Building Materials
The apparatus used for finding the setting time of cement is
- Vicat Apparatus
- Le-Chatelier Apparatus
- Blaine’s Apparatus
- Viscometer Apparatus
Aluminum is obtained from the ore called as
- Bauxite
- Ferrite
- Magnetite
- Calcite
The minimum compressive strength of first class bricks should be
- 5 N/mm²
- 7.5 N/mm²
- 10 N/mm²
- 12.5 N/mm²
The vehicle used in case of enamel paints is usually
- linseed oil
- water
- varnish
- spirit
Aerated concrete is produced by addition of
- copper sulphate
- aluminium powder
- sodium silicate
- zinc insulation
Building Materials
Ultimate strength to cement is provided by
- Tri-calcium silicate
- Di-calcium silicate
- Tri-calcium aluminate
- Tetra calcium alumino ferrite
In mild steel carbon percentage ranges in between
- 0.15 – 0.25%
- 0.25 – 0.35%
- 0.35 – 0.45%
- 0.45 – 0.55%
Before testing setting time of cement one should test for
- soundness
- strength
- fineness
- consistency
Poisson’s ratio for structural steel is _____________.
- 0.3
- 0.2
- 0.15
- 0.35
Durability of concrete is proportional to
- sand content
- water-cement ratio
- cement aggregate ratio
- aggregate water ratio
Building Materials
When the final coat of paint has not sufficient opacity, the background is clearly seen. This is known as
- Grinning
- Bloom
- Wrinkling
- Flaking
Smith’s Test is performed on stones to assess its _____________
- hardness
- specific gravity
- soluble and clayey matter
- insoluble matter
Main ingredients of Portland cement are
- Lime and Alumina
- Lime and Silica
- Silica and MgO
- Silica and Alumina
The lime is called as poor lime when % of clay is
- 0%
- < 30%
- > 30%
- > 70%
The ratio of compressive strength of fully saturated material to that of same material when dry is called
- Load factor
- Compaction factor
- Coefficient of hardness
- Coefficient of softening
Building Materials
French polish is made by dissolving the resin
- in oil
- in water
- in spirit
- in turpentine
Quick lime is a
- Carbonate of lime
- Product left immediately after the calcination of pure limestone
- Lime quickly treated with water
- None of the above
The percentage of alumina in a good brick earth should vary from
- 20% to 30%
- 30% to 40%
- 40% to 50%
- 50% to 60%
How old is a particular tree can be found out by knowing the status of
- Cambium layer
- Medullary rings
- Annual rings
- Bark of tree
Tensile strength of timber parallel to the fibres is in the range of
- 10 – 80 N/mm²
- 80 – 190 N/mm²
- 190 – 250 N/mm²
- 250 – 310 N/mm²
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