Building Materials
Match the following lists:
Non-destructive test
a. Radio activity test
b. Magnetic methods
c. Neutron activation analysis
d. Neutron scattering test
Purpose of test
1. to determine moisture content of concrete
2. to measure depth of reinforcement cover
3. to measure density and thickness of concrete
4. to determine cement content
- a – 3, b – 2, c – 4, d – 1
- a – 2, b – 1, c – 3, d – 4
- a – 1, b – 2, c – 4, d – 3
- a – 2, b – 1, c – 4, d – 3
Test carried out to determine tensile strength of concrete is called
- split test or Brazilian test
- Vee-Bee test
- triaxial loading test
- compression test
Match the following lists of Ingredients of bricks and the properties they impart in the bricks:
Ingredients
a. Alumina
b. Lime
c. Silica
d. Ferric Oxide
Properties
1. renders the clay plastic
2. lowers the fusing point in carbonated form
3. prevents the shrinking and warping
4. improves the impermeability
- 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
Compare the concreting conditions with required workability.
1. Mass Concrete
2. Pavements
3. Heavily reinforced concrete
4. In situ piling
a. High
b. Medium
c. Low
d. Very low
- 1 – a, 2 – b, 3 – c, 4 – d
- 1 – b, 2 – a, 3 – d, 4 – c
- 1 – c, 2 – d, 3 – b, 4 – a
- 1 – d, 2 – c, 3 – a, 4 – b
The Central part of tree is called
- Heart Wood
- Pith
- Sap Wood
- Cambium Layer
Building Materials
Which of the following types of iron is the most suitable one for making columns, base plates and door brackets?
- Pig iron
- Cast iron
- Wrought iron
- Malleable iron
In Cylinder Splitting Tension test, if P is compressive load on the cylinder of length L and diameter D, expression for split tensile strength is
- P/(Ï€LD)
- P/(2Ï€LD)
- 2P/(Ï€LD)
- P/(4Ï€LD)
Bouge’s compound responsible for flash set is
- Tricalcium Silicate
- Dicalcium Silicate
- Tricalcium Aluminate
- Tetracalcium Aluminoferrite
Which one of the following classes of lime shall not be supplied as a quick lime?
- Class A
- Class B
- Class C
- Class D
Excess of silica makes brick
- brittle on burning
- to melt on burning
- to crack on drying
- to warp
Building Materials
The lime which contains mainly calcium oxide and slacks with water is
- fat lime
- quick lime
- hydraulic lime
- poor lime
Which of the following is used for varnishing maps and pictures?
- Spirit varnish
- Water varnish
- Spar varnish
- Oil varnish
A simple field test carried out to determine deterioration of stones when immersed in water is known as
- Absorption test
- Moh’s hardness test
- toughness test
- Smith’s test
The grade of concrete corresponding to nominal mix proportions of 1:3:6 is
- M-35
- M-25
- M-15
- M-10
For the same moisture content, bulking of sand is highest in
- Sand with fine grading
- Sand with medium grading
- Sand with coarse grading
- Gravelly sand
Building Materials
According to IS: 1121(Part-3) – 2012, the split tensile strength (in N/mm²) of test specimen of stones is given by (all symbols have their usual mean)
- W/Ï€dL
- 2W/Ï€dL
- 2W/dL
- 5W/Ï€dL
Match the correct ones for various types of mortars:
1. Lime-pozzolana mixture mortar
2. Lime Mortar
3. Cement Mortar
4. Cement -lime Mortar
a. Should be used within 0.5 hours of mixing
b. Should be used within 2 hours of mixing
c. Should be used within 4 hrs to 12 hrs of mixing
d. Should be used within 4 hrs to 24 hrs of mixing
- 1 – a, 2 – b, 3 – c, 4 – d
- 1 – d, 2 – c, 3 – a, 4 – b
- 1 – c, 2 – d, 3 – b, 4 – a
- 1 – b, 2 – a, 3 – d, 4 – c
Which of the following is not a test for measuring the workability of concrete?
- Slump test
- Flow test
- Le Chatelier’s Test
- Compaction factor test
The apparatus used for measuring soundness of cement is
- Vicat’s apparatus
- Le Chatelier’s apparatus
- Briquette apparatus
- Lechate apparatus
The total percentage of dicalcicum silicate and tricalcium silicate in all types of Portland cement is around
- 50%
- 60%
- 70%
- 90%
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