Building Materials
What causes bulking of sand?
- Surface moisture
- Clay content
- Air voids
- Viscosity
The workability of concrete is assessed through:
1. Slump test
2. Compaction factor test
3. Air-content method
4. Le-Chatelier’s apparatus Out of these, which one is correct?
- 1
- 2
- 1 and 2
- 1 and 4
Which of the following is/are correct with reference to Piezoelectric materials?
i. When a piezoelectric material is deformed, it gives off a small but measurable electrical discharge.
ii. When an electrical current is passed through a piezoelectric material it experiences increase in size.
- Only (i)
- Only (ii)
- Both (i) & (ii)
- Neither (i) nor (ii)
Which of the following statement(s) is/are true for assessing the compressive strength of brick?
(i) Bricks shall be immersed in water for 24 hours
(ii) Brick is tested for compressive strength by placing it between plates and applying load of 100 MPa per minute till failure occurs.
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Which compound of cement is responsible for the strength of cement?
- Silica
- Magnesium Oxide
- Calcium sulphate
- Alumina
Building Materials
The blast furnace slag is considered as an alternative cementitious material because of the presence of
- Silica dioxides
- Aluminium oxide
- Calcium oxides
- Magnesium oxides
The impurity in glass which gives the edge of glass sheet a greenish colour is
- Silica
- Cobalt Oxide
- Iron
- Iron Oxide
Which of the following statements is incorrect for compressive strength of cement mortars?
- Ordinary Portland Cement: Required Strength at 72 hours is not less than 16 MPa
- Portland Slag Cement: Required Strength at 72 hours is not less than 16 MPa
- Portland Pozzolana cement (Fly ash based): Required Strength at 72 hours is not less than 16 MPa
- Rapid hardening Portland cement: Required Strength at 72 hours is not less than 16 MPa
Which of the following can be done for increasing the workability of concrete?
(i) alter the proportion of fine sand and coarse sand
(ii) decrease the quantity of water
(iii) use angular aggregates
- Only (i)
- (i) and (ii)
- (ii) and (iii)
- (i), (ii) and (iii)
Which of the following statement(s) is/are true for Guniting?
(i) It is a damp-proofing technique that uses pressure to apply a thick cement mortar layer to exposed walls and pipe surfaces.
(ii) Typically, 1:3 cement-to-sand mortar is utilised for this purpose
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Building Materials
As per IS code specifications for methods of sampling and analysis of concrete, the minimum volume of the composite sample of the fresh concrete, truly representing the batch, to be collected from the field for investigation is
- 0.005 m³
- 0.010 m³
- 0.015 m³
- 0.020 m³
Which of the following processes of Brick manufacturing is carried out at pug mills to ensure homogeneity in the mass of clay for subsequent processing?
- Weathering
- Blending
- Tempering
- Drying
Which of the following statements are true for crushed sand to be used for making concrete?
(i) Crushed rock sand has surfaced as a viable alternative to natural river sand and is now being used commonly throughout the world as fine aggregate in concrete
(ii) The angular grain or flaky particles produced by poor crushing may necessitate more water and cement, rendering it unsuitable for concrete production.
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
For marine works, the best suited cement is _____________ & minimum grade of concrete as per IS 456:2000 for RC structure _______________
- Low heat Portland cement, 40
- Sulphate resisting cement, 30
- Ordinary Portland cement, 20
- Portland pozzolana cement, 25
Which of the following is a correct combination for the concrete mix vs mix design mentioned in column A and B respectively?
COLUMN A
a. M10
b. M20
c. M15
d. M25
COLUMN B
1. 1:1:2
2. 1:2:4
3. 1:1.5:3
4. 1:3:6
- a – 4, b – 2, c – 1, d – 3
- a – 4, b – 1, c – 2, d – 3
- a – 4, b – 3, c – 2, d – 1
- a – 2, b – 3, c – 4, d – 1
Building Materials
Which of the following component of the Oil Paint bring down its overall cost, reduce the weight and increase the durability?
- Vehicles
- Solvents
- Driers
- Adultrants
Which of the following ingredients of cement when added in excess quantity causes the cement to set slowly?
- Lime
- Silica
- Alumina
- Iron Oxide
Vicat’s apparatus is used to measure
- Soundness of cement
- Consistency of cement
- Fineness of cement
- Shrinkage of cement
According to IS 456-2000, what is the permissible limits for the construction of suspended matter in water?
- 2000 mg/l
- 200 mg/l
- 400 mg/l
- 3000 mg/l
Dosage of superplasticizer in concrete shall be restricted to _% by weight of cementitious material as per IS:456-2000 is
- 0.5
- 1.0
- 1.5
- 2.0
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