Pick up the compound responsible for early strength of cement from the following:
Tetra-calcium alumino-ferrite
Tri-calcium silicate
Tri-calcium aluminate
Di-calcium silicate
Correct Answer :
B. Tri-calcium silicate
Related Questions
Formula for quick lime, is
CaCO3
Ca(OH)2
CO3CO2
None to these
For melting one tonne of cast iron
700 m3 air is required
20 kg limestone is required
One quintal coke is required
All the above
Pick up the non-inflammable plastic from the following:
Cellulose acetate plastics
Polyvinyl chloride plastics
Phenol formaldehyde plastic
Urea formaldehyde plastic
Pick up the correct statement from the following:
The substance which consists of one primary chemical, is known as monomer
The polymer consists of thousands of monomers joined together
The polymer molecule is called macro-molecule
All the above
Stainless steel resists corrosion due to
Carbon
Sulphur
Vanadium
Chromium
The commonly used base for iron and steel work, is
Red lead
Zinc white
White lead
Titanium white
A badly mixed cement concrete results in
Segregation
Bleeding
Honey combing
None of these
In a mortar, the binding material is
Cement
Sand
Surkhi
Cinder
Gypsum consists of
H₂S and CO₂
CaSO4 and H₂O
Lime and H₂O
CO₂ and calcium
Initial setting of cement is caused due to
Tri-calcium silicate
Di-calcium silicate
Tri-calcium aluminate
Tetra calcium alumino ferrite
Steel contains carbon approximately
1.50% to 5.6%
0.05% to 1.75%
0.25 %
None to these
The amount of water used for one kg of distemper is
0.2 liter
0.4 liter
0.6 liter
0.8 liter
The plastics prepared from Vinyl resin are
Odourless
Non-toxic
Transparent
All of these
Which of the following is the purest form of iron?
Cast iron
Wrought iron
Mild steel
High carbon steel
After storage, the strength of cement
Decreases
Increases
Remains same
May increase or decrease
Apiece of sawn timber whose cross-sectional dimensions exceed 5 cm, in one direction and 20 cm in the other direction, is called a
Cant
Deal
Baulk
Strip
The hardest rock is
Marble
Diamond
Talc
Quartz
Lime stone is not a
Sedimentary rock
Stratified rock
Aqueous rock
Metamorphic rock
Initial setting time of cement for asbestos cement products should be not less than
30 minutes
50 minutes
75 minutes
90 minutes
Quick lime is
Calcium carbonate
Calcium oxide
Calcium hydroxide
None of the above
Which of the following sedimentary rocks changes into quartzite by metamorphic action?
Sand stone
Lime stone
Shale
Gypsum
According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than
7 MPa
11.5 MPa
16 MPa
21 MPa
Specific gravity for most of the building stones lies between
1.5 to 2.0
2.0 to 2.5
2.5 to 3.0
3.0 to 3.5
Plaster of Paris is obtained by calcining
Bauxite
Gypsum
Lime stone
None of these
The plastics made from cellulose resin
Are as clear as glass
Are tough and strong
Possess excellent electrical properties
All the above
Polymerization helps to improve the property of
Strength
Rigidity
Elasticity
All of these
The tendency of a stone is, to split along:
Texture
Fracture
Cleavage
Structure
Inner part of a timber log surrounding the pitch, is called
Sapwood
Cambium layer
Heart wood
None to these
Which of the following has more fire resisting characteristics?
Marble
Lime stone
Compact sand stone
Granite
Calcination of iron ores is done
To remove moisture
To remove carbonic acid
By roasting in heaps
All the above