Good quality stones must
Be durable
Be free from clay
Resist action of acids
All the above
Correct Answer :
D. All the above
Related Questions
Study the following statements. (i) Hydraulic lime is suitable for white washing, (ii) Fat lime is suitable for whitewashing, (iii) Hydraulic lime is suitable for making mortar, (iv) Fat lime is suitable for making mortar. The correct answer is
(i) and (iv)
(ii) and (iii)
(i) and (ii)
(iii) and (iv)
The specific gravity of marble, is
2.50
2.60
2.66
2.72
The main function of alumina in brick earth is
To impart plasticity
To make the brick durable
To prevent shrinkage
To make the brick impermeable
Sea sand used in structures causes
Dampness
Efflorescence
Disintegration
All of these
The main constituent of fly-ash, is
Aluminium oxide
Silica
Ferrous oxide
All of these
Assertion A : Normally turpentine oil is recommended as thinner for indoor painting. Reason R : Turpentine oil is costlier than other thinners. Select your answer according to the coding system given below:
Both A and R is true and R is the correct explanation of A
Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
The usual percentages of clay and metal in cermet are:
50%, 50%
60%, 40%
70%, 30%
80%, 20%
Dextrin is
Animal glue
Starch glue
Albumin glue
Rubber based adhesive
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
Advantage of a clamp compared to a kiln for burning bricks is that
It takes less time for burning
It gives more output of first class bricks
It has less initial cost
It is suitable when bricks are required in large numbers
For melting one tonne of cast iron
700 m3 air is required
20 kg limestone is required
One quintal coke is required
All the above
Wrought iron contains carbon about
1.5% to 5.5%
0.5% to 1.75%
0.1% to 0.25%
None to these
The steel which contains fissures and cavities, is manufactured by
Cementation process
Crucible process
Bessemer process
Open hearth process
The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to
Grey cast iron
White cast iron
Mottled cast iron
Toughed cast iron
With storage, strength of cement
Increases
Decreases
Remains the same
None to 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
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
The initial setting time of lime-pozzolana, is
30 minutes
60 minutes
90 minutes
120 minutes
Pick up the incorrect statement from the following:
Hydraulic lime is generally obtained by burning kankar
Hydraulic lime sets slowly as compared to fat lime
Hydraulic lime is generally used in lime mortar
None of these
The plastics prepared from Vinyl resin are
Odourless
Non-toxic
Transparent
All of these
Excess of alumina in brick earth makes the brick
Impermeable
Brittle and weak
To lose cohesion
To crack and warp on drying
Pick up the compound responsible for early strength of cement from the following:
Tetra-calcium alumino-ferrite
Tri-calcium silicate
Tri-calcium aluminate
Di-calcium silicate
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
Wrought iron is manufactured from pig iron by
Refining
Pudding
Shingling
All the above
Pick up the polymineralic rock from the following:
Quartz sand
Pure gypsum
Magnesite
Granite
Water paint is a
White wash
Colour wash
Whiting
All the above
The filler used in plastic bitumen, is
Shale powder
Talc powder
Asbestos powder
Plastic powder
The most important constituent of an oil paint, is
Thinner
Vehicle
Pigment
All the above
Blister steel
Is obtained by cementation process
Is full of fissures and cavities
Can be easily welded
All the above
Brittleness of cold is due to an excess of
Sulphur
Carbon
Phosphorus
Silicon