Building Materials
Tensile strength of Kevlar-29 fibre used in FRP is
- 2860 mpa
- 3860 mpa
- 4860 mpa
- 5860 mpa
- Polyvinyl chloride (PVC) is a
- thermosetting material
- thermoplastic material
- elastoplastic material
- rigid – plastic material
The weight of glass sheet used for panel should be
- < 7.5 kg/m²
- > 7.5 kg/m²
- < 10.5 kg/m²
- > 10.5 kg/m²
Soundness of cement is tested by
- Vicat’s Apparatus
- Compressive strength Testing Apparatus
- Le Chatelier Apparatus
- None of the above
Following is not the process involved in the fabrication of articles of plastic
- Laminating
- Blowing
- Calendering
- Tempering
Building Materials
Soundness of cement means _______________.
- Passing of sound waves through concrete
- Minimum volume change after setting
- Heat insulation
- Early strength gain
Air entrainment Portland Cement
(i) offers great resistance to sulphate attack
(ii) offers great resistance to freezing and thawing
(iii) reduces the possibility of shrinkage and crack formation in the concrete surface
(iv) is suitable for mass concreting
- Only (i)
- (i) and (ii)
- (i), (ii) and (iii)
- (i), (ii), (iii) and (iv)
The bricks which are extensively used for basic refractories in furnaces are
- Chrome bricks
- Sillimanite bricks
- Magnesite bricks
- Fosterite bricks
The cyclopan aggregate has a size more than
- 4.75 mm
- 25 mm
- 45 mm
- 75 mm
In a good brick earth used for making good quality bricks, percentage of silica lies
- 10 – 20%
- 20 – 30%
- 30 – 40%
- 50 – 60%
Building Materials
Compaction factor of 0.855 indicates a mix of
- Low workability
- High workability
- Very low workability
- Medium workability
Spalling hammer is used for
- driving wooden headed chiesel
- carving of stones
- rough dressing of stones
- breaking small projection of stones
Which of the following pairs of cement test and equipment used in that test is not correctly matched ?
- Soundness test – Le Chatelier’s apparatus
- Fineness test – Le Chatelier’s apparatus
- Consistency test – Vicat’s Apparatus
- Setting time test – Vicat’s Apparatus
As per BIS 1077-1957, the minimum crushing strength of bricks should be
- > 2.5 mpa
- > 3.5 mpa
- > 4.5 mpa
- > 5.5 mpa
The expansion in Portland cement can be tested by
- fineness test
- soundness test
- setting time test
- normal consistency test
Building Materials
The chemical formula of plaster of paris is
- Caâ‚‚O
- CaSOâ‚„
- P₂O₃
- CaSOâ‚„SiOâ‚‚
The percentage of chromium and nickel in stainless steel respectively are
- 18% and 8%
- 8% and 18%
- 12% and 3%
- 36% and 12%
Aerated concrete is produced by addition of
- copper sulphate
- aluminum powder
- sodium silicate
- zinc silicate
Which one of the following types of steels is used in the manufacture of rails?
- mild steel
- manganese steel
- cast steel
- bessemer steel
Efflorescence is due to the presence of
- excessive soluble salts in the mortar
- rust in the reinforcing steel
- cracks in the masonry
- stagnating water
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