The practical limit of moisture content achieved in air drying of timber is
5 %
15 %
25 %
35 %
Correct Answer :
B. 15 %
Related Questions
For the manufacture of stainless steel, steel is mixed with
Chromium
Nickel
Tungsten
None of these
Polymerization helps to improve the property of
Strength
Rigidity
Elasticity
All of these
The softest rock is
Marble
Diamond
Talc
Quartz
Pick up the correct statement from the following:
Hornblende mineral is brittle
Muscovite is also known as white mica and potash mica
Biotite is also known as black-mica
All the above
Priming consists of
One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil
8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
One part of white lead, 8 parts of chalk and one part of linseed oil
None to these
Varnish is a transparent or semi-transparent solution of resinous substances in
Alcohol
Linseed
Turpentine
All the above
The material generally not used as extender in paints, is
Powdered silica
Gypsum
Talc
Zinc white
Pick up the correct statement from the following:
Melamine is obtained from calcium carbide
Formaldehyde is prepared synthetically from methane
The melamine when reacted with formaldehyde forms the melamineformaldehyde resin
All the above
Sea sand used in structures causes
Dampness
Efflorescence
Disintegration
All of these
The harmonious mixing of the clay ingredients, is known as
Weathering
Blending
Tempering
None of these
Which of the following sedimentary rocks changes into quartzite by metamorphic action?
Sand stone
Lime stone
Shale
Gypsum
Bitumen felt
Is used as water proofing material
Is used as damp proofing material
Is made from bitumen and hessian fibres
All the above
The commonly used raw material in the manufacture of cement, is
Slate
Sand stone
Lime stone
Basalt
Which of the following ingredients of the brick earth enables the brick to retain its shape?
Alumina
Silica
Iron
Magnesia
The basic purpose of a retarder in concrete is
To increase the initial setting time of cement paste in concrete
To decrease the initial setting time of cement paste in concrete
To render the concrete more water tight
To improve the workability of concrete mix
Pick up the correct statement from the following: Method of sawing timber
Tangentially to annual rings, is known as tangential method
In four quarters such that each board cuts annual rings at angles not less than 45°, is known as quarter sawing method
Cut out of quarter logs, parallel to the medullary rays and perpendicular to annual rings, is known as radial sawing
All the above
Pig iron obtained from the furnace which is properly provided with fuel at a very high temperature, is called
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as
English bond
Double Flemish bond
Zigzag bond
Single Flemish bond
Pick up the correct statement from the following:
Adding 5% to 6% of moisture content by weight, increases the volume of dry sand from 18% to 38%
The bulking of fine sand is more than that of coarse sand
If the percentage content of moisture exceeds 10%, increase in bulk of sand starts increasing
All the above
Clay and silt content in a good brick earth must be at least
50 %
40 %
30 %
25 %
Which of the following cements is suitable for use in massive concrete structures such as large dams?
Ordinary Portland cement
Low heat cement
Rapid hardening cement
Sulphate resisting cement
Bituminous fells are used for
Covering A.C. sheets
Covering sloping roofs
D.P.C.
None to these
A badly mixed cement concrete results in
Segregation
Bleeding
Honey combing
None of these
The foliated structure is very common in
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
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
Pick up the correct statement from the following:
The baked earth is called terra-cotta
The articles prepared from clay which is burnt at low temperature and cooled down slowly, are called earthen-ware
The articles prepared from refractory clays which as mixed with stone and crushed pottery, are called stone ware
All the above
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
If water required for 1 bag of cement is 30 litres, the water cement ratio is:
0.40
0.50
0.60
None of these
The frog of the brick in a brick masonry is generally kept on
Bottom face
Top face
Shorter side
Longer side
Pick up the correct statement from the following:
Plastics have generally low melting point
The coefficient of thermal expansion of plastics is about three times than that of steel
The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
All the above