The main ingredients of Portland cement are
Lime and silica
Lime and alumina
Silica and alumina
Lime and iron
Correct Answer :
A. Lime and silica
Related Questions
For the manufacture of stainless steel, steel is mixed with
Chromium
Nickel
Tungsten
None of these
A prime coat is given to steel work with
An oxide of iron paint
A mixture of white lead and lead paint
A special paint
Cement paint
Minimum of 40% of iron, is available in
Magnetite
Red haematite
Limonite
Black band
Plywood is obtained by gluing wooden sheets at
100 to 150 N/cm2
100 to 130°C
Both (A) and (B)
Neither (A) nor (B)
First class timber has an average life of
Less than one year
1 to 5 years
5 to 10 years
More than 10 years
Pick up the correct statement from the following:
The plywoods do not split or crack due to changes in atmosphere
The commercial plywoods are available upto 150 cm wide and upto 300 cm long
The plywoods possess uniform tensile strength in all directions
All the above
Ground glass
Is made by grinding its one side
Is made by melting powdered glass paints surface
Is used for getting light without transparency
All the above
According to IS 399-1963, the weight of the timber is specified at
8% moisture content
10% moisture content
12% moisture content
14% moisture content
The trunk of tree left after cutting all the branches is known as
Log
Batten
Plank
Baulk
For testing compressive strength of cement, the size of cube used is
50 mm
70.6 mm
100 mm
150 mm
Cast steel is manufactured by
Cementation process
Crucible process
Bessemer process
Open hearth process
Percentage content of silica in window glass, is
40 to 45
50 to 55
60 to 65
70 to 75
Pick up the correct statement from the following:
Alexander Parkes, a Scottish chemist prepared a hard material by mixing camphor and alcohol with nitro cellulose and called it, as Parkesite
Dr. L. Bakeland, a Belgian scientist prepared a product known as Bakelite
Pollark, an Austrian scientist prepared a substance from urea and formaldehyde and called it Plastic
All the above
Most commonly used solvent in oil paints, is
Petroleum
Spirit
Coal tar
Turpentine
Good quality stones must
Be durable
Be free from clay
Resist action of acids
All the above
Which one of the following is used for preparing porcelain?
Clay
Feldspar
Quartz
All of these
The initial setting time of lime-pozzolana, is
30 minutes
60 minutes
90 minutes
120 minutes
Soundness test of cement determines
Quality of free lime
Ultimate strength
Durability
Initial setting
Chlorite, a green colour mineral is mainly derived from the decomposition of
Augite
Biotite
Hornblende
All of these
Slate is formed by metamorphic action on
Shale
Lime stone
Sand stone
Granite
Cast iron is used for
Structural works in beams
Small sized water pipes
Columns and struts
None to these
For sanitary pipes and chemical stonewares,
Salt glazing is used
Lead glazing is used
Opaque glazing is used
None of these
The normal consistency of ordinary Portland cement is about
10 %
20 %
30 %
40 %
A heavy stone is suitable for
Arches
Rubble masonry
Roads
Retaining walls
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
Cast iron contains carbon approximately
1.5% to 5.5%
0.05% to 1.75%
0.250 %
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
Asphalt is obtained from
Petroleum distillation
Bitumen distillation
Plastic distillation
None of these
Pick up the correct statement from the following:
Lime is available in Free State
Lime is available by dissolving calcium carbonate in water
Lime is available by calcining calcium carbonate at 900°C
Lime is nothing but calcium chloride
Due to attack of dry rot, the timber
Cracks
Shrinks
Reduces to powder
None of these