Building Materials
A first class brick when immersed in cold water for 24 hours should not absorb water more than
- 15%
- 18%
- 20%
- 22%
The standard mortar mix for the bricks having compressive strength between 5 and 15 N/mm² is
- 1:3
- 1:4
- 1:6
- 1:5
Note :-
This Question is cancelled in Final Answer Key.
___________ is responsible for the grey color of cement.
- Iron oxide
- Calcium sulphate
- Alumina
- Magnesia
Low heat Portland cement shall not have an expansion of more than
- 15mm
- 10mm
- 20mm
- 17mm
The coarse sand has fineness modulus in the range of
- 2.2-2.4
- 2.4-2.6
- 2.6-2.9
- 2.9-3.2
Building Materials
The split tensile strength of M15 grade concrete when expressed as a percentage of its compressive strength is
- 10 to 15%
- 15 to 20%
- 20 to 25%
- 25 to 30%
The ideal range of the w/c ratio for the complete hydration of cement is
- 0.25 – 0.35
- 0.35 – 0.45
- 0.45 – 0.55
- 0.55 – 0.65
Organic matter in water for making concrete should not be more than
- 1,000 ppm
- 3,000 ppm
- 10,000 ppm
- 15,000 ppm
Note :-
This Question is cancelled in Final Answer Key.
Accelerator reduces __________ time and accelerate rate of hydration.
- Curing
- Hardening
- Strengthening
- Setting
The ratio of 28 days minimum compressive strength of mortar grade M1 to M2 is
- 3.0
- 0.67
- 1.5
- 0.33
Building Materials
Most of the stones possess the specific gravity in the range of
- 1.0 to 1.5
- 1.5 to 2.0
- 2.4 to 2.8
- 3.0 to 4.0
The crushing strength of a first class brick should not be less than
- 7.0 N/mm²
- 10.5 N/mm²
- 14.0 N/mm²
- 21.0 N/mm²
Which of the following timber defects is not evaluated quantitatively for units of defects?
- Rot
- Spiral Grain
- Pitch Pocket
- Curvature
Which of the following is a function of lime in brick manufacturing?
- it helps silica in clay to melt in the furnace
- it absorbs water and renders the clay plastic
- it gives colour to the brick
- it improves the brick’s impermeability
____________ is used for making railway sleepers
- Deodar wood
- Teak wood
- Maple wood
- Bamboo wood
Building Materials
With reference to paints, Barium Sulphate is the best
- vehicle
- pigment
- drier
- adultrant
The mass of the four Bogue’s compounds present in cement in descending order is
- C3S, C2S, C3A, C4AF
- C3S, C3A, C2S, C4AF
- C4AF, C3A, C2S, C3S
- C4AF, C3S, C3A, C2S
The Bureau of Indian Standards (BIS) has classified the common burnt clay bricks on the basis of
- compressive strength
- size of the brick
- water absorption capacity
- efflorescence on brick
A good building stone should have a wearing resistance less than
- 1.5%
- 3%
- 5%
- 7%
Statement 1 : Concretes cured at higher temperatures initially lead to lower early strengths.
Statement 2 : Curing is a process that facilitates (eases) hydration
- 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
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