The hardest rock is
Marble
Diamond
Talc
Quartz
Correct Answer :
B. Diamond
Related Questions
Which of the following bricks are used for lining of furnaces?
Over-burnt bricks
Under-burnt bricks
Refractory bricks
First class bricks
A good brick earth should contain:
About 20% to 30% of alumina
About 50% to 60% of silica
Not more than 5% of lime
All the above
Distemper is
A paint consisting of powdered chalk, pigments and water
A water proofing agent
A paint consisting of coloured cement and water
A drying agent
Vanadium steel is generally used for
Railway switches and crossing
Bearing balls
Magnets
Axles and springs
The low voltage porcelain is mainly used for
Switch block
Insulating tubes
Lamp sockets
All of these
Pick up the correct statement from the following:
Solder material is an alloy which melts at a temperature above 400°C
Brazing is done at temperature above 600°C to 1100°C
Brazing joint is stronger than the solder joint
All the above
The base material for distemper, is
Chalk
Lime
Lime putty
Cement wash
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
All of the above
The trunk of tree left after cutting all the branches is known as
Log
Batten
Plank
Baulk
The stones obtained by blasting are used as
Ballast in railways
Aggregates for concrete
Road metal
All the above
The most commonly used retarder in cement is
Gypsum
Calcium chloride
Calcium carbonate
None of the above
For a good building stone, its specific gravity should the greater than
1.5
1.7
2.2
2.7
The type of bond provided in brick masonry for carrying heavy loads is
Single Flemish bond
Double Flemish bond
English bond
Zigzag bond
Crushing strength of a first class brick should not be less than
3.5 N/mm²
7.0 N/mm²
10.5 N/mm²
14.0 N/mm²
The most durable varnish is
Water varnish
Spirit varnish
Turpentine varnish
Oil varnish
To retard the initial setting time of cement, the compound responsible, is
Tri-calcium silicate
Gypsum
Di-calcium silicate
Tri-calcium aluminate
Which of the following stresses is used for identifying the quality of structural steel?
Ultimate stress
Yield stress
Proof stress
None of the above
Duco is one of the patent forms of
Emulsion paints
Plastic paints
Bituminous paints
Cellulose paints
The rock generally used for roofing, is
Granite
Basalt
Slate
Pumice
Pick up the polymineralic rock from the following:
Quartz sand
Pure gypsum
Magnesite
Granite
Plastics are compounds of carbon with element
Hydrogen
Nitrogen
Oxygen
All of these
Age of a tree may be ascertained by
Radius of its stem
Circumference of its stem
Number of branches
Number of annual rings
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
Index number expressing the relative sizes of both coarse and fine aggregates, is called
Proportioning of aggregates
Fineness modulus
Grading of aggregates
None of these
With storage, strength of cement
Increases
Decreases
Remains the same
None to these
Shingle is
Decomposed laterite
Crushed granite
Water bound pebbles
Air weathered rock
The yield strength and tensile strength of low carbon steel may be improved by the addition of
Manganese
Chromium
Nickel
Vanadium
Percentage content of silica in window glass, is
40 to 45
50 to 55
60 to 65
70 to 75
The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as
Cementation process
Crucible process
Bessemer process
Open hearth process
Spalling hammer is used for
Driving wooden headed chisels
Rough dressing of stones
Carving of stones
Breaking small projection of stones