Building Materials
As per IS 427: 2013, the maximum permissible limit for using lead in Distemper is
- 300 ppm
- 250 ppm
- 400 ppm
- 200 ppm
Timber can be made fire-resistant by
- dipping and steeping process
- Sir Abel’s process
- charring
- hot and cold open tank treatment
Which of the following factors does not result in increase of water demand in concrete mix design?
- Increased temperature
- Increased cement content
- Increased slump
- Increased proportion of the coarse aggregate to fine aggregate
Which of the following statement(s) is/are true for Sir Abel’s process?
i. It is a process employed to make timber fire resistant
ii. Dilute solution of sodium silicate is used
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Statement 1 : A slump cone measures 100 mm (top diameter), 200 mm (bottom diameter) and its height is 350 mm.
Statement 2 : The slump test helps in qualitatively understanding the setting time of concrete
- Both statements are True
- Both statements are False
- Statement 1 is True and Statement 2 is False
- Statement 1 is False and Statement 2 is True
Building Materials
What percentage of bound water by weight of cement is required for chemical reaction with Portland cement compounds ?
- 15%
- 23%
- 38%
- 40%
Which of the following stones can be used for ‘Rough Stone Work’?
- Granite
- Marble
- Chalk
- Laterite
The maximum bulking of sand is likely to occur at a moisture content of
- 5%
- 8%
- 11%
- 14%
The Fly ash which has calcium content of 15% to 35% is called as
- High Calcium Fly ash
- Low Calcium Fly ash
- Medium Calcium Fly ash
- Moderate Calcium Fly ash
A splitting tensile test is performed on a cylinder of diameter ‘D’ and length ‘L’. If the ultimate load is ‘P’, then the splitting tensile strength of concrete is given by
- P/Ï€DL
- 2P/Ï€DL
- 4PL/πD³
- 2PD/πL³
Building Materials
What are the functions of silica sand in the manufacturing of ceramic tiles?
(i) it increases shrinkage of fired body
(ii) it decreases unfired strength and plasticity
(iii) it facilitates the escape of gases during firing and drying
(iv) it gives plasticity to the mix
- (i) and (ii)
- (ii) and (iii)
- (iii) and (iv)
- (i) and (iv)
A good building stone should not absorb water more than
- 5%
- 10%
- 15%
- 20%
The process in which freshly fired bricks are dipped in water to prevent lime blowing is known as
- Docking
- Flashing
- Soaking
- Pugging
If P is the standard consistency of cement the amount of water used in conducting the initial setting time test on cement is
- 0.65P
- 0.85P
- 0.6P
- 0.8P
The ratio of Young’s modulus of high tensile steel to that of mild steel is about
- 0.5
- 1.0
- 1.5
- 2.0
Building Materials
Which of the following test is used to determine the rate of wearing of stones?
- crushing test
- abrasion test
- attrition test
- impact test
For a concrete-mix ratio of 1:2:4, the bulking of sand is 15%. If bulking correction is not applied to sand, then what would be the ratio of dry sand per unit volume of cement?
- 2
- 2.35
- 1.74
- Data insufficient
Normally the tensile strength of glass varies between
- 28 kg/cm² to 56 kg/cm²
- 280 kg/cm² to 560 kg/cm²
- 2800 kg/cm² to 5600 kg/cm²
- 28000 kg/cm² to 56000 kg/cm²
If the specific gravity and bulk density of a coarse aggregate is 2.5 and 1500 kg/m³, then the void content in the sample used for determining the bulk density would be
- 60%
- 50%
- 40%
- 30%
Maximum carbon content in high strength deform bars should not be more than
- 0.60%
- 0.06%
- 0.30%
- 0.03%
Click Here For All Building Materials GPSC PYQs
Click Here For All GPSC (Civil) PYQs Free MCQs
