Important MCQ on Building Materials & Concrete Technology
1) Granite is an example of
(a) aqueous rocks
(b) sedimentary rocks
(c) metamorphic rocks
(d) igneous rocks ✓
2) The strength and durability of concrete depends upon
(a) size of aggregates
(b) grading of aggregates
(c) moisture contents of aggregates
(d) all of these ✓
3) The breaking up of cohesion in a mass of concrete is called
(a) workability
(b) bleeding
(c) segregation✓
(d) creep
4) The workability of concrete is defined as the
(a) ease with which it can be mixed, transported and placed in position in a homogeneous state✓
(b) breaking up of cohesion in a mass of concrete
(c) separation of water or water-cement mixture from the freshly mixed concrete
(d) none of the ab
5) The continuous strain, which the concrete undergoes due to application of external loads, is called
(a) workability
(b) bleeding
(c) segregation
(d) creep✓
6) The type of lime used in lime concrete is
(a) fat lime
(b) poor lime
(c) slaked lime
(d) hydraulic lime✓
7) The lime concrete has
(a) less✓
(b) more
(c) same
8) Ferro-concrete is another name given to
(a) plain cement concrete
(b) reinforced cement concrete✓
(c) pre-stressed cement concrete
(d) none of these
9) The cement concrete in which high compressive stresses are artificially induced before its actual use, is called
(a) plain cement concrete
(b) reinforced cement concrete
(c) prestressed cement concrete✓
(d) lime concrete
10) For heat and sound insulation purposes, we shall use
(a) vacuum concrete
(b) air-entrained concrete
(c) saw dust concrete
(d) both (b) and (c) ✓
11) The removal of excess air after placing concrete helps in increasing the strength of concrete by
(a) 15 to 20%✓
(b) 20 to 30%
(c) 30 to 50%
(d) 50 to 70%
12) The cement concrete prepared by mixing aluminium in it, is called
(a) air-entrained concrete
(b) cellular concrete
(c) aerated concrete
(d) any one of the above✓
13) The sound absorption coefficient of light weight concrete is nearly
(a) twice✓
(b) three times
(c) four times
(d) six times
14) Laterite is chemically classified as
(a) caleareous rock
(b) argillaceous rock✓
(c) sillcious rock
(d) metamorphic rock
15) Which of the following is an example of agrillaceous rock?
(a) Kaolin
(b) Slate
(c) Laterite
(d) all of these✓
16) Which of the following is an example of silicious rock?
(a) Granite
(b) Gneiss
(c) Quartzite
(d) all of these✓
17) Marble is an example of
(a) aqueous rock
(b) metamorphic rock✓
(c) sedimentary rock
(d) igneous rock
18) Granite is mainly composed of
(a) quartz and mica
(b) felspar and mica
(c) quartz and felspar
(d) quartz, felspar and mica✓
19) Sandstone consists of
(a) quartz and lime
(b) quartz and silica
(c) quartz, lime and silica✓
(d) silica, lime and alumina
20) The compressive strength of granite is
(a) 50 to 70 MN/m2
(b) 70 to 130 MN/m2✓
(c) 130 to 170 MN/m2
(d) 170 to 200 MN/m2
21) A good building stone is one which does not absorb more than
(a) 5%✓
(b) 10%
(c) 15%
(d) 25%
22) Which of the following statement is wrong?
(a) The concrete can not be pumpe(d)
(b) The concrete should have maximum creep.
(c) The concrete structures can be put to use immediately ater their construction.
(d) all of the above✓
23) The material used as an ingredient of concrete is usually
(a) cement
(b) aggregate
(c) water
(d) all of these✓
24) A suitable admixture added at the time of preparing the concrete mix, makes the concrete.
(a) water proof
(b) acid proof
(c) highly strong
(d) all of these✓
25) The function of aggregates in concrete is to serve as
(a) binding material
(b) filler✓
(c) catalyst
(d) all of these
26) Calcareous material used in the manufacture of cement consists of
(a) lime stone
(b) chalk
(c) shells
(d) all of these✓
27) In the manufacture of cement, the dry or wet mixture of calcareous and argillaceous materials is burnt at a temperature between
(a) 900’C to 1000’C
(b) 1000’C to 1200’C
(c)1200’C to 1500’C
(d) 1500’C to 1600’C✓
28) Argillaceous materials contain
(a) calcium
(b) Lime
(c)alumina✓
29) The proportion of lime, silica, alumina and iron oxide in a good Portland cement should be
(a) 63 : 22 : 6 : 3✓
(b) 62 : 22 : 3 : 6
(c) 22 : 63 : 6 : 3
(d) 22 : 63 : 3 : 6
30) The gypsum is added to the cement for
(a) providing high strength to the cement
(b) controlling the initial setting time of cement✓
(c) lowering the clinkering temperature of cement
(d) all of the above
31) Lime when added in excess quantity
(a) makes the cement unsound
(b) cuses the cement to expand and disintegrate
(c) lowers the clinkering temperature of cement
(d) both (a) and (b) ✓
32) In order to provide colour, hardness and strength to the cement, the ingredient used is
(a) lime
(b) silica
(c) alumina
(d) iron oxide✓
33) After the final grinding, the cement is sieved through IS sieve number
(a) 9✓
(b) 12
(c) 24
(d) 48
34) Efflorescence in cement is caused due to the excess of
(a) silica
(b) lime
(c) alkalis ✓
(d) iron oxide
35) Tricalcium silicate develops strength in cemet for first 7 days.
(a) Yes✓
(b) No
36) Which of the following statement is correct?
(a) The high early strength is obtained by addin tricalcium silicate in cement.
(b) The dicalcium silicate provides good ultimate strength to cement.
(c) The tetra calcium alumino ferrite has poor cementing value.
(d) all of the above✓
37) Rapid hardening cement is used
(a) where high early strength is desired
(b) where form work is to be removed as early as possible
(c) for constructing road pavements
(d) all of the above✓
38) The cement, widely used in retaining walls, is
(a) rapid hardening cement
(b) low heat cement✓
(c) sulphate resisting cement
(d) ordinary Portland cement
39) Which of the following cements is expected to have the highest compressive strength after 3 days.
(a) ordinary Portland cement
(b) rapid hardening cement
(c) high alumina cement✓
(d) sulphate resisting cement
40) For a structure subjected to the action of sea water, the cement used is
(a) rapid hardening cement
(b) low heat cement
(c) high alumina cement✓
(d) sulphate resisting cement
41) The strength of concrete using air entraining cement gets reduced by
(a) 5 to 10%
(b) 10 to 15%✓
(c) 15 to 20%
(d) 20 to 25%
42) "Colocrete" is the commercial term for
(a) high alumina cement
(b) coloured cement✓
(c) low heat cement
(d) rapid hardening cement
43) Pezzolana is essentially a silicious material containing clay upto
(a) 20%
(b) 40%
(c) 60%
(d) 80%✓
44) The degree of grinding of cement is called
(a) fineness✓
(b) soundness
(c) impact value
(d) bulking
45) The fineness of cement is measured in terms of
(a) percentage weight retained on IS sieve number 9
(b) surface area in cm2 per gram of the cement
(c) either (a) or (b) ✓
(d) none of these
46) Too much finencess of cement
(a) results cracks in concrete
(b) generates greater heat
(c) develops early strength
(d) both (a) and (b) ✓
47) The setting time of cement is the governing factor for
(a) mixing of concrete
(b) placing of concrete
(c) compaction of concrete
(d) all of these✓
48) According to IS : 269 - 1976, the requirement of an ordinary Portland cement is that
(a) the residue does not exceed 10% when sieved through IS sieve No. 9
(b) its expansion is not more than 10 mm for unaerated cement
(c) its initial setting time is not less than 30 minutes
(d) all of the above✓
49) The compressive strength of an ordinary Portland cement (1 : 3 cement mortar cube) after 7 days test should not be less than
(a) 11 N/mm2
(b) 17.5 N/mm2✓
(c) 22 N/mm2
(d) 27.5 N/mm2
50) Vicat's apparatus is used to perform
(a) fineness test
(b) soundness test
(c) consistency test ✓
(d) compressive strength test
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| Important MCQ on Building Materials & Concrete Technology |
51) The knowledge of a standard consistency of a cement paste is essential to perform
(a) setting time test
(b) soundness test
(c) compressive strength test
(d) all of these✓
52) In Vicat's apparatus, the diameter of Vicat plunger is
(a) 5 mm
(b) 10 mm✓
(c) 15 mm
(d) 20 mm
53) The percentage of water for making a cement paste of normal consistency varies from
(a) 15 to 25%
(b) 25 to 35%✓
(c) 35 to 50%
(d) 50 to 60%
54) To perform the initial setting time test, the water is added to the cement at the rate of
(a) 0.72 P
(b) 0.78 P
(c) 0.85 P✓
(d) 0.95 P
55) Le-chatelier apparatus is used to perform
(a) fineness test
(b) soundness test✓
(c) consistency test
(d) compressive strength test
56) To perform the soundness test, the water is added to the cement at the rate of 0.72 P by weight of cement, where P is the percentage of water required for normal consistency paste.
(a) Correct✓
(b) Incorrect
57) Initial setting time of ordinary Portland cement is
(a) 15 min
(b) 30 min✓
(c) 60 min
(d) 10 h
58) According to Indian standard specifications for the compressive strength test of cement, the cement and standard sand mortar in the ratio of
(a) 1 : 1
(b) 1 : 2
(c) 1 : 3✓
(d) 1 : 4
59) During field test, the cement is said to be pure and of good quality when
(a) the colour of cement is uniformly greenish grey
(b) a handful of cement, thrown into a bucket of water, floats
(c) hand is thrusted into a bag of cement, it feels cool
(d) all of the above✓
60) The inert mineral material used for the manufacture of mortars and concretes is
(a) cement
(b) water
(c) aggregate✓
(d) admixture
61) According to IS : 383 - 1970, a good a aggregate for concrete construction should be
(a) chemically inert
(b) sufficiently strong
(c) sufficiently hard and durable
(d) all of these✓
62) For reinforced concrete, the aggregate used is
(a) sand
(b) gravel
(c) crushed rock
(d) all of these✓
63) The material having particle size varying from 0.002 to 0.06 mm is termed as
(a) silt✓
(b) clay
(c) sand
(d) none of these
64) An aggregate is said to be
(a) coarse
(b) fine
(c) cyclopean✓
65) The aggregate which pass through 75 mm IS sieve and entirely retain on 4.75 mm IS sieve is known as
(a) cyclopean aggregate
(b) coarse aggregate✓
(c) fine aggregate
(d) all-in-aggregate
66) The maximum particle size of coarse aggregate is
(a) 45 mm
(b) 65 mm
(c) 55 mm
(d) 75 mm✓
67) The maximum particle size of fine aggregate is
(a) 0.5 mm
(b) 4.75 mm✓
(c) 5.85 mm
(d) 6.5 mm
68) The aggregate which pass through 4.75 mm IS sieve and entirely retain on 75 micron IS sieve is called
(a) cyclopean aggregate
(b) coarse aggregate
(c) fine aggregate✓
(d) all-in-aggregate
69) The minimum particle size of coarse aggregate is
(a) 2.5 mm
(b) 4.75 mm✓
(c) 5.85 mm
(d) 6.5 mm
70) The minimum particle size of fine aggregate is
(a) 0.0075 mm
(b) 0.075 mm✓
(c) 0.75 mm
(d) 0.95 mm
71) The value of bulk density of the aggregate depends upon
(a) size distribution of aggregate
(b) shape of aggregate
(c) specific gravity of aggregate
(d) all of these✓
72) The sum of percentages of all deleterious materials in the aggregate shall not exceed
(a) 5%✓
(b) 10%
(c) 15%
(d) 20%
73) The resistance of an aggregate to compressive forces is known as
(a) crushing value✓
(b) impact value
(c) abrasion value
(d) none of these
74) The resistance of an aggregate to wear is known as
(a) shear value
(b) crushing value
(c) abrasion value✓
(d) impact value
75) The resistance of an aggregate to the effect of hydration of cement and weather is called
(a) crushing value
(b) impact value
(c) abrasion value
(d) soundness✓
76) Bulking of sand is
(a) compacting of sand
(b) segregating sand of particular size
(c) increase in volume of sand due to presence of moisture upto certain extent✓
(d) none of the above
77) With the moisture content of 5 to 10% by weight, the bulking of sand is increased by
(a) 20%
(b) 30%
(c) 40%
(d) 50%✓
78) The value of finencess modulus for fine sand may range between
(a) 1.1 to 1.3
(b) 1.3 to 1.6
(c) 1.6 to 2.2
(d) 2.2 to 2.6✓
79) If the fineness modulus of sand is 3, then the sand is graded as
(a) very fine sand
(b) fine sand
(c) medium sand
(d) coarse sand✓
80) If sea water is used for preparing concrete mix, it
(a) reduces strength
(b) corrodes steel reinforcement
(c) causes efflorescence
(d) all of these✓
81) The rule of water cement ratio was established by
(a) Duff Abram✓
(b) Plowmn
(c) W. Simms
(d) Dr. Karl Terzaghi
Hydration of cement is due to the chemical action of water with
(a) dicalcium silicate
(b) tricalcium silicate
(c) tricalcium aluminate
(d) all of these✓
82) The development of first 28 days strength is on account of the hydration of
(a) dicalcium silicate
(b) tricalcium silicate✓
(c) tricalcium aluminate
(d) tetra calcium alumino ferrite
83) For the improvement of workability of concrete, the shape of aggregate recommended is
(a) irregular
(b) angular
(c) round✓
(d) flaky
84) The use of air-entraining agents in concrete
(a) increases workability of concrete
(b) decreases bleeding
(c) decreases strength
(d) all of these✓
85) The workability of concrete is expressed by
(a) water-cement ratio
(b) slump value
(c) compaction factor
(d) both (a) and (b) ✓
86) The workability of concrete can be improved by adding
(a) hydrated lime
(b) flyash
(c) calcium chloride
(d) all of these✓
87) The steel mould used for slump test is in the form of a
(a) cube
(b) cylinder
(c) frustrum of a cone✓
(d) none of these
88) The top diameter, bottom diameter and height of the mould used for slump test are respectively
(a) 100 mm, 200 mm, 300 mm✓
(b) 200 mm 100 mm, 300 mm
(c) 200 mm, 300 mm, 100 mm
(d) 100 mm, 300 mm, 200 mm
89) For high degree of workability, the slump value should vary between
(a) 0 to 25 mm
(b) 25 to 50 mm
(c) 50 to 80 mm
(d) 80 to 100 mm✓
90) A fine-grained granite
(a) offers higher resistance to weathering
(b) can be easily polished and worked
(c) is used for exterior facing of buildings
(d) all of these✓
91) A limestone containing about 30% of alumina and silica is called
(a) granular limestone
(b) compact limestone
(c) magnesium limestone
(d) kankar✓
92) The compressive strength of sandstone is
(a) 40 MN/m2
(b) 55 MN/m2
(c) 65 MN/m2✓
(d) 80 MN/m2
93) The specific gravity of sandstone is
(a) 1.1 to 1.8
(b) 1.8 to 2.65
(c) 2.65 to 2.95✓
(d) 2.95 to 3.4
94) The quarrying of stone by the method of wedging is successfully carried out in
(a) sandstones
(b) limestones
(c) marbles
(d) all of these✓
95) The dressing of stone is done
(a) immediately after quarrying✓
(b) after seasoning
(c) after three months of quarrying
(d) just before building
96) The crushing strength of a stone depends upon its
(a) texture
(b) specific gravity
(c) workability
(d) both (a) and (b) ✓
97) For the construction of retaining walls, a
(a) soft
(b) hard
(c) heavy✓
98) For high degree of workability, the compaction factor is
(a) 0.65
(b) 0.65
(c) 0.85
(d) 0.95✓
99) Workability of concrete mix having very low water-cement ratio should e obtained by
(a) flexural strength test
(b) slump test
(c) compaction factor test✓
(d) Anyone tese
100) The slump test of concrete is used to mesure its
(a) consistency✓
(b) mobility
(c) homogeneity
(d) all of these
101) If the slump of concrete mix is 70 mm, its workability is considered to be
(a) very low
(b) low
(c) medium✓
(d) high
102) A compaction factor of 0.88 indictes that the workability of concrete mix is
(a) very low
(b) low
(c) medium✓
(d) high
103) More water should not be added in the concrete mix, as to increase
(a) strength
(b) durability
(c) water-cement ratio✓
(d) all of these
104) The main object of proportioning concrete is to obtain
(a) required strength and workability
(b) desired durability
(c) water tightness
(d) all of these✓
105) The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is
(a) 15 N/mm2
(b) 20 N/mm2
(c) 25 N/mm2✓
(d) 30 N/mm2
106) The ratio of different ingredients (cement, sand and aggregate) in concrete mix of grade M 20 is
(a) 1 : 1 : 2
(b) 1 : 1.5 : 3✓
(c) 1 : 2 : 4
(d) 1 : 3 : 6
107) In preliminary test, the concrete is placed in the mould in
(a) two
(b) three✓
(c) four
(d) five
108) The preliminary test should be repeated if the difference of compressive strength of three test specimens exeeds
(a) 0.5 N / mm2
(b) 1 N / mm2
(c) 1.5 N / mm2✓
(d) 2 N / mm2
109) The mass concrete in pier and abutments, the grade of concrete mix used, is
(a) 1 ; 1 : 2
(b) 1 ; 1.5 : 3
(c) 1 ; 2 : 4
(d) 1 ; 3 : 6✓
110) For highly loaded columns, the concrete mix used is of proportion
(a) 1 ; 1 : 2✓
(b) 1 ; 1.5 : 3
(c) 1 ; 2 : 4
(d) 1 ; 3 : 6
111) If the proportions of different ingredients (cement, sand and aggregate) are in the ratio of 1 : 2 : 4, then the grade of concrete is
(a) M 10
(b) M 15✓
(c) M 20
(d) M 25
112) If 30% excess water is added, the strength of concrete is reduced by
(a) 30%
(b) 40%
(c) 50%✓
(d) 60%
113) The number of bags of cement required per cubic metre of 1 ; 2 ; 4 concrete will be approximately
(a) 2 to 3
(b) 3 to 4
(c) 4 to 5
(d) 5 to 6✓
114) The measuring 50 litres of aggregate, the inner dimensions of a farma should be
(a) 25 cm x 25 cm x 40 cm
(b) 29 cm x 29 cm x 48 cm
(c) 30 cm x 30 cm x 50 cm
(d) 31 cm x 31 cm x 52 cm✓
115) The process of mixing, transporting, placing and compacting the cement concrete should not take more than
(a) 30 minutes✓
(b) 60 minutes
(c) 90 minutes
(d) 120 minutes
116) For concreting of tunnel lining, the concrete is transported by
(a) pumps✓
(b) pans
(c) wheel barrows
(d) containers
117) The concrete can be lifted by pumps through a maximum vertical distance of
(a) 10 m
(b) 20 m
(c) 30 m
(d) 50 m✓
118) The attrition test on stones is performed
(a) to determine the crushing strength of the stone
(b) for assessing the resistance of stone to the sun, rain, wind et(c)
(c) for ascertain the stability of the stone when exposed to acid fumes
(d) for determining the rate of wear of stone due to grinding action under traffic✓
119) A first class brick should not absorb water more than
(a)10%
(b) 15%
(c) 20% ✓
(d) 25%
120) A first class brick should have a minimum crushing strength of
(a) 7 MN/m2
(b) 10.5 MN/m2✓
(c) 12.5 MN/m2
(d) 14 MN/m2
121) The percentage of alumina in a good brick clay should vary from
(a) 20 to 30%✓
(b) 30 to 40%
(c) 40 to 50%
(d) 50 to 60%
122) The percentage of silica in a good brick clay should vary from
(a) 20 to 30%
(b) 30 to 40%
(c) 40 to 50%
(d) 50 to 60%✓
123) Excess o silica in the clay
(a) makes the brick brittle and weak✓
(b) makes the brick crack and wrap on drying
(c) changes the colour of the brck from red to yellow
(d) improves impermeability and durability of the brick
124) Efflorescence is caused if
(a) the alkaline salt is present in the bricks
(b) the clay used for making bricks contain pyrite
(c) the water used for pugging the clay contains gypsum
(d) all of the above✓
125) The good clay for making bricks is
(a) un weathered clay
(b) weathered clay✓
(c) silted soil
(d) black cotton soil
126) The bricks after moulding should be dried in
(a) open air
(b) sun for 3 to 8 days
(c) air for 3 to 8 days but not in sun✓
(d) hot air for 3 days
127) The frog of a brick is normally made on its
(a) longer face
(b) shorter face
(c) bottom face
(d) top face✓
127-a)The average out-turn of first class bricks in clamp burning is about
(a) 50%
(b) 60%✓
(c) 70%
(d) 80%
128) The average out-turn of first class bricks in kiln burning is
(a) 50 to 60%
(b) 60 to 70%
(c) 70 to 80%
(d) 80 to 90%✓
129) The burning of bricks in kilns is complete within
(a) 12
(b) 24✓
(c) 48
(d) 96
130) The bricks should be burnt at temperature from
(a) 300’C to 500’C
(b) 500’C to 700’C
(c) 700’C to 1000’C
(d) 1000’C to 1200’C✓
131) well burnt having smooth and even surface
(b) slightly over burnt having rough surface
(c) under burnt and can be easily broken
(d) over burnt with irregular shape✓
132) The compressive strength of perforated bricks should not be less than
(a) 4 MN/m2
(b) 5 MN/m2
(c) 6 MN/m2
(d) 7 MN/m2✓
133) The compressive strength of paving bricks should not be less than
(a) 20 MN/m2
(b) 30 MN/m2
(c) 40 MN/m2 ✓
(d) 50 MN/m2
134) For one cubic metre of brick masonry, the number of bricks required are
(a) 400
(b) 450
(c) 500 ✓
(d) 550
135) The dolomite bricks are
(a) ordinary bricks
(b) acid refractory bricks
(c) basic refractory bricks✓
(d) neutral refractory bricks
136) Quick lime is a
(a) carbonate of lime
(b) oxide of calcium
(c) product left immediately after the calcination of pure limestone✓
(d) lime quicklytreated with water
137) The fuel generally used for burning limestone is
(a) coal
(b) charcoal
(c) firewood
(d) any one of these✓
138) The commonly used lime in white washing is
(a) quick lime
(b) fat lime✓
(c) lean lime
(d) ydraulic lime
139) The lime mortar is made from
(a) quick lime
(b) fat lime
(c) lean lime
(d) hydraulic lime✓
140) Quick lime on reaction with water gives
(a) hydraulic lime
(b) slaked lime✓
(c) hydrated lime
(d) poorlime
141) The main constituent of a Portland cement is
(a) lime✓
(b) alumina
(c) iron oxide
(d) alkalies
142) The silica in Portland cement should be
(a) 10 to 20%
(b) 20 to 25%✓
(c) 25 to 40%
(d) 40 to 60%
143) The clinker is formed at a temperature of
(a) 500°C
(b) 1000°C
(c) 1200°C
(d) 1500°C✓
144) The amount of gypsum, usually, added in the manufacture of cement is
(a) 0.1 to 0.5%
(b) 0.5 to 1%
(c) 1 to 3%✓
(d) 3 to 5%
145) The cementing property in cement is mainly due to
(a) lime✓
(b) silica
(c) iron oxide
(d) alumina
146) The setting and hardening of cement paste is mainly due to the hydration and hydrolysis of
(a) tri-calcium silicate
(b) di-calcium silicate
(c) tri-calcium aluminate
(d) all of these✓
147) The compound responsible for the initial setting of cement, is
(a) tri-calcium aluminate
(b) tetra-calcium alumino ferrite
(c) both (a) and (b) ✓
(d) none of these
148) The ultimate strength of cement is provided by
(a) silica
(b) di-calcium silicate✓
(c) tri-calcium silicate
(d) tri-calcium aluminate
149) A good quality cement should have higher percentage of
(a) silica
(b) free lime
(c) di-calcium silicate
(d) tri-calcium silicate✓
150) The rapid hardening Portland cement has a
(a) lower heat of hydration
(b) higher heat of hydration
(c) lower shrinkage coefficient✓
151) The initial setting of cement is caused due to
(a) di-calcium silicate
(b) tri-calcium silicate
(c) tri-calcium aluminate✓
(d) tri-calcium alumino ferrite
152-a) The hapd hardening Portland cement is obtained by
(a) grinding the clinker to a high degree of fineness✓
(b) adding calcium sulphate to the mixture
(c) adding gypsum after grinding
(d) burning the mixture at a lower temperature
152-b) The fineness of cement is tested by
(a) air-permeability method✓
(b) Le-chatelier method
(c) Vicat's apparatus
(d) all of these
153) Vicat's apparatus is used to determine the
(a) initial setting time of cement
(b) final setting time of cement
(c) normal consistency of cement
(d) all of these✓
154) The expansion of cement should not exceed
(a) 5 mm
(b) 10 mm✓
(c) 15 mm
(d) 20 mm
155) The normal consistency of Portland cement is about
(a) 10%
(b) 15%
(c) 20%
(d) 25%✓
156-a) The initial setting time of rapid hardening cement should not be less than
(a) 30 min ✓
(b) 1 hours
(c) 4 hours
(d) 8 hours
156) The final setting time of ordinary cement should not be more than
(a) 2 hours
(b) 4 hours
(c) 8 hours
(d) 10 hours✓
157) The addition of pozzolana to Portland cement causes
(a) less heat of hydration
(b) increase in shrinkage
(c) decrease in permeability
(d) all of these✓
158) The rate of hydration and hydrolysis of cement depends upon its
(a) soundness
(b) fineness ✓
(c) setting time
(d) tensile strength
159) The percentage of the residue left after sieving good Portland cement in 90 micron sieve should not exceed
(a) 5%
(b) 10%✓
(c) 20%
(d) 30%
160) The expansion in Portland cement can be tested by
(a) fineness test
(b) soundness test✓
(c) setting time test
(d) normal consistency test
161) The specific surface (in cm2/g) of a good Portland cement should not be less than
(a) 500
(b) 100
(c) 2250✓
(d) 3200
162) The expansion of Portland cement is caused by
(a) free lime
(b) magnesia
(c) silica
(d) both (a) and (c) ✓
163) The compressive strength of a good Portland cement and standard sand mortar after 3 days of curing should not be less than
(a) 7 MN/m2
(b) 11.5 MN/m2✓
(c) 17.5 MN/m2
(d) 21 MN/m2
164) The sand is mixed with lime mortar to
(a) reduce cost
(b) reduce setting time
(c) improve strength
(d) prevent shrinkage and cracking✓
165) For R.(c)(c) construction, the maximum size of coarse aggregate is limited to
(a) 10 mm
(b) 15 mm
(c) 20 mm
(d) 25 mm✓
166) The workability of cement concrete can be improved by
(a) increasing the quantity of cement✓
(b) increasing the proportion of coarse aggregate
(c) increasing the quantity of sand
(d) all of the above
167) The durability of concrete is proportional to
(a) sand content
(b) water-cement ratio
(c) cement-aggregate ratio✓
(d) aggregate-water ratio
168) The maximum water-cement ratio for durable concrete is
(a) 0.2
(b) 0.4
(c) 0.6
(d) 0.8✓
169) The durability of cement concrete is usually improved by
(a) increasing the quantity of coarse sand
(b) increasing the quantity of cement✓
(c) decreasing the water-cement ratio
(d) decreasing the proportion of fine aggregate
170) The strength of cement concrete increases with
(a) increase in the size of aggregate
(b) increase in the temperature of water of curing
(c) increase in the size of aggreregate
(d) all of the above✓
171) The shrinkage of ordinary concrete is about
(a) 0.1 to 0.3 mm/m
(b) 0.3 to 0.6 mm/m✓
(c) 0.6 to 1.2 mm/m
(d) 1.2 to 2.1 mm/m
172) The slump test of concrete is used to measure its
(a) consistency✓
(b) tensile and compressive strength
(c) impact value
(d) homogeneity
173) The time required for air seasoning of soft wood is
(a) 15 to 30 days
(b) 30 to 60 days
(c) 60 to 90 days✓
(d) 90 to 120 days
174) The time required for seasoning of timber in kilm seasoning is
(a) 2 to 5 days
(b) 5 to 10 days
(c) 10 to 20 days✓
(d) 20 to 40 days
175) The timber whose thickness is less than 5 cm and the width exceeds 12 cm, is called a
(a) board✓
(b) plank
(c) batten
(d) log
176) The thickness of five-ply sheet varies from
(a) 3 to 6 mm
(b) 6 to 9 mm✓
(c) 9 to 16 mm
(d) 16 to 20 mm
177) The thickness of lamin boards vary from
(a) 5 to 12 mm
(b) 12 to 15 mm
(c) 12 to 25 mm✓
(d) 25 to 30 mm
178) The wood generally used for railway sleepers is
(a) mango
(b) kail✓
(c) babul
(d) deodar
179) The pigment in paints is mixed to give desired
(a) smoothness
(b) colour✓
(c) appearance
(d) durability
180) The liquid part of the paint is called
(a) pigment
(b) vehicle✓
(c) solvent
(d) drier
181) The liquid medium used in enamel paints is
(a) thinner
(b) alcohol
(c) turpentine
(d) varnish✓
182) The commonly base used in a paint is
(a) iron oxide
(b) zinc oxide
(c) titanium white
(d) any one of these✓
183) The thinner used for oil paints is
(a) water
(b) turpentine✓
(c) carbon tetrachloride
(d) any one of these
184) The commonly used extender in a paint is
(a) barium sulphate
(b) gypsum
(c) alcohol
(d) any one of these✓
185) The drier in an oil paint should not be more than
(a) 5%
(b) 10%✓
(c) 15%
(d) 20%
The best primer used for structural steel work is
(a) white lead
(b) red lead✓
(c) zinc oxide
(d) iron oxide
186) The vehicle used in bronze paints is usually
(a) linseed oil
(b) naptha
(c) water
(d) nitro-cellulose lacquer✓
187) The base material for distemper is
(a) chalk✓
(b) lime
(c) clay
(d) lime putty
188) Distemper is used on
(a) brick walls
(b) concrete surfaces
(c) plastered surfaces exposed to weather
(d) plastered surfaces not exposed to weathe✓
189) Sprit varnish consists of
(a) spirit and wax
(b) spirit and shellac✓
(c) turpentine, spirit and wax
(d) turpentine, spirit and shellac
190) Which of the following paint is highly resistant to fire?
(a) Cement paint
(b) Asbestos paint✓
(c) Aluminium paint
(d) enamel paint
