The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is
20
15
5
0
Correct Answer :
D. 0
Related Questions
Manganese steels
Are non-magnetic
Possess high electrical resistance
Possess low coefficient of expansion
All the above
In the method of condensation polymerization,
Low-molecular substances are removed from the high molecular substance
The reaction proceeds with an evolution of ammonia
The reaction proceeds with an evolution of hydrogen chloride
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The minimum compressive strength of 2nd class bricks should be
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90 kg/cm2
100 kg/cm2
120 kg/cm2
Pick up the correct statement from the following:
Styrene resin is produced from ethylene which is made from petroleum
Styrene resin is light in weight
Styrene resin transmits ultraviolet waves of light
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If water required for 1 bag of cement is 30 litres, the water cement ratio is:
0.40
0.50
0.60
None of these
Clay and silt content in a good brick earth must be at least
50 %
40 %
30 %
25 %
The silica is used for preparing
Silica bricks
Coke oven
Lining for glass furnaces
All of these
Mastic asphalt is generally used for
Damp proof course
Water proof layer
Partition walls
Both (A) and (B)
The rocks formed by gradual deposition, are called
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
The kiln which may work throughout the year, is
Clamp
Bull's kiln
Hoffman's kiln
None of these
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
Gypsum consists of
H₂S and CO₂
CaSO4 and H₂O
Lime and H₂O
CO₂ and calcium
Cast iron is used for
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Small sized water pipes
Columns and struts
None to these
Acrylic sheets
Possess 10 to 17 times greater breakage resistance than that of glass of equivalent thickness
Are generally unaffected by most household detergents
Possess the light transmission rate of 93%
All the above
The wedging is adopted for quarrying costly stratified rock such as
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Limestone
All the above
If P is the percentage of water required for normal consistency, water to be added for determination of initial setting time, is
0.70 P
0.75 P
0.80 P
0.85 P
A ferrous metal is
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Wrought iron
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All the above
Non acid-resistant asbestos is:
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Chrysotile asbestos
Amosite asbestos
None of these
Duco is one of the patent forms of
Emulsion paints
Plastic paints
Bituminous paints
Cellulose paints
Lime concrete is generally used for
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Flooring at ground level
Both (A) and (B)
Neither (A) nor (B)
Red short iron cracks when bent due to the presence of
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Carbon
Phosphorus
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Most commonly used solvent in oil paints, is
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For testing compressive strength of cement, the size of cube used is
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100 mm
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Pick up the correct statement from the following:
In stone arches, the stones are placed with their natural beds radial
In cornices, the stones are placed with their natural beds as vertical
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Is fire-proof and acid proof
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All the above
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15% of cobalt
20% of cobalt
35% of cobalt
45% of cobalt