Hydraulics & Geotechnical Engineering Exam Questions Actual Questions And Correctly Well Defined Answers.

#1. Which of the following states the law of buoyancy? - correct answer - Archimedes #2. A flow in which the velocity of the fluid at a particular fixed point does not change with times. - correct answer -steady flow #3. Which component of rock or soil is independent of interparticle friction? - correct answer -cohesion #4. A phenomenon in which the strength and stiffness of a soil is reduced by earthquake shaking or other rapid loading? - correct answer -liquefaction #5. A pile of sand keeps from spreading out like a fluid because the weight of the sand keeps the grains stuck together in their current arrangement, mostly out of static friction. This weight and pressure are called? - correct answer -effective stress #6. Which of the following is a soil component? - correct answer -minerals,organic materials,water,air (gas) #7. A practice or procedure used to assess the particle size distribution (also called gradation) of a granular material. The size distribution is often of critical importance to the way the material performs in use. - correct answer -sieve analysis #8. According to USCS, what do you call a soil grain size greater than 4.75 mm but less than 75 mm? - correct answer -gravel∶particles of rock that will pass a 3 inch (75mm) sieve and be retained on a No.4 (4.75mm) coarse∶ - correct answer passes 3 inch (75mm) sieve and retained on 3/4 inch (19mm) sieve fine∶ - correct answer passes 3/4 inch (19mm) sieve and retained on No.4 (4.75mm) sieve boulders∶ - correct answer particles of rock that will not pass a 12 inch (300mm) square opening cobble∶ - correct answer particles of rock that will pass a 12 inch (300mm) square opening and be retained on a 3 inch (75mm) #9. Which of the following affect the settlement of a footing? - correct answer -location of GWT,depth of backfill,plasticity of soil #10. Section 302.4.1 NSCP, steepness of the fill (above natural ground) shall not exceed: - correct answer 1V∶2H #11. Section 302.2.2 NSCP, steepness of the cut shall not exceed: - correct answer 1V∶2H #12. The elastic tendency of liquids which makes them acquire the least surface area possible. It is responsible, for example, when an object or insect such as mosquitos that is denser water is able to float or run along the water surface. - correct answer -surface tension #13. The ratio between the volume of water and the volume of voids: - correct answer -degree of saturation #14. The ratio between the volume of voids and the volume of soil mass: - correct answer -porosity #15. The ratio between the weight of water and the weight of solid particles: - correct answer -moisture content #16. According to USCS, what do you call a soil grain with grain size greater than 4.75 mm but less than 75 mm - correct answer gravel #17. When the path lines of the individual particles of a flowing liquid are irregular curves and continually cross each other and form a complicated network, the flow is called - correct answer turbulent #18. A line joining the points of the highest elevation of water in a series of vertical open pipes rising from a pipeline in which water flows under a pressure is referred to as - correct answer hydraulic gradient #19. A pressure surge or wave caused when a fluid in motion is forced to stop or change direction suddenly (momentum change) is referred to in hydraulics as - correct answer water hammer #20. At what temperature, Celsius, at which water has the highest density - correct answer 4° C #21. The pressure exerted onto a liquid is transmitted equally and undiminished to all portions of the liquid. This principle in fluid mechanics is known as - correct answer Pascals #22. In any stream flowing steadily without friction the total energy contains is the same at every point in its path of flow. This principle is attributed to - correct answer bernoulli #23. Largest grain size that may pass through No. 200 - correct answer 0.074 mm #24. Atterberg limit test is one on aggregates that pass through what sieve size - correct answer No.40 #25. Water Code of the Philippines - correct answer PD.No.1067 #26. Type of fluid which has no friction. It is also referred as inviscid fluid. - correct answer ideal fluid #27. It measures the substance's resistance to uniform compression. It is defined as the ration of infinitesimal pressure increase to the resulting relative decrease of the volume - correct answer bulk modulus of elasticity #28. The relative decrease of the volume of a system with increasing pressure in an isothermal process - correct answer coefficient of compressability #29. It is the grain size corresponding to 10 percent passing on a grain-size distribution curve - correct answer hazen's effective size #30. Provides a means of describing the degree and kind of cohesion and adhesion between the soil particles as related to the resistance of the soil to deform or rupture - correct answer soil consistence #31. It is used to determine the grain size distribution of coarse-grained soil - correct answer sieve analysis #32. It is the test used to determine the grain size distribution of the soils passing the No. 200 sieve - correct answer hydrometer analysis #33. `soil transported by running water and deposited along streams - correct answer alluvial soils marine soils - correct answer -soils formed by deposition in the seas aeolian soils - correct answer -soils transported and deposited by wind lacustrine soils - correct answer -soils formed by deposition in quiet lakes #34. The process of changing the composition and texture of rocks without melting, by heat and pressure - correct answer metamorphism #35. The breakdown of rocks by the means of rainfall, extreme temperature, and biological activity - correct answer weathering #36. In accordance with the USCS of soils, which are considered coarse grained if the passing thru No. 200 sieve is less than __ - correct answer 50 #37. A process by which water-saturates soil sediment temporarily loss strength and acts as a fluid - correct answer liquefaction #38. Flake shaped microscopic and submicroscopic particles of mica and other materials and are generally defined as particles smaller than o.002 mm - correct answer clays #39. A type of soil that has a combination of two or more graded fractions - correct answer gap graded soil #40. An uncemented aggregate of mineral grains and decayed organic matter (solid particles) with liquid and gas in the empty spaces between the particles is known as - correct answer soil