Bulking of sand is caused due to
Surface moisture
Air voids
Viscosity
Clay contents
Correct Answer :
A. Surface moisture
Related Questions
Putty is
Made with finely powdered chalk and linseed oil
Used for fixing glass panes
Softened by a solution of pearl ash and quick-lime soaked in water
All the above
Which of the following ingredients of the brick earth enables the brick to retain its shape?
Alumina
Silica
Iron
Magnesia
The PVC doors and windows are preferred as they are
Rust proof
Rot proof
Water proof
All of these
Pick up the incorrect statement from the following:
Hydraulic lime is generally obtained by burning kankar
Hydraulic lime sets slowly as compared to fat lime
Hydraulic lime is generally used in lime mortar
None of these
For making fly-ash building bricks, the following mix of fly-ash, sand and lime, is
80 : 13 : 7
70 : 20 : 10
60 : 35 : 5
None of these
The type of steel used for precision levelling staff, is
Titanium steel
Carbon steel
Invar
Stainless steel
After storage, the strength of cement
Decreases
Increases
Remains same
May increase or decrease
The lime which contains mainly calcium oxide and slacks with water, is
Fat lime
Quick lime
Hydraulic lime
Poor lime
The main ingredients of Portland cement are
Lime and silica
Lime and alumina
Silica and alumina
Lime and iron
Assertion A : Normally turpentine oil is recommended as thinner for indoor painting. Reason R : Turpentine oil is costlier than other thinners. Select your answer according to the coding system given below:
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
Laterite is a/an
Volcanic rock
Argillaceous rock
Calcareous rock
Siliceous rock
The silica is used for preparing
Silica bricks
Coke oven
Lining for glass furnaces
All of these
Asbestos
Is a natural fibrous mineral substance
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
Contains iron oxide and alumina
All the above
The portion of the brick without a triangular corner equal to half the width and half the length, is called
Closer
Queen closer
King closer
Squint brick
The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to
Grey cast iron
White cast iron
Mottled cast iron
Toughed cast iron
The most important constituent of an oil paint, is
Thinner
Vehicle
Pigment
All the above
Porcelain is used as:
Sanitary wares
Electric insulators
Storage vessels
Reactor chambers
The ultimate tensile strength of structural mild steel is about
160 N/mm²
260 N/mm²
420 N/mm²
520 N/mm²
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
Excess of silica in brick earth results in
Cracking and warping of bricks
Loss of cohesion
Enhancing the impermeability of bricks
None of the above
Second class bricks
Are of dark brown colour
Produce a metallic sound when struck
Are well burnt
Are under burnt
The rocks having alumina or clay as their major constituents are known as
Siliceous rocks
Argillaceous rocks
Calcareous rocks
Sedimentary rocks
Jumper is a tool used for
Testing of stones
Quarrying of stones
Dressing of stones
None of the above
The filler used in plastic bitumen, is
Shale powder
Talc powder
Asbestos powder
Plastic powder
Quick lime is
Calcium carbonate
Calcium oxide
Calcium hydroxide
None of the above
Blister steel
Is obtained by cementation process
Is full of fissures and cavities
Can be easily welded
All the above
Duco is one of the patent forms of
Emulsion paints
Plastic paints
Bituminous paints
Cellulose paints
Distemper is
A paint consisting of powdered chalk, pigments and water
A water proofing agent
A paint consisting of coloured cement and water
A drying agent
Dolomite is a lime stone which contains carbonate of magnesia upto
15 %
20 %
25 %
45 %
Pick up the polymineralic rock from the following:
Quartz sand
Pure gypsum
Magnesite
Granite