The most commonly used synthetic abrasive is
Aluminium carbide
Boric acid
Silicon
All of these
Correct Answer :
D. All of these
Related Questions
For a 50 kg cement bag water required, is
16.5 litres
18.5 litres
20.5 litres
22.5 litres
Snowcrete is one of the patent forms of
Distempers
Water proof cement paints
Enamel paints
Cellulose paints
Pick up the correct statement from the following:
Air bubbles in casting produce a dull sound by tapping their surfaces lightly with a hammer
Cupola furnace is used for the manufacture of cast iron
Red short iron is of no value for welding purpose
All the above
Pick up correct statement from the following:
Fibre boards are used for thermal and acoustic control
Fibre boards are used for light weight standing members
Fibre boards are obtained by impregnating a resin product on fibres
All the above
For light and ornamental casting, the most unsuitable pig iron, is
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
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
A first class brick when immersed in cold water for 24 hours should not absorb water more than
15 %
20 %
22 %
25 %
Slump test for concrete is carried out, to determine
Strength
Durability
Workability
Water content
The frog of a brick is normally made on its
Top face
Bottom face
Longer face
Shorter side
In brick masonry the bond produced by laying alternate headers and stretchers in each course is known as
English bond
Double Flemish bond
Zigzag bond
Single Flemish bond
Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica
Basalt and marble are the only metamorphic rocks
There is no sedimentary rock
Granite is the only igneous rock
Quartz and mica are minerals
Second class bricks
Are of dark brown colour
Produce a metallic sound when struck
Are well burnt
Are under burnt
The material generally not used as extender in paints, is
Powdered silica
Gypsum
Talc
Zinc white
The softest rock is
Marble
Diamond
Talc
Quartz
Pug mill is used for
Preparation of clay
Moulding of clay
Drying of bricks
Burning of bricks
The specific gravity of marble, is
2.50
2.60
2.66
2.72
Sea sand used in structures causes
Dampness
Efflorescence
Disintegration
All of these
The most durable varnish is
Water varnish
Spirit varnish
Turpentine varnish
Oil varnish
The weight of 1 m3 of brick earth, is about
1200 kg
1500 kg
1800 kg
2000 kg
Pick up the correct statement from the following:
For thin structures subjected to wetting and drying, the water cement ratio should be 0.45
For mass concrete structures subjected to wetting and drying, the water ratio should be 0.55
For thin structures which remain continuously under water, the watercement ratio by weight should be 0.55
All the above
Most commonly used solvent in oil paints, is
Petroleum
Spirit
Coal tar
Turpentine
The steel used in R.C.C. work is
Stainless steel
Mild steel
High carbon steel
Wrought iron
Pick up the polymineralic rock from the following:
Quartz sand
Pure gypsum
Magnesite
Granite
The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is
Less than 1
Equal to 1
Greater than 1
Less than 1 in beams but greater than 1 in channels
Which of the following should be used for hearting of thicker walls?
Headers
Stretchers
Brick bats
Queen closer
Quartzite, a metamorphic stone is
Hard
Brittle
Crystalline
All the above
Which of the following is a rock?
Quartz
Mica
Gypsum
None of the above
Spalling hammer is used for
Driving wooden headed chisels
Rough dressing of stones
Carving of stones
Breaking small projection of stones
Linseed oil is used in paints as
Thinner
Vehicle
Base
Drier
Good quality sand is never obtained from
River
Lake
Sea
Gravel powder