GATE Exam for Civil Engineering Online Test 1. Sewage treatment in an oxidation pond is accomplished primarily by : bacterial oxidation only alga-bacterial symbiosis algal photosynthesis only chemical oxidation only 2. Un-factored maximum bending moments at a section of a reinforced concrete beam resulting from a frame analysis are 50, 80, 120 and 180 kNm under dead, live, wind and earthquake loads respectively. The design moment (kNm) as per IS: 456-2000 for the limit state of collapse (flexure) is 450 345 195 372 3. Presence of ifluoride in water greater than permissible level of 1.5 mg/l causes methemoglobinemia dental fluorosis cardiovascular disease hepatitis 4. The cylinder strength of the concrete is less than the cube strength because of the difference in the slendeness ratio of the specimens the friction between the concrete specimens and the steel plate of the testing machine the difference in the shape of the cross section of the specimens the cubes are tested without capping but the cylinders are tested with capping 5. Flexible pavements derive stability primarily from : cohesion alone the binding power of bituminous materials the flexural strength of the surface course aggregate interlock, particle friction and cohesion 6. The group efficiency of a pile group will be always greater than 100% may be less than 100% or more than 100% will be always less than 100% will be more than 100% for pile groups in cohensionless soils and less than 100% for those in cohesive soils 7. In a reinforced concrete beam-column, the increase in the flexural strength along with the increase in the axial strength occurs beyond the elastic limit of the material when the yield of the tension reinforcement governs the strength when the crushing of the concrete in the compression zone governs the strength never 8. The microbial quality of treated piped water supplies is monitored by Coliform MPN test Plate count of heterotrophic bacteria Microscopic examination Identification of all pathogens 9. Presence of excess nitrates in river water indicates : past pollution of water with sewage recent pollution of water with sewage immediate pollution of water with sewage no pollution of water with sewage 10. In reinforced concrete, pedestal is defined as compression member, whose effective length does not exceed its least dimension by 8 times 3 times 12 times 16 times 11. The percentage error in the computed discharge over a triangular notch corresponding to an error of 1% in the measurement of the head over the notch, would be 1.0 1.5 2.0 2.5 12. A single rapid test to determine the pollu-tional status of river water is : chemical oxygen demand total organic solids biochemical oxygen demand dissolved oxygen 13. The values of liquid limit and plasticity index for soils having common geological origin in a rectricted locality usually define A straight line parallel to A-line A straight line perpendicular to A-line Points may be anywhere in the plasticity chart A zone above A-line 14. The drop manholes are provided in a sewerage system when there is change from gravity system to pressure system change in alignment of sewer line change in the elevation of ground level change in size of sewers 15. In a compaction test, as the compaction effort is increased, the optimum moisture content increases decreases remains same increases first and thereafter decreases 16. The reaction time for calculation of stopping distance may be assumed as 5 secs 2.5 secs 0.5 secs 10.0 secs 17. Vane tester is normally used for determining in situ shear strength of : stiff clays soft clays sand gravel 18. The characteristic strength of concrete is defined as that compressive strength below which not more than 2% of results fall 5% of results fall 10% of results fall None of these 19. The peak discharge of the instantaneous unit hydrograph of a basin, when compared to the peak discharge of a 4-hour unit hydrograph of that basin, would be equal lesser greater equal or lesser 20. In IS : 800 (1984) the permissible compressive stress in column is based on : Secant formula Euler formula Rankine-Gordan formula Rankine-Merchant formula Loading … Question 1 of 20
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