Building Materials MCQ Questions & Answers
1. Which of the following has more fire resisting characteristics?
(A) Marble
(B) Lime stone
(C) Compact sand stone
(D) Granite
2. The rocks which are formed due to cooling of magma at a considerable depth from earth’s surface are called
(A) Plutonic rocks
(B) Hypabyssal rocks
(C) Volcanic rocks
(D) Igneous rocks
3. Plywood has the advantage of
(A) Greater tensile strength in longer direction
(B) Greater tensile strength in shorter direction
(C) Same tensile strength in all directions
(D) None of the above
4. Due to attack of dry rot, the timber
(A) Cracks
(B) Shrinks
(C) Reduces to powder
(D) None of these
5. Excess of alumina in brick earth makes the brick
(A) Impermeable
(B) Brittle and weak
(C) To lose cohesion
(D) To crack and warp on drying
6. Pick up the correct statement from the following
(A) In stone arches, the stones are placed with their natural beds radial
(B) In cornices, the stones are placed with their natural beds as vertical
(C) In stone walls, the stones are placed with their natural beds as horizontal
(D) All the above
7. The constituent of cement which is responsible for all the undesirable properties of cement is
(A) Di-calcium silicate
(B) Tri-calcium silicate
(C) Tri-calcium aluminate
(D) Tetra calcium alumino ferrite
8. Inner part of a timber log surrounding the pitch, is called
(A) Sapwood
(B) Cambium layer
(C) Heart wood
(D) None to these
9. For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
(A) 1 : 2
(B) 1 : 3
(C) 1 : 4
(D) 1 : 6
10. 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
11. The basic purpose of a retarder in concrete is
(A) To increase the initial setting time of cement paste in concrete
(B) To decrease the initial setting time of cement paste in concrete
(C) To render the concrete more water tight
(D) To improve the workability of concrete mix
12. Clay and silt content in a good brick earth must be at least
(A) 50 %
(B) 40 %
(C) 30 %
(D) 25 %
13. Which of the following is the purest form of iron?
(A) Cast iron
(B) Wrought iron
(C) Mild steel
(D) High carbon steel
14. If the iron ore contains clay as an impurity, the flux added during calcination, is
(A) Clay
(B) Lime stone
(C) Argillaceous iron ore
(D) All the above
15. The stretcher bond in brick masonry can be used only when the thickness of wall is
(A) 90 mm
(B) 180 mm
(C) 190 mm
(D) 280 mm
16. The plywood
(A) Has good strength along the panel only
(B) Can be spilt in the plane of the panel
(C) Has greater impact resistance to blows than ordinary wood
(D) Cannot be bent more easily than ordinary wood of same thickness
17. 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) All the above
18. Advantage of a clamp compared to a kiln for burning bricks is that
(A) It takes less time for burning
(B) It gives more output of first class bricks
(C) It has less initial cost
(D) It is suitable when bricks are required in large numbers
19. Pick up the correct statement from the following
(A) Solder material is an alloy which melts at a temperature above 400°C
(B) Brazing is done at temperature above 600°C to 1100°C
(C) Brazing joint is stronger than the solder joint
(D) All the above
20. Assertion A : Pure lime takes a long time to develop adequate strength.
Reason R : Pure lime has slow hardening characteristics.
Select your answer according to the coding system given below:
(A) Both A and R is true and R is correct explanation of A
(B) Both A and R is true and R is not a correct explanation of A
(C) A is true but R is false
(D) A is false but R is true
21. 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) All the above
22. Early attainment of strength in rapid hardening cement is mainly due to
(A) Gypsum
(B) Finer grinding
(C) Tri-calcium silicate
(D) Tri-calcium aluminate
23. 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
24. Which of the following cements contains maximum percentage of dicalcium silicate?
(A) Ordinary Portland cement
(B) Low heat cement
(C) Rapid hardening cement
(D) Sulphate resisting cement
25. Pick up the incorrect statement from the following
(A) Hydraulic lime is generally obtained by burning kankar
(B) Hydraulic lime sets slowly as compared to fat lime
(C) Hydraulic lime is generally used in lime mortar
(D) None of these
26. Which of the following stresses is used for identifying the quality of structural steel?
(A) Ultimate stress
(B) Yield stress
(C) Proof stress
(D) None of the above
27. Quick lime
(A) Generates heat when added to water
(B) Reacts with carbon dioxide
(C) May be used for white-washing
(D) All the above
28. Assertion A : Normally turpentine oil is recommended as thinner for indoor painting.
Reason R : Turpentine oil is costlier than other thinners.
Select your answer according to the coding system given below:
(A) Both A and R is true and R is the correct explanation of A
(B) Both A and R is true but R is not the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true
29. 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
30. A mortar joint in masonry which is normal to the face of wall is known as
(A) Bed joint
(B) Wall joint
(C) Cross joint
(D) Bonded joint
31. A volatile substance added to a paint to make its application easy and smooth, is known as
(A) Base
(B) Solvent
(C) Vehicle
(D) None to these
32. Jumper is a tool used for
(A) Testing of stones
(B) Quarrying of stones
(C) Dressing of stones
(D) None of the above
33. Pick up the volcanic rock from the following
(A) Granite
(B) Dolerite
(C) Basalt
(D) All the above
34. Sapwood consists of
(A) Innermost annular rings around the pith
(B) Portion of timber between heartwood and cambium layer
(C) Thin layers below the bark
(D) Thin fibre which extends from the pith outwards and holds the annular rings together
35. Strength of cement concrete primarily depends upon
(A) Quality of water
(B) Quantity of aggregate
(C) Quantity of cement
(D) Water-cement ratio
36. The main function of alumina in brick earth is
(A) To impart plasticity
(B) To make the brick durable
(C) To prevent shrinkage
(D) To make the brick impermeable
37. 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) All the above
38. Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?
(A) Lime stone and alumina
(B) Silica and alkalies
(C) Alumina and iron
(D) Alkalies and magnesium
39. 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
40. Hydraulic lime is obtained by
(A) Burning of lime stone
(B) Burning of kankar
(C) Adding water to quick lime
(D) Calcination of pure clay
41. 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
42. For testing compressive strength of cement, the size of cube used is
(A) 50 mm
(B) 70.6 mm
(C) 100 mm
(D) 150 mm
43. When a brick is immersed in water for 24 hours and then dried, if
(A) No grey or white deposits appear on the surface, the brick is free from soluble salts
(B) 10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
(C) 50 percent surface is covered with grey or white deposits, the brick has serious efflorescence
(D) All the above
44. Gypsum consists of
(A) H2S and CO2
(B) CaSO4 and H2O
(C) Lime and H2O
(D) CO2 and calcium
45. 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
46. The most commonly used retarder in cement is
(A) Gypsum
(B) Calcium chloride
(C) Calcium carbonate
(D) None of the above
47. The rocks which are formed due to cooling of magma at a relatively shallow depth from the earth’s surface are called
(A) Plutonic rocks
(B) Hypabyssal rocks
(C) Volcanic rocks
(D) Igneous rocks
48. The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is
(A) Less than 1
(B) Equal to 1
(C) Greater than 1
(D) Less than 1 in beams but greater than 1 in channels
49. Non acid-resistant asbestos is
(A) Tremolite asbestos
(B) Chrysotile asbestos
(C) Amosite asbestos
(D) None of these
50. The pressure acting on the stones in stone masonry construction should be
(A) Along the direction of bedding planes
(B) At 45° to the direction of bedding planes
(C) At 60° to the direction of bedding planes
(D) Perpendicular to the direction of bedding planes
51. 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) Iron-oxide
(D) Magnesia
52. The type of bond provided in brick masonry for carrying heavy loads is
(A) Single Flemish bond
(B) Double Flemish bond
(C) English bond
(D) Zigzag bond
53. Blister steel ……
(A) Is obtained by cementation process
(B) Is full of fissures and cavities
(C) Can be easily welded
(D) All the above
54. Gypsum is a ……
(A) Mechanically formed sedimentary rock
(B) Igneous rock
(C) Chemically precipitated sedimentary rock
(D) Metamorphic rock
55. Seasoning of timber is done
(A) To make it water proof
(B) To paint its surface
(C) To increase its temperature
(D) To remove water
56. Which of the following is a rock?
(A) Quartz
(B) Mica
(C) Gypsum
(D) None of the above
57. The tendency of a stone is, to split along
(A) Texture
(B) Fracture
(C) Cleavage
(D) Structure
58. Which of the following stone is best suited for construction of piers and abutments of a railway bridge?
(A) Granite
(B) Sand stone
(C) Lime stone
(D) Quartzite
59. Cast iron contains carbon approximately
(A) 1.5% to 5.5%
(B) 0.05% to 1.75%
(C) 0.250 %
(D) None to these
60. Which of the following trees yields hard wood?
(A) Deodar
(B) Chir
(C) Shishum
(D) Pine
61. Soundness of cement is tested by
(A) Vicat’s apparatus
(B) Le-chatelier apparatus
(C) Compressive strength testing apparatus
(D) None of these
62. First class timber has an average life of
(A) Less than one year
(B) 1 to 5 years
(C) 5 to 10 years
(D) More than 10 years
63. Bitumen may be dissolved in
(A) Carbondioxide
(B) Water
(C) Sodium chloride
(D) Carbon disulphide
64. Which of the following ingredients of the brick earth enables the brick to retain its shape?
(A) Alumina
(B) Silica
(C) Iron
(D) Magnesia
65. Veneering means…..
(A) Carving out designs on timber planks
(B) Chemically treating timber planks
(C) Thick layer of superior wood glued to inferior wood
(D) Thin layer of superior wood glued to inferior wood
66. Number of bricks required for one cubic metre of brick masonry is
(A) 400
(B) 450
(C) 500
(D) 550
67. Which one of the following is used for preparing porcelain?
(A) Clay
(B) Feldspar
(C) Quartz
(D) All of these
68. The main ingredients of Portland cement are
(A) Lime and silica
(B) Lime and alumina
(C) Silica and alumina
(D) Lime and iron
69. 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
70. After storage, the strength of cement
(A) Decreases
(B) Increases
(C) Remains same
(D) May increase or decrease
71. A bull nose brick is not used for
(A) Rounding off sharp corners
(B) Pillars
(C) Decoration purpose
(D) Arches
72. The most common admixture which is used to accelerate the initial set of concrete is
(A) Gypsum
(B) Calcium chloride
(C) Calcium carbonate
(D) None of the above
73. Chlorite, a green colour mineral is mainly derived from the decomposition of
(A) Augite
(B) Biotite
(C) Hornblende
(D) All of these
74. The ultimate tensile strength of structural mild steel is about
(A) 160 N/mm²
(B) 260 N/mm²
(C) 420 N/mm²
(D) 520 N/mm²
75. 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
76. A queen closer is a
(A) Brick laid with its length parallel to the face or direction of wall
(B) Brick laid with its breadth parallel to the face or direction of wall
(C) Brick having the same length and depth as the other bricks but half the breadth
(D) Brick with half the width at one end and full width at the other
77. 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
78. The proportions of lime and sand in the mortar normally used in brick construction are
(A) 1 : 2
(B) 1 : 4
(C) 1 : 6
(D) 1 : 8
79. Index number expressing the relative sizes of both coarse and fine aggregates, is called
(A) Proportioning of aggregates
(B) Fineness modulus
(C) Grading of aggregates
(D) None of these
80. Which of the following sedimentary rocks changes into quartzite by metamorphic action?
(A) Sand stone
(B) Lime stone
(C) Shale
(D) Gypsum
81. 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) All of above
82. The stone suitable for rubble masonry should be
(A) Hard
(B) Tough
(C) Heavy
(D) Light
83. Pick up the correct statement from the following
(A) Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer
(B) Cupola furnace is used for the manufacture of cast iron
(C) Red short iron is of no value for welding purpose
(D) All the above
84. Spalling hammer is used for
(A) Driving wooden headed chisels
(B) Rough dressing of stones
(C) Carving of stones
(D) Breaking small projection of stones
85. Bullet proof glass is made of thick glass sheet sandwiched by a layer of
(A) Steel
(B) Stainless steel
(C) High test plastic
(D) Chromium plate
86. Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is
(A) 0°
(B) 30°
(C) 45°
(D) 90°
87. According to IS 399-1963, the weight of the timber is specified at
(A) 8% moisture content
(B) 10% moisture content
(C) 12% moisture content
(D) 14% moisture content
88. The internal size of mould used in brick preparation is
(A) Equal to the size of a fully burnt brick
(B) Smaller than the size of a fully burnt brick
(C) Greater than the size of a fully burnt brick
(D) None of the above
89. Pick up the correct statement from the following
(A) The free quartz suddenly expands at a temperature lower than 600°C
(B) The lime stone resists fire upto about 800°C and at higher temperature it splits into CaO and CO2
(C) The sand stone with silicates resist a fire in a better way
(D) All the above
90. Quick lime is……
(A) Calcium carbonate
(B) Calcium oxide
(C) Calcium hydroxide
(D) None of the above
91. 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) All the above
92. The initial setting time for ordinary Portland cement as per IS specifications should not be less than
(A) 10 minutes
(B) 30 minutes
(C) 60 minutes
(D) 600 minutes
93. Rapid hardening cement attains early strength due to
(A) Larger proportion of lime grounded finer than normal cement
(B) Lesser proportion of lime grounded coarser than normal cement
(C) Lesser proportion of lime grounded finer than normal cement
(D) Excess percentage of gypsum
94. With increase in moisture content, the bulking of sand
(A) Increases
(B) Decreases
(C) First increases to a certain maximum value and then decreases
(D) First decreases to a certain minimum value and then increases
95. 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
96. Compared to mild steel, cast iron has
(i) High compressive strength
(ii) High tensile strength
(iii) Low compressive strength
(iv) Low tensile strength
The correct answer is
(A) (i) and (ii)
(B) (ii) and (iii)
(C) (iii) and (iv)
(D) (i) and (iv)
97. In a mortar, the binding material is
(A) Cement
(B) Sand
(C) Surkhi
(D) Cinder
98. The vehicle used in case of enamel paints is usually
(A) Linseed oil
(B) Water
(C) Varnish
(D) None of the above
99. In the method of condensation polymerization
(A) Low-molecular substances are removed from the high molecular substance
(B) The reaction proceeds with an evolution of ammonia
(C) The reaction proceeds with an evolution of hydrogen chloride
(D) All of the above
100. The slenderness ratio for masonry walls should not be more than
(A) 10
(B) 20
(C) 30
(D) 40
101. Sand stone is
(A) Sedimentary rock
(B) Metamorphic rock
(C) Igneous rock
(D) Volcanic rock
102. Which of the following represents a metamorphic rock?
(i) Slate
(ii) Shale
(iii) Quartzite
The correct answer is
(A) Only (iii)
(B) Both (i) and (iii)
(C) Both (ii) and (iii)
(D) All (i), (ii) and (iii)
103. For the manufacture of Portland cement, the proportions of raw materials used, are
(A) Lime 63% ; silica 22% ; other ingredients 15%
(B) Lime 22% ; silica 63% ; other ingredients 15%
(C) Silica 40% ; lime 40% ; other ingredients 20%
(D) Silica 70% ; lime 20% ; other ingredients 10%
104. A good building stone should not absorb water more than
(A) 5 %
(B) 10 %
(C) 15 %
(D) 20 %
105. Good quality stones must
(A) Be durable
(B) Be free from clay
(C) Resist action of acids
(D) All the above
106. Specific gravity for most of the building stones lies between
(A) 1.5 to 2.0
(B) 2.0 to 2.5
(C) 2.5 to 3.0
(D) 3.0 to 3.5
107. Initial setting time of cement for asbestos cement products should be not less than
(A) 30 minutes
(B) 50 minutes
(C) 75 minutes
(D) 90 minutes
108. The age of a tree can be known by examining
(A) Cambium layer
(B) Annular rings
(C) Medullary rays
(D) Heart wood
109. Pick up the correct statement from the following
(A) In basic Bessemer process, the steel heats the converter
(B) In open-hearth process, the furnace heats the steel
(C) In Siemens process, the impurities of pig iron are oxidised by the oxygen of the ore
(D) All the above
110. Percentage of silica in a good brick earth lies between
(A) 5 to 10 %
(B) 20 to 30 %
(C) 50 to 60 %
(D) 70 to 80 %
111. Resins are
(A) Not soluble in water
(B) Soluble in spirit
(C) Used in varnishes
(D) Left behind on evaporation of oil
112. Quick lime is
(i) Slow in setting
(ii) Rapid in slacking
(iii) Good in strength
The correct answer is
(A) Only (i)
(B) Only (ii)
(C) Both (i) and (ii)
(D) Both (ii) and (iii)
113. 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
114. As per IS specifications, the maximum final setting time for ordinary Portland cement should be
(A) 30 minutes
(B) 1 hour
(C) 6 hours
(D) 10 hours
115. Shingle is
(A) Decomposed laterite
(B) Crushed granite
(C) Water bound pebbles
(D) Air weathered rock
116. Proper amount of entrained air in concrete results in
(i) Better workability
(ii) Better resistance to freezing and thawing
(iii) Lesser workability
(iv) Less resistance to freezing and thawing
The correct answer is
(A) (i) and (ii)
(B) (i) and (iv)
(C) (ii) and (iii)
(D) (iii) and (iv)
117. 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
118. Assertion A : Paints with white lead base are not recommended for painting of iron works.
Reason R : Paints with white lead base do not check rusting of iron.
Select your answer according to the coding system given below:
(A) Both A and R is true and, R is the correct explanation of A
(B) Both A and R is true but R is not the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true
119. Pick up the correct statement from the following
(A) Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite
(B) Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite
(C) Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic
(D) All the above
120. Expansion Joints in masonry walls are provided in wall lengths usater than
(A) 10 m
(B) 20 m
(C) 30 m
(D) 40 m
121. Cast steel is manufactured by
(A) Cementation process
(B) Crucible process
(C) Bessemer process
(D) Open hearth process
122. Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica
(A) Basalt and marble are the only metamorphic rocks
(B) There is no sedimentary rock
(C) Granite is the only igneous rock
(D) Quartz and mica are minerals
123. The foliated structure is very common in
(A) Sedimentary rocks
(B) Igneous rocks
(C) Metamorphic rocks
(D) None of these
124. Cross cut saw is used for
(A) Cutting soft stones
(B) Cutting hard stones
(C) Cutting large blocks of stones
(D) Dressing stones
125. 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
126. A first class brick when immersed in cold water for 24 hours should not absorb water more than
(A) 15 %
(B) 20 %
(C) 22 %
(D) 25 %
127. The minimum compressive strength of 2nd class bricks should be
(A) 75 kg/cm2
(B) 90 kg/cm2
(C) 100 kg/cm2
(D) 120 kg/cm2
128. Which of the following bricks are used for lining of furnaces?
(A) Over-burnt bricks
(B) Under-burnt bricks
(C) Refractory bricks
(D) First class bricks
129. Bulking of sand is caused due to
(A) Surface moisture
(B) Air voids
(C) Viscosity
(D) Clay contents
130. According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than
(A) 7 MPa
(B) 11.5 MPa
(C) 16 MPa
(D) 21 MPa
131. 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
132. The amount of water used for one kg of distemper is
(A) 0.2 liter
(B) 0.4 liter
(C) 0.6 liter
(D) 0.8 liter
133. 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
134. The most important tool in brick laying for lifting and spreading mortar and for forming joints is
(A) Trowel
(B) Square
(C) Bolster
(D) Scutch
135. The weight of 1 m3 of brick earth, is about
(A) 1200 kg
(B) 1500 kg
(C) 1800 kg
(D) 2000 kg
136. Which of the following is a mineral?
(A) Basalt
(B) Granite
(C) Quartz
(D) Syenite
137. Age of a tree may be ascertained by
(A) Radius of its stem
(B) Circumference of its stem
(C) Number of branches
(D) Number of annual rings
138. Crushing strength of a good building stone should be more than
(A) 50 MPa
(B) 100 MPa
(C) 150 MPa
(D) 200 MPa
139. Generally wooden moulds are made from
(A) Ply wood
(B) Shishum wood
(C) Deodar wood
(D) Teak wood
140. The nominal size of the modular brick is
(A) 190 mm × 90 mm × 80 mm
(B) 190 mm × 190 mm × 90 mm
(C) 200 mm × 100 mm × 100 mm
(D) 200 mm × 200 mm × 100 mm
141. Bitumen is generally obtained from
(A) Organic material
(B) Synthetic material
(C) Petroleum product
(D) Coal
142. The main constituent which imparts hydraulicity to hydraulic lime is
(A) Calcium oxide
(B) Silica
(C) Clay
(D) Water
143. Calcination of iron ores is done
(A) To remove moisture
(B) To remove carbonic acid
(C) By roasting in heaps
(D) All the above
144. Which of the following cements is suitable for use in massive concrete structures such as large dams?
(A) Ordinary Portland cement
(B) Low heat cement
(C) Rapid hardening cement
(D) Sulphate resisting cement
145. The commonly used thinner in oil paints, is
(A) Naphtha
(B) Turpentine
(C) Both (a) and (b)
(D) None the these
146. Minimum thickness of wall where single Flemish bond can be used is
(A) Half brick thick
(B) One brick thick
(C) One and a half bricks thick
(D) Two bricks thick
147. The pigment used in paints for corrosive resistance, is
(A) White lead
(B) Ferrous oxide
(C) Zinc white
(D) Red lead
148. Slate is formed by metamorphic action on
(A) Shale
(B) Lime stone
(C) Sand stone
(D) Granite
149. Sea sand used in structures causes
(A) Dampness
(B) Efflorescence
(C) Disintegration
(D) All of these
150. The trunk of tree left after cutting all the branches is known as
(A) Log
(B) Batten
(C) Plank
(D) Baulk
151. The weight of a good quality brick when immersed in water for a period of 16 hours should not exceed the weight of dry brick
(A) 20 %
(B) 15 %
(C) 10 %
(D) None of these
152. Pug mill is used for
(A) Preparation of clay
(B) Moulding of clay
(C) Drying of bricks
(D) Burning of bricks
153. Pick up the synthetic resin from the following:
(A) Urea resin
(B) Phenolic resin
(C) Resorcinol resin
(D) All of these
154. Addition of pozzolana to ordinary Portland cement increases
(A) Bleeding
(B) Shrinkage
(C) Permeability
(D) Heat of hydration
155. Plastics are compounds of carbon with element
(A) Hydrogen
(B) Nitrogen
(C) Oxygen
(D) All of these
156. Paints with white lead base are suitable for painting of
(A) Wood work
(B) Iron work
(C) Both wood work and iron work
(D) None of the above
157. For a good building stone, its specific gravity should the greater than
(A) 1.5
(B) 1.7
(C) 2.2
(D) 2.7
158. Sandstone is a
(i) Sedimentary rock
(ii) Aqueous rock
(iii) Siliceous rock
The correct answer is
(A) Only (i)
(B) Both (i) and (ii)
(C) Both (i) and (iii)
(D) All (i), (ii) and (iii)
159. The rocks having alumina or clay as their major constituents are known as
(A) Siliceous rocks
(B) Argillaceous rocks
(C) Calcareous rocks
(D) Sedimentary rocks
160. The practical limit of moisture content achieved in air drying of timber is
(A) 5 %
(B) 15 %
(C) 25 %
(D) 35 %
161. Glazing of clay products, is done
(A) To improve their appearance
(B) To protect them from atmospheric effect
(C) To protect them from corrosive action
(D) All the above
162. Study the following statements.
(i) Hydraulic lime is suitable for white washing,
(ii) Fat lime is suitable for whitewashing,
(iii) Hydraulic lime is suitable for making mortar,
(iv) Fat lime is suitable for making mortar. The correct answer is
(A) (i) and (iv)
(B) (ii) and (iii)
(C) (i) and (ii)
(D) (iii) and (iv)
163. 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
164. Three basic raw materials which are needed in large quantities for production of steel are
(A) Iron ore, coal and sulphur
(B) Iron ore, carbon and sulphur
(C) Iron ore, coal and lime stone
(D) Iron ore, carbon and lime stone
165. To give a brilliant finish, the type of varnish used, is
(A) Water varnish
(B) Spirit varnish
(C) Turpentine varnish
(D) Oil varnish
166. Which of the following should be used for hearting of thicker walls?
(A) Headers
(B) Stretchers
(C) Brick bats
(D) Queen closer
167. Asbestos ______
(A) Is an excellent insulator for heat and electricity
(B) Is fire-proof and acid proof
(C) Has sp. gravity equal to 3.10
(D) All the above
168. A heavy stone is suitable for
(A) Arches
(B) Rubble masonry
(C) Roads
(D) Retaining walls
169. 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) All the above
170. The percentage of alumina in a good brick earth lies between
(A) 5 to 10 %
(B) 20 to 30 %
(C) 50 to 60 %
(D) 70 to 80 %
171. Pig iron made from haematite 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
172. Le-Chatelier’s device is used for determining the
(A) Setting time of cement
(B) Soundness of cement
(C) Tensile strength of cement
(D) Compressive strength of cement
173. Red short iron cracks when bent due to the presence of
(A) Sulphur
(B) Carbon
(C) Phosphorus
(D) Silicon
174. Percentage of carbon content in mild steel is
(A) Less than 0.25
(B) Between 0.25 and 0.7
(C) Between 0.7 and 1.5
(D) Greater than 1.5
175. The method of addition polymerization is used for obtaining:
(A) Polystyrene
(B) Polypropylene
(C) Polyvinylchloride
(D) All of these
176. Which of the following metamorphic rocks has the most weather resisting characteristics?
(A) Marble
(B) Quartzite
(C) Slate
(D) Lime stone
177. To retard the initial setting time of cement, the compound responsible, is
(A) Tri-calcium silicate
(B) Gypsum
(C) Di-calcium silicate
(D) Tri-calcium aluminate
178. Seasoning of timber is done for
(A) Increasing moisture content
(B) Decreasing moisture content
(C) Increasing strength of timber
(D) None to these
179. The steel used for the manufacture of rails, is
(A) Bessemer steel
(B) Mild steel
(C) Cast steel
(D) Stainless steel
180. Durability of building stone is affected by its
(A) Chemical composition
(B) Texture
(C) Resistance to atmosphere
(D) All the above
181. 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) All the above
182. Crushing strength of a first class brick should not be less than
(A) 3.5 N/mm²
(B) 7.0 N/mm²
(C) 10.5 N/mm²
(D) 14.0 N/mm²
183. 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) All the above
184. The main constituent of cement which is responsible for initial setting of cement is
(A) Di-calcium silicate
(B) Tri-calcium silicate
(C) Tri-calcium aluminate
(D) All of the above
185. Pick up the correct statement from the following:
(A) The low voltage porcelain is prepared by wet process
(B) The high voltage porcelain is prepared by dry process
(C) The low voltage porcelain is prepared by dry process
(D) None of the above
186. In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as
(A) English bond
(B) Double Flemish bond
(C) Zigzag bond
(D) Single Flemish bond
187. 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
188. Granite is not suitable for ordinary building purpose because
(A) It cannot be polished
(B) It is not a fire proof material
(C) It is costly
(D) It has less crushing strength
189. Lacquer paints
(A) Are generally applied on structural steel
(B) Are less durable as compared to enamel paints
(C) Consist of resin and nitro-cellulose
(D) All the above
190. Glazing is used to make earthenware
(A) Hard
(B) Soft
(C) Porous
(D) Impervious
191. In the cement the compound quickest to react with water, is
(A) Tri-calcium aluminate
(B) Tetra-calcium alumino-ferrite
(C) Tri-calcium silicate
(D) Di-calcium silicate
192. Which of the following gradients exerts maximum influence on properties of steel?
(A) Iron
(B) Carbon
(C) Manganese
(D) Sulphur
193. Stainless steel contains
(A) 18% of chromium and 8% nickel
(B) 8% of chromium and 18% of nickel
(C) 12% of chromium and 36% of nickel
(D) 36% of chromium and 12% of nickel
194. Excess of silica in brick earth results in
(A) Cracking and warping of bricks
(B) Loss of cohesion
(C) Enhancing the impermeability of bricks
(D) None of the above
195. Which one of the following is acid resistant asbestos?
(A) Actinolite asbestos
(B) Amosite asbestos
(C) Anthophylite asbestos
(D) All the above
196. The slump recommended for mass concrete is about
(A) 25 mm to 50 mm
(B) 50 mm to 100 mm
(C) 100 mm to 125 mm
(D) 125 mm to 150 mm
197. For preparing porcelains, the clay should be
(A) Sufficiently pure
(B) Of high degree of tenacity
(C) Of good plasticity
(D) All the above
198. For melting one tonne of cast iron
(A) 700 m3 air is required
(B) 20 kg limestone is required
(C) One quintal coke is required
(D) All the above
199. Pick up the correct statement regarding low heat cement from the following:
(A) It possesses less compressive strength
(B) Its initial setting time is about one hour
(C) Its final setting time is about 10 hours
(D) All the above
200. 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
201. The commonly used lime in white washing, is
(A) White lime
(B) Fat lime
(C) Hydraulic lime
(D) Quick lime
202. For slaking of 10 kg of CaO, the theoretical amount of water is
(A) 2.2 kg
(B) 1.5 kg
(C) 3.2 kg
(D) None of these
203. Plywood is made from
(A) Common timber
(B) Bamboo fibre
(C) Teak wood only
(D) Asbestos sheets
204. A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than
(A) 10 %
(B) 15 %
(C) 20 %
(D) 25 %
205. The preparation of surface of stone to obtain plain edges or to obtain stones of required size and shape is known as
(A) Quarrying of stones
(B) Blasting of stones
(C) Seasoning of stones
(D) Dressing of stones
206. The hardest rock is
(A) Marble
(B) Diamond
(C) Talc
(D) Quartz
207. Wrought iron is used for
(A) Structural works in beams
(B) Small sized water pipes
(C) Columns and struts
(D) None to these
208. Pick up the correct statement from the following:
(A) Corrugated sheet iron is made by passing plain sheets between grooved rollers
(B) Strength and stiffness of corrugated sheets are considerably increased
(C) Corrugated sheets are generally used on slanting roofs
(D) All the above
209. The process of mixing clay, water and other ingredients to make brick is known as
(A) Kneading
(B) Moulding
(C) Pugging
(D) Drying
210. The type of steel used for precision levelling staff, is
(A) Titanium steel
(B) Carbon steel
(C) Invar
(D) Stainless steel
211. Formula for quick lime, is
(A) CaCO3
(B) Ca(OH)2
(C) CO3CO2
(D) None to these
212. 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
213. The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is
(A) 1
(B) 2
(C) 3
(D) 4
214. Which one of the following polymers is obtained from condensation polymerization?
(A) Phenol formaldehyde
(B) Carbamide
(C) Melamine-formaldehyde
(D) All of these
215. 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
216. The moisture content in a well seasoned timber is
(A) 4 % to 6 %
(B) 10 % to 12 %
(C) 15 % to 20 %
(D) 100 %
217. The cement becomes unsound by the presence of excess
(A) Sulphur
(B) Magnesia
(C) Lime
(D) All of these
218. For one cubic metre of brick masonry, number of bricks required, is
(A) 400
(B) 425
(C) 450
(D) 500
219. Rapid hardening cement contains
(A) Tri-calcium silicate
(B) Tri-calcium aluminate
(C) Tetra-calcium alumino-ferrite
(D) Di-calcium silicate
220. In order of increasing percentage of silica, the correct sequence is
(A) Sandy clay, calcareous clay, pure clay
(B) Calcareous clay, pure clay, sandy clay
(C) Pure clay, sandy clay, calcareous clay
(D) None of these
221. Which of the following timbers is suitable for making sports goods?
(A) Mulberry
(B) Mahogany
(C) Sal
(D) Deodar
222. The stones obtained by blasting are used as
(A) Ballast in railways
(B) Aggregates for concrete
(C) Road metal
(D) All the above
223. Pick up the correct statement from the following
(A) Acid test is done to find out the weathering quality of stones
(B) Attrition test is done to find out the rate of wear of stones which are used in road construction
(C) Crushing test is done to find out the compressive strength of the stone
(D) All the above
224. Mastic asphalt is
(A) Water proof
(B) Fire proof
(C) Elastic
(D) All the above
225. Pick up the correct statement from the following:
(A) Lime is available in Free State
(B) Lime is available by dissolving calcium carbonate in water
(C) Lime is available by calcining calcium carbonate at 900°C
(D) Lime is nothing but calcium chloride
226. The frog of the brick in a brick masonry is generally kept on
(A) Bottom face
(B) Top face
(C) Shorter side
(D) Longer side
227. 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) All the above
228. For obtaining vinyl chloride acetate, the method used, is
(A) Addition polymerization
(B) Condensation polymerization
(C) Co-polymerization
(D) None of these
229. 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
230. The normal consistency of ordinary Portland cement is about
(A) 10 %
(B) 20 %
(C) 30 %
(D) 40 %
231. Lacquer is
(A) Oil paint
(B) Distemper
(C) Spirit varnish
(D) None to these
232. Plaster of Paris is obtained by calcining
(A) Bauxite
(B) Gypsum
(C) Lime stone
(D) None of these
233. 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) All the above
234. 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
235. The coefficient of hardness of stones used in road work should be greater than
(A) 10
(B) 12
(C) 15
(D) 17
236. Manganese steels
(A) Are non-magnetic
(B) Possess high electrical resistance
(C) Possess low coefficient of expansion
(D) All the above
237. The most commonly used base for timber painting, is
(A) Red lead
(B) Zinc white
(C) White lead
(D) Titanium white
238. 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) All the above
239. Pick up the correct statement from the following
(A) For thin structures subjected to wetting and drying, the water cement ratio should be 0.45
(B) For mass concrete structures subjected to wetting and drying, the water ratio should be 0.55
(C) For thin structures which remain continuously under water, the water-cement ratio by weight should be 0.55
(D) All the above
240. Quartzite is a
(A) Metamorphic rock
(B) Argillaceous rock
(C) Calcareous rock
(D) Siliceous rock
241. The plastics made from cellulose resin
(A) Are as clear as glass
(B) Are tough and strong
(C) Possess excellent electrical properties
(D) All the above
242. Polymerization helps to improve the property of
(A) Strength
(B) Rigidity
(C) Elasticity
(D) All of these
243. For filling cracks in masonry structures, the type of bitumen used, is
(A) Cut-back bitumen
(B) Bitumen-emulsion
(C) Blown bitumen
(D) Plastic bitumen
244. Expanded metal is
(A) Manufactured from steel sheets
(B) Used for reinforced concrete in road pavements
(C) Measured in term of SWM (short way mesh) and LWM (long way mesh)
(D) All the above
245. Pick up the plutonic rock from the following
(A) Granite
(B) Dolerite
(C) Basalt
(D) All the above
246. 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
247. Cement is said to be of good quality if
(A) Its colour is not greenish grey
(B) One feels cool by thrusting one’s hand in the cement bag
(C) A handful of cement thrown into a bucket of water does not float
(D) None of these
248. The silica is used for preparing
(A) Silica bricks
(B) Coke oven
(C) Lining for glass furnaces
(D) All of these
249. The timber having maximum resistance against white ants, is obtained from
(A) Chir
(B) Shishum
(C) Sal
(D) Teak
250. Duco is one of the patent forms of
(A) Emulsion paints
(B) Plastic paints
(C) Bituminous paints
(D) Cellulose paints
251. Quartzite, a metamorphic stone is
(A) Hard
(B) Brittle
(C) Crystalline
(D) All the above
252. If water required for 1 bag of cement is 30 litres, the water cement ratio is:
(A) 0.40
(B) 0.50
(C) 0.60
(D) None of these
253. A piece of timber whose thickness and width are respectively 5 cm and 10 cm is called
(A) Slate
(B) Plank
(C) Board
(D) Strip
254. The percentage of water for normal consistency, is
(A) 5% to 15%
(B) 10% to 25%
(C) 15% to 25%
(D) 20% to 30%
255. Pick up the correct statement from the following:
(A) The baked earth is called terra-cotta
(B) The articles prepared from clay which is burnt at low temperature and cooled down slowly, are called earthen-ware
(C) The articles prepared from refractory clays which as mixed with stone and crushed pottery, are called stone ware
(D) All the above
256. In a rock calcium carbonate predominates. State whether it is
(A) Siliceous rock
(B) Argillaceous rock
(C) Calcareous rock
(D) None of these
257. The cracks which extend from bark towards the sap wood in the cross section of a tree, are called
(A) Radial shakes
(B) Star shakes
(C) Heart shakes
(D) Cup shakes
258. The steel used for rails under heavy traffic and on sharp curves, is
(A) Nickel steel
(B) Chrome steel
(C) Manganese steel
(D) Vanadium steel
259. The steel used in R.C.C. work is
(A) Stainless steel
(B) Mild steel
(C) High carbon steel
(D) Wrought iron
260. Pick up the rock which is not a sedimentary rock from the following
(A) Gravel
(B) Sand stone
(C) Gypsum
(D) Dolerite
261. Acrylic is the name of
(A) Cellulose resin
(B) Alkyd resin
(C) Methyl methacrylate
(D) Cumarone-indene
262. The PVC doors and windows are preferred as they are
(A) Rust proof
(B) Rot proof
(C) Water proof
(D) All of these
263. The sequence of refractory materials according to increasing melting points is:
(A) Dolomite, Magnesia, Bauxite, Chromites
(B) Bauxite, Chromites, Dolomite, Magnesia
(C) Magnesia, Bauxite, Dolomite, Chromites
(D) None of these
264. Upto a maximum of 72% of iron, is available in
(A) Magnetite
(B) Limonite
(C) Siderite
(D) Iron pyrites
265. The melting point of silica is:
(A) 1570°C
(B) 1630°C
(C) 1730°C
(D) 1850°C
266. Lime stones are generally known as
(A) Aqueous rocks
(B) Sedimentary rocks
(C) Stratified rocks
(D) All the above
267. Stones used for rubble masonry must be
(A) Soft
(B) Hard
(C) Light
(D) Heavy
268. The property by virtue of which lime sets under water, is known as
(A) Slacking
(B) Setting
(C) Hydraulicity
(D) Calcining
269. Porcelain is used as
(A) Sanitary wares
(B) Electric insulators
(C) Storage vessels
(D) Reactor chambers
270. The lime which contains high percentage of calcium oxide, is generally called
(A) Fat lime
(B) Rich lime
(C) White lime
(D) None of these
271. Second class bricks
(A) Are of dark brown colour
(B) Produce a metallic sound when struck
(C) Are well burnt
(D) Are under burnt
272. Wrought iron contains carbon upto
(A) 0.25 %
(B) 1.0 %
(C) 1.5 %
(D) 2 %
273. The variety of pig iron used for manufacture of wrought iron, is
(A) Bessemer pig
(B) Grey or foundry pig
(C) White forge pig
(D) Mottled pig
274. Kaolin is chemically classified as
(A) Metamorphic rock
(B) Argillaceous rock
(C) Calcareous rock
(D) Siliceous rock
275. Sewer pipes are made of
(A) Earthen ware
(B) Stone ware
(C) Refractory clay
(D) All the above
276. 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
(A) Cementation process
(B) Crucible process
(C) Bessemer process
(D) Open hearth process
277. The rock generally used for roofing, is
(A) Granite
(B) Basalt
(C) Slate
(D) Pumice
278. The lime which contains mainly calcium oxide and slacks with water, is
(A) Fat lime
(B) Quick lime
(C) Hydraulic lime
(D) Poor lime
279. The standard size of masonry bricks, is
(A) 18 cm × 8 cm × 8 cm
(B) 19 cm × 9 cm × 9 cm
(C) 20 cm × 10 cm × 10 cm
(D) 21 cm × 11 cm × 11 cm
280. The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:
(A) 15, 75, 10
(B) 75, 10, 15
(C) 10, 15, 75
(D) 10, 75, 15
281. 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
282. Pick up correct statement from the following:
(A) Fibre boards are used for thermal and acoustic control
(B) Fibre boards are used for light weight standing members
(C) Fibre boards are obtained by impregnating a resin product on fibres
(D) All the above
283. Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as
(A) Quick setting cement
(B) Rapid hardening cement
(C) White cement
(D) Low heat Portland cement
284. 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) All the above
285. The minimum compressive strength of 1st class bricks should be
(A) 75 kg/cm2
(B) 90 kg/cm2
(C) 100 kg/cm2
(D) 120 kg/cm2
286. The cast iron when heated to red heat with powdered red haematite 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
287. 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 %
288. The usual percentages of clay and metal in cermet are
(A) 50%, 50%
(B) 60%, 40%
(C) 70%, 30%
(D) 80%, 20%
289. Pick up the correct statement from the following
(A) The plastic bottles are made by the process of blowing
(B) The application of thermo-setting resins on sheets of paper, is called laminating process
(C) The plastic articles made by placing raw material in the desired moulds, is known as moulding process
(D) All the above
290. The specific gravity of marble, is
(A) 2.50
(B) 2.60
(C) 2.66
(D) 2.72
291. 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
292. Pick up the correct statement from the following
(A) Rusting is caused due to combined action of air, moisture and carbon dioxide
(B) During rusting, first ferrous bicarbonates are formed
(C) On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
(D) All the above
293. The commonly used base for iron and steel work, is
(A) Red lead
(B) Zinc white
(C) White lead
(D) Titanium white
294. For high grade instruments the steel preferred to, is
(A) Cast steel
(B) Bessemer steel
(C) Mild steel
(D) Whitworth compressed steel
295. Bitumen felt is used for
(A) Water proofing
(B) Damp proofing
(C) Both (A) and (B)
(D) Neither (A) nor (B)
296. The most important constituent of an oil paint, is
(A) Thinner
(B) Vehicle
(C) Pigment
(D) All the above
297. 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) All the above
298. Brass is an alloy of
(A) Copper and zinc
(B) Zinc and lead
(C) Tin and silver
(D) Zinc and nickel
299. Pick up the polymineralic rock from the following:
(A) Quartz sand
(B) Pure gypsum
(C) Magnesite
(D) Granite
300. Pick up the hypabyssal rock from the following:
(A) Granite
(B) Dolerite
(C) Basalt
(D) All the above