Percentage of silica in a good brick earth lies between
5 to 10 %
20 to 30 %
50 to 60 %
70 to 80 %
Correct Answer :
C. 50 to 60 %
Related Questions
Slate is formed by metamorphic action on
Shale
Lime stone
Sand stone
Granite
Which one of the following polymers is obtained from condensation polymerization?
Phenol formaldehyde
Carbamide
Melamine-formaldehyde
All of these
Veneering means
Carving out designs on timber planks
Chemically treating timber planks
Thick layer of superior wood glued to inferior wood
Thin layer of superior wood glued to inferior wood
The filler used in plastic bitumen, is
Shale powder
Talc powder
Asbestos powder
Plastic powder
Pug mill is used for
Preparation of clay
Moulding of clay
Drying of bricks
Burning of bricks
Portland pozzolana cement possesses
Higher resistance to chemical attack
Lower heat of hydration
Lower shrinkage on drying
All the above
Pick up the correct statement from the following:
Blisters in the finished wrought iron, are caused due to the reaction between oxide of iron and carbon
The edges of a finished wrought iron are rough due to red shortage
Pig iron (charcoal) is manufactured from magnetic ore (Fe3O4)
All the above
Laterite is a/an
Volcanic rock
Argillaceous rock
Calcareous rock
Siliceous rock
The timber having maximum resistance against white ants, is obtained from
Chir
Shishum
Sal
Teak
For testing compressive strength of cement, the size of cube used is
50 mm
70.6 mm
100 mm
150 mm
Age of a tree may be ascertained by
Radius of its stem
Circumference of its stem
Number of branches
Number of annual rings
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
The lime which contains mainly calcium oxide and slacks with water, is
Fat lime
Quick lime
Hydraulic lime
Poor lime
The most common admixture which is used to accelerate the initial set of concrete is
Gypsum
Calcium chloride
Calcium carbonate
None of the above
The usual percentages of clay and metal in cermet are:
50%, 50%
60%, 40%
70%, 30%
80%, 20%
Polymerization helps to improve the property of
Strength
Rigidity
Elasticity
All of these
Non acid-resistant asbestos is:
Tremolite asbestos
Chrysotile asbestos
Amosite asbestos
None of these
Second class bricks
Are of dark brown colour
Produce a metallic sound when struck
Are well burnt
Are under burnt
The commonly used drying oil for oil paints, is
Olive oil
Linseed oil
Kerosene oil
Acetate of lead
Based on its dry weight, a freshly felled tree may contain water
25 %
50 %
75 %
100 %
The hardest rock is
Marble
Diamond
Talc
Quartz
Bitumen felt is used for
Water proofing
Damp proofing
Both (A) and (B)
Neither (A) nor (B)
Pick up the correct characteristic of Pyroxene from the following:
It forms octagonal crystals
It converts to chlorine by hydration
Its density is 2.3 to 3.6 g/cm2
All the above
Linseed oil is used in paints as
Thinner
Vehicle
Base
Drier
Mastic asphalt is normally used for
Sound insulation
Water proofing
Fire proofing
None to these
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
Rocks formed due to alteration of original structure due to heat and excessive pressure are called
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
Which of the following sedimentary rocks changes into quartzite by metamorphic action?
Sand stone
Lime stone
Shale
Gypsum
Pick up the correct statement from the following:
For thin structures subjected to wetting and drying, the water cement ratio should be 0.45
For mass concrete structures subjected to wetting and drying, the water ratio should be 0.55
For thin structures which remain continuously under water, the watercement ratio by weight should be 0.55
All the above
The thermosetting plastic
Becomes rigid when moulded at suitable pressure and temperature
At 127°C to 177°C permanently set and further application of heat does not soften it
Chars at 343°C
All the above