Materials — Quiz 2

Questions in this quiz (12)

1. A sieve analysis of fine aggregate yields the following cumulative percent retained on standard sieves (3/8", No.4, No.8, No.16, No.30, No.50, No.100): 0%, 5%, 18%, 36%, 55%, 75%, 92%. Calculate the fineness modulus of the aggregate.

   • 2.65
   • 2.81
   • 3.12
   • 3.48

2. A steel specimen is subjected to a tensile test. At a stress of 200 MPa, the corresponding strain is measured as 0.0010. Calculate the modulus of elasticity of the steel.

   • 160 GPa
   • 180 GPa
   • 200 GPa
   • 220 GPa

3. An asphalt mixture sample weighs 1,500 g in total, and after extraction testing the asphalt binder weight is determined to be 90 g. What is the asphalt content by total weight of the mix?

   • 5.0%
   • 6.0%
   • 6.5%
   • 7.0%

4. During a tensile test of a metal specimen within the elastic region, a force of 100 kN produces an elongation of 2.0 mm. Assuming linear elastic behavior, determine the work done on the specimen.

   • 80 J
   • 100 J
   • 120 J
   • 150 J

5. A steel bar with a modulus of elasticity of 210,000 MPa is subjected to a tensile stress of 140 MPa within the elastic range. Calculate the strain energy per unit volume stored in the bar.

   • 46.7 kJ/m³
   • 52.5 kJ/m³
   • 65.3 kJ/m³
   • 80.0 kJ/m³

6. A concrete batch contains 320 kg of cement, 160 kg of water, 700 kg of fine aggregate, and 1,050 kg of coarse aggregate. If the unit weight of fresh concrete is 2,350 kg/m³, what is the yield of this batch?

   • 0.905 m³
   • 0.950 m³
   • 0.982 m³
   • 1.020 m³

7. A ductile metal specimen with an original gauge length of 60 mm is tested in tension until fracture. The final gauge length at fracture is 72 mm. Calculate the percent elongation of the specimen.

   • 15%
   • 18%
   • 20%
   • 25%

8. A hydraulic testing machine applies a constant force of 30 kN to a specimen moving at a constant velocity of 0.015 m/s. Calculate the power required to perform this test.

   • 300 W
   • 350 W
   • 450 W
   • 500 W

9. In the absolute volume method for concrete mix design, calculate the volume occupied by 350 kg of cement. Assume the specific gravity of cement is 3.15 and the density of water is 1,000 kg/m³.

   • 0.111 m³
   • 0.127 m³
   • 0.141 m³
   • 0.350 m³

10. A Marshall stability test on an asphalt mixture specimen yields a stability value of 14.0 kN and a flow value of 3.5 mm. Calculate the stability-to-flow ratio.

    • 2.80 kN/mm
    • 3.25 kN/mm
    • 4.00 kN/mm
    • 4.50 kN/mm

11. A metal specimen under tensile loading has an engineering stress of 350 MPa at an engineering strain of 0.12. Calculate the true stress at this point.

    • 350 MPa
    • 392 MPa
    • 410 MPa
    • 450 MPa

12. A sample of coarse aggregate has a wet weight of 620 g and an oven-dry weight of 590 g. Calculate the moisture content of the aggregate.

    • 3.5%
    • 4.2%
    • 5.1%
    • 6.0%