251. The function of ballast in railaway tracks is to
252. A soil formation through which only seepage is possible, being partly permeable and capable of giving insignificant yield, is classified as
253. The return period for the annual maximum flood of a given magnitude is 8 years. The probability that this flood magnitude will be exceeded once during the next 5 years is
254. A foundation is considered as shallow if its depth is :
255. The type of surveying in which the curvature of the earth is taken into account is called
256. The stress-strain diagram for two materials A and B is shown below.
The following statements are made based on this diagram : Mateiral A is more brittle than material B.The ultimate strength of material B is more than that of A.
With reference to the above statements, which of the following applies ?
257. Base course is used in rigid pavements for
258. A reinforced concrete structure has to be constructed along a sea coast. The minimum grade of concrete to be used as per IS : 456-2000
259. The relationship between the length (l) and radius (r) of an ideal transition curve is given by
260. The width of expansion joint gap is 2.5 cm in a cement concrete pavement. The spacing between expansion joints for a maximum rise in temperature of 25°C is, (assuming coefficient of thermal expansion of concrete as 10 x 10-6 per degree C),
261. Coulomb's theory of earth pressure is based on :
262. For a fixed beam with span L, having plastic moment capacity of Mp, the ultimate central concentrated load will be
263. The group index of a soil subgrade is 7. The subgrade soil is rated as
264. Pipingin soil occurs when
265. Gold is .................. precious metal. (Put article wherever necessary)?
266. The span (s) to be loaded uniformly for maximum positive (upward) reaction at support P, as shown in the figure below, is (are)
267. Mechanical stabilization requires :
268. The disinfection efficiency of chlorine in water treatment
269. Chlorine is some times used in sewage treatment
270. The deflection of a cantilever beam at free end b applied with a moment M at the same point is :
271. A saturated clay stratum draining both at the top and bottom undergoes 50 percent consolidation in 16 years under an applied load. If an additional drainage layer were present at the middle of the clay stratum, 50 percent consolidation would occur in
272. Water flows at a rate of 10 m3/s in a rectangular channel 3 m wide. The critical depth of flow is
273. Coagulation-flocculation with alum is performed :
274. Blue baby disease (methaemoglobinemia) in children is caused by the presence of excess
275. Breakpoint chlorination of water involves addition of chlorine in an amount sufficient to: