The most valuable timber may be obtained from
Chir
Shishum
Sal
Teak
Correct Answer :
D. Teak
Related Questions
Wrought iron contains carbon about
1.5% to 5.5%
0.5% to 1.75%
0.1% to 0.25%
None to these
The compound of Portland cement which reacts immediately with water and also sets first is
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
The cracks caused by shrinkage of the exterior surface of the wood exposed to atmosphere, are called:
Radial shakes
Heart shakes
Wind cracks
Twisted fibres
Mastic asphalt is normally used for
Sound insulation
Water proofing
Fire proofing
None to these
Asphalt is obtained from
Petroleum distillation
Bitumen distillation
Plastic distillation
None of these
The yield strength and tensile strength of low carbon steel may be improved by the addition of
Manganese
Chromium
Nickel
Vanadium
Crushing strength of a good building stone should be more than
50 MPa
100 MPa
150 MPa
200 MPa
The slag which floats on the surface of the molten iron generally contains
Lime (CaO) 45%
Silica (SiO2) 35%
Alumina (Al2O3) 12% and MgO, CaSO4, KMnO2 and FeO 8%
All the above
First class timber has an average life of
Less than one year
1 to 5 years
5 to 10 years
More than 10 years
A piece of timber whose thickness and width are respectively 5 cm and 10 cm is called
Slate
Plank
Board
Strip
Steel contains carbon approximately
1.50% to 5.6%
0.05% to 1.75%
0.25 %
None to these
The presence of original rounded surface on the manufactured piece of timber, is called
Wane
Torn grain
Diagonal grain
Chipmark
Which of the following timbers is suitable for making sports goods?
Mulberry
Mahogany
Sal
Deodar
Rapid hardening cement attains early strength due to
Larger proportion of lime grounded finer than normal cement
Lesser proportion of lime grounded coarser than normal cement
Lesser proportion of lime grounded finer than normal cement
Excess percentage of gypsum
Gypsum consists of
H₂S and CO₂
CaSO4 and H₂O
Lime and H₂O
CO₂ and calcium
Pick up the correct statement from the following:
Catalysts are added to assist and accelerate the hardening of resin
The fillers are inert materials and they impart strength and hardness
Fibrous fillers increase thermal resistance
All the above
The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:
15, 75, 10
75, 10, 15
10, 15, 75
10, 75, 15
Pick up the correct statement from the following:
The distinct plane of division along which a stone can easily be split, is called natural bed of stone
The natural bed of sedimentary rocks is along the planes of stratification
The natural bed of igneous rocks is not defined
All the above
Most commonly used solvent in oil paints, is
Petroleum
Spirit
Coal tar
Turpentine
The normal curing period for lime mortar, is:
1 day
3 days
7 days
10 days
Slate is formed by metamorphic action on
Shale
Lime stone
Sand stone
Granite
The percentage of alumina and silica in good fire clay vary respectively is
25, 75
30, 70
35, 65
All of these
The percentage of water for normal consistency, is
5% to 15%
10% to 25%
15% to 25%
20% to 30%
In arches, stratified stones are placed so that their planes are
Parallel
Perpendicular
Radial
None of these
Linseed oil is used in paints as
Thinner
Vehicle
Base
Drier
Duco is one of the patent forms of
Emulsion paints
Plastic paints
Bituminous paints
Cellulose paints
Slacking of lime is affected by
Keeping it exposed to air
Immersing the lime in water
Crushing the lime lumps
None of these
The silica is used for preparing
Silica bricks
Coke oven
Lining for glass furnaces
All of these
The minimum compressive strength of 2nd class bricks should be
75 kg/cm2
90 kg/cm2
100 kg/cm2
120 kg/cm2
Pick up the correct statement from the following:
The theory of formation of concrete is based on the phenomena of formation of voids
The bulking of sand is taken into account while volumetric proportioning of the aggregates
The dry sand and the sand completely flooded with water, have practically the same volume
All the above