Pick up the correct statement from the following:
Rusting is caused due to combined action of air, moisture and carbon dioxide
During rusting, first ferrous bicarbonates are formed
On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
All the above
Correct Answer :
D. All the above
Related Questions
The rock generally used for roofing, is
Granite
Basalt
Slate
Pumice
The most important tool in brick laying for lifting and spreading mortar and for forming joints is
Trowel
Square
Bolster
Scutch
Depending on the chemical composition and mechanical properties, iron may be classified as
Cast iron
Wrought iron
Steel
All the above
Acrylic is the name of
Cellulose resin
Alkyd resin
Methyl methacrylate
Cumarone-indene
The fire clay contains pure
Lime
Oxide of iron
Hydrated aluminium silicate
Magnesium
Pick up the correct statement from the following:
Plastics have generally low melting point
The coefficient of thermal expansion of plastics is about three times than that of steel
The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
All the above
Stucco paints are suitable for
Stone masonry
Brick walls
Both (A) and (B)
Neither (A) nor (B)
For light and ornamental casting, the most unsuitable pig iron, is
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
Oil varnish generally consists of
Synthetic resin and spirit
Oil, wax and resin
Resin, oil and turpentine
Spirit, oil and wax
Fibre glass
Retains heat-longer
Has a higher strength to weight ratio
Is shock proof and fire retardant
All the above
Name the type of cement from the following for canal linings:
Sulphate resisting cement
Rapid hardening cement
Quick setting cement
Pozzolana cement
Pick up the correct statement from the following:
The theory of formation of concrete is based on the phenomena of formation of voids
The bulking of sand is taken into account while volumetric proportioning of the aggregates
The dry sand and the sand completely flooded with water, have practically the same volume
All the above
The type of steel used for precision levelling staff, is
Titanium steel
Carbon steel
Invar
Stainless steel
Quartzite is a
Metamorphic rock
Argillaceous rock
Calcareous rock
Siliceous rock
The type of bond provided in brick masonry for carrying heavy loads is
Single Flemish bond
Double Flemish bond
English bond
Zigzag bond
The hardest rock is
Marble
Diamond
Talc
Quartz
Generally wooden moulds are made from
Ply wood
Shishum wood
Deodar wood
Teak wood
The steel used for rails under heavy traffic and on sharp curves, is
Nickel steel
Chrome steel
Manganese steel
Vanadium steel
Pick up the correct statement regarding low heat cement from the following:
It possesses less compressive strength
Its initial setting time is about one hour
Its final setting time is about 10 hours
All the above
Pick up the correct statement from the following:
The baked earth is called terra-cotta
The articles prepared from clay which is burnt at low temperature and cooled down slowly, are called earthen-ware
The articles prepared from refractory clays which as mixed with stone and crushed pottery, are called stone ware
All the above
Plywood has the advantage of
Greater tensile strength in longer direction
Greater tensile strength in shorter direction
Same tensile strength in all directions
None of the above
Which of the following cements is suitable for use in massive concrete structures such as large dams?
Ordinary Portland cement
Low heat cement
Rapid hardening cement
Sulphate resisting cement
Teak wood is suitable for
Sports articles
Furnitures
Railway sleepers
All the above
Chemically, marble is known as
Metamorphic rock
Argillaceous rock
Calcareous rock
Siliceous rock
In order of increasing percentage of silica, the correct sequence is
Sandy clay, calcareous clay, pure clay
Calcareous clay, pure clay, sandy clay
Pure clay, sandy clay, calcareous clay
None of these
Pick up the polymineralic rock from the following:
Quartz sand
Pure gypsum
Magnesite
Granite
Duco paints are
Plastic paints
Cellulose paints
Emulsion paints
Oil paints
Cross cut saw is used for
Cutting soft stones
Cutting hard stones
Cutting large blocks of stones
Dressing stones
The commonly used lime in white washing, is
White lime
Fat lime
Hydraulic lime
Quick lime
Asbestos is
Corrugated sheet used for roofing
An incombustible fire proof material
An organic substance
All the above