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WorksheetsIntroduction to Stones and Their Uses
Total questions: 30
Worksheet time: 15mins
According to the material, which set of conditions governs the selection of stone for structural purposes?
High porosity, low cost, and availability of timber
Cost effectiveness, fashion, ornamental value, and durability
Rapid curing time, low density, and high thermal insulation
Ease of welding, electrical conductivity, and recyclability
Based on the listed traditional uses, which application specifically cites a particular stone type?
Thin slabs for roofing, flooring, and pavements
Construction of residential and public buildings
Face work of structures for appearance and ornamental value
Limestone for manufacture of cement and as a flux in blast furnace
Refer to the three-block formation visuals. Which process best describes how igneous rock forms as depicted?
Compaction and cementation of rock fragments into layers
Recrystallization of existing rocks due to heat and pressure
Cooling and hardening of magma or lava
Chemical precipitation of minerals from solutions
Based on the formation visuals, which statement correctly distinguishes sedimentary and metamorphic rock formation?
Sedimentary rocks form from magma solidifying; metamorphic rocks form from dissolved ions precipitating.
Sedimentary rocks form by pressing and cementing pieces of rock; metamorphic rocks form when existing rocks are changed by heat and pressure.
Sedimentary rocks form by foliation of crystals; metamorphic rocks form by layering of sediments.
Sedimentary rocks form through weathering resistance; metamorphic rocks form through volcanic extrusion.
Which transformation correctly illustrates a metamorphic change and its driving condition?
Sandstone —pressure→ Quartzite
Granite —pressure→ Gneiss
Limestone —pressure→ Marble
Clay/Shale —heat→ Gneiss
Recall the physical classification: Which statement correctly describes stratified rocks?
They show distinct layers along which the rock can split, such as sandstone and limestone.
They show no stratification and cannot be easily split into thin layers, such as granite and basalt.
They split only in a definite direction due to foliation, typical of most metamorphic rocks.
They have a granulose structure like quartzite and marble and therefore never split.
Select the option that correctly distinguishes a mine from a quarry as described:
Mine: operations carried out under the ground at greater depth; Quarry: operations carried out at the ground level in an exposed condition
Mine: operations conducted only in sedimentary rocks; Quarry: operations limited to igneous rocks
Mine: uses manual tools only; Quarry: uses blasting only
Mine: produces decorative stones only; Quarry: produces only aggregates
A contractor must split comparatively soft sedimentary rocks such as sandstone and limestone without blasting. Which planned procedure aligns with the wedging method?
Locate natural cracks; if absent, drill a line of holes about 12 mm in diameter and 20–25 cm deep at roughly 10–15 cm centers; insert two feathers and a conical steel wedge (plug) in each hole and drive with a hammer to split the stone
Heat the rock surface until red-hot and quench with water to induce random cracking, then remove fragments with shovels
Drill a few large-diameter holes, charge with explosives, and fire to dislodge blocks for further dressing
Cut a continuous channel around the block using a machine, then pull it free with a crane without using wedges
Recall: In the heating method of quarrying, what primary mechanism separates two consecutive rock layers after fuel is piled and fired on the surface?
Mechanical vibration from picks and crowbars
Chemical dissolution due to ash
Uneven expansion of the two layers
Melting of intermediate minerals
Strategic Thinking: During blasting, holes are bored, charged, tamped, and fired. Which sequence below correctly aligns an operation with a critical detail to ensure safety and effectiveness?
Charging: insert wet charge to prevent ignition
Tamping: rotate the greased priming needle while filling damp clay or stone dust in layers
Firing: ignite gun cotton and dynamite directly with open flame
Boring: rely on hand drilling only for hard rocks
Skill/Concept: Using the rough estimate A=0.008L2 for explosive quantity, what mass of gunpowder or dynamite (A, in grams) is required when the line of least resistance L is 2 m?
A = 0.5 g
A = 250 g
A = 500 g
A = 1000 g
Strategic Thinking: A crew is preparing to fire a blast. Which combined actions best form a safe plan for the moments before and after firing?
Sound sirens well in advance, use a fuse that allows workers to retreat to a safe distance after firing, and ensure supervision by trained, experienced personnel
Post notices after the blast, use the shortest fuse available, and allow the nearest workers to observe for training
Skip audible signals to avoid confusion, keep workers close to monitor vibrations, and rely on general laborers for supervision
Announce blasting verbally on site, rely on natural drainage for wet holes, and let the fuse burn out while workers remain nearby
An ideal stone preservative has several properties. Which option best matches these properties?
Permits moisture penetration, develops color, low hardness, costly, and mildly corrosive
Blocks moisture penetration, avoids objectionable color, sufficiently hard against atmospheric agents, economical, non‑corrosive and harmless
Changes the original color deliberately, softens under rain, expensive, and reactive
Allows limited moisture penetration, increases gloss, requires frequent reapplication regardless of conditions
Which tool is used to mark the sink surface in a reticulated finish to present a pock-marked appearance?
Pointed tool
Flat chisel
Scabbling hammer
Polishing wheel
When specifying margins in reticulated finish, which combination is correct?
25 mm edge margin and 10 mm around sinking
20 mm edge margin and 10 mm around sinking
10 mm edge margin and 20 mm around sinking
5 mm edge margin and 25 mm around sinking
Which finish is illustrated by trough-like recesses that drop the surface below the original level?
Rubbed finish
Sunk finish
Reticulated finish
Self-faced finish
Why are igneous rocks like granite and quartz considered dangerous under fire?
They undergo sudden expansion at less than 600°C
They melt instantly at room temperature
They have low specific gravity below 2.7
They absorb large amounts of water
Which statement about sandstone in the context of fire resistance is correct?
Sandstone with silicates as binding material is fire resistant
Sandstone always undergoes sudden expansion below 600°C
Sandstone is poor in fire resistance regardless of binder
Sandstone has the highest crushing strength
Which applications are heavy stones particularly suited for?
Construction of dams and abutments
Exterior face work only
Light partition walls
Decorative cladding with minimal load
Which combination best represents a balanced selection criterion for face work stones based on the material?
Attractive uniform appearance free of defects, with good facility of dressing
Maximum crushing strength above 100 N/mm² only
Highest specific gravity available regardless of texture
Greatest fire resistance even if texture is loose
A façade stone that looks attractive but contains bands and color spots violates guidance under which property?
Appearance
Durability
Crushing strength
Specific gravity
Selecting stone with high moisture absorption negatively affects which two properties most according to the material’s emphasis?
Durability and weathering
Fire resistance and hardness
Specific gravity and crushing strength
Facility of dressing and appearance
Which statement best explains why high moisture absorption is undesirable in building stones?
It makes stones more elastic under load
It reduces strength, as high moisture absorption lowers strength values
It increases thermal resistance and causes cracking
It improves polishability but decreases density
For facility of dressing, stones should be comparatively soft yet durable with compact, homogeneous grains. What practical outcome does this enable?
They can be easily carved, molded, cut, and dressed
They will resist all chemical reactions
They can be used only in foundations
They require no maintenance after installation
Which combination increases granite’s resistance to atmospheric agencies?
Higher mica and lower quartz
Larger amount of quartz and good type of felspar
Lower silica and higher clay
Higher organic content
Which colors are listed as common for sandstone?
Red and purple only
White, green, blue, black, and yellow
Orange and pink
Brown and tan
What is the specific gravity range stated for sandstone?
2.10–2.30
2.40–2.55
2.65–2.95
3.10–3.30
Magnesium limestone (dolomite) has which composition according to the material?
60% calcium carbonate, 30% magnesium carbonate, 10% impurities
45% magnesium carbonate, 45% calcium carbonate, and remaining 10% iron, silica, and alumina
30% magnesium carbonate, 60% calcium carbonate, 10% clay
50% magnesium carbonate, 40% calcium carbonate, 10% water
Which statement about magnesium limestone’s performance is accurate?
It is suitable in acidic gas-charged atmosphere
Higher magnesia proportion is considered more durable, but it is not suitable for acidic gases
It is weak and only used for decorative panels
It is primarily used for roofing slates
Which property criterion from earlier would you prioritize when selecting stone for an exterior wall exposed to rain and wind?
High water absorption capacity
Better weathering qualities and ability to withstand adverse atmospheric agencies
Extreme softness for easy dressing
Presence of large clay impurities
