Timber In Building Materials objective question and answer
37. After felling and separating branches the tree is known as
(a) log
(b) converted timber
(c) rough timber
(d) none of the above
Answer: c
38. Which one of the following does not belong to exogenous tree
(a) deodar
(b) pine
(c) mahogany
(d) bamboo
Answer: c
39. Which one of the following dose not belong to endogenous trees
(a) teak
(b) coconut
(c) bamboo
(d) cane
Answer: c
40. On the basis of durability test, Forest Research Institute of India, Dehradun, a tree is highly durable if its average life is more than
(a) 5 years
(b) 10 years
(c) 15 years
(d) 20 years
Answer: b
41. The trees, of which leaves fall in autumn and new ones appear in spring are classified as
(a) coniferous trees
(b) deciduous trees
(c) endogenous trees
(d) none of the above
Answer: b
42. The oldest part of exogenous tree is
(a) pith
(b) heartwood
(c) sapwood
(d) cambium layer
Answer: a
43. Age of exogenous tree can be judged from
(a) medullary rays
(b) annual rings
(c) cambium layer
(d) inner bark
Answer: b
44. The layer between the dark and sapwood which is yet to be converted into wood is known as
(a) pith
(b) heartwood
(c) softwood
(d) cambium layer
Answer: d
45. Which one of the following is softwood
(a) deodar
(b) teak
(c) sal
(d) mahogany
Answer: a
46. Which one of the following is not a softwood:
(a) oak
(b) pine
(c) deodar
(d) bamboo
Answer: a
47. On the basis of availability, timber is classified as
(a) I. II, III Class
(b) grade I, II, and III
(c) A, B, C Class
(d) X, Y, Z Class
Answer: d
48. The main purpose of seasoning of timber is to
(a) reduce moisture content
(b) make it fire resistant
(c) make it waterproof
(d) none of the above
Answer: a
49. Seasoning makes timber
(a) durable
(b) light, strong and stable
(c) resistant to fungi and termites
(d) all of the above
Answer: d
50. Which of the following statements is not correct?
(a) by kiln seasoning moisture content can be reduced to the desired extent.
(b) kiln seasoning is quicker than natural seasoning.
(c) kiln seasoning is superior to natural seasoning.
(d) kiln seasoning needs less stacking place than natural seasoning.
Answer: c
51. In water seasoning
(a) timber is placed with thicker end pointing upstream
(b) timber is placed with thicker end pointing downstream
(c) timber log is placed at right angle to the stream
(d) timber may be placed in any direction
Answer: a
52. Most economical method of sawing wood is
(a) ordinary sawing
(b) quarter sawing
(c) tangential sawing
(d) radial sawing
Answer: a
53. Sections of more uniform moisture content are obtained by
(a) ordinary sawing
(b) quarter sawing
(c) tangential sawing
(d) radial sawing
Answer: b
54. The defect in timber due to broken branch of the tree during the tree growth is
(a) knot
(b) shake
(c) rind gall
(d) burl
Answer: a
55. Due to improper cutting of the branches during the growth of the tree, the defect caused in timber is
(a) shake
(b) rind gall
(c) twisted fibre
(d) burl
Answer: b
56. Stain appears in wood due to
(a) poor ventilation during storage
(b) contact with water and chemicals for long time
(c) shock when it was young
(d) crushing during growth
Answer: b
57. Honeycomb and cracks may occur in timber due to
(a) erroneous conversion
(b) erroneous seasoning
(c) attack by fungi
(d) contact with water for a long time
Answer: b
58. Which one of the following is not a preservative of timber
(a) solignum salt
(b) chemical salt
(c) creosote
(d) solution of barium hydroxide
Answer: d
59. A thin sheet of wood sliced from a log is called
(a) plywood
(b) lamin board
(c) veneer
(d) particle board
Answer: c
60. In a plywood the veneers are placed such that the grains of a layer are
(a) at 45° to the grains of a layer below it
(b) at 60° to the grains of a layer below it
(c) at right angles to the layer below it
(d) at 180° to the grains of a layer below it
Answer: c
61. Plywood is identified by
(a) volume
(b) weight
(c) area
(d) thickness
Answer: d
62. An assembled product made up of veneers and adhesives is called
(a) batten
(b) plank
(c) board
(d) plywood
Answer: d
63. To get plywood of thickness 25 mm, minimum number of plies is
(a) 5
(b) 7
(c) 9
(d) 11
Answer: d
64. Particle boards are manufactured by using
(a) chips of wood, rice husk and bagasse
(b) strips of wood of width 25–80 mm
(c) wood pulp
(d) none of the above
Answer: a
65. The wood that cannot be attacked by white ants is
(a) mahogany
(b) rosewood
(c) sissoo
(d) teak
Answer: d
66. The standard size of bricks as per Indian Standards is
(a) 230 × 120 × 80 mm
(b) 200 × 100 × 100 mm
(c) 190 × 90 × 90 mm
(d) 190 × 100 × 100 mm
Answer: c
67. Red colour of brick is due to the presence of
(a) lime
(b) silica
(c) manganese
(d) iron oxide
Answer: d
68. Excess of lime in the brick earth makes the bricks
(a) brittle and weak
(b) crack and warp
(c) melt and lose shape
(d) improve durability
Answer: c
69. Excess of iron oxide in brick earth makes the bricks
(a) stronger
(b) darker
(c) brittle
(d) crack
Answer: b
70. Alumina in brick earth gives the bricks
(a) strength
(b) colour
(c) plasticity
(d) resistance to shrinkage
Answer: c
71. Excess of alkalies in the brick earth results into
(a) brittleness
(b) white patches
(c) yellowish colour
(d) porous structure
Answer: b
72. Pug mill is used to
(a) blend clay
(b) tempering
(c) weathering clay
(d) burning bricks
Answer: b
73. The size of mould used for making bricks compared to size of brick is
(a) 10% more
(b) 5% more
(c) exactly equal
(d) 5% less
Answer: a
74. Pallet board is used to
(a) make frog in the brick
(b) to mount the mould
(c) for table moulding of bricks
(d) none of the above
Answer: b
75. In stiff mud process of machine moulding, water used for mixing is
(a) 8–12%
(b) 12–18%
(c) 20–24%
(d) 30%
Answer: b
76. Gradual drying of moulded bricks is necessary to
(a) prevent shrinkage
(b) permit shrinkage without cracking
(c) permit blending of alumina and silica
(d) none of the above
Answer: b
77. The brick is considered dry when the moisture content is
(a) 8%
(b) 5%
(c) 2%
(d) zero
Answer: c
78. Hand moulded bricks take ______ days for drying while stiff-mud machine made bricks ______
days.
(a) 30, 5
(b) 15, 2
(c) 10, 1
(d) 8, 1/4
Answer: b
79. The indentation mark left on bricks during the process of moulding are
(a) pallets
(b) fillets
(c) marks
(d) frog
Answer: d
80. Which one of the following statements is wrong about clamp burning
(a) it is cheap
(b) does not need skilled labour
(c) control on burning process is good
(d) burning process is slow
Answer: c
81. Continuous kiln is
(a) bull’s trench kiln
(b) Hoffman’s kiln
(c) tunnel kiln
(d) all of the above
Answer: d
82. The minimum strength of brick required for building wall is
(a) 7.5 N/mm²
(b) 5.0 N/mm²
(c) 3.5 N/mm²
(d) 2.5 N/mm²
Answer: c
83. To check the size of brick number of bricks to be kept side by side is
(a) 30
(b) 20
(c) 10
(d) 5
Answer: b
84. The bricks which may be used to build wall but to be provided with plaster are
(a) Ist Class
(b) IInd Class
(c) IIIrd Class
(d) IVth Class
Answer: b
85. The compressive strength of high duty bricks should be more than
(a) 40 N/mm²
(b) 20 N/mm²
(c) 5 N/mm²
(d) 3.5 N/mm²
Answer: a
86. Thickness of web of hollow bricks should not be less than
(a) 20 mm
(b) 16 mm
(c) 12 mm
(d) 8 mm
Answer: d
87. Compressive strength of paving bricks should not be less than
(a) 40 N/mm²
(b) 30 N/mm²
(c) 20 N/mm²
(d) 40 N/mm²
Answer: a
88. Field test for strength of good bricks is to drop it from a height of ______ and they should not
break
(a) 1.2 m
(b) 1.0 m
(c) 0.7 m
(d) 0.75 m
Answer: b
89. For making stabilized soil brick the soil is stabilized with
(a) sand
(b) coal
(c) cement
(d) salt
Answer: c
90. Refractory bricks resist
(a) high temperature
(b) chemical action
(c) action of frost
(d) all of the above
Answer: a
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