Test VLXD P01

Question 1: Dense degree is a ratio of …………. and unit is (%)

• a) Bulk density/ specific density

• b) Dense volume/ porous volume

• c) Normal volume/ dense volume

• d) Dense volume/ normal volume

Question 2: Quality of lime is determined by factors as:

• a) Quantity, temperature of lime reaction, lime yield

• b) Temperature and rate of lime reaction, reactivity of lime, lime yield, content of unripe lime.

• c) Rate of lime reaction, content of unripe lime, reactivity of lime.

• d) a and c are right

Question 3: Major raw material to produce hydraulic lime is ….in which clay content is ...…%

• a) CaCO₃; 6-20%

•     b) CaCO₃, MgCO₃;>20%

• c) CaCO₃; <6%

• d) CaSO₄; >6%

Question 4: In Asphalt, redundant porous is a total ……of fine pores presenting in bitumen layer which covers aggregates of an asphalt mixture ........being compacted. The unit of the redundant porous is % by volume of asphalt mixture.

• a) volume – after

• b) content – after

• c) volume – before

• d) content – before

Question 5: the finess of cement is …..

• a) inversely proportional to water requirement content;

• b) inversely proportional to rate of setting and hardening;

• c) inversely proportional to strength of cement;

• d) directly proportional to specific surface area of cement (cm²/g).

Question 6: Steel bar used in construction is ……..carbon steel, carbon content is not over.........

• a) moderate – 0.28%

• b) low – 0.22%

• c) low – 0.28%

• d) moderate – 0.22%

Calculate bulk density of Asphalt as we know that bitumen specific density is 1.05g/cm³, mineral aggregate has bulk density of 1.85kg/lit and porous degree of 18.6% by volume. We assume that redundant porous degree of Asphalt is 4.5% by volume and bitume only fills voids arranging among mineral aggregate particles.

• a) 1998 kg/m³

• b) 1800 kg/m³

• c) 1880 kg/m³

• d) 2002 kg/m³

Question 8: Construction gypsum is a binder hardening in ….., and chemical formulation is:…….

• a) Water, CaSO₄.0.5H₂O

• b) Air, CaSO₄.0.5H₂O

• c) Air, CaSO₄.2H₂O

• d) Water, CaSO₄.2H₂O

Question 9: With Portland cement, major mineral compound determining compressive strength of hardened cement is:

• a) C₃A

• b) C₂S

• c) C₄AF

• d) C₃S

Question 10: Basing on rock origin, natural rocks are classified as:

• a) Igneous rock, intrusive rock, contact rock;        

• b) Igneous rock, sedimentary rock, metamorphism rock;

• c) Intrusive rock, sedimentary rock, metamorphism rock;

• d) Intrusive rock, extrusive rock, sedimentary rock.