Building Material Flashcards
1
Q
Lacquer paints
A
A. are generally applied on structural steel
B. are less durable as compared to enamel paints
C. consist of resin and nitro-cellulose
D. contain alcohol as thinner
2
Q
carbon contents of cast iron, wrought iron and steel
A
cast iron = 4 %
mild steel =0.25%
steel = 0.25~1.5 %
wrought iron = <0.15%
3
Q
The initial setting time of lime-pozzolana, is
A
120 min
final setting = 24~48 hrs
High alumina cement:
Initial setting time= 3.5 hours.
Final setting time= 5 hours.
4
Q
initial and final setting time of different type of cement
A
Initial setting time of OPC 30minutes final 10 hours.
Initial setting time of quick setting cement minutes.
Final setting time of quick setting cement is 30 minutes.
Initial setting time of high alumina cement is 3.5 hours.
Final setting time of high alumina cement is 5 hours.
5
Q
The rocks which are formed due to cooling of magma at a considerable depth from earth’s surface are called
A
plutonic rock
Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.
Rocks form at moderate depth - hypabyssal eg. Dolerite.
At top of earth surface - volcanic eg. Basalt.
6
Q
igneous rock classification on depth
A
Plutonic > 35m eg granite.
Hypabyssal < 35m eg dolerite.
Volcanic on Earth surface eg basalt.
All 3 are the examples of igneous rock.
7
Q
Brittleness of cold is due to an excess of
A
DBT means ductile to brittle transition.
Phosphorus causes a DBT when the temp drops below some critical temp (which is known as cold brittleness or shortness because brittleness is caused due to lowering of temperature).
Sulphur causes a DBT when the temp rises above some critical temp (which is known as hot shortness because brittleness is caused at high temp).
Cold brittleness needs to be avoided because otherwise, steel will become brittle in winters.
8
Q
Gneiss
A
Gneiss is a high-grade metamorphic rock, meaning that it has been subjected to higher temperatures and pressures than schist. It is formed by the metamorphosis of granite, or sedimentary rock. Gneiss displays distinct foliation, representing alternating layers composed of different minerals.
9
Q
Fibre glass
A
[A]. retains heat-longer
[B]. has a higher strength to weight ratio
[C]. is shock proof and fire retardent
[D]. does not decay
10
Q
the variety of pig iron used for the manufacture of steel
A
Bessemer - steel.
Grey pig - cast iron.
White forge pig - wrought iron.
11
Q
Crucible process
A
The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as Crucible process
12
Q
specific gravity of quartz and calcite
A
For quartz = 2.65.
For calcite = 2.72.
13
Q
Apiece of sawn timber whose cross-sectional dimensions exceed 5 cm, in one direction and 20 cm in the other direction, is called a
[A]. cant
[B]. deal
[C]. baulk @
[D]. strip.
A
Baulk is generally known as log.
When thickness 5cm more & width 20cm more this called Baulk (log). !
14
Q
Quick lime (or caustic lime)
[A]. is obtained by the calcination of pure lime stone
[B]. has great affinity to moisture
[C]. is amorphous
[D]. All the above. @
A
Quick lime (or caustic lime)
[A]. is obtained by the calcination of pure lime stone
[B]. has great affinity to moisture
[C]. is amorphous
[D]. All the above. @
15
Q
Pick up the correct statement from the following:
[A]. soft stones are required for carving
[B]. light stones are required for arches
[C]. hard stones are required to stand high pressure
[D]. All the above. @
A
Soft stone is used for carving because carving is done better in losse packed stone.
16
Q
Name the type of cement from the following for canal linings :
[A]. sulphate resisting cement @
[B]. rapid hardening cement
[C]. quick setting cement
[D]. pozzuolana cement.
A
Sulphate Resisting Portland Cement is correct Ans.
In this cement, the percentage of Tricalcium aluminate is kept below 5% and its results in the increase in resisting powder against sulphates. It is used for structures which are likely to be damaged by severe alkaline conditions such as canal linings, culverts etc.
17
Q
Black marble is generally found in the district of
[A]. Jodhpur [B]. Jaipur @ [C]. Jabalpur [D]. Jaisalmer [E]. Pune.
A
Generally, white marble is found in Jabalpur district (M.P) & Black marble in Jaipur.
18
Q
The most fire resistant paints are :
[A]. enamel paints
[B]. aluminium paints
[C]. asbestos paints @
[D]. cement paints
A
Most outstanding advantages of aluminum paint.
Aluminum paint has a quick drying process and offers good quality aluminum paint price ratio. It presents a great capacity coating is especially suitable as thermal insulation and is considered a type of highly corrosion resistant paint.
Asbestos Paint.
The natural fire-resistant property of asbestos makes it ideal for roofing, flooring, and thermal insulation. Since a home needs to be fire resistant, many prefer using asbestos. The asbestos material doesn’t burn, so placing asbestos near electrical components are advised.
19
Q
If P is the percentage of water required for normal consistency, water to be added for determination of initial setting time, is
[A]. 0.70 P [B]. 0.75 P [C]. 0.80 P [D]. 0.85 P @ [E]. 0.90 P.
A
Why used in cement setting time mould 85 percent water addition & Le chart. 78 percent.
20
Q
A good brick earth should contain :
[A]. about 20% to 30% of alumina [B]. about 50% to 60% of silica [C]. not more than 5% of lime [D]. about 5 to 6% of oxide of lime [E]. All the above.
A
Fat lime is also known as high calcium lime or pure lime or rich lime or white lime. It is popularly known as fat lime as it slakes vigorously and its volume is increased to about 2 to 2.5 times that of quick lime. This lime is used for various purposes as whitewashing, plastering of walls, as lime mortar with sand for pointing in masonry work, as a lime mortar with turki for thick masonry walls, foundations, etc.
21
Q
Shingle is
[A]. decomposed laterite @
[B]. crushed granite
[C]. water bound pebbles
[D]. air weathered rock.
A
Shingle - water-bound pebbles.
Moorum - Decomposed laterite.
Rhyolite - Crushed Granite.
22
Q
The lime which contains mainly calcium oxide and slacks with water, is
[A]. fat lime [B]. quick lime @ [C]. hydraulic lime [D]. poor lime [E]. none of these.
A
Quicklime is correct.
Types of quicklime (CaO+impurities in the form of clay etc)-
- Rich lime/fat lime/white lime- The quicklime in which 95% to 100% pure lime (CaO), 0-5% impurity.
- Hydraulic lime- The quicklime in which 70 to 95% pure lime (CaO), 5-30% impurity.
- Poor lime/Lean lime- the quicklime in which up to 70% (CaO), more than 30% impurity.
23
Q
Inhaling of fly-ash over a long period causes
[A]. silicosis [B]. fibrosis of lungs [C]. bronchitis [D]. pneumonitis [E]. All of these. @
A
Inhaling of fly-ash over a long period causes
[A]. silicosis [B]. fibrosis of lungs [C]. bronchitis [D]. pneumonitis [E]. All of these. @
24
Q
Minimum required water cement ratio for a workable concrete, is
[A]. 0.30 [B]. 0.40 @ [C]. 0.50 [D]. 0.60 [E]. 1.0.
A
In concrete, for chemical reaction 0.23% water content is require. and 0.15% water content require for evaportion loss. 0.23 + 0.15 = 0.38.
But on-site for convenience, we take 0.38 as 0.40
25
Pick up the correct statement from the following: Method of sawing timber
[A]. tangentially to annual rings, is known as tangential method.
[B]. in four quarters such that each board cuts annual rings at angles not less than 45°, is known as quarter sawing method.
[C]. cut out of quarter logs, parallel to the medullary rays and perpendicular to annual rings, is known as radial sawing.
[D]. all the above. @
Ordinary Sawing.
It is the most economical, cheapest and is widely used method of sawing. In it only long parallel planks are cut. Because the inner portion is heartwood which is hard and outer portion is sapwood which is soft thus after dryness there will be unequal shrinkage, thus the planks are liable to wrap and twist.
In Quarter sawing, the logs are cut or sawn in a quarter and is then cut in such a way so as to bend in a transverse direction. This method is adopted when no distinct medullary rays are present and gives very fine figure wood.
In this method, logs are sawn parallel to modular rays and perpendicular to annual rings. This method gives the least shrinkage but most wasteful. This method gives most decorative works in which medullary rays are marked, and least shrinkage is because of the property of medullary rays to resist shrinkage.
Tangential Sawing.
If annual rings are well formed and medullary rays are not well formed than tangential sawing is used. In this method, cuts are made tangent to the annual rings. Planks obtained by this method wraps too much and must not be used for costly works. Such planks are not suitable for flooring.
26
Clay and silt content in a good brick earth must be at least
```
[A]. 50% @
[B]. 40%
[C]. 30%
[D]. 25%
[E]. 20%.
```
Clay and silt content in a good brick earth must be at least
```
[A]. 50% @
[B]. 40%
[C]. 30%
[D]. 25%
[E]. 20%.
```
27
Bessemer process is used for the manufacture of
[A]. Pig iron
[B]. cast iron
[C]. Wrought iron
[D]. Steel. @
Bessemer process is used for the manufacture of
[A]. Pig iron
[B]. cast iron
[C]. Wrought iron
[D]. Steel. @
28
The portion of the brick without a triangular corner equal to half the width and half the length, is called
[A]. closer
[B]. queen closer
[C]. king closer @
[D]. squint brick.
Given answer is correct.
Brick without a triangular corner equal to half of its length and half of its width is KING CLOSER.
If it is only half of its width cut along full lenght then it QUEEN CLOSER.
29
A good quality stone absorbs water less than
```
[A]. 5% @
[B]. 10%
[C]. 15%
[D]. 20%
[E]. 25%.
```
A good quality stone absorbs water less than
```
[A]. 5% @
[B]. 10%
[C]. 15%
[D]. 20%
[E]. 25%.
```
30
The rocks in which argil (or clay) predominates, are called
[A]. sillicious rocks
[B]. argillaceous rocks @
[C]. calcareous rocks
[D]. igneous rocks.
Siliceous, argillaceous, calcareous are all Sedimentary Rock.
Siliceous rocks are sedimentary rocks that have silica (SiO2) as the principal constituent.
Argillaceous components are fine-grained (less than 2 µm) CLAY minerals such as kaolinite.
Calcareous is partly composed of calcium carbonate, in other words, containing lime or being chalky.
31
Inner part of a timber log surrounding the pitch, is called
[A]. sapwood
[B]. cambium layer
[C]. heart wood @
[D]. none to these.
PHSCB from innermost to outermost,
1. Pitch
2. Heartwood
3. Sap wood
4. cambium
5. Bark
32
Resins are
```
[A]. not soluble in water
[B]. soluble in spirit
[C]. used in varnishes
[D]. left behind on evaporation of oil
[E]. all the above. @
```
Resins are
```
[A]. not soluble in water
[B]. soluble in spirit
[C]. used in varnishes
[D]. left behind on evaporation of oil
[E]. all the above. @
```
33
Expanded metal is
[A]. manufactured from steel sheets
[B]. used for reinforced concrete in road pavements
[C]. measured in term of SWM (shortway mesh) and LWM (long way mesh)
[D]. all the above. @
Expanded metal is a form of metal stock made by shearing a metal plate in a press, so that the metal stretches, leaving diamond-shaped voids surrounded by interlinked bars of the metal.
EXAMPLE-
Grates : in outdoor furniture (e.g. benches).
fencing : installation of "heating floor" system;.
plastering (metal lath).
34
The rock generally used for roofing, is
[A]. granite
[B]. basalt
[C]. slate @
[D]. pumice.
Slate can be made into roofing slates, which are installed by a Slater. And, are a type of roof shingle, or more specifically a type of roof tile. Slate has two lines of break ability "Cleavage and grain" which make it possible to split the stone into thin sheets. When broken, slate retains a natural appearance while remaining relatively flat and easy to stack.
35
The commonly used drying oil for oil paints, is
[A]. olive oil
[B]. linseed oil
[C]. kerosine oil
[D]. accetate of lead. @
Drying oil is a kind of vegetable oil which drys in normal temperature. Linseed oil, Poppy oil, Walnut oil, Sunflower oil and Safflower oil are known as typical drying oil. Acetate of lead is a drying agent.
Some drying oils are Linseed oil, Poppy seed oil, Walnut oil, tung oil. Here the qb is "commonly used drying oil for oil paints" so the answer is LINSEED OIL.
36
The foliated structure is very common in
[A]. sedimentary rocks
[B]. igneous rocks
[C]. metamorphic rocks @
[D]. none of these.
Except for marble and quartzite only.
All general metamorphic rocks are foliated rocks.
Foliation in geology refers to repetitive layering in metamorphic rocks. Each layer can be as thin as a sheet of paper, or over a meter in thickness. The word comes from the Latin folium, meaning "leaf", and refers to the sheet-like planar structure.
37
Wrought iron is manufactured from pig iron by
```
[A]. refining
[B]. pudding
[C]. shingling
[D]. rolling
[E]. all the above. @
```
The puddling furnace is a metal making technology used to create wrought iron or steel from the pig iron produced in a blast furnace.
Refining-it one type of iron making process.
Shingling was a stage in the production of bar iron or steel.
Rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform.
38
Pick up the correct statement from the following:
[A]. The phenol is carbolic acid
[B]. The phenol is either extracted from coal-tar or prepared from benzene
[C]. Phenol reacts with formaldehyde, to form phenol formaldehyde resin
[D]. The plastics prepared from phenol-formaldehyde are used for paints, varnishes, w.c. seats
[E]. All the above. @
Pick up the correct statement from the following:
[A]. The phenol is carbolic acid
[B]. The phenol is either extracted from coal-tar or prepared from benzene
[C]. Phenol reacts with formaldehyde, to form phenol formaldehyde resin
[D]. The plastics prepared from phenol-formaldehyde are used for paints, varnishes, w.c. seats
[E]. All the above. @
39
Pick up the correct statement from the following:
[A]. Catalysts are added to assist and accelerate the hardening of resin,
[B]. The fillers are inert materials and they impart strength and hardness
[C]. Fibrous fillers increase thermal resistance
[D]. All the above. @
Pick up the correct statement from the following:
[A]. Catalysts are added to assist and accelerate the hardening of resin,
[B]. The fillers are inert materials and they impart strength and hardness
[C]. Fibrous fillers increase thermal resistance
[D]. All the above. @
40
Wrought iron is used for
[A]. structural works in beams
[B]. small sized water pipes @
[C]. columns and struts
[D]. none to these.
Wrought iron is an iron alloy with a very low carbon (less than 0.08%) content in contrast to cast iron (2.1% to 4%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which gives it a "grain" resembling wood that is visible when it is etched or bent to the point of failure.
41
The timber having maximum resistance against white ants, is obtained from
[A]. chir
[B]. shisham
[C]. sal @
[D]. teak.
Answer is wrong. Teak is the right answer. Because its smell of this tree is not favorable to white ants or termites. Another example for such a tree is sal.
42
Knots in timber are
[A]. defects caused by crushing fibres
[B]. splits radiating from the centre
[C]. speckled strains
[D]. signs of branches cut off. @
Knot- it shows the root branches which are broken or cut of the tree.
Shakes- It is the result of rupture of tissues causing partial or complete separation of the along grain.
Heat shake- it occurs due to shrinkage of the inner part of the trunk. They start from the heart, extend in a redial direction perpendicular to the annual rings.
Star shake- these are redial cracks start from the park and extend towards inner portion.
Cup shake or ring shake- they are curved cracks parallel to annual rings.
43
Lime concrete is generally used for
[A]. wall foundations
[B]. flooring at ground level @
[C]. both (a) and (b)
[D]. neither (a) nor (b).
Lime concrete is very widely used for foundation bases of load bearing walls, columns, and under layers of floors. So, C is correct.
44
Stuco paints are suitable for
[A]. stone masonry
[B]. brick walls
[C]. both (a) and (b) @
[D]. neither (a) nor (b).
Stucco or render is a material made of aggregates, a binder, and water. Stucco is applied wet and hardens to a very dense solid. It is used as decorative coating for walls and ceilings and as a sculptural and artistic material in architecture.
Stucco may be used to cover less visually appealing construction materials such as metal, concrete, cinder block, or clay brick and adobe.
45
Duco is one of the patent forms of
```
[A]. emulsion paints
[B]. plastic paints
[C]. bituminous paints
[D]. aluminium paints
[E]. cellulose paints. @
```
Duco is one of the patent form of cellulose paint available in the market.
46
The normal curing period for lime mortar, is:
```
[A]. one day
[B]. 3 days
[C]. 7 days @
[D]. 10 days
[E]. 14 days.
```
The normal curing period for lime mortar, is:
```
[A]. one day
[B]. 3 days
[C]. 7 days @
[D]. 10 days
[E]. 14 days.
```
47
The type of steel used for precision levelling staff, is
[A]. Titanium steel
[B]. Carbon steel
[C]. Invar @
[D]. Stainless steel.
Invar has less expasion property due to change in temperature.
48
During pudding
[A]. molten metal is kept clear of the fuel
[B]. carbon is converted into carbonic acid gas
[C]. silicon forms a slag
[D]. metal is heated by the burning of gases
[E]. all the above. @
During pudding
[A]. molten metal is kept clear of the fuel
[B]. carbon is converted into carbonic acid gas
[C]. silicon forms a slag
[D]. metal is heated by the burning of gases
[E]. all the above. @
49
German silver is an alloy of
```
[A]. zinc, lead and nickel
[B]. silver, gold and lead
[C]. copper, nickel and zinc @
[D]. copper, brass and zinc
[E]. brass, silver and zinc.German silver is an alloy of
```
German silver is an alloy of
```
[A]. zinc, lead and nickel
[B]. silver, gold and lead
[C]. copper, nickel and zinc @
[D]. copper, brass and zinc
[E]. brass, silver and zinc.
```
50
Quartzite, a metamorphic stone is
```
[A]. hard
[B]. brittle
[C]. crystalline
[D]. compact
[E]. All the above. @
```
Quartzite, a metamorphic stone is
```
[A]. hard
[B]. brittle
[C]. crystalline
[D]. compact
[E]. All the above. @
```
51
Pick up the correct statement from the following:
[A]. Plastics have generally low melting point
[B]. The coefficient of thermal expansion of plastics is about three times than that of steel
[C]. The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
[D]. All the above. @
Pick up the correct statement from the following:
[A]. Plastics have generally low melting point
[B]. The coefficient of thermal expansion of plastics is about three times than that of steel
[C]. The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
[D]. All the above. @
52
Dextrin is
```
[A]. animal glue
[B]. starch glue
[C]. albumin glue
[D]. rubber based adhesive @
[E]. none to these.
```
Dextrin, along with all dietary fibers, may aid in reducing the glycemic load of a meal containing carbohydrates.
Although fiber is a carbohydrate, it is not digested and does not raise blood sugar or insulin. Water-soluble fiber, like dextrin, displays the most beneficial effect on glucose levels.
The right answer is B starch glue as dextrin is formed by heating starch.
53
For the manufacture of stainless steel, steel is mixed with
[A]. chromium @
[B]. nickel
[C]. tungsten
[D]. none of these.
Chromium in steel is 11% and Nickel is 8%.
54
Pick up the correct statement from the following:
[A]. Quick lime is obtained by burning pure lime stone:
[B]. Hydraulic lime is obtained by burning lime stone containing clay 5% to 30%
[C]. Poor lime is obtained by burning lime stone containing impurities more than 5%
[D]. All the above. @
Option C should be more than 30% instead of more than 5%.
55
Smith's test of stones is performed to find out
[A]. the presence of soluble matter of stone @
[B]. the compressive strength of the stone
[C]. the hardness of the stone
[D]. the toughness of the stone.
Tests on stone (Strength and Durability Tests).
Acid test (presence of calcium carbonate in building stone. If the edges are broken and powder is formed on the surface, it indicates the presence of calcium carbonate.
Attrition test ( (his test is done to find out the rate of wear of stones, which are used in road construction. The results of the test indicate the resisting power of stones against the grinding action under traffic. ).
```
Crushing test.
Crystalline test (Crystallization of CaSO4 in pores of stone causes decay of stone due to weathering).
```
Freezing and thawing test.
Hardness Test (Coefficient of hardness = 20 " (Loss of weight in gm/3).
Impact test (For determining the toughness of stone, it is subjected to impact test in a Page Impact Test Machine).
Smith's Test (Presence of earthy matter will convert the clear water into dirty water. If water remains clear, stone will be durable and free from any soluble matter).
56
The process of decarbonising the pig iron completely and then adding proper percentage of carbon for manufacturing steel, is called
[A]. Cementation process @
[B]. crucible process
[C]. Bessemer process
[D]. Open hearth process.
In cementation process, the pig iron is converted to almost pure wrought iron and then preparing steel by adjusting carbon content.
The Bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron before the development of the open hearth furnace. The key principle is removal of impurities from the iron by oxidation with air being blown through the molten iron. The oxidation also raises the temperature of the iron mass and keeps it molten.
Open hearth furnaces are one of a number of kinds of furnace where excess carbon and other impurities are burnt out of pig iron to produce steel. Since steel is difficult to manufacture due to its high melting point, normal fuels and furnaces were insufficient and the open hearth furnace was developed to overcome this difficulty. Compared to Bessemer steel, which it displaced, its main advantages were that it did not expose the steel to excessive nitrogen (which would cause the steel to become brittle), was easier to control, and it permitted the melting and refining of large amounts of scrap iron and steel.
57
The operation of removal of impurities or clay adhering to iron ores, is known as
[A]. dressing @
[B]. calcination
[C]. roasting
[D]. smelting.
The operation of removal of impurities or clay adhering to iron ores, is known as
[A]. dressing @
[B]. calcination
[C]. roasting
[D]. smelting.
58
Dry rot
```
[A]. cracks the timber
[B]. reduces the strength of timber
[C]. reduces the timber to powder @
[D]. shrinks the timber
[E]. spoils the appearance of timber.
```
Dry rot
```
[A]. cracks the timber
[B]. reduces the strength of timber
[C]. reduces the timber to powder @
[D]. shrinks the timber
[E]. spoils the appearance of timber.
```
59
Which one of the following polymers is obtained from condensation polymerization ?
[A]. phenol formaldehyde
[B]. carbamide
[C]. melamine-formaldehyde
[D]. all of these. @
Which one of the following polymers is obtained from condensation polymerization ?
[A]. phenol formaldehyde
[B]. carbamide
[C]. melamine-formaldehyde
[D]. all of these. @
60
The weight of 1 m3 of brick earth, is about
[A]. 1200 kg
[B]. 1500 kg
[C]. 1800 kg @
[D]. 2000 kg.
The weight of 1 m3 of brick earth, is about
[A]. 1200 kg
[B]. 1500 kg
[C]. 1800 kg @
[D]. 2000 kg.
61
Cement paints usually
```
[A]. contain hydrated lime
[B]. contain 5% to 10% colour pigments
[C]. are prepared with white cement
[D]. contain 5% sodium chloride
[E]. all the above. @
```
Cement paints usually
```
[A]. contain hydrated lime
[B]. contain 5% to 10% colour pigments
[C]. are prepared with white cement
[D]. contain 5% sodium chloride
[E]. all the above. @
```
62
The cement becomes unsound by the presence of excess
[A]. sulphur
[B]. magnesia
[C]. lime
[D]. All of these. @
Soundness due to the lime is measured in Le-Chaltier's apparatus.
Soundness due to magnesia is measured in auto clave test.
Soundness due to sulphur can't be measure.
63
The kiln which may work throughout the year, is
[A]. Clamp
[B]. Bull's kiln
[C]. Hoffman's kiln @
[D]. none of these.
The kiln which may work throughout the year, is
[A]. Clamp
[B]. Bull's kiln
[C]. Hoffman's kiln @
[D]. none of these.
64
The steel which contains fissures and cavities, is manufactured by
[A]. Cementation process @
[B]. Crucible process
[C]. Bessemer process
[D]. Open hearth process.
The steel which contains fissures and cavities, is manufactured by
[A]. Cementation process @
[B]. Crucible process
[C]. Bessemer process
[D]. Open hearth process.
65
Pick up the volcanic rock from the following:
[A]. Granite
[B]. Dolerite
[C]. Basalt @
[D]. All the above.
Volcanic - Basalt and trap.
Hypabyssal - Dolerute apite and dolomite.
Plutoic - Granite synite periodolite.
66
In stone masonry, stones (stratified rocks) are so placed that the direction of pressure to the plane of bedding is
```
[A]. right angles @
[B]. 45°
[C]. 60°
[D]. parallel
[E]. None of these.
```
Stratified rocks are weaker when we put force parallel to the stratified layer of rocks it makes the rock break in parallel layer, however when we apply force perpendicular to the stratified layer of rock, it dose not break because it has numerous thin layer in that direction.
Stratified means naturally combination of parallel sheet of rocks due to metamorphic action, however we usually avoid stratified rocks for load bearing structure, instead we use non stratified rocks for load bearing structure.
67
Softer variety of steel may be obtained by
[A]. Cementation process
[B]. crucible process
[C]. Bessemer process @
[D]. Open hearth process.
Softer variety of steel may be obtained by
[A]. Cementation process
[B]. crucible process
[C]. Bessemer process @
[D]. Open hearth process.
68
Calcination of iron ores is done
```
[A]. to remove moisture
[B]. to remove carbonic acid
[C]. by roasting in heaps
[D]. after dressing
[E]. all the above. @
```
Calcination of iron ores is done
```
[A]. to remove moisture
[B]. to remove carbonic acid
[C]. by roasting in heaps
[D]. after dressing
[E]. all the above. @
```
69
The cast iron when heated to red heat with powdered red haemetite in an oven for increasing its toughness, is converted to
[A]. grey cast iron
[B]. white cast iron
[C]. mottled cast iron @
[D]. toughed cast iron.
The cast iron when heated to red heat with powdered red haemetite in an oven for increasing its toughness, is converted to
[A]. grey cast iron
[B]. white cast iron
[C]. mottled cast iron @
[D]. toughed cast iron.
70
Jhuma bricks are
[A]. under burnt
[B]. over burnt @
[C]. kutcha
[D]. none of these.
Jhuma bricks are
[A]. under burnt
[B]. over burnt @
[C]. kutcha
[D]. none of these.
71
Plastic bitumen is generally used for
[A]. road pavements
[B]. expansion joints
[C]. crack fillings @
[D]. none to these.
Plastic bitumen is generally used for
[A]. road pavements
[B]. expansion joints
[C]. crack fillings @
[D]. none to these.
72
Plastic bitumen is generally used for
[A]. road pavements
[B]. expansion joints
[C]. crack fillings @
[D]. none to these.
Plastic bitumen is used for making Road Pavements.
It makes it water-resistant thereby increasing its life.
73
Cast iron
```
[A]. is obtained by purifying pig iron
[B]. is manufactured in required shapes
[C]. may contain 2 to 5 per cent of carbon with other impurities
[D]. is remelted in a cupola furnace
[E]. all the above. @
```
Cast iron
```
[A]. is obtained by purifying pig iron
[B]. is manufactured in required shapes
[C]. may contain 2 to 5 per cent of carbon with other impurities
[D]. is remelted in a cupola furnace
[E]. all the above. @
```
74
Pick up the correct statement from the following:
[A]. Steel produced by open hearth process is milder than that obtained by the bessemer process
[B]. Engineers prefer open hearth steel for structural purpose as it is more homogenous
[C]. Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
[D]. all the above. @
Pick up the correct statement from the following:
[A]. Steel produced by open hearth process is milder than that obtained by the bessemer process
[B]. Engineers prefer open hearth steel for structural purpose as it is more homogenous
[C]. Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
[D]. all the above. @
75
Pick up the correct statement from the following:
[A]. The distinct plane of division along which a stone can easily be split, is called natural bed of stone
[B]. The natural bed of sedimentary rocks is along the planes of stratification
[C]. The natural bed of igneous rocks is not defined
[D]. All the above. @
Pick up the correct statement from the following:
[A]. The distinct plane of division along which a stone can easily be split, is called natural bed of stone
[B]. The natural bed of sedimentary rocks is along the planes of stratification
[C]. The natural bed of igneous rocks is not defined
[D]. All the above. @
76
Invar contains
[A]. 12% of nickel
[B]. 24% of nickel
[C]. 30% to nickel
[D]. 36% of nickel. @
It is 64% Fe + 36% Ni.
77
Lime stone is not a
[A]. sedimentary rock
[B]. stratified rock
[C]. aqueous rock
[D]. metamorphic rock. @
D is wrong
78
Pig iron is manufactured from the ores by
[A]. dressing
[B]. calcination and roasting
[C]. smelting
[D]. all the above. @
Pig iron is manufactured from the ores by
[A]. dressing
[B]. calcination and roasting
[C]. smelting
[D]. all the above. @
79
The portion of a brick cut to form angles other than right angles in plan, is known as
[A]. queen closer
[B]. king closer
[C]. closer
[D]. squint brick. @
The portion of a brick cut to form angles other than right angles in plan, is known as
[A]. queen closer
[B]. king closer
[C]. closer
[D]. squint brick. @
80
Pick up the correct statement from the following:
[A]. Slaked lime contains calcium hydroxide
[B]. Quick lime contains calcium oxide
[C]. Slaked lime may be obtained from quick lime
[D]. Slaked lime is obtained by adding water to quick lime
[E]. All the above. @
Pick up the correct statement from the following:
[A]. Slaked lime contains calcium hydroxide
[B]. Quick lime contains calcium oxide
[C]. Slaked lime may be obtained from quick lime
[D]. Slaked lime is obtained by adding water to quick lime
[E]. All the above. @
81
Plywood is obtained by gluing wooden sheets at
[A]. 100 to 150 N/cm2
[B]. 100 to 130°C
[C]. both (a) and (b) @
[D]. Neither (a) nor (b).
Plywood is obtained by gluing wooden sheets at a pressure of 100 to 150 N/cm2 and a temperature of 100 to 130 degrees Celsius. Plywood is made up of three or more thin layers of wood. These layers are bonded together with an adhesive.
82
Putty is
[A]. made with finely powdered chalk and linseed oil
[B]. used for fixing glass panes
[C]. softened by a solution of pearl ash and quick-lime soaked in water
[D]. all the above. @
Putty is
[A]. made with finely powdered chalk and linseed oil
[B]. used for fixing glass panes
[C]. softened by a solution of pearl ash and quick-lime soaked in water
[D]. all the above. @
83
The initial setting time of hydraulic lime, is
```
[A]. 30 minutes
[B]. 60 minutes
[C]. 90 minutes
[D]. 120 minutes @
[E]. 150 minutes.
```
The initial setting time of hydraulic lime, is
```
[A]. 30 minutes
[B]. 60 minutes
[C]. 90 minutes
[D]. 120 minutes @
[E]. 150 minutes.
```
84
Generally wooden moulds are made from
```
[A]. ply wood
[B]. shisham wood @
[C]. deodar wood
[D]. teak wood
[E]. hard wood.
```
Shisham is used for making molds because it doesn't warp easily.
85
The pigment used in paints for corrosive resistance, is
```
[A]. white lead
[B]. ferrous oxide
[C]. zinc white
[D]. red lead @
[E]. gypsum.
```
The pigment used in paints for corrosive resistance, is
```
[A]. white lead
[B]. ferrous oxide
[C]. zinc white
[D]. red lead @
[E]. gypsum.
```
86
A well seasoned timber may contain moisture up to
[A]. 4 to 6%
[B]. 6 to 8%
[C]. 8 to 10%
[D]. 10 to 12%. @
According to IS 399:1963, the weight of the timber is specified at 12% moisture content.
87
Oil varnish generally consists of
[A]. synthetic resin and spirit
[B]. oil, wax and resin
[C]. resin, oil and turpentine @
[D]. spirit, oil and wax
Oil when mixed with resinous substances is called oil varnish and when sprit mixed with spirit is spirit varnish. In oil varnish, turpentine is added however.
88
In arches, stratified stones are placed so that their planes are
[A]. parallel
[B]. perpendicular
[C]. radial @
[D]. none of these.
In arches, stratified stones are placed so that their planes are
[A]. parallel
[B]. perpendicular
[C]. radial @
[D]. none of these.
89
The fire clay contains pure
[A]. lime
[B]. oxide of iron
[C]. hydrated aluminium silicate @
[D]. magnesium.
Fire clay is a range of refractory clays used in the manufacture of ceramics, especially fire brick. The United States Environmental Protection Agency defines fire clay very generally as a "mineral aggregate composed of hydrous silicates of aluminium with or without free silica".
90
Pick up the correct characteristic of Pyroxene from the following:
```
[A]. It forms octagonal crystals
[B]. It converts to chlorine by hydration
[C]. Its density is 2.3 to 3.6 g/cm2
[D]. Its hardness is 5 to 6
[E]. All the above. @
```
Pick up the correct characteristic of Pyroxene from the following:
```
[A]. It forms octagonal crystals
[B]. It converts to chlorine by hydration
[C]. Its density is 2.3 to 3.6 g/cm2
[D]. Its hardness is 5 to 6
[E]. All the above. @
```
91
Pick up the correct characteristic of Pyroxene from the following:
```
[A]. It forms octagonal crystals
[B]. It converts to chlorine by hydration
[C]. Its density is 2.3 to 3.6 g/cm2
[D]. Its hardness is 5 to 6
[E]. All the above. @
```
Pick up the correct characteristic of Pyroxene from the following:
```
[A]. It forms octagonal crystals
[B]. It converts to chlorine by hydration
[C]. Its density is 2.3 to 3.6 g/cm2
[D]. Its hardness is 5 to 6
[E]. All the above. @
```
92
For sanitary pipes and chemical stonewares,
[A]. salt glazing is used @
[B]. lead glazing is used
[C]. opaque glazing is used
[D]. None of these.
Salt glazing.
The wet salt is vaporized and the vapor formed is of sticky nature. This salt vapor forms a glass-like layer on the surface of a clay product. The salt glazing generally produces brownish color on the product. Stoneware products, sanitary pipes, etc are glazed by this method.
How do you make salt glaze for pottery?
When salt-glazing pottery, unglazed wares are placed in the kiln and heated to a very high temperature. At that point, salt is thrown into the hot kiln; the salt vaporizes, fuming throughout the kiln interior, and combines with the clay of the pottery, forming a natural glaze on all the pots.
93
The steel used for rails under heavy traffic and on sharp curves, is
[A]. Nickel steel
[B]. Chrome steel
[C]. Magnese steel @
[D]. Vanadium steel.
Because vanadium in the Steel provides toughness where is manganese in the Steel provides tensile strength and according to given problem the main requirement hair is the tensile strength so that's why this is steel is used?
94
Snowcrete is one of the patent forms of
[A]. distempers
[B]. water proof cement paints @
[C]. enamel paints
[D]. cellulose paints.
Snowcrete is one of the patent forms of
[A]. distempers
[B]. water proof cement paints @
[C]. enamel paints
[D]. cellulose paints.
95
The usual percentages of clay and metal in cermet are :
[A]. 50%, 50%
[B]. 60%, 40%
[C]. 70%, 30%
[D]. 80%, 20%. @
A cermet is a composite material composed of ceramic (cer) and metal (met) materials. A cermet is ideally designed to have the optimal properties of both a ceramic, such as high temperature resistance and hardness, and those of a metal, such as the ability to undergo plastic deformation.
96
Pick up the correct statement from the following:
[A]. Horn blende mineral is brittle
[B]. Muscovite is also known as white mica and potashmica
[C]. Biotite is also known as blackmica
[D]. All the above. @
Pick up the correct statement from the following:
[A]. Horn blende mineral is brittle
[B]. Muscovite is also known as white mica and potashmica
[C]. Biotite is also known as blackmica
[D]. All the above. @
97
The thermosetting plastic
[A]. becomes rigid when moulded at suitable pressure and temperature
[B]. at 127°C to 177°C permanently set and further application of heat does not soften it
[C]. charrs at 343°C
[D]. All the above. @
The thermosetting plastic
[A]. becomes rigid when moulded at suitable pressure and temperature
[B]. at 127°C to 177°C permanently set and further application of heat does not soften it
[C]. charrs at 343°C
[D]. All the above. @
98
Pick up the synthetic resin from the following:
```
[A]. Malamine resin
[B]. Phenolic resin
[C]. Resorcinol resin
[D]. Urea resin
[E]. All of these. @
```
Pick up the synthetic resin from the following:
```
[A]. Malamine resin
[B]. Phenolic resin
[C]. Resorcinol resin
[D]. Urea resin
[E]. All of these. @
```
99
Slacking of lime is affected by
[A]. keeping it exposed to air
[B]. immersing the lime in water @
[C]. crushing the lime lumps
[D]. none of these.
The process of adding water to calcium oxide to produce calcium hydroxide is referred to as hydration process or lime slaking. This hydration process, when done with just the right amount of water for chemical reaction, is called "Dry Hydration".
100
Non acid-resistant asbestos is :
[A]. tremolite asbestos
[B]. chrysolite abestos @
[C]. amosite absestos
[D]. none of these.
Chrysotile or white asbestos is the most commonly encountered form of asbestos, accounting for approximately 95% of the asbestos in the United States and a similar proportion in other countries.
Chrysotile is resistant to even strong bases (asbestos is thus stable in high pH pore water of Portland cement), but the fibres are attacked by acids: the magnesium ions are selectively dissolved, leaving a silica skeleton. It is thermally stable up to around 550 °C (1,022 °F)
101
Permanent magnets are made of high carbon steel and
[A]. 15% of cobalt
[B]. 20% of cobalt
[C]. 35% of cobalt
[D]. 45% of cobalt. @
Permanent magnets are made of high carbon steel and
[A]. 15% of cobalt
[B]. 20% of cobalt
[C]. 35% of cobalt
[D]. 45% of cobalt. @
102
Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following:
[A]. Alumina @
[B]. Lime
[C]. Ironoxide
[D]. Magnesia.
Pick up the constituent of good brick earth whose excess causes the raw bricks shrink and warp during drying and burning, from the following:
[A]. Alumina @
[B]. Lime
[C]. Ironoxide
[D]. Magnesia.
103
Commonly used thinner in
```
[A]. lacquer paints, is alcohol
[B]. cellulose paints is ethyle acetate
[C]. oil paints, is naptha
[D]. distemper, is water
[E]. all the above. @
```
Commonly used thinner in
```
[A]. lacquer paints, is alcohol
[B]. cellulose paints is ethyle acetate
[C]. oil paints, is naptha
[D]. distemper, is water
[E]. all the above. @
```
104
Blister steel
```
[A]. is obtained by cementation process
[B]. is full of fissures and cavities
[C]. can not be forged
[D]. can be easily welded
[E]. all the above. @
```
Blister steel
```
[A]. is obtained by cementation process
[B]. is full of fissures and cavities
[C]. can not be forged
[D]. can be easily welded
[E]. all the above. @
```
105
The most important constituent of varnish, is
[A]. drier
[B]. solvent
[C]. resin
[D]. all the above. @
The most important constituent of varnish, is
[A]. drier
[B]. solvent
[C]. resin
[D]. all the above. @
106
For making fly-ash building bricks, the following mix of fly-ash, sand and lime, is
[A]. 80 : 13 : 7 @
[B]. 70 : 20 : 10
[C]. 60 : 35 : 5
[D]. none of these.
The raw materials for Fly Ash Bricks are:
```
Material ------ Mass
Fly ash ------ 60%
Sand/Stone dust ------ 30%
Ordinary Portland Cement/(Lime+Gypsum) ------10%
Total formula of material ------100%
```
The strength of fly ash brick manufactured with the above compositions is normally of the order of 7.5 N/mm2 to 10 N/mm2.
Fly ash bricks are lighter and stronger than clay bricks.
107
The specific gravity of marble, is
```
[A]. 2.50
[B]. 2.60
[C]. 2.66
[D]. 2.72 @
[E]. 3.00.
```
```
Granite ----> 2.60 - 2.70.
Dolerite ----> 3.00 - 3.05.
Sandstone ----> 2.00 - 2.60.
Shale ----> 2.00 - 2.40.
Limestone ----> 2.20 - 2.60.
Dolomite ----> 2.50 - 2.60.
Quartzite ----> 2.65.
```
108
The curved swellings from the growth of layers or wounds left after branches are cut off in an irregular manner, are known as
[A]. knots
[B]. rindgalls @
[C]. burls
[D]. none of these.
Rind gall definition is - a defect in timber caused by the growth of annual layers of wood over a bruise in the bark.
Knots are cut or broken off limbs or sprout branches, green or dead, protruding, flush, or depressed, but with exposed sound or rotten wood.
So, the Answer is Rindgall.
109
Forge pig may be converted to wrought iron by
[A]. rolling
[B]. pudding @
[C]. shingling
[D]. refining.
Forge pig may be converted to wrought iron by
[A]. rolling
[B]. pudding @
[C]. shingling
[D]. refining.
110
Bitumen may be dissolved in
```
[A]. carbondioxide
[B]. water
[C]. sodium chloride
[D]. carbon disulphide @
[E]. none of these.
```
Bitumen may be dissolved in
```
[A]. carbondioxide
[B]. water
[C]. sodium chloride
[D]. carbon disulphide @
[E]. none of these.
```
111
Whitworth compressed steel is obtained when molten steel is subjected to a pressure of
```
[A]. 5 kg/mm2
[B]. 9 kg/mm2 @
[C]. 13 kg/mm2
[D]. 15 kg/mm2
[E]. 10 kg/mm2.
```
Whitworth compressed steel is obtained when molten steel is subjected to a pressure of
```
[A]. 5 kg/mm2
[B]. 9 kg/mm2 @
[C]. 13 kg/mm2
[D]. 15 kg/mm2
[E]. 10 kg/mm2.
```
112
Asbestos
```
[A]. is an excellant insulator for heat and electricity
[B]. is fire-proof and acid proof
[C]. has sp. gravity equal to 3.10
[D]. is smooth like glass and silk
[E]. All the above. @
```
Asbestos
```
[A]. is an excellant insulator for heat and electricity
[B]. is fire-proof and acid proof
[C]. has sp. gravity equal to 3.10
[D]. is smooth like glass and silk
[E]. All the above. @
```
113
The sequence of refractory materials according to increasing melting points is :
[A]. Dolomite, Magnesia, Bauxite, Chromite
[B]. Bauxite, Chromite, Dolomite, Magnesia @
[C]. Magnesia, Bauxite, Dolomite, Chromite.
The sequence of refractory materials according to increasing melting points is :
[A]. Dolomite, Magnesia, Bauxite, Chromite
[B]. Bauxite, Chromite, Dolomite, Magnesia @
[C]. Magnesia, Bauxite, Dolomite, Chromite.
114
Laterite is a/an
[A]. volcanic rock
[B]. argillaceous rock @
[C]. calcareous rock
[D]. silicious rock.
Slate, laterite, kaoline are the argillaceous rock.
115
The most valuable timber may be obtained from
[A]. chir
[B]. shisham
[C]. sal
[D]. teak. @
Teak wood is most valuable as it is used in furniture.
For railways sleepers generally, deodar is used.
& shishum strongest among all.
116
Pick up the correct statement from the following:
[A]. Blisters in the finished wrought iron, are caused due to the reaction between oxide of iron and carbon
[B]. The edges of a finished wrought iron, are rough due to red shortage
[C]. Pig iron (charcoal) is manufactured from magnetic ore (Fe3O4)
[D]. For the manufacture of wrought iron, non-sulphurous fuel is not necessary
[E]. All the above. @
Pick up the correct statement from the following:
[A]. Blisters in the finished wrought iron, are caused due to the reaction between oxide of iron and carbon
[B]. The edges of a finished wrought iron, are rough due to red shortage
[C]. Pig iron (charcoal) is manufactured from magnetic ore (Fe3O4)
[D]. For the manufacture of wrought iron, non-sulphurous fuel is not necessary
[E]. All the above. @
117
Which one of the following is used for preparing porcelain
```
[A]. clay
[B]. feldspar
[C]. quartz
[D]. minerals
[E]. All of these. @
```
Which one of the following is used for preparing porcelain
```
[A]. clay
[B]. feldspar
[C]. quartz
[D]. minerals
[E]. All of these. @
```
118
Laterite is found in
[A]. U.P. @
[B]. Punjab
[C]. West Bengal
[D]. Kerala.
Laterite soil generally found in Kerala, Karnataka, Tamilnadu, and MP. And also found in hilly areas Asam, Meghalaya.
119
Lacquer is
[A]. oil paint
[B]. distemper
[C]. spirit varnish @
[D]. none to these.
Lacquer is
[A]. oil paint
[B]. distemper
[C]. spirit varnish @
[D]. none to these.
120
Upto a maximum of 72% of iron, is available in
```
[A]. Magnetite @
[B]. Red haemetite
[C]. Limonite
[D]. Siderite
[E]. Iron pyrites.
```
```
Magnetite 72%.
Red haemetite 69%.
Limonite 59%.
Pyrites 48%.
Siderite 40%.
```
121
Pig iron made from heamatite ores free from sulphur, phosphorus and copper, is known as
```
[A]. Bessemer pig @
[B]. Grey or foundry pig
[C]. White or forge pig
[D]. Mottled pig
[E]. All the above.
```
Pig iron made from heamatite ores free from sulphur, phosphorus and copper, is known as
```
[A]. Bessemer pig @
[B]. Grey or foundry pig
[C]. White or forge pig
[D]. Mottled pig
[E]. All the above.
```
122
Pick up the correct statement from the following:
[A]. Blistering may be cured by applying water paint finished with oil paint dried with a little copal varnish
[B]. Cracked paints may be cured by removing paint and giving a fresh coat of paint
[C]. Crawling paints may be cured by sand preparing the surface and giving a fresh coat with plenty of turps
[D]. All the above. @
Pick up the correct statement from the following:
[A]. Blistering may be cured by applying water paint finished with oil paint dried with a little copal varnish
[B]. Cracked paints may be cured by removing paint and giving a fresh coat of paint
[C]. Crawling paints may be cured by sand preparing the surface and giving a fresh coat with plenty of turps
[D]. All the above. @
123
The material generally not used as extender in paints, is
[A]. powdered silica
[B]. gypsum
[C]. talc
[D]. zinc white. @
The material generally not used as extender in paints, is
[A]. powdered silica
[B]. gypsum
[C]. talc
[D]. zinc white. @
124
Pick up the non-inflammable plastic from the following:
[A]. Cellulose acetate plastics
[B]. Polyvinyl chloride plastics @
[C]. Phenol formaldehyde plastic
[D]. Urea formaldehyde plastic.
Pick up the non-inflammable plastic from the following:
[A]. Cellulose acetate plastics
[B]. Polyvinyl chloride plastics @
[C]. Phenol formaldehyde plastic
[D]. Urea formaldehyde plastic.
125
For light and ornamental casting, the most unsuitable pig iron, is
[A]. Bessemer pig
[B]. Grey or foundry pig
[C]. White or forge pig
[D]. Mottled pig. @
Mottled pig- irregular pattern and form in many colours, Not in proper shape. That's why not suitable for ornamental casting.
126
The melting point of silica is :
[A]. 1570°C
[B]. 1630°C
[C]. 1730°C @
[D]. 1850°C.
Melting point is 1710.
| Boiling point is 2230.
127
Plastic asphalt is
[A]. used as a water proofing layer over roof
[B]. a mixture of cement and asphalt @
[C]. a natural asphalt
[D]. a refinery product.
Plastic asphalt = a mixture of cement and asphalt.
Mastic asphalt = used for damp proof and waterproof layer.
Plastic bitumen = used for filling cracks in masonry structure using asbestos powder as a filler.
128
For obtaining vinyl chloride acetate, the method used, is
[A]. addition polymerization
[B]. condensation polymerization
[C]. co-polymerization @
[D]. none of these.
For obtaining vinyl chloride acetate, the method used, is
[A]. addition polymerization
[B]. condensation polymerization
[C]. co-polymerization @
[D]. none of these.
129
The yield strength and tensile strength of low carbon steel may be improved by the addition of
```
[A]. manganese
[B]. chromium
[C]. nickel
[D]. vanadium @
[E]. tungsten.
```
Vanadium (V) - It increases the yield strength and the tensile strength of carbon steels. Small amount of Vanadium increases the strength of steels significantly. It promotes fine grain and elevates coarsening temperature of austenite. The impact transition temperature increases when vanadium is added.
130
Bitumen completely dissolves in
```
[A]. carbon bisulphide
[B]. chloroform
[C]. benzol
[D]. coaltar
[E]. All of these. @
```
Bitumen completely dissolves in
```
[A]. carbon bisulphide
[B]. chloroform
[C]. benzol
[D]. coaltar
[E]. All of these. @
```
131
Based on its dry weight, a freshly felled tree may contain water
[A]. 25%
[B]. 50%
[C]. 75%
[D]. 100%. @
Based on its dry weight, a freshly felled tree may contain water
[A]. 25%
[B]. 50%
[C]. 75%
[D]. 100%. @
132
Pick up the correct statement from the following:
[A]. The percentage of absorption for firebricks varies from 5 to 10
[B]. The percentage of silica in silica bricks is to the extent of about 95 to 97 percent
[C]. Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material
[D]. The compressive strength of silica bricks is about 150 kg/cm2
[E]. All the above. @
Pick up the correct statement from the following:
[A]. The percentage of absorption for firebricks varies from 5 to 10
[B]. The percentage of silica in silica bricks is to the extent of about 95 to 97 percent
[C]. Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material
[D]. The compressive strength of silica bricks is about 150 kg/cm2
[E]. All the above. @
133
Spirit varnish generally consists of
```
[A]. oil, wax and resin
[B]. alcohol, wax and turpentine
[C]. pigment and synthetic resin
[D]. spirit and shellac @
[E]. none of these.
```
Spirit varnish generally consists of
```
[A]. oil, wax and resin
[B]. alcohol, wax and turpentine
[C]. pigment and synthetic resin
[D]. spirit and shellac @
[E]. none of these.
```
134
Pick up the correct statement from the following:
[A]. Roasting is not necessary if iron ore is an oxide
[B]. Impurities float on the molten iron as slag
[C]. The slag contains lime about 45%
[D]. The molten iron is made to run, in a long channel formed in sand called 'sow'
[E]. All the above. @
Pick up the correct statement from the following:
[A]. Roasting is not necessary if iron ore is an oxide
[B]. Impurities float on the molten iron as slag
[C]. The slag contains lime about 45%
[D]. The molten iron is made to run, in a long channel formed in sand called 'sow'
[E]. All the above. @
135
Acrylic is the name of
[A]. cellulose resin
[B]. alkyd resin
[C]. methyl metha crylate @
[D]. cumarone-indene.
Acrylic is the name of
[A]. cellulose resin
[B]. alkyd resin
[C]. methyl metha crylate @
[D]. cumarone-indene.
136
Lime mortar is generally made with
```
[A]. quick lime
[B]. fat lime
[C]. hydraulic lime @
[D]. plain lime
[E]. none of these.
```
Lime mortar is generally made with
```
[A]. quick lime
[B]. fat lime
[C]. hydraulic lime @
[D]. plain lime
[E]. none of these.
```
137
Pick up the correct statement from the following:
[A]. Melamine is obtained from calcium carbide
[B]. Formaldehyde is prepared synthetically from methane
[C]. The melamine when reacted with formaldehyde forms the melamine-formaldehyde resin
[D]. The plastics made from melamine formaldehyde resin, are used for electrical insulators
[E]. All the above. @
Pick up the correct statement from the following:
[A]. Melamine is obtained from calcium carbide
[B]. Formaldehyde is prepared synthetically from methane
[C]. The melamine when reacted with formaldehyde forms the melamine-formaldehyde resin
[D]. The plastics made from melamine formaldehyde resin, are used for electrical insulators
[E]. All the above. @
138
Steel contains carbon approximately
[A]. 1.50% to 5.6%
[B]. 0.05% to 1.75% @
[C]. 0.25%
[D]. none to these.
Steel Types.
Wrought iron contains ca - 0.05 to 0.15.
Cast iron 1.7 to 4.5.
Steel contains 0.25.
139
If the ore impurities is
A. clay, lime stone is used as flux
B. lime stone, clay is used as flux
C. quartz, lime stone and argallaceous iron ores are used as flux
D. All the above. @
If the ore impurities is
A. clay, lime stone is used as flux
B. lime stone, clay is used as flux
C. quartz, lime stone and argallaceous iron ores are used as flux
D. All the above. @
140
Red short iron cracks when bent due to the presence of
[A]. sulphur @
[B]. carbon
[C]. phosphorus
[D]. silicon.
Red hot iron is otherwise know as hot metal (product from blast furnace) impurities in hot metal are:
Silica-imparts non-homoginity.
Carbon-brittleness.
Sulphur-surface cracks.
141
The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is
```
[A]. 20
[B]. 15
[C]. 10
[D]. 5
[E]. 0. @
```
If this added then colour property is change of white cement, for white purpose these should be zero.
142
For a 50 kg cement bag water required, is
```
[A]. 16.5 litres
[B]. 18.5 litres
[C]. 20.5 litres
[D]. 22.5 litres @
[E]. 25 litres.
```
if the water-cement ratio is specified as 0.45, the quantity of mixing water required per 50-kg bag of cement is 0.45 - 50 = 22.5 lt or kg.
143
The presence of sand in brick earth prevents:
[A]. cracking of bricks
[B]. shrinkage of bricks
[C]. warping of bricks @
[D]. none of these.
Silica or sand (50-60%) in bricks, prevents Shrinkage, Warping and Cracking.
All 3 are Correct.
144
The property by virtue of which lime sets under water, is known as
[A]. slacking
[B]. setting
[C]. hydraulicity @
[D]. calcining.
Slacking is process of chemical combination of quick lime with water.
Lime sets under water because of Hydraulicity.
145
Percentage content of silica in window glass, is
[A]. 40 to 45
[B]. 50 to 55
[C]. 60 to 65
[D]. 70 to 75. @
Percentage content of silica in window glass, is
[A]. 40 to 45
[B]. 50 to 55
[C]. 60 to 65
[D]. 70 to 75. @
146
The coefficient of hardness of stones used in road work should be greater than
[A]. 10
[B]. 12
[C]. 15
[D]. 17. @
The coefficient of hardness of stones used in road work should be greater than
[A]. 10
[B]. 12
[C]. 15
[D]. 17. @
147
The steel used for the manufacture of rails, is
[A]. Bessemer steel @
[B]. mild steel
[C]. cast steel
[D]. stainless steel
The steel used for the manufacture of rails, is
[A]. Bessemer steel @
[B]. mild steel
[C]. cast steel
[D]. stainless steel
148
Basalt is
[A]. sedimentary rock
[B]. metamorphic rock
[C]. extrusive igneous rock @
[D]. intrusive igneous rock.
Basalt is a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals. It most commonly forms as an extrusive rock, such as a lava flow, but can also form in small intrusive bodies, such as an igneous dike or a thin sill. It has a composition similar to gabbro.
149
Pig iron obtained from the furnance which is properly provided with fuel at a very high temperature, is called
```
[A]. Bessemer pig
[B]. Grey or foundry pig @
[C]. White or forge pig
[D]. Mottled pig
[E]. None of the above.
```
High temp - grey pig.
| Low temp - white pig.
150
Refractory bricks are
[A]. neutral refractory bricks
[B]. acid refractory bricks
[C]. basic refractory bricks
[D]. all the above. @
Refractory bricks are
[A]. neutral refractory bricks
[B]. acid refractory bricks
[C]. basic refractory bricks
[D]. all the above. @
151
Porcelain is used as :
```
[A]. sanitary wares
[B]. electric insulators
[C]. storage vessels
[D]. reactor chambers
[E]. All of the above. @
```
Porcelain is used as :
```
[A]. sanitary wares
[B]. electric insulators
[C]. storage vessels
[D]. reactor chambers
[E]. All of the above. @
```
152
Magnese steels
[A]. are non-magnetic
[B]. possess high electrical resistance
[C]. possess low coefficient of expansion
[D]. are used for the manufacture of rails
[E]. all the above. @
Magnese steels
[A]. are non-magnetic
[B]. possess high electrical resistance
[C]. possess low coefficient of expansion
[D]. are used for the manufacture of rails
[E]. all the above. @
153
Pick up the metal refractory from the following:
[A]. Molyblendum
[B]. Tungsten
[C]. Zicronium
[D]. All of these. @
Pick up the metal refractory from the following:
[A]. Molyblendum
[B]. Tungsten
[C]. Zicronium
[D]. All of these. @
154
Lime putty
```
[A]. is made from hydraulic lime
[B]. is made by adding lime to water
[C]. can be used only upto three days
[D]. may be obtained from drying lime water mix passing through IS sieve No. 300
[E]. all of above. @
```
Lime putty
```
[A]. is made from hydraulic lime
[B]. is made by adding lime to water
[C]. can be used only upto three days
[D]. may be obtained from drying lime water mix passing through IS sieve No. 300
[E]. all of above. @
```
155
Lime putty
```
[A]. is made from hydraulic lime
[B]. is made by adding lime to water
[C]. can be used only upto three days
[D]. may be obtained from drying lime water mix passing through IS sieve No. 300
[E]. all of above. @
```
Lime putty
```
[A]. is made from hydraulic lime
[B]. is made by adding lime to water
[C]. can be used only upto three days
[D]. may be obtained from drying lime water mix passing through IS sieve No. 300
[E]. all of above. @
```
156
The method of addition polymerization is used for obtaining:
```
[A]. polythylene
[B]. polypropylene
[C]. polyvinylchloride
[D]. polystyrene
[E]. All of these. @
```
The method of addition polymerization is used for obtaining:
```
[A]. polythylene
[B]. polypropylene
[C]. polyvinylchloride
[D]. polystyrene
[E]. All of these. @
```
157
Pick up the correct statement from the following:
[A]. The lime in excess makes the cement unsound and causes the cement to expand and disintegrate
[B]. The silica in excess makes the cement stronger but its setting time also increases
[C]. The excess amount of alumina weakens the cement
[D]. The addition of gypsum increases the initial setting time of cement
[E]. All the above. @
Pick up the correct statement from the following:
[A]. The lime in excess makes the cement unsound and causes the cement to expand and disintegrate
[B]. The silica in excess makes the cement stronger but its setting time also increases
[C]. The excess amount of alumina weakens the cement
[D]. The addition of gypsum increases the initial setting time of cement
[E]. All the above. @
158
Asbestos
[A]. is a natural fibrous mineral substance
[B]. is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
[C]. contains iron oxide and alumina
[D]. all the above. @
Asbestos
[A]. is a natural fibrous mineral substance
[B]. is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
[C]. contains iron oxide and alumina
[D]. all the above. @
159
Pegmatite is a/an
[A]. intrusive igneous rock @
[B]. extrusive igneous rock
[C]. sedimentary rock
[D]. metamorphic rock.
Pegmatite is a/an
[A]. intrusive igneous rock @
[B]. extrusive igneous rock
[C]. sedimentary rock
[D]. metamorphic rock.
160
The percentage of alumina and silica in good fire clay vary respectively is
[A]. 25, 75 @
[B]. 30, 70
[C]. 35, 65
[D]. All of these.
The percentage of alumina and silica in good fire clay vary respectively is
[A]. 25, 75 @
[B]. 30, 70
[C]. 35, 65
[D]. All of these.
161
Dorry's testing machine is used for
[A]. crushing test of stone
[B]. hardness test of stone @
[C]. impact test of stone
[D]. water absorption test.
Dorry's testing machine is used for
[A]. crushing test of stone
[B]. hardness test of stone @
[C]. impact test of stone
[D]. water absorption test.
162
Stones used for rubble masonry must be
[A]. soft
[B]. hard @
[C]. light
[D]. heavy.
Ornamental work - soft /light.
Retaining walls - heavy.
Rubble masonry - hard.
163
Dolomite is a lime stone which contains carbonate of magnesia upto
```
[A]. 15%
[B]. 20%
[C]. 25%
[D]. 35%
[E]. 45%. @
```
Dolomite is a lime stone which contains carbonate of magnesia upto
```
[A]. 15%
[B]. 20%
[C]. 25%
[D]. 35%
[E]. 45%. @
```
164
Priming consists of
[A]. one part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil @
[B]. 8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
[C]. one part of white lead, 8 parts of chalk and one part of linseed oil
[D]. none to these.
Priming consists of
[A]. one part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil @
[B]. 8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
[C]. one part of white lead, 8 parts of chalk and one part of linseed oil
[D]. none to these.
165
According to ISI, bitumen is classified into
```
[A]. 2 grades
[B]. 4 grades
[C]. 6 grades
[D]. 8 grades.
[E]. 10 grades. @
```
Option E is right.
Penetration, viscosity, oxide bitumen grade, bituminous binders prepration, cutback,
Fluxed, modified, emultion, asphalt, performence, natural.
As per IS 73:1992. There are six penetration grade (S35, S45, S55, S65, S90&S200). And as per Is73:2013 there are 4 viscosity grade (VG10, VG20, VG30 & VG40).
166
For high grade instruments the steel preferred to, is
[A]. cast steel @
[B]. bessemer steel
[C]. mild steel
[D]. whitworth compressed steel.
For high grade instruments the steel preferred to, is
[A]. cast steel @
[B]. bessemer steel
[C]. mild steel
[D]. whitworth compressed steel.
167
The plastics prepared from Vinyl resin are
```
[A]. odourless
[B]. non-toxic
[C]. transparent
[D]. colourless
[E]. all of these. @
```
The plastics prepared from Vinyl resin are
```
[A]. odourless
[B]. non-toxic
[C]. transparent
[D]. colourless
[E]. all of these. @
```
168
Chlorite, a green colour mineral is mainly derived from the decomposition of
[A]. augite @
[B]. biotite
[C]. horn blende
[D]. All of these.
Chlorite, a green colour mineral is mainly derived from the decomposition of
[A]. augite @
[B]. biotite
[C]. horn blende
[D]. All of these.
169
During smelting process, the combination of fuel in the furnace
[A]. forms carbon dioxide
[B]. carbon dioxide with carbon forms carbon mono-oxide
[C]. carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
[D]. all the above. @
During smelting process, the combination of fuel in the furnace
[A]. forms carbon dioxide
[B]. carbon dioxide with carbon forms carbon mono-oxide
[C]. carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
[D]. all the above. @
170
Lime stones are generally known as
[A]. aqueous rocks
[B]. sedimentary rocks
[C]. stratified rocks
[D]. all the above. @
Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in the form of the mineral calcite. It most commonly forms in clear, warm, shallow marine waters. Hence it is aqueous, sedimentary and stratified rock.
171
Acrylic sheets
[A]. possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness
[B]. are generally unaffected by most household detergents
[C]. possess the light transmission rate of 93%
[D]. are available in various shapes
[E]. all the above. @
This article is about the transparent plastic sometimes called acrylic glass. For the glass/plastic laminate often called "safety glass", see laminated glass. For the neurotoxic designer drug PMMA, commonly sold as MDMA, see Para-Methoxy-N-methylamphetamine.
172
The most commonly used base for timber painting, is
[A]. red lead
[B]. zinc white
[C]. white lead @
[D]. titanium white.
Red lead for iron surface.
White lead and zinc white for wood surfaces.
173
Pick up the most favourable condition for the rapid growth of fungus for dry rot from the following:
```
[A]. absence of sun light
[B]. dampness
[C]. presence of sap
[D]. stagnant air
[E]. All the above, @
```
The correct answer is Option E.
Reason:
Absence of sunlight indirectly means the absence of air,
Absence of air causes dampness,
Dampness = sap.
Stagnant air means no air movement in other words improper ventilation.
174
Pick up the correct statement from the following:
[A]. Styrene resin is produced from ethylene which is made from petroleum
[B]. Styrene resin is light in weight
[C]. Styrene resin transmits ultraviolet waves of light
[D]. Styrene resin is used to manufacture utensils which are unaffected by chemicals
[E]. All the above. @
Pick up the correct statement from the following:
[A]. Styrene resin is produced from ethylene which is made from petroleum
[B]. Styrene resin is light in weight
[C]. Styrene resin transmits ultraviolet waves of light
[D]. Styrene resin is used to manufacture utensils which are unaffected by chemicals
[E]. All the above. @
175
For construction of structures under water, the type of lime used, is
```
[A]. hydraulic lime @
[B]. fat lime
[C]. quick lime
[D]. pure lime
[E]. none of these.
```
For construction of structures under water, the type of lime used, is
```
[A]. hydraulic lime @
[B]. fat lime
[C]. quick lime
[D]. pure lime
[E]. none of these.
```
176
Pick up the correct statement from the following:
```
[A]. Rust is due to formation of oxides
[B]. Cast iron oxidises less
[C]. Steel oxidises most
[D]. Wrought iron oxidises moderately
[E]. All the above. @
```
Pick up the correct statement from the following:
```
[A]. Rust is due to formation of oxides
[B]. Cast iron oxidises less
[C]. Steel oxidises most
[D]. Wrought iron oxidises moderately
[E]. All the above. @
```
177
A prime coat is given to steel work with
[A]. an oxide of iron paint
[B]. a mixture of white lead and lead paint @
[C]. a special paint
[D]. cement paint.
A prime coat is given to steel work with
[A]. an oxide of iron paint
[B]. a mixture of white lead and lead paint @
[C]. a special paint
[D]. cement paint.
178
The harmonious mixing of the clay ingredients, is known as
[A]. weathering
[B]. blending @
[C]. tempering
[D]. None of these.
Tampering is a process of manufacturing brick in which 1/4 to 1/3 water by weight of clay is added to mixture, for making paste for moulding.
179
Brass is an alloy of
```
[A]. copper and zinc @
[B]. zinc and lead
[C]. tin and silver
[D]. zinc and nickel
[E]. tin and lead.
```
Brass is an alloy of
```
[A]. copper and zinc @
[B]. zinc and lead
[C]. tin and silver
[D]. zinc and nickel
[E]. tin and lead.
```
180
The wedging is adopted for quarrying costly stratified rock such as
```
[A]. laterite
[B]. marble
[C]. limestone
[D]. sandstone
[E]. All the above. @
```
The wedging is adopted for quarrying costly stratified rock such as
```
[A]. laterite
[B]. marble
[C]. limestone
[D]. sandstone
[E]. All the above. @
```
181
Second class bricks
[A]. are of dark brown colour
[B]. produce a metallic sound when struck @
[C]. are well burnt
[D]. are under burnt.
These are also fully burnt and give a clear ringing sound when struck together. Slightly irregularities in shape, size or color are accepted.
Its compressive strength shall not be less than 70 kg/cm2 and absorption value should not be greater than 22 percent when soaked for 24 hours in water.
Slight difference in the structure on fractured surfaces is admissible.
Use: For exterior work when plastering is to be done. And can also be used for interior works but they may not be used for flooring.
Note : under burnt brick is 3rd class brick.
1st- gives metallic sound.
2nd- slightly over burnt or well burnt.
3rd- underburnt.
Jahma - Dark brown colour.
182
Pick up the correct statement from the following:
[A]. Adding 5% to 6% of moisture content by weight, increases the volume of dry sand from 18% to 38%
[B]. The bulking of fine sand is more than that of coarse sand
[C]. If the percentage content of moisture exceeds 10%, increase in bulk of sand starts increasing
[D]. The volume of fully saturated sand equals that of dry sand
[E]. All the above. @
Pick up the correct statement from the following:
[A]. Adding 5% to 6% of moisture content by weight, increases the volume of dry sand from 18% to 38%
[B]. The bulking of fine sand is more than that of coarse sand
[C]. If the percentage content of moisture exceeds 10%, increase in bulk of sand starts increasing
[D]. The volume of fully saturated sand equals that of dry sand
[E]. All the above. @
183
Teak wood is suitable for
[A]. sports articles
[B]. furnitures @
[C]. railway sleepers
[D]. all the above.
Teak wood suitable for furniture.
Mulberry wood suitable for Sports Goods.
Deodar is suitable for railways sleepers.
184
Plywood is normally available
[A]. 1 mm thick
[B]. 2 mm thick
[C]. 2 to 3 mm thick
[D]. 3 mm to 4 mm thick. @
The common plywood thickness ranges from 3.2 mm to 21 mm.
185
In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they
[A]. split easily
[B]. are affected by moisture
[C]. both (a) and (b) @
[D]. none of these.
In stone masonry, if stones are so placed that their layers are parallel to the direction of load, they
[A]. split easily
[B]. are affected by moisture
[C]. both (a) and (b) @
[D]. none of these.
186
In case of Raymond pile
[A]. lengths vary from 6 m to 12 m
[B]. diameter of top of piles varies from 40 cm to 60 cm
[C]. diameter of pile at bottom varies from 20 cm to 28 cm
[D]. thickness of outer shell depends upon pile diameter
[E]. all the above. @
The Raymond pile, invented in 1897, is one of the oldest pile types, but still used in several countries, especially North America.
The Raymond pile is also known as the "Step-taper pile", due to the special steel shell and the typical mandrel. Step-tapered piles are formed from 1. 2, 2. 4, and 4. 9 m straight-sided, thin-walled segments of spirally corrugated steel. Each successive pile.
Element decreases over a length of 2. 44 m by 25 mm in diameter. The minimum diameter (at the pile toe) is 0, 212 m. Step-tapered piles can be driven to a maximum depth of about 40 m. The 40 m long pile has a tip diameter of 0, 212 m and a shaft diameter (at the ground surface) of 0, 438 m.
The pile is installed using a unique driving process. A specially shaped mandrel is inserted into a thin-walled pile tube and the driving force is transmitted along the casing and to the bottom of the pile. In this way, the wall thickness of the pile tube can be kept to a minimum.
