Building Materials
Arrange the walling technology in decreasing order of their thermal conductivity
a. Brick & mortar cavity wall – 250 mm thick
b. Precast concrete wall – 150 mm thick
c. Hollow brick wall – 200 mm thick
d. Bamboo mud composite wall – 50 mm thick
- a > b > c > d
- b > a > c > d
- b > a > d > c
- a > b > d > c
Which of the admixture will result in porous concrete?
- Plasticizers
- Air entraining agent
- Viscosity modifiers
- None of the above
The equivalent cube strength of the concrete is determined by multiplying the corrected cylinder strength by
- 3/4
- 4/5
- 4/3
- 5/4
The laboratory slump test result of the fresh concrete is between 25 mm and 30 mm, the degree of workability of such concrete is
- Very Low
- Low
- Medium
- High
Which of the following statement(s) is/are true for Mohs scale?
(i) It is used for stones to determine their hardness
(ii) It varies from 1 to 5
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Building Materials
Which of the following stones is best suited for an ornamental work?
- Marble
- Chalk
- Granite
- Laterite
Acrylic is the name of
- Cellulose resin
- Alkyd resin
- Methyl methacrylate
- Coumarone indene
The property described by the word ‘Intumescent’ in Intumescent Painting is
- Swelling
- Efflorescence
- Ductility
- Workability
Which of the following statements is correct for the selection of sand for masonry mortars?
i. In natural sand, clay, fine silt and fine dust should be not more than 5% by mass
ii. In crushed stone sand, clay, fine silt and fine dust should be not more than 5% by mass
iii. Various sizes of particles of sand should be uniformly distributed throughout the mass
- Only (i)
- (i) and (ii)
- (ii) and (iii)
- (i), (ii) and (iii)
Which of the following statement(s) is/are true?
(i) the size of the mould for testing the compressive strength of concrete is 70.6 mm
(ii) the size of the mould for testing the compressive strength of cement is 150 mm
- Only (i)
- Only (ii)
- Both (i) and (ii)
- Neither (i) nor (ii)
Building Materials
Granite is an example of
- Metamorphic rocks
- Aqueous rocks
- Igneous rocks
- Sedimentary rocks
As per IS Code of Practice, concrete should be cured at
- 10°C
- 15°C
- 27°C
- 41°C
Soundness test of cement is carried out to determine
- free lime content
- durability under sea water
- alumina content
- iron oxide content
Which of the following is a correct combination for admixture and its purpose as mentioned below?
Type of Admixture
a. Plasticizer
b. Air Entertainer
c. Viscosity Modifier
d. Accelerator
Purpose
1. Rapid setting concrete
2. High strength concrete
3. Light weight concrete
4. Self-compacting concrete
- a – 2, b – 3, c – 4, d – 1
- a – 4, b – 3, c – 2, d – 1
- a – 2, b – 1, c – 4, d – 3
- a – 2, b – 3, c – 4, d – 1
Note :-
This Question is cancelled in Final Answer Key.
Which of the following is primarily used to determine the fineness of cement?
- Vicat apparatus
- Le-chatelier apparatus
- Autoclave test
- None of the above
Building Materials
An aggregate is said to be flaky, if its least dimension is less than _______________ of its mean dimension
- 2/3
- 3/4
- 3/5
- 5/8
The maximum particle size of fine aggregate is
- 4.75 mm
- 2.5 mm
- 2.36 mm
- 10 mm
Hydration of which of the following compound(s) will result in the increase of strength of the concrete after 28 days?
i. Di-calcium Silicate
ii. Tri-calcium Silicate
iii. Tri-calcium Aluminate
iv. Tetra-calcium Aluminoferrite
- Only (i)
- (i) and (ii)
- (i) and (iii)
- (iii) and (iv)
Which of the following statements is correct with respect to strengths of Concrete and Steel?
- Concrete is weak in tension and strong in compression, while Steel is weak in compression and strong in tension.
- Concrete is weak in compression and strong in tension, while Steel is weak in tension and strong in compression.
- Concrete is weak in tension and strong in compression, while Steel is strong in both tension and compression.
- Concrete and Steel both are weak in tension and strong in compression
A mortar for which both cement and lime are mixed is called
- lime mortar
- gauged mortar
- cement mortar
- light weight mortar
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