Quiznetik
Building Materials | Set 7
1. Gypsum is added in the manufacture of Portland cement
A. while mixing the raw materials
B. during burning in the rotary kiln
C. at the beginning of grinding the clinker
D. at the end of grinding the clinker into powder
Correct : D. at the end of grinding the clinker into powder
2. The constituent in lime which retard the slaking action and increase the rapidity of setting, is
A. silica
B. sulphate
C. alkalies
D. alumina
Correct : A. silica
3. 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
Correct : D. 25 mm
4. Which of the following statement is correct?
A. The fat lime swells two to three times of its original volume during slaking.
B. The poor lime is of pure white colour.
C. The feebly hydraulic lime slakes sluggishly.
D. all of the above
Correct : A. The fat lime swells two to three times of its original volume during slaking.
5. The dolomite bricks are
A. ordinary bricks
B. acid refractory bricks
C. basic refractory bricks
D. neutral refractory bricks
Correct : C. basic refractory bricks
6. According to Indian standard specifications, the full strength of concrete is achieved after
A. 7 days
B. 14 days
C. 21 days
D. 28 days
Correct : D. 28 days
7. Igeous rock has
A. crystalline, glossy or fused texture
B. foliated structure which is hard and durable
C. layers of different composition, colour and structure
D. none of the above
Correct : A. crystalline, glossy or fused texture
8. Poor or lean lime
A. slakes rapidly with considerable evolution of heat
B. takes very long time to develop adequate strength
C. has high plasticity
D. none of the above
Correct : D. none of the above
9. 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
Correct : A. increasing the quantity of cement
10. The liquid medium used in oil paints is
A. thinner
B. alcohol
C. linseed oil
D. turpentine
Correct : C. linseed oil
11. The good clay for making bricks is
A. unweathered clay
B. weathered clay
C. silted soil
D. black cotton soil
Correct : B. weathered clay
12. The strength of timber is maximum in the direction
A. parallel
B. perpendicular
Correct : A. parallel
13. The liquid medium used in enamel paints is
A. thinner
B. alcohol
C. turpentine
D. varnish
Correct : D. varnish
14. Granite is an example of
A. aqueous rocks
B. sedimentary rocks
C. metamorphic rocks
D. igneous rocks
Correct : D. igneous rocks
15. The sand is mixed with lime mortar to
A. reduce cost
B. reduce setting time
C. improve strength
D. prevent shrinkage and cracking
Correct : D. prevent shrinkage and cracking
16. Bituminous paint consists of bitumen dissolved in
A. spirit
B. naptha
C. linseed oil
D. either (a) or (b)
Correct : D. either (a) or (b)
17. The colour of brick depends upon the amount of iron oxide present in the clay.
A. Correct
B. Incorrect
Correct : A. Correct
18. 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
Correct : D. 1000?C to 1200?C
19. The principal constituent of every kind of brick earth is alumina.
A. True
B. False
Correct : A. True
20. 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
Correct : C. 12 to 25 mm
21. The purpose of seasoning of timber is to
A. change the direction of grains
B. remove voids
C. reduce moisture content
D. all of these
Correct : C. reduce moisture content
22. Rich or fat lime
A. slakes rapidly with considerable evolution of heat
B. takes very long time to develop adequate strength
C. has high plasticity
D. all of these
Correct : D. all of these
23. Le-chatelier method is used to determine
A. initial setting of cement
B. fineness of cement
C. soundness of cement
D. normal consistency of cement
Correct : C. soundness of cement
24. The fuel generally used for burning limestone is
A. coal
B. charcoal
C. firewood
D. any one of these
Correct : D. any one of these
25. 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
Correct : C. 2.65 to 2.95
26. The commonly used cement in cement paints is
A. white cement
B. Portland cement
C. alumina cement
D. rapid hardening cement
Correct : A. white cement
27. The most powerful explosive used in blasting is
A. blasting power
B. dynamite
C. gun cotton
D. cordite
Correct : C. gun cotton
28. The quarrying of stone by the method of wedging is successfully carried out in
A. sandstones
B. limestones
C. marbles
D. all of these
Correct : D. all of these
29. The indentation marks left on bricks during the process of moulding, are known as
A. fillets
B. frogs
C. projections
D. marks
Correct : B. frogs
30. 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
Correct : D. all of the above
31. The moisture content in timber for framework should not exceed
A. 5%
B. 10%
C. 15%
D. 20%
Correct : C. 15%
32. The strength of white cement is
A. equal to
B. less than
C. greater than
Correct : B. less than
33. The thinner used for oil paints is
A. water
B. turpentine
C. carbon tetrachloride
D. any one of these
Correct : B. turpentine
34. The bitumen paints are used for providing
A. rough
B. smooth
C. protective
Correct : C. protective
35. The slump test of concrete is used to measure its
A. consistency
B. tensile and compressive strength
C. impact value
D. homogeneity
Correct : A. consistency
36. The bulking of sand
A. increases
B. decreases
Correct : A. increases
37. 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%
Correct : D. 50 to 60%
38. The sedimentary rocks are formed due to
A. solidification of molten mass lying below or above the earth surface
B. gradual deposition of materials like sand, clay, etc., generally by setting water
C. alteration of original structure under heat and excessive pressure
D. none of the above
Correct : B. gradual deposition of materials like sand, clay, etc., generally by setting water
39. In order to dry the quarry sap of a freshly quarried slone, it should be exposed to open air for a period of
A. one month
B. four months
C. six to twelve months
D. two years
Correct : C. six to twelve months
40. The metallic oxide used in the form of powder in a paint is called
A. extender
B. base
C. vehicle
D. drier
Correct : B. base
41. A first class brick should not absorb water more than
A. 10%
B. 15%
C. 20%
D. 25%
Correct : C. 20%
42. The colour of granite is
A. grey
B. green
C. brown
D. all of these
Correct : D. all of these
43. The stone used for the construction of curved or ornamental work should be soft.
A. Right
B. Wrong
Correct : A. Right
44. Moorum is a decomposed laterite and has deep brown or red colour.
A. Yes
B. No
Correct : A. Yes
45. The rocks formed due to alteration of original structure under heat and excessive pressure are called metamorphic rocks.
A. Agree
B. Disagree
Correct : A. Agree
46. The silica in Portland cement should be
A. 10 to 20%
B. 20 to 25%
C. 25 to 40%
D. 40 to 60%
Correct : B. 20 to 25%
47. Excess pf alumina in the clay
A. makes the brick brittle and weak
B. makes the brick crack and warp on drying
C. changes colour of the brick from red to yellow
D. improves impermeability and durability of the brick
Correct : B. makes the brick crack and warp on drying
48. The final setting time of ordinary cement should not be more than
A. 2 hours
B. 4 hours
C. 8 hours
D. 10 hours
Correct : D. 10 hours
49. The brick earth is derived by the disintegration of
A. igneous
B. metamorphic
Correct : A. igneous
50. The central part of a tree is called
A. heart wood
B. pith
C. sap wood
D. cambium layer
Correct : B. pith
51. Which of the following is an example of silicious rock?
A. Granite
B. Gneiss
C. Quartzite
D. all of these
Correct : D. all of these
52. During the process of burning limestone, clay forms certain compound which
A. gives hydraulic lime
B. gives power of quick setting
C. does not allow to be dissolved in the outside water when used in damp situations
D. all of the above
Correct : D. all of the above
53. The clinker is formed at a temperature of
A. 500?C
B. 1000?C
C. 1200?C
D. 1500?C
Correct : D. 1500?C
54. The ultimate strength of cement is provided by
A. silica
B. di-calcium silicate
C. tri-calcium silicate
D. tri-calcium aluminate
Correct : B. di-calcium silicate
55. The slaking of moderately hydraulic lime is scarcely noticeable.
A. Yes
B. No
Correct : B. No
56. The durability of concrete is proportional to
A. sand content
B. water-cement ratio
C. cement-aggregate ratio
D. aggregate-water ratio
Correct : C. cement-aggregate ratio
57. The rate of hydration and hydrolysis of cement depends upon its
A. soundness
B. fineness
C. setting time
D. tensile strength
Correct : B. fineness
58. The expansion of cement should not exceed
A. 5 mm
B. 10 mm
C. 15 mm
D. 20 mm
Correct : B. 10 mm
59. Distemper is used on
A. brick walls
B. concrete surfaces
C. plastered surfaces exposed to weather
D. plastered surfaces not exposed to weather
Correct : D. plastered surfaces not exposed to weather
60. Slate in the form of tiles is used
A. for paving
B. as road metal
C. as an excellent roof covering material
D. for the manufacture of cement
Correct : C. as an excellent roof covering material
61. A good Portland cement when tested for fineness, the percentage of residue left after sieving in 90 micron IS sieve should not exceed 10 percent.
A. True
B. False
Correct : A. True
62. Lime is used
A. as a matrix for concrete
B. for plastering walls, ceilings etc.
C. for improving soil for agricultural purposes
D. all of the above
Correct : D. all of the above
63. For the construction of retaining walls, a
A. soft
B. hard
C. heavy
Correct : C. heavy
64. Quick lime is a
A. carbonate of lime
B. oxide of calcium
C. product left immediately after the calcination of pure limestone
D. lime quickly treated with water
Correct : C. product left immediately after the calcination of pure limestone
65. Enamel paint is made by adding
A. white lead in varnish
B. bitumen in varnish
C. white lead in lacquer
D. zinc white in spirit
Correct : A. white lead in varnish
66. Jhama bricks are
A. 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
Correct : D. over burnt with irregular shape
67. The pigment in paints is mixed to give desired
A. smoothness
B. colour
C. appearance
D. durability
Correct : B. colour
68. Granite is mainly composed of
A. quartz and mica
B. felspar and mica
C. quartz and felspar
D. quartz, felspar and mica
Correct : D. quartz, felspar and mica
69. The coefficient of linear expansion of concrete is almost the same as that of steel.
A. Correct
B. Incorrect
Correct : A. Correct
70. For one cubic metre of brick masonry, the number of bricks required are
A. 400
B. 450
C. 500
D. 550
Correct : D. 550
71. The defect caused by imperfect seasoning, is called
A. wet rot
B. dry rot
C. honeycombing
D. cup shake
Correct : C. honeycombing
72. A good quality cement should have higher percentage of
A. silica
B. free lime
C. di-calcium silicate
D. tri-calcium silicate
Correct : D. tri-calcium silicate
73. 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
Correct : D. 7 MN/m2
74. 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%
Correct : D. 80 to 90%
75. Gneiss is chemically classified as
A. calcareous rock
B. argillaceous rock
C. silicious rock
D. none of these
Correct : C. silicious rock
76. The chief ingredient of a paint is
A. alcohol
B. drier
C. oil
D. pigment
Correct : D. pigment
77. 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
Correct : D. all of these
78. The process of adding the required quantity of water to quick lime in order to convert it into hydrated lime, is known as
A. calcination
B. hydration
C. slaking
D. quenching
Correct : C. slaking
79. The fineness of cement is tested by
A. air-permeability method
B. Le-chatelier method
C. Vicat's apparatus
D. all of these
Correct : A. air-permeability method
80. The standard size of a masonry brick is 20 cm x 10 cm x 10 cm
A. Agree
B. Disagree
Correct : B. Disagree
81. Which of the following statement is correct?
A. The sand used for making mortar should be fine.
B. The rounded grains of sand produce a strong mortar.
C. The mortar made with coarse sand is stronger than the one made with fine stand.
D. all of the above
Correct : C. The mortar made with coarse sand is stronger than the one made with fine stand.
82. When quarrying is to be done in hard stone and compact rocks, the usual method of quarrying is
A. by wedging
B. by channelling machine
C. by blasting
D. all of these
Correct : C. by blasting
83. The soundness of cement is tested by
A. air permeability method
B. Le-chatelier method
C. Vicat's apparatus
D. all of these
Correct : B. Le-chatelier method
84. The wood generally used for railway sleepers is
A. mango
B. kail
C. babul
D. deodar
Correct : B. kail
85. Which of the following statement is correct?
A. Stains used as paints have synthetic pigments.
B. Stucco paints contain polyvinyl acetate.
C. The solvent used in distempers is turpentine.
D. all of the above
Correct : B. Stucco paints contain polyvinyl acetate.
86. Gun cotton is made by saturating cotton with nitric acid.
A. Agree
B. Disagree
Correct : A. Agree
87. The maximum water-cement ratio for durable concrete is
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Correct : D. 0.8
88. According to Indian standard specifications, the concrete should be cured under a humidity of
A. 30%
B. 50%
C. 70%
D. 90%
Correct : D. 90%
89. 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
Correct : B. increasing the quantity of cement
90. The specific gravity of stone should not, in any case be less than
A. 1
B. 1.5
C. 2
D. 2.5
Correct : D. 2.5
91. The burning of bricks in kilns is complete within
A. 12
B. 24
C. 48
D. 96
Correct : B. 24
92. 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
Correct : D. all of these
93. Excess of 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 brick from red to yellow
D. improves impermeability and durability of the brick
Correct : A. makes the brick brittle and weak
94. For railway ballast, the stone should be
A. soft with a uniform texture
B. hard, heavy, strong and durable
C. hard, tough, resistant to abrasion and durable
D. hard, dense, durable, tough and easily workable
Correct : D. hard, dense, durable, tough and easily workable
95. The crushing strength of a stone depends upon its
A. texture
B. specific gravity
C. workability
D. both (a) and (b)
Correct : D. both (a) and (b)
96. The strength of cement concrete is directly proportional to cement-water ratio.
A. Agree
B. Disagree
Correct : A. Agree
97. Lime occurs in a free state in nature.
A. True
B. False
Correct : B. False
98. The best primer used for structural steel work is
A. white lead
B. red lead
C. zinc oxide
D. iron oxide
Correct : B. red lead
99. The size of mould for bricks should be
A. equal to
B. smaller than
C. larger than
Correct : C. larger than
100. The paint which has high reflective property is
A. cellulose paint
B. casein paint
C. bronze paint
D. enamel paint
Correct : C. bronze paint