1.Calcium silicate, potassium silicate and copper silicate
2.Sodium silicate, iron silicate and calcium silicate
3.Aluminium silicate, potassium silicate and iron silicate
4.Magnesium silicate, potassium silicate and zinc silicate
Dressing of stones is carried out to:
1.To provide employment to people
2.To make transport of stones to site easy and economic
3.To reduce water content of stone
4.To avoid further works on the stone
Fat lime is also called _________
Ferric oxide gives a very light yellow tint to the glass while ferrous oxide imparts a green colour.
4.Grinding and polishing
Fire-resistant mortar is obtained by the addition of ____________ to the powder of fire-bricks.
In order to develop hydraulicity, it is necessary to have _________ and _________ present in chemical combination with the limestone.
1.Alumina and carbon
2.Magnesium and carbon
3.Silica and carbon
4.Alumina and silica
In the silvering of glass, a thin coat of ______ is first applied on which silver is then deposited.
Increase in volume of the sand due to the presence of moisture is called ___________ of sand.
Litharge is _________
On the basis of the size of grains, the sand is classified into three categories â€“ coarse, fine, and gravelly sand.
2.Hammer faced finished
3.Rock faced stones
Slaked lime is __________
2.Hydrated oxide of calcium
3. Chemical compounds
The process of adding cement in order to improve the quality of lime mortar is known as __________
4.d) Calcium carbonate
What is sand blasting?
1.Process of making carvings on stone surface
4.Process of using sand to blast stone surface
What is sand composed of?
What is the colour of river sand?
What is the colour of sea sand?
What is the relation between LLR (Line of Least Resistance) and amount of explosives to be used?
1.Higher the LLR, higher the amount of explosive
2.Higher the LLR, lesser the amount of explosive
3.10% more explosive for every 1m of LLR
4.10% less explosive for every 1m of LLR
2.Water and sand
1.It readily hardens
2.The colour of fat lime is perfectly white
3.Fat lime slakes vigorously
4.Fat lime sets slowly in the presence of air
1.Good sand should be chemically inert
2.It should be clean
3.It should not contain any organic matter
4.It must contain salts that can attract moisture from the atmosphere
1.It should be water-resistant
2.It should have low homogeneity
3.It should have resistance to subsoil water pressure
4.It should be able to form solid waterproof plugs in voids of rocks
Which of the following substances is not used as a decolorizer in the manufacturing of glass?
1.Lime mortar (1:2)
2.Lime mortar (1:3)
3.Cement mortar (1:2)
4.Lime cinder mortar (1:4)
X-ray shielding mortar is a lightweight mortar having a bulk density of less than 1500 kg/m3.