Building Materials
Statement 1 : Quality control of concrete construction is usually based on strength tests carried out at an age of 28 days.
Statement 2 : Strength development in concrete is completed in about a month.
- 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
In dry process of cement manufacturing, a rotary kiln is charged at a temperature
- Less than 1200°C
- Between 1300°C and 1450°C
- Between 1500°C and 1800°C
- More than 1800°C
Blast furnace slag has approximately
- 45% calcium oxide and about 35% silica
- 50% alumina and 20% calcium oxide
- 25% magnesia and 15% silica
- 25% calcium sulphate and 15% alumina
The initial and final setting time of the Ordinary Portland Cement is
- Less than 30 minutes and Less than 600 minutes
- More than 30 minutes and More than 600 minutes
- More than 30 minutes and Less than 600 minutes
- Less than 30 minutes and More than 600 minutes
Which one of the following is not a function of geosynthetics?
i. Separation
ii. Reinforcement
iii. Filtration
- Only (i)
- (i) and (ii)
- (ii) and (iii)
- None
Building Materials
The size of group – I type coarse graded aggregate is
- 5 mm to 12.5 mm
- 12.5 mm to 20 mm
- 20 mm to 40 mm
- 40 mm to 60 mm
Based on the heat released upon hydration, arrange the following four compounds of the cement (1. C3S, 2. C2S, 3. C3A, 4. C4AF) in the descending order.
- 1, 2, 3, 4
- 3, 1 ,4, 2
- 3, 4, 1, 2
- 3, 4, 2, 1
The most commonly used retarder in cement is
- gypsum (calcium sulphate)
- calcium chloride
- calcium carbonate
- none of the above
Consider the following strengths of concrete :
- Cube strength
- Cylinder strength
- Split-tensile strength
- Modulus of rupture
The correct sequence in decreasing order of these strengths is
- 3, 4 , 2, 1
- 3, 4, 1, 2
- 4, 3, 2, 1
- 4, 3, 1, 2
Note :-
This Question is cancelled in Final Answer Key.
The age of trees can be understood by
- measuring the diameter of pitch
- the thickness of bark
- length of medullary rays
- counting the number of rings
Building Materials
Which of the following is not an example of thermoplastic ?
- polyethylene
- nylon
- PVC
- Bakelite
Lime stone is generally classified as a/an
- igneous rock
- sedimentary rock
- metamorphic rock
- silty rock
The age of the trees can be predicted by
- Length of medullary rays
- Counting the number of rings
- By measuring the diameter of pith
- By the thickness of bark
Which of the following statements are correct with reference to the effects of Fly Ash on cement concrete?
(i) It reduces the heat of hydration.
(ii) It slightly improves the resistance to sulphate attack.
(iii) It increases the permeability
- Only (i)
- (i) and (ii)
- (ii) and (iii)
- (i), (ii) and (iii)
If geotextiles are used as a reinforcement, then they should have
- Lower modulus of deformation
- Higher modulus of deformation
- Lower coefficient of friction
- Lower breaking strength
Building Materials
Which of the following is not an intrusive igneous rock ?
- granite
- gabbro
- diorite
- basalt
Gypsum consists of
(i) CaSO4 (ii) CaO (iii) H2O (iv) CO2
- (i) and (iii)
- (ii) and (iii)
- (i) and (iv)
- (ii) and (iv)
Match the following lists of type of Concrete Aggregates and their Surface Textures: (based upon a visual examination of hand specimens)
Type of Concrete Aggregates
(a) Black Flint
(b) Sandstone
(c) Chert
(d) Basalt
Surface Textures
1. Granular
2. Glassy
3. Smooth
4. Crystalline
- a – 1, b – 2, c – 3, d – 4
- a – 2, b – 1, c – 3, d – 4
- a – 1, b – 2, c – 4, d – 3
- a – 2, b – 1, c – 4, d – 3
Adequate amount of entrained air in concrete results in
i. better workability
ii. increased resistance to freezing and thawing
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
The length of time for which a concrete mixture will remain plastic is usually more dependent on
- the setting time of cement than on the amount of mixing water and atmospheric temperature
- the atmospheric temperature than on the amount of mixing water and setting time of cement
- the setting time of cement and the amount of mixing water than on atmospheric temperature
- the amount of mixing water used and the atmospheric temperature than on the setting time of cement.
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