To retard the initial setting time of cement, the compound responsible, is
Tri-calcium silicate
Gypsum
Di-calcium silicate
Tri-calcium aluminate
Correct Answer :
B. Gypsum
Related Questions
Jumper is a tool used for
Testing of stones
Quarrying of stones
Dressing of stones
None of the above
Which one of the following polymers is obtained from condensation polymerization?
Phenol formaldehyde
Carbamide
Melamine-formaldehyde
All of these
The lime which contains mainly calcium oxide and slacks with water, is
Fat lime
Quick lime
Hydraulic lime
Poor lime
Paints with white lead base are suitable for painting of
Wood work
Iron work
Both wood work and iron work
None of the above
The rocks in which argil (or clay) predominates, are called
Siliceous rocks
Argillaceous rocks
Calcareous rocks
Igneous rocks
Slump test for concrete is carried out, to determine
Strength
Durability
Workability
Water content
The age of a tree can be known by examining
Cambium layer
Annular rings
Medullary rays
Heart wood
Pick up correct statement from the following:
Fibre boards are used for thermal and acoustic control
Fibre boards are used for light weight standing members
Fibre boards are obtained by impregnating a resin product on fibres
All the above
Number of bricks required for one cubic metre of brick masonry is
400
450
500
550
Minimum thickness of wall where single Flemish bond can be used is
Half brick thick
One brick thick
One and a half bricks thick
Two bricks thick
For obtaining vinyl chloride acetate, the method used, is
Addition polymerization
Condensation polymerization
Co-polymerization
None of these
Water paint is a
White wash
Colour wash
Whiting
All the above
The rocks which are formed due to pouring of magma at the earth's surface are called
Plutonic rocks
Hypabyssal rocks
Volcanic rocks
Igneous rocks
Quick setting cement is produced by adding
Less amount of gypsum in very fine powdered form
More amount of gypsum in very fine powdered form
Aluminium sulphate in very fine powdered form
Pozzolana in very fine powdered form
Glazing is used to make earthenware
Hard
Soft
Porous
Impervious
Expansion Joints in masonry walls are provided in wall lengths usater than
10 m
20 m
30 m
40 m
Seasoning of timber is done
To make it water proof
To paint its surface
To increase its temperature
To remove water
The harmonious mixing of the clay ingredients, is known as
Weathering
Blending
Tempering
None of these
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
Teak wood is suitable for
Sports articles
Furnitures
Railway sleepers
All the above
Elastomers can extend upto
Five times their original dimensions
Seven times their original dimensions
Ten times their original dimensions
Three times their original dimensions
After storage, the strength of cement
Decreases
Increases
Remains same
May increase or decrease
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
For a 50 kg cement bag water required, is
16.5 litres
18.5 litres
20.5 litres
22.5 litres
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
Bitumen felt
Is used as water proofing material
Is used as damp proofing material
Is made from bitumen and hessian fibres
All the above
Quartzite is a
Metamorphic rock
Argillaceous rock
Calcareous rock
Siliceous rock
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
The melting point of silica is:
1570°C
1630°C
1730°C
1850°C
Study the following statements. (i) Hydraulic lime is suitable for white washing, (ii) Fat lime is suitable for whitewashing, (iii) Hydraulic lime is suitable for making mortar, (iv) Fat lime is suitable for making mortar. The correct answer is
(i) and (iv)
(ii) and (iii)
(i) and (ii)
(iii) and (iv)