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Science · Earth sciences
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45. Which of the following statements is NOT correct? (a) Rock Quality Designation (ROD) is a measure of the degree of fracturing of rock mass (b) ROD, core recovery and rate of penetration are all measures of rock strength. (c) Fracture orientation in a rock does not affect its Safe Bearing Pressure. (d) Shear strength of a rock is determined by its cohesion and internal friction. (e) Safe Bearing Pressure of weathered mudstone is about half of that of intact mudstone. Which of the following statements is NOT correct? (a) A walkover study precedes the desk study (b) The costs ofa site investigation are typically less than 5% of the total costs of a civil 46. engineering project (c) Trial pits and trenches are the cheapest method of shallow ground investigation. (d) The main stage of a site investigation typically involves soil testing in the laboratory (e) After the final report of a site investigation, there is a stage during excavation where potential changes of ground conditions are monitored 47. The position of buried leaking plastic barrels and the extent of resulting groundwater contamination would be best investigated using which two methods? (a) GPR survey and gravity survey (b) Magnetic survey and seismic refraction survey (c) Trial pits and groundwater sampling. d) Resistivity survey and GPR survey (e) Seismic refraction survey and GPR survey Page 17 of 18

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