Building Materials (GPSC Civil PYQs) Free MCQs 20

Building Materials

What will be the bulk volume of one bag of Portland Cement of 50 kgs?

• 35 lit
• 45 lit
• 55 lit
• 65 lit

Sand with a fineness modulus of 3.2 will be categorized as

• Fine Sand
• Medium Sand
• Coarse Sand
• None of the above

Which of the following statement(s) is/are false?

(i) Acid Refractory Bricks can be used for lining of furnaces which have to be cooled and reheated frequently

(ii) Basic Refractory Bricks have poor resistance to spalling

• Only (i)
• Only (ii)
• Both (i) and (ii)
• Neither (i) nor (ii)

The strength of timber is maximum when load applied is

• parallel to grain
• perpendicular to grain
• inclined at 45° to grain
• inclined at 60° to grain

What is the permissible proportion of fly-ash, as replacement to cement in concrete?

• 85%
• 65%
• 45%
• 25%

Building Materials

Which of the following is a correct combination for the concrete tests vs mechanical properties to be determined as mentioned below?

Concrete Test

a. Cube Test

b. Cylinder test

c. Split cylinder test

d. Beam test

Mechanical Property

1. Modulus of elasticity

2. Compressive strength

3. Shear strength

4. Tensile strength

• a-4, b-2, c-1, d-3
• a-2, b-1, c-4, d-3
• a-4, b-3, c-2, d-1
• a-2, b-3, c-4, d-1

To retard the initial setting time of cement, the compound responsible is

• Tricalcium Silicate
• Gypsum
• Dicalcium Silicate
• Tricalcium Aluminate

Plastic shrinkage in concrete is caused due to

• Loss of water by evaporation from the surface of concrete
• Water absorption by aggregate or subgrade
• Both (A) and (B)
• None of the above

Which of the following is not an ingredient of the Epoxy Mortar?

• Resin
• Hardener
• Silica sand
• Cement

The device used to determine normal consistency of cement is

• Kelly Ball
• Le-Chatelier apparatus
• Vicat apparatus
• Slump cone apparatus

Building Materials

In Vicat’s apparatus the diameter of the plunger used is

• 5 mm
• 10 mm
• 15 mm
• 20 mm

Which of the following statements is / are correct for limes used in construction?

i. Hydraulic lime is used for structural purpose

ii. Fat lime is used for white washing and plastering and composite mortars (with pozzolanic material)

iii. Siliceous dolomitic lime is used for under coat and finishing coats of plasters

• Only (i)
• (i) and (ii)
• (ii) and (iii)
• (i), (ii) and (iii)

Match the Mix Design and its application

• A – 1, B – 2, C – 3, D – 4
• A – 2, B – 4, C – 3, D – 1
• A – 4, B – 2, C – 1, D – 3
• A – 3, B – 4, C – 1, D – 2

Corundum is used as

• a binding material
• an adhesive material
• a reinforcing material
• an abrasive material

Which of the following tests is used for measuring workability of self compacting concrete?

• J ring test
• Slump test
• Compaction factor test
• V bee test

Building Materials

Which of the following is more sustainable cement?

• Ordinary Portland cement
• Rapid hardening cement
• Cement in combination with fly ash
• Cement in combination with fly ash and blast furnace slag

Which of the following is / are requirement(s) of good brick earth?

(i) It should be free from lumps of lime

(ii) It should contain organic matter

(iii) It should be non-homogeneous

• Only (i)
• (i) and (ii)
• (ii) and (iii)
• (i), (ii) and (iii)

Which of the following Precasting methods is the most suitable one for manufacturing exterior wall panels where special finishes are required on one face or for sandwich panel?

• Individual mould method
• Battery form method
• Tilting mould method
• Extrusion method

What is the correct sequence of steps to be performed on a specimen of high strength deformed steel bar for Rebend Test?

i. kept in boiling water at 100°C for 30 minutes

ii. bent at an included angle of 157½°

iii. bent at an included angle of 135°

iv. allowed to get cool down

• (i) – (iv) – (iii) – (ii)
• (i) – (iv) – (ii) – (iii)
• (iii) – (i) – (iv) – (ii)
• (ii) – (i) – (iv) – (iii)

Workability of the concrete is assessed through which of the following tests?

(i) Slump test

(ii) Flow test

(iii) Compaction Factor test

• Only (i)
• (i) and (ii)
• (ii) and (iii)
• (i), (ii) and (iii)

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