Building Materials (GPSC Civil PYQs) Free MCQs 7

Building Materials

Which of the following is not an objective of seasoning the timber?

• Reduction of the weight of the timber
• Rectifying the natural defects in the timber
• Increase in the strength and durability of the timber
• Reduction in the shrinkage and warping of the timber

Correct match of Column I (types of rocks) with Column II (method of formation) and Column III (example of rock) is

• PMX, QLY, RNZ
• PNY, QMZ, RLX
• PMY, QNX, RLZ
• PLZ, QNY, RMX

As per IS 456:2000, the pH of water used for mixing and curing shall not be less than

• 5.5
• 6.0
• 6.5
• 7.0

Correct match of Column I (types of cement) with Column II (properties or preparation) is

• P-4, Q-1, R-2, S-3
• P-1, Q-4, R-2, S-3
• P-3, Q-1, R-4, S-2
• P-2, Q-1, R-4, S-3

The main advantage of adding pozzolanas in cement is

• longer life
• reduced cost and permeability of concrete
• slower setting time
• faster setting time

Building Materials

Correct match of Column I (types of bricks) with Column II (properties or use) is

• P-4, Q-1, R-2, S-3
• P-1, Q-4, R-2, S-3
• P-3, Q-1, R-4, S-2
• P-2, Q-1, R-4, S-3

The split tensile strength of M 15 grade concrete when expressed as percentage of its compressive strength is

• 10-15%
• 15-20%
• 20-25%
• 25-30%

Poisson’s ratio for concrete generally varies between

• 0.05 – 0.15
• 0.15 – 0.25
• 0.25 – 0.50
• 0.50 – 0.80

Carbon fibres used primarily in construction material have fibres of diameter in range of

• 0.2 to 0.4 micrometer
• 0.5 to 0.6 micrometer
• 2 to 4 micrometer
• 5 to 6.5 micrometer

Detachment of paint film from the surface is known as

• flaking
• chalking
• blooming
• grinning

Building Materials

Self-healing concrete is a product

• that will be self compacting after casting
• that will biologically produce limestone to heal cracks that appear on the surface of concrete structures
• that will conserve the moisture to prevent shrinkage cracks
• that will provide ductility to concrete when subjected to tension

Which of the following is not an objective of seasoning timber?

• Reduction in shrinkage and warping
• Reduction of weight
• Increase in strength and durability
• Reduction of natural defects in timber

Which of the following concrete has ability to heal its crack?

• High Performance Concrete
• Bacterial Concrete
• Shotcrete
• Self-Compacting Concrete

The dimension of modular bricks when tested in accordance with IS: 1077 – 1992, the maximum tolerance in length of brick is limited per 20 bricks as

• ± 10 mm
• ± 40 mm
• ± 60 mm
• ± 80 mm

The Aggregate Impact value of the aggregate used for ______________

• Concrete for ordinary use should not be more than 45 %.
• Road Pavements Concrete is less than 30 %.
• Runway Concrete is less than 30 %.
• All the options are correct

Building Materials

The device used to determine normal consistency of cement is

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

Which one of the following durability testsfor stonesis prescribed by Bureau ofIndian Standards?

• Smith Test
• Brard’s Test
• Crystallisation Test
• Acid Test

Which of the following is / are considered as Green Building material(s) ?

• Flyash bricks
• AAC blocks
• Bamboo
• All of the above

Excess of alumina in the clay

• Makes the brick brittle and weak
• Makes the brick wrap and crack on drying and burning
• Changes the colour of the brick from red to yellow
• Improves impermeability and durability of the brick

Which one of the following statements is incorrect?

• Using mortar pan for transporting concrete in drying conditions has the disadvantage that it exposes greater surface area of concrete and results in greater loss of water.
• Ramming should not be permitted in case of upper floor construction.
• Compaction by pressure and jolting is ineffective method for compacting very dry concrete.
• Compaction by spinning is adopted for fabrication of concrete pipes.

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