The minimum compressive strength of 1st class bricks should be
75 kg/cm2
90 kg/cm2
100 kg/cm2
120 kg/cm2
Correct Answer :
C. 100 kg/cm2
Related Questions
The main function of alumina in brick earth is
To impart plasticity
To make the brick durable
To prevent shrinkage
To make the brick impermeable
Which one of the following is an air binding material?
Gypsum
Acid-resistant cement
Quick lime
All of these
The compound of Portland cement which contributes to the strength after two to three years is
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra-calcium alumino ferrite
Which of the following is the purest form of iron?
Cast iron
Wrought iron
Mild steel
High carbon steel
A good quality stone absorbs water less than
5 %
10 %
15 %
25 %
Lacquer is
Oil paint
Distemper
Spirit varnish
None to these
Pick up the correct statement from the following:
Rust is due to formation of oxides
Cast iron oxidises less
Steel oxidises most
All the above
The age of a tree can be known by examining
Cambium layer
Annular rings
Medullary rays
Heart wood
In arches, stratified stones are placed so that their planes are
Parallel
Perpendicular
Radial
None of these
Expanded metal is
Manufactured from steel sheets
Used for reinforced concrete in road pavements
Measured in term of SWM (short way mesh) and LWM (long way mesh)
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
The most important constituent of an oil paint, is
Thinner
Vehicle
Pigment
All the above
Acrylic sheets
Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness
Are generally unaffected by most household detergents
Possess the light transmission rate of 93%
All the above
Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as
Quick setting cement
Rapid hardening cement
White cement
Low heat Portland cement
Dolomite is a lime stone which contains carbonate of magnesia upto
15 %
20 %
25 %
45 %
The tendency of a stone is, to split along:
Texture
Fracture
Cleavage
Structure
Sea sand used in structures causes
Dampness
Efflorescence
Disintegration
All of these
Quick lime is (i) Slow in setting (ii) Rapid in slacking (iii) Good in strength The correct answer is
Only (i)
Only (ii)
Both (i) and (ii)
Both (ii) and (iii)
The steel used in R.C.C. work is
Stainless steel
Mild steel
High carbon steel
Wrought iron
Which of the following ingredients of the brick earth enables the brick to retain its shape?
Alumina
Silica
Iron
Magnesia
Pug mill is used for
Preparation of clay
Moulding of clay
Drying of bricks
Burning of bricks
Bitumen may be dissolved in
Carbondioxide
Water
Sodium chloride
Carbon disulphide
The foliated structure is very common in
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
Which of the following metamorphic rocks has the most weather resisting characteristics?
Marble
Quartzite
Slate
Lime stone
Which of the following is a rock?
Quartz
Mica
Gypsum
None of the above
Stucco paints are suitable for
Stone masonry
Brick walls
Both (A) and (B)
Neither (A) nor (B)
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
For light and ornamental casting, the most unsuitable pig iron, is
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
The portion of a brick cut to form angles other than right angles in plan, is known as
Queen closer
King closer
Closer
Squint brick
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