The rocks formed from molten magma, are called
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
Correct Answer :
B. Igneous rocks
Related Questions
Pick up the correct statement from the following:
Rust is due to formation of oxides
Cast iron oxidises less
Steel oxidises most
All the above
Pick up the correct statement from the following:
Steel produced by open hearth process is milder than that obtained by the Bessemer process
Engineers prefer open hearth steel for structural purpose as it is more homogenous
Basic Bessemer process is suitable for converting poor ore containing a large proportion of sulphur and phosphorus into steel
All the above
The tendency of a stone is, to split along:
Texture
Fracture
Cleavage
Structure
The stone suitable for rubble masonry should be.
Hard
Tough
Heavy
Light
For the manufacture of stainless steel, steel is mixed with
Chromium
Nickel
Tungsten
None of these
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
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 percentage of water for normal consistency, is
5% to 15%
10% to 25%
15% to 25%
20% to 30%
With storage, strength of cement
Increases
Decreases
Remains the same
None to these
A badly mixed cement concrete results in
Segregation
Bleeding
Honey combing
None of these
The rocks formed from molten magma, are called
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
Initial setting time of cement for asbestos cement products should be not less than
30 minutes
50 minutes
75 minutes
90 minutes
The low voltage porcelain is mainly used for
Switch block
Insulating tubes
Lamp sockets
All of these
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
The most valuable timber may be obtained from
Chir
Shishum
Sal
Teak
A bull nose brick is not used for
Rounding off sharp corners
Pillars
Decoration purpose
Arches
Porcelain is used as:
Sanitary wares
Electric insulators
Storage vessels
Reactor chambers
The foliated structure is very common in
Sedimentary rocks
Igneous rocks
Metamorphic rocks
None of these
Pick up the correct statement from the following:
Slaked lime contains calcium hydroxide
Quick lime contains calcium oxide
Slaked lime may be obtained from quick lime
All the above
Which of the following represents a metamorphic rock? (i) Slate (ii) Shale (iii) Quartzite The correct answer is
Only (iii)
Both (i) and (iii)
Both (ii) and (iii)
All (i), (ii) and (iii)
Blister steel
Is obtained by cementation process
Is full of fissures and cavities
Can be easily welded
All the above
Bitumen emulsion is
A liquid containing bitumen in suspension
A paint
Used as anti-corrosive paint
All the above
Mastic asphalt is generally used for
Damp proof course
Water proof layer
Partition walls
Both (A) and (B)
The preparation of surface of stone to obtain plain edges or to obtain stones of required size and shape is known as
Quarrying of stones
Blasting of stones
Seasoning of stones
Dressing of stones
Knots in timber are
Defects caused by crushing fibres
Splits radiating from the centre
Speckled strains
Signs of branches cut off
The usual percentages of clay and metal in cermet are:
50%, 50%
60%, 40%
70%, 30%
80%, 20%
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
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
Pig iron made from haematite ores free from sulphur, phosphorus and copper, is known as
Bessemer pig
Grey or foundry pig
White or forge pig
Mottled pig
A well seasoned timber may contain moisture up to
4 to 6 %
6 to 8 %
8 to 10 %
10 to 12 %