acidic solutions, leading to dissolution.
Step 2: Quartz is chemically inert and resists acid attack.
Step 3: Porosity affects acid diffusion but mineral stability dominates chemical weathering.
Step 4: Quartz-rich stone retains mechanical properties better under acidic rain.
Step 5: Water absorption is generally lower in quartz-rich stones, aiding durability.
Trap options: Option A incorrectly assumes calcite is stable; Option D incorrectly states quartz has higher water absorption.
Question 65
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A sandstone with grain size distribution skewed towards fine grains has a compressive strength of 30 MPa and water absorption of 6%. Another sandstone with coarser grains has 45 MPa strength and 3% absorption. Considering cementation and porosity, which statement best explains the difference?
A) Fine grains increase porosity and reduce strength despite similar cementation
B) Coarse grains decrease porosity but reduce cementation leading to lower strength
C) Fine grains improve cementation and increase strength despite higher absorption
D) Coarse grains increase porosity and absorption, reducing strength
Why: Step 1: Fine grains pack less efficiently, increasing porosity.
Step 2: Higher porosity leads to higher water absorption.
Step 3: Increased porosity reduces compressive strength.
Step 4: Cementation may be similar but porosity dominates strength.
Step 5: Coarser grains pack better, reducing porosity and increasing strength.
Trap options: Option B incorrectly assumes cementation reduces with coarser grains; Option C wrongly assumes fine grains improve strength despite absorption.
Question 66
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Assertion (A): Quartzite is preferred over marble for outdoor pavements in cold regions.
Reason (R): Quartzite has higher abrasion resistance and lower water absorption than marble.
Choose the correct option:
A) Both A and R are true, and R is the correct explanation of A
B) Both A and R are true, but R is not the correct explanation of A
C) A is true, but R is false
D) A is false, but R is true
Why: Step 1: Quartzite is a metamorphic rock with quartz dominance, offering high abrasion resistance.
Step 2: Marble, composed mainly of calcite, has higher water absorption and is prone to weathering.
Step 3: Cold regions cause freeze-thaw cycles; lower water absorption reduces damage.
Step 4: Hence, quartzite's properties make it preferable for outdoor pavements.
Step 5: Both assertion and reason are true, and reason explains assertion.
Trap options: Assuming marble's aesthetics outweigh durability or that quartzite has high water absorption.
Question 67
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A stone with a Mohs hardness of 7, specific gravity of 2.65, and porosity of 1.2% is tested for its suitability as a load-bearing column in a humid tropical environment. Which combination of properties is most critical in predicting its long-term performance?
A) High hardness, moderate specific gravity, low porosity
B) Moderate hardness, high specific gravity, high porosity
C) High hardness, high specific gravity, low porosity
D) Low hardness, moderate specific gravity, moderate porosity
Why: Step 1: Mohs hardness 7 indicates resistance to abrasion and surface wear.
Step 2: Specific gravity relates to density and strength; higher values generally indicate stronger stones.
Step 3: Low porosity reduces water ingress, critical in humid environments to prevent weathering.
Step 4: Load-bearing columns require high strength and durability.
Step 5: Combination of high hardness, high specific gravity, and low porosity predicts best long-term performance.
Trap options: Option A underestimates importance of specific gravity; Option B ignores porosity's role; Option D has low hardness unsuitable for load-bearing.
Question 68
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Match the following stones to their typical porosity range and dominant weathering mechanism:
1. Granite
2. Sandstone
3. Marble
4. Slate
A. 0.5-2%, chemical dissolution
B. 5-15%, granular disintegration
C. 1-3%, exfoliation
D. 2-5%, cleavage plane separation
Why: Step 1: Granite has low porosity (0.5-2%) and weathers mainly by chemical dissolution of feldspar.
Step 2: Sandstone has higher porosity (5-15%) and undergoes granular disintegration.
Step 3: Marble (1-3% porosity) weathers by exfoliation due to thermal expansion and chemical dissolution of calcite.
Step 4: Slate (2-5% porosity) weathers along cleavage planes causing separation.
Trap options: Confusing porosity ranges or dominant weathering mechanisms between stone types.
Question 69
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A stone used in a dam spillway must resist hydraulic abrasion, chemical attack, and freeze-thaw cycles. Which stone type and property combination best meets these criteria?
A) Igneous stone with high quartz content, low porosity, and high compressive strength
B) Sedimentary stone with high calcite content, moderate porosity, and moderate strength
C) Metamorphic foliated stone with moderate quartz content, high water absorption, and anisotropic strength
D) Sedimentary stone with high feldspar content, low porosity, and low tensile strength
Why: Step 1: Hydraulic abrasion requires high hardness and abrasion resistance.
Step 2: Chemical attack resistance requires chemically inert minerals like quartz.
Step 3: Freeze-thaw resistance requires low porosity to prevent water ingress.
Step 4: Igneous stones like granite meet these criteria.
Step 5: Sedimentary stones with calcite or feldspar are chemically vulnerable; foliated metamorphic stones have anisotropic strength.
Trap options: Option B and D underestimate chemical vulnerability; Option C ignores anisotropy and water absorption issues.
Question 70
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Assertion (A): The mechanical strength of sandstone increases with decreasing porosity and increasing cementation.
Reason (R): Porosity creates voids that act as stress concentrators, while cementation binds grains enhancing load transfer.
Choose the correct option:
A) Both A and R are true, and R is the correct explanation of A
B) Both A and R are true, but R is not the correct explanation of A
C) A is true, but R is false
D) A is false, but R is true
Why: Step 1: Porosity reduces mechanical strength by introducing voids.
Step 2: Cementation binds grains, improving strength.
Step 3: Voids act as stress concentrators causing failure initiation.
Step 4: Cementation improves load transfer between grains.
Step 5: Therefore, both statements are true and R explains A.
Trap options: Ignoring the role of cementation or misinterpreting porosity effects.
Question 71
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A metamorphic stone with a compressive strength of 80 MPa and water absorption of 1.5% is compared with an igneous stone of 90 MPa strength and 3% absorption for use in a humid tropical climate. Which stone is preferable considering durability and why?
A) Metamorphic stone due to lower water absorption reducing weathering
B) Igneous stone due to higher compressive strength
C) Metamorphic stone due to foliation improving water drainage
D) Igneous stone due to higher porosity improving moisture evaporation
Why: Step 1: Lower water absorption reduces moisture ingress and chemical weathering.
Step 2: Compressive strength difference is marginal compared to water absorption impact.
Step 3: Foliation often increases water retention, not drainage.
Step 4: Higher porosity increases water retention, not evaporation.
Step 5: Therefore, metamorphic stone with lower absorption is preferable.
Trap options: Option B focuses only on strength; Option C incorrectly assumes foliation aids drainage.
Question 72
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Which of the following properties primarily determines the durability of a building stone?
Why: Durability of stone depends mainly on its porosity and water absorption, as these affect weathering and resistance to environmental conditions.
Question 73
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Which type of stone is generally considered most durable for external building facades?
Why: Granite is highly durable due to its low porosity and high resistance to weathering, making it suitable for external facades.
Question 74
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Which factor does NOT significantly affect the durability of natural stone used in construction?
Why: Workability affects ease of shaping stone but does not directly influence its durability.
Question 75
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How does high water absorption impact the durability of a building stone?
Why: High water absorption allows water to enter pores, which can freeze and expand causing cracks, thus reducing durability.
Question 76
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A stone with high resistance to abrasion and weathering is classified as having high:
Why: High resistance to abrasion and weathering indicates high durability, essential for long-lasting construction materials.
Question 77
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Which property of stone is primarily measured by its compressive strength?
Why: Compressive strength measures the ability of stone to withstand loads that tend to reduce size, reflecting its strength.
Question 78
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Among the following, which stone generally exhibits the highest compressive strength?
Why: Granite typically has higher compressive strength compared to sandstone, limestone, and marble.
Question 79
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Which of the following factors does NOT directly influence the strength of a stone?
Why: Color is generally unrelated to strength; strength depends on internal structure and composition.
Question 80
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If a stone has a compressive strength of 150 MPa, what does this imply about its suitability for construction?
Why: A compressive strength of 150 MPa indicates the stone can withstand heavy loads, making it suitable for load-bearing applications.
Question 81
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Which stone property is best described as the ease with which it can be cut, carved, or shaped without excessive effort?
Why: Workability refers to how easily a stone can be worked or shaped for construction or decorative purposes.
Question 82
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Which of the following stones is known for excellent workability due to its fine grain and uniform texture?
Why: Marble has a fine grain and uniform texture, making it easier to carve and shape compared to harder stones like granite.
Question 83
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Which factor reduces the workability of a stone?
Why: High hardness makes stone difficult to cut or shape, reducing workability.
Question 84
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A sculptor wants to choose a stone that balances durability and ease of carving. Which stone should they select?
Why: Marble offers good durability and is easier to carve than harder stones like granite or basalt.
Question 85
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Which of the following is a common use of granite in construction?
Why: Granite is widely used for flooring and paving due to its strength and durability.
Question 86
Question bank
Limestone is commonly used in construction for which purpose?
Why: Limestone is a key raw material for cement and is also used as aggregate in concrete.
Question 87
Question bank
Which stone is best suited for decorative interior wall cladding due to its appearance and workability?
Why: Marble's attractive appearance and ease of shaping make it ideal for decorative interior cladding.
Question 88
Question bank
For constructing heavy foundation blocks in bridges, which stone is most appropriate?
Why: Granite's high strength and durability make it suitable for heavy foundation blocks in bridges.
Question 89
Question bank
Which of the following is NOT a primary criterion for selecting stone for construction?
Why: While color may influence aesthetics, it is not a primary technical criterion for stone selection.
Question 90
Question bank
When selecting stone for a coastal construction exposed to salt spray, which property is most critical?
Why: Resistance to chemical weathering is critical in coastal areas to prevent degradation from salt and moisture.
Question 91
Question bank
Which combination of stone properties is ideal for selecting a stone for load-bearing columns?
Why: Load-bearing columns require stones with high durability and strength to safely support loads over time.
Question 92
Question bank
A stone with moderate strength but excellent workability and aesthetic appeal is best used for:
Why: Such stones are ideal for decorative applications where appearance and ease of shaping are prioritized over structural strength.
Question 93
Question bank
Which of the following is a typical application of basalt in construction?
Why: Basalt is dense and hard, making it suitable as road base material and aggregate in concrete.
Question 94
Question bank
In which construction application is sandstone most commonly used?
Why: Sandstone is often used for wall cladding and flooring due to its workability and aesthetic texture.
Question 95
Question bank
Which stone is preferred for constructing railway ballast due to its hardness and durability?
Why: Granite's hardness and durability make it suitable for railway ballast which must withstand heavy loads and abrasion.
Question 96
Question bank
Which stone would be least suitable for use in a damp basement wall due to its high porosity and low durability?
Why: Sandstone often has higher porosity and lower durability, making it unsuitable for damp environments.
Question 97
Question bank
A construction engineer must select a stone for a coastal monument exposed to saline water and heavy foot traffic. The stone must have high durability against chemical weathering, compressive strength above 120 MPa, and moderate workability for intricate carvings. Given the options:
A) Granite with 130 MPa strength, low porosity, but very hard to carve
B) Sandstone with 110 MPa strength, moderate porosity, and easy to carve
C) Limestone with 125 MPa strength, high porosity, and very easy to carve
D) Basalt with 140 MPa strength, very low porosity, but poor workability
Which stone should be selected and why?
Why: Step 1: Assess durability against saline water (chemical weathering) - stones with low porosity and chemical resistance are preferred. Granite and Basalt have low porosity; Sandstone and Limestone have higher porosity.
Step 2: Check compressive strength requirement (>120 MPa) - Granite (130 MPa), Limestone (125 MPa), Basalt (140 MPa) qualify; Sandstone (110 MPa) does not.
Step 3: Evaluate workability for intricate carvings - Granite is very hard to carve (low workability), Basalt has poor workability, Limestone is very easy, Sandstone is easy.
Step 4: Balance all factors - Limestone has high porosity, making it vulnerable to saline attack; Sandstone is under strength; Basalt poor workability.
Step 5: Granite, despite low workability, offers the best compromise of durability and strength, making it the optimal choice.
Trap options: Sandstone is tempting due to workability but fails strength; Limestone is easy to carve but fails durability; Basalt is strong and durable but poor workability.
Question 98
Question bank
A stone block of dimensions 1.2 m × 0.8 m × 0.5 m is to be used as a lintel over a 3 m wide opening. The stone has a compressive strength of 150 MPa, tensile strength of 10 MPa, and modulus of elasticity of 60 GPa. Considering the bending moment and tensile stress induced, which stone type is most suitable if the lintel must not fail under a uniformly distributed load of 25 kN/m including self-weight?
Options:
A) Marble with high tensile strength but moderate durability
B) Granite with high compressive strength and moderate tensile strength
C) Sandstone with moderate compressive strength and low tensile strength
D) Basalt with very high compressive strength but low tensile strength
Why: Step 1: Calculate the total load on the lintel: 25 kN/m × 3 m = 75 kN.
Step 2: Calculate bending moment at center: M = wL²/8 = 25 × 3² / 8 = 28.125 kNm.
Step 3: Calculate section modulus Z = (b × h²) / 6 = (0.8 × 0.5²)/6 = 0.0333 m³.
Step 4: Calculate tensile stress σ = M / Z = 28.125 × 10^3 / 0.0333 = 844,844 Pa = 0.845 MPa.
Step 5: Compare tensile stress with tensile strength: 0.845 MPa < tensile strength of stone.
Step 6: Sandstone and Basalt have low tensile strength, Marble has high tensile strength but moderate durability.
Step 7: Granite has sufficient tensile strength and high compressive strength, plus better durability.
Step 8: Therefore, Granite is the most suitable.
Trap options: Marble seems good due to tensile strength but has moderate durability; Basalt has low tensile strength; Sandstone insufficient tensile strength.
Question 99
Question bank
Assertion (A): Limestone is preferred for flooring in heavy traffic areas due to its high compressive strength and low porosity.
Reason (R): Stones with low porosity always exhibit higher durability and strength regardless of mineral composition.
Options:
A) Both A and R are true, and R is the correct explanation of A.
B) Both A and R are true, but R is not the correct explanation of A.
C) A is true, but R is false.
D) A is false, but R is true.
Why: Step 1: Evaluate Assertion: Limestone generally has moderate compressive strength and relatively high porosity, making it less ideal for heavy traffic flooring.
Step 2: Evaluate Reason: Low porosity often correlates with durability but does not guarantee high strength; mineral composition also affects strength.
Step 3: Therefore, Assertion is false (limestone is not preferred for heavy traffic flooring due to these properties).
Step 4: Reason is true as porosity affects durability but not solely strength.
Step 5: Hence, correct answer is D.
Trap options: Assuming low porosity always means high strength (false), or assuming limestone has low porosity (false).
Question 100
Question bank
Match the following stones with their typical uses considering their durability, strength, and workability:
Column A:
1) Granite
2) Sandstone
3) Marble
4) Slate
Column B:
A) Roofing tiles
B) Ornamental sculptures
C) Heavy-duty pavements
D) Load-bearing columns
Options:
A) 1-D, 2-C, 3-B, 4-A
B) 1-C, 2-D, 3-A, 4-B
C) 1-B, 2-A, 3-D, 4-C
D) 1-A, 2-B, 3-C, 4-D
Why: Step 1: Granite is known for high strength and durability, suitable for load-bearing columns.
Step 2: Sandstone has moderate strength and good workability, used in heavy-duty pavements.
Step 3: Marble is highly workable and used for ornamental sculptures.
Step 4: Slate is durable, splits into thin sheets, ideal for roofing tiles.
Step 5: Therefore, correct matching is 1-D, 2-C, 3-B, 4-A.
Trap options: Confusing sandstone with marble due to workability; assuming slate is used for pavements.
Question 101
Question bank
A stone with a density of 2650 kg/m³ and porosity of 1.5% is subjected to freeze-thaw cycles in a cold climate. Considering durability, compressive strength of 140 MPa, and workability, which stone is least likely to suffer surface scaling and internal cracking?
Options:
A) Granite with interlocking crystalline texture
B) Sandstone with granular texture
C) Limestone with calcite composition
D) Basalt with fine-grained texture
Why: Step 1: Freeze-thaw durability depends on low porosity and strong interlocking texture.
Step 2: Granite has interlocking crystalline texture and low porosity, making it resistant.
Step 3: Sandstone has granular texture and higher porosity, prone to scaling.
Step 4: Limestone is calcite-based and chemically reactive, vulnerable to freeze-thaw.
Step 5: Basalt is fine-grained and dense but may have microfractures.
Step 6: Therefore, Granite is least likely to suffer damage.
Trap options: Assuming basalt is always most durable; ignoring chemical composition effects on limestone.
Question 102
Question bank
Given two stones: Stone X with compressive strength 160 MPa, tensile strength 12 MPa, and porosity 0.8%; Stone Y with compressive strength 140 MPa, tensile strength 15 MPa, and porosity 2%. For a monument requiring high tensile resistance and moderate durability, which stone is preferable and why?
Options:
A) Stone X due to higher compressive strength and lower porosity
B) Stone Y due to higher tensile strength despite higher porosity
C) Stone X due to balanced strength and durability
D) Stone Y due to better workability implied by higher porosity
Why: Step 1: Monument requires high tensile resistance and moderate durability.
Step 2: Stone X has higher compressive strength and lower porosity (better durability).
Step 3: Stone Y has higher tensile strength but higher porosity (lower durability).
Step 4: Since tensile strength is critical, Stone Y is preferred despite moderate durability.
Step 5: Workability may be better in Stone Y due to porosity, aiding monument construction.
Trap options: Choosing Stone X due to compressive strength ignoring tensile requirement; assuming porosity always outweighs tensile strength.
Question 103
Question bank
A stone masonry wall is constructed using stones with average compressive strength of 120 MPa and porosity of 3%. The wall is located in a region with high rainfall and acidic soil. Which stone property combination should be prioritized to ensure long-term durability?
Options:
A) High compressive strength, low porosity, and chemical inertness
B) Moderate compressive strength, high porosity, and high workability
C) High compressive strength, moderate porosity, and susceptibility to acid attack
D) Low compressive strength, low porosity, and high water absorption
Why: Step 1: High rainfall and acidic soil demand chemical resistance and low water absorption.
Step 2: Low porosity reduces water ingress, enhancing durability.
Step 3: High compressive strength ensures structural integrity.
Step 4: Chemical inertness prevents acid attack.
Step 5: Options B, C, D have flaws: high porosity or susceptibility to acid or low strength.
Trap options: Assuming workability or moderate strength can compensate for chemical vulnerability.
Question 104
Question bank
A sculptor wants to select a stone for an outdoor statue that requires fine detailing, moderate compressive strength (above 80 MPa), and resistance to weathering. The options are:
A) Marble with compressive strength 90 MPa, high workability, moderate weather resistance
B) Granite with compressive strength 130 MPa, low workability, high weather resistance
C) Sandstone with compressive strength 85 MPa, high workability, low weather resistance
D) Limestone with compressive strength 95 MPa, moderate workability, low weather resistance
Which stone should be selected and why?
Why: Step 1: Fine detailing requires high workability - Marble and Sandstone qualify.
Step 2: Compressive strength above 80 MPa - all qualify.
Step 3: Weather resistance is critical for outdoor statues - Marble has moderate, Sandstone and Limestone low, Granite high.
Step 4: Granite has low workability, unsuitable for fine detailing.
Step 5: Marble balances workability, strength, and weather resistance best.
Trap options: Choosing Granite for strength ignoring workability; Sandstone for workability ignoring weather resistance.
Question 105
Question bank
Consider a stone with a modulus of elasticity of 50 GPa and compressive strength of 110 MPa used as a flooring material subjected to dynamic loads. If the stone has a porosity of 1.2%, which factor most critically affects its long-term performance?
Options:
A) High modulus of elasticity ensuring minimal deformation
B) Low porosity reducing water absorption and freeze-thaw damage
C) Compressive strength preventing crushing under load
D) Workability for ease of installation
Why: Step 1: Flooring under dynamic loads requires resistance to cracking and weathering.
Step 2: Porosity affects water absorption; low porosity reduces freeze-thaw damage.
Step 3: Modulus of elasticity affects deformation but less critical than durability.
Step 4: Compressive strength is important but 110 MPa is adequate.
Step 5: Workability affects installation but not long-term performance.
Step 6: Therefore, low porosity is most critical.
Trap options: Overvaluing modulus or compressive strength ignoring environmental durability.
Question 106
Question bank
A stone with a Mohs hardness of 6, compressive strength of 140 MPa, and porosity of 0.9% is proposed for use in a heritage building facade exposed to urban pollution. Which property combination is most critical to prevent surface erosion and maintain aesthetic appearance?
Options:
A) High hardness and low porosity
B) High compressive strength and moderate workability
C) Moderate hardness and high workability
D) Low porosity and low compressive strength
Why: Step 1: Urban pollution causes surface erosion; hardness resists abrasion.
Step 2: Low porosity prevents pollutant ingress and chemical attack.
Step 3: Compressive strength less relevant for surface erosion.
Step 4: Workability affects carving but not erosion resistance.
Step 5: Therefore, high hardness and low porosity are critical.
Trap options: Overemphasizing compressive strength or workability for facade erosion resistance.
Question 107
Question bank
Which of the following stones would be most suitable for constructing a dam spillway subjected to high impact water flow and abrasive sediments, considering durability, strength, and workability?
Options:
A) Granite with high strength, low porosity, and poor workability
B) Sandstone with moderate strength, high porosity, and good workability
C) Basalt with very high strength, low porosity, and moderate workability
D) Limestone with moderate strength, moderate porosity, and high workability
Why: Step 1: Dam spillway requires high impact and abrasion resistance.
Step 2: High strength and low porosity improve durability.
Step 3: Basalt has very high strength, low porosity, and moderate workability.
Step 4: Granite has poor workability which may hinder shaping.
Step 5: Sandstone and Limestone have higher porosity and lower strength, unsuitable.
Step 6: Basalt balances all requirements best.
Trap options: Choosing granite ignoring workability; sandstone or limestone ignoring durability.
Question 108
Question bank
A stone with a porosity of 2.5% and compressive strength of 100 MPa is proposed for use in a humid tropical climate. To improve its durability, which treatment or selection criteria should be prioritized?
Options:
A) Selecting a stone with lower porosity and higher chemical inertness
B) Increasing compressive strength through heat treatment
C) Enhancing workability to allow for thinner sections
D) Using stone with higher porosity but better tensile strength
Why: Step 1: Humid tropical climate promotes chemical weathering and water ingress.
Step 2: Lower porosity reduces water absorption, improving durability.
Step 3: Chemical inertness prevents degradation by acids and salts.
Step 4: Increasing compressive strength does not address porosity or chemical attack.
Step 5: Workability and tensile strength less critical than durability in this context.
Trap options: Assuming heat treatment improves durability; prioritizing tensile strength over porosity.
Question 109
Question bank
Which stone property combination is most critical when selecting material for a foundation in a seismic zone?
Options:
A) High compressive strength, low porosity, and moderate tensile strength
B) Moderate compressive strength, high porosity, and low tensile strength
C) Low compressive strength, low porosity, and high workability
D) High compressive strength, high porosity, and low modulus of elasticity
Why: Step 1: Foundations in seismic zones must resist compressive and tensile stresses.
Step 2: High compressive strength ensures load bearing.
Step 3: Moderate tensile strength helps resist seismic tension forces.
Step 4: Low porosity improves durability and reduces water ingress.
Step 5: High porosity or low strength compromises stability.
Trap options: Assuming high porosity acceptable; ignoring tensile strength importance.
Question 110
Question bank
A stone with compressive strength 135 MPa and porosity 1.1% is used in a monument exposed to acidic rain. Which mineralogical property is most important to assess before final selection?
Options:
A) Presence of quartz to resist chemical attack
B) High calcite content prone to acid dissolution
C) Feldspar content that enhances strength
D) Mica content improving workability
Why: Step 1: Acidic rain attacks calcite-rich stones (limestone, marble).
Step 2: Quartz is chemically inert and resists acid attack.
Step 3: Feldspar and mica affect strength and workability but less relevant to acid resistance.
Step 4: Therefore, quartz presence is critical.
Trap options: Assuming feldspar or mica affect acid resistance; ignoring calcite vulnerability.
Question 111
Question bank
Which stone type is most suitable for a high-traffic pedestrian bridge deck requiring high abrasion resistance, compressive strength above 150 MPa, and moderate workability for surface finishing?
Options:
A) Granite
B) Sandstone
C) Marble
D) Limestone
Why: Step 1: High abrasion resistance is critical for pedestrian bridge decks.
Step 2: Granite has high compressive strength (>150 MPa) and excellent abrasion resistance.
Step 3: Sandstone, marble, limestone have lower abrasion resistance and strength.
Step 4: Moderate workability of granite allows surface finishing.
Trap options: Choosing marble or sandstone for workability ignoring abrasion resistance and strength.
Question 112
Question bank
A stone with compressive strength 125 MPa and porosity 1.8% is to be used in a humid environment with frequent freeze-thaw cycles. Which treatment or selection strategy best enhances its durability?
Options:
A) Applying water-repellent sealants and selecting stones with interlocking grain texture
B) Increasing stone thickness to compensate for porosity
C) Selecting stones with higher porosity but better tensile strength
D) Using stones with lower compressive strength but higher workability
Why: Step 1: Freeze-thaw cycles cause damage via water ingress and expansion.
Step 2: Water-repellent sealants reduce water absorption.
Step 3: Interlocking grain texture enhances mechanical durability.
Step 4: Increasing thickness does not prevent internal damage.
Step 5: Higher porosity increases vulnerability.
Step 6: Lower compressive strength reduces load capacity.
Trap options: Assuming thickness compensates for porosity; prioritizing tensile strength over porosity.
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